Many times just doing an update-grub may find Windows and add it to grub, but a lot of times it won't.
Create Windows in a custom grub entry like below:
sudo vi /etc/grub.d/40_custom
menuentry "Windows 10" {
set root='(hd0,0)'
chainloader + 1
}
Change Windows 10 to whatever you want to call it. For example if it was for Windows 11 you'd probably want to ca........
This guide assumes you have a working Postfix server and want it to sign with DKIM.
There are a few things we have to understand to make all of this work though, which require you to be familiar with DNS as well.
1.) Install OpenDKIM
apt install opendkim
systemctl enable opendkim
2.) Edit /etc/opendkim.conf
Syslog yes
SyslogSuccess yes
Mode&nbs........
apt install tftpd-hpa
#change TFTP_ADDRESS to by setting address to 192.168.1.1:69 or the IP you need, otherwise it will listen on all IPs and interfaces which could be a security risk.
# edit /etc/default/tftpd-hpa
TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/srv/tftp"
TFTP_ADDRESS="192.168.1.1:69"
TFTP_OPTIONS="--secure"........
This sometimes happens when trying to install the EFIversion of grub to a device when you are booted into Legacy/MBR mode. It doesn't seem to occur on all machines, but some and seems somewhat BIOS dependent.
grub-install --target=x86_64-efi /dev/sda
Installing for x86_64-efi platform.
grub-install.real: warning: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
grub-install.real: warning: Couldn't find physica........
This can break things easily in remove environments where it was normally easy to convert a normal eth0 to a bridge under br0, and that bridge would normally have the same MAC address by default, which is desirable for most situations.
In Debian 11 this is different for some reason now.
https://unix.stackexchange.com/questions/681013/bridge-gets-random-mac-........
The error below can be caused by a gateway that is unpingable:
docker swarm join --token SWMTKN-1-1kogg8da68gtb1j7ezaddowyy9s0an5s9tue758o20k18liskw-5h3f61hrrmv3u6agshvbtcklf 172.16.1.80:2377
Error response from daemon: manager stopped: can't initialize raft node: rpc error: code = Unknown desc = could not connect to prospective new cluster member using its advertised address: rpc error: code = DeadlineExceeded desc = context deadline exceeded........
You can do a static lease that is tied to the MAC address but what a lot of users prefer is that they come into the office or lab the next day and that their device gets assigned the same IP address (if possible).
As we can see in the dhcpd logs that there is threshold that is defaulted as we'll show later. Whatever the threshold is set at, if the lease is younger than the threshold, it will keep the same lease. In other words, if the device goes to sleep or is powered off........
This seems to happen in many different drivers but it happened more often in newer versions such as 530 vs 525.
Then nvidia-modeset goes to 100%
There are many reports of this appearing since driver 4.70 and I can confirm I've seen this in various machines.
https://forums.de........
Sometimes users take their removal drives and unplug and replug them to test what happens during the failure of a disk. However, this breaks things quite badly due to the /dev/mapper in LUKS not coming back online due to it not being closed.
In other words, generally with non-encrypted drives the process is smooth but when encrypted you may want to follow a strategy like this:
We can see below that both disks are unavailable as they were physically remov........
Even today we see a lot of servers that have different services and ports open for rpc and this creates not only potential inward vulnerabilities but perhaps more common, the abuse of your network resources in reflective rpc queries.
To stop this problem, you should disable and remove all services relating to rpc or at least block all relevant ports for the service.
Surprisingly, there are still some providers and OS installs in Linux that install these services and leave them........
Have you ever tried mounting a partition that you exists but you get this error?
mount: /mnt: can't read superblock on /dev/sda1.
The superblock in this example was bad because the physical disk had corruption and bad blocks/sectors. However, the data was generally accessible and you can always try this trick below (with caution and no warranty).
This is specifically for filesystems that place superblocks in multiple locations, which........
Nov 15 17:00:49 rttbox kernel: overlayfs: filesystem on '/var/lib/docker/overlay2/check-overlayfs-support450709549/upper' not supported as upperdir
Nov 15 17:00:49 rttbox dockerd[93755]: failed to start daemon: error initializing graphdriver: driver not supported
The above error is often/normally caused because you are trying to run docker out of an unsuitable directory/filesystem. For example if you try to place docker's data inside an existing overl........
This is a weird issue as sometimes when upgrading or even migrating, this could happen and the reason is simple but maybe not 100% obvious at first.
You will find that your GUIdoesn't load and most services fail to start, even logind
Here are some errors you may see:
Mar 13 22:22:23 rttbox systemd-logind[2892]: Failed to connect to system bus: No such file or directory
Mar 13 22:22:23 rttbox systemd-logind........
Are you getting this error when trying to connect to a site/domain/service and then you checked your router/nameserver's logs to see what's wrong?
You may see something like this:
named[3025898]: REFUSED unexpected RCODE resolving
This is not usually an error with named or bind, at least not on your end but NORMALLY this is an issue with the remote nameserver.
A lot of times this is a misconfigured remote nameserver. A classi........
If you have du, you may want to check your bill, as you can read about a longstanding issue with fraudulent charges showing up and many users claiming they did not subscribe or solicit those offers.
These don't normally show up on new accounts, but they seem to target established users and maybe even users they suspect are not watching their phone or bills, while they are on vacation.
These charges can frighteningly happen with 0 interaction from the user despite what........
A lot of companies are unsure which solution to choose and many may not be aware of Docker Swarm as an alternative to Kubernetes. One thing that many Sysadmins find is that Docker Swarm is simply easier, quicker to setup and maintain by far than Kubernetes.........
When Is It Time to Leave Your VPS, VDS, and Dedicated Server Provider?
Choosing the right hosting solution—be it Virtu........
In today’s digital landscape, finding a reliable and secure Virtual Private Server (VPS) or Virtual Dedicated Server (VDS) goes beyond just comparing specs and prices. With increasing concerns over data privacy, security breaches, and government surveillance, the wisdom of choosing your VPS/VDS provider based on juri........
First we need a few extra packages:
apt update
apt install -y adduser libfontconfig1 musl sudo
wget https://dl.grafana.com/enterprise/release/grafana-enterprise_10.3.1_amd64.deb
Install / Enable Grafana
dpkg -i grafana-enterprise_10.3.1_amd64.deb
dpkg -i grafana-enterprise_10.3.1_amd64.deb
(Reading database ... 44309 files and directories currently installed.)
Preparin........
This is for the situation that you're doing other things that may conflict or have your own custom rules and ufw keeps overriding iptables.
A lot of guides don't work, and even ufw reset does not work, because it still leaves the old ufw chains.
Here is what works to disable ufw completely
systemctl stop ufw
systemctl disable ufw
ufw disable
rm -f /et........
During a migration or other custom setup, it's possible you don't have a $HOME/Desktop and as a result the config file that controls this is set to just use your $HOME directory.
This is controlled in the file: $HOME/.config/user-dirs.dirs
As we can see below, Desktop, Downloads, Music and Pictures are set to $HOME. We can edit any of these as we like.
# This file is written by xdg-user-dirs-update
# If you want........
Normally syntax highlighting is the default behavior.
You can enable it manually by hitting :syntax on
But normally you'll have this error because of the missing package.
E319: Sorry, the command is not available in this version
Solution install the vim-gui-common package:
apt install vim-gui-common
After that you should find that the code is highli........
find /usr/share/zoneinfo/|sed s#"/usr/share/zoneinfo/"##g|grep "/"|grep -v posix|grep -v ^"Etc/"|grep -v ^right|grep -v ^"SystemV"
Africa/Addis_Ababa
Africa/Abidjan
Africa/Blantyre
Africa/Lusaka
Africa/Casablanca
Africa/Libreville
Africa/Asmara
Africa/Bujumbura
Africa/Dakar
Africa/Lagos
Africa/Malabo
Africa/Harare
Africa/Kigali........
If you are using a hypervisor to test Proxmox (eg. Vbox) then changing the video card/display adapter can fix it.
For example VboxSVGA causes the issue but switching to VMSVGA fixes it.
For example VboxSVGA causes the issue but switching to VMSVGA fixes it.
........
configure.ac:75: error: possibly undefined macro: AC_PROG_LIBTOOL
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1
make: *** [/software/pixman/configure] Error 1
make: *** Deleting file `/software/pixman/configure'
yum install libtool........
Step 1.) Upgrade to Debian 11 first
The process to go to Debian 12 is not as smooth as 11, when trying to upgrade from Debian 10. In fact, it doesn't work directly, so you'll first need to follow this guide to update to Debian 11, reboot and come back here if successful.
Step 2.) Update sources.list
Update your /etc/apt/sources.list like this:
deb http://........
If you are running a local DNS server like named/bind and don't want to use the ISPsupplied DNS servers that are announced via a DHCP request (using dhclient) then the solution is simple.
The reason should be obvious, but normally running your own DNS server will provide a more reliable, and fast DNS response and you won't have to worry about filtering as much (unless your upstream filters or proxies outgoing DNS requests).
Edit /etc/dhcp/dhclient.conf........
If you have swarm services and dockerd is creating a high load even with the containers just being idle, the easiest solution is to upgrade to a newer docker version.
For example an identical config of 3 nodes, with Redis 5 with 30 replicas produces a load of about 1.45 in Debian 10 with Docker18.09.1
If I create the same setup on Debian 11, with Docker 20.10.5+dfsg1 then the CPU usage is low.
One other difference I wondered is the kernel. In my test setup........
If you get this error, it is often because you have configured Apache with modules that weren't actually installed. Eg. you try to load the PHPmodule but didn't actually install the apache2 php module, so the server can't start. In general, this error can often be caused by issues with problematic modules and/or Apache being configured for modules that have not actually be installed (eg. libapache2-mod-php) is missing.
The above results in this less than obv........
This should work for most console ports of other manufacturers too. It is a quick and simple method for emegencies or deploying a few appliances/devices in a non-standard environment or small environment.
However, if this is a route thing, or the equipment is not physically close to you, it would be best to use some sort of "Terminal" server which is an IP connected switch with several serial ports built-in for this purpose. Normally they accessible by web/........
The issue is that Docker images are stripped down, so many tools and even python3 is missing, so you'll have to build or update the actual image yourself.
I assume you have started an image with something like this and that you have the Nvidia Toolkit installed (assuming you are using GPUs). If you're not using nvidia just remove --runtime=nvidia --gpus all.
docker run -it --runtime=nvidia --gpus all ubuntu bash
These works for most images li........
Welcome to our in-depth guide on configuring NVIDIA GPUs with Docker on Ubuntu. This post is tailored for developers, data scientists, and IT professionals who are looking to leverage the power of NVIDIA's GPU acceleration within Docker containers.
Whether you're working on machine lea........
You'll notice that /etc/resolv.conf contains dire warners on most Linux Desktops.
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "resolvectl status" to see details about the uplink DNS servers
# currently in use........
Just in case, it is reocmmended to backup the original contents of the directory (especially your home dir) before proceeding.
Setup ecryptfs
Run this command: ecryptfs-setup-private
It will ask you for your login password, this is so that when you login, everything is automatically decrypted by using a passphrase that is wrapped with your login.
You can hit enter and leave things blank for an autogenerated passphrase (for mounting) or you can en........
Just hit **# on the keypad and the CIPCwill enable the button in settings for a factory reset. Sometimes the phone may run into issues or may be unable to register to another tftp server (eg. another CME or CUCM server) due to a bug or maybe due to the security settings tying it to a specific server.
Step 1 - Click Settings
Step 2 - Hit "**#"........
By default in most newer Windows installs, you will not be able to download files from "Internet" sites and you'll get this error "Your security settings do not allow for this file to be downloaded."
Solution to Enable Downloads in IE Internet Explorer
1.) Go to Settings (button) -> Internet options -> Security (tab)
2.) Click "Internet" and then the "Custom Level" button.
3.) Find the following section and set D........
How to check what kernel version you have/currently running?
uname -rm
5.4.0-91-generic x86_64
The above shows us that we are running 5.4.0-91-generic on the x86_64 architecture.
The safest way is to stick with the same flavor eg if you're on generic, and say on kernel 5.4.0 then it makes sense to follow what is below. However, if you are migrating or dual booting between newer hardware (eg. you got a........
The passwords are stored in the following locations on Unix/Linux:
The directory is usually inside your home like this:
~/.mozilla/firefox
logins.json contains the locations, username and password
key*.db (usually then name could be key3.db or key4.db)
Without the key file you will not see any passwords in Firefox as it is required to in order to decrypt the contents of logins.json........
So you started a process or other important task that is remote but it is in the foreground and on a pts. This means if you background with Ctrl + Z or otherwise logout or get disconnected that the process will be stopped.
Here is how you can solve the problem:
1.) Hit Ctrl + Z to suspend the process.
2.) Type bg to restore the process into the background. If you do a ps aux on the process you will see it was restored with the & at the end, which puts........
We could always disable swap but this would normally be a bad idea unless you have an incredible amount of RAM and a workload that will never exceed it. However, for live/containerized and high performance environments it could be desirable.
Another middle ground may be to set swappiness to a lower number.
You may also want to clear your kernel's cache, which could be eating up RAM unnecessarily by c........
request_module: runaway loop modprobe binfmt-464c Kernel panic - not syncing: No init found Pid: 1, comm: swapper/0 Not tainted
This is usually caused by a mismatch in architecture and happens frequently in development environments.
Here is a example of what caused this issue:
Your binaries are based on one architecture
Your kernel was compiled with another architecture.
Why does this happe........
By default if you create a private key for SSH, it will create something like .ssh/id_rsa
Linux will always search for and offer this key when connecting to servers.
If you put extra keys in your .ssh directory like id_rsa_realtechtalk.com, they will be ignored by default and NOT used or offered (you can verify this with ssh -v) and see it is not being offered.
Here is how you add the extra SSH keys so they are all offered:
#this gives........
In a lot of distros like Debian, ecryptfs will mount itself in /home/yourusername/Private
This is controlled by Private.mnt which may contain the mount path like this:
/home/yourusername/Private
Change the default mount location of ecryptfs by modifying this file:
home/.ecryptfs/yourusername/.ecryptfs/Private.mnt
After you unmount and relogin, you should find ecryptfs is now mo........
Getting this error "bash: apt-add-repository: command not found"?
You need to install the software-properties-common to solve the error:
sudo apt-get install software-properties-common........
A lot of developers want to go to 3.11 because of the speed improvements, but most distros never have the latest Python version.
Using the deadsnakes third party repo is the easiest way aside from compiling it yourself (which is safer and recommended):
Step 1 - Add the repo
apt-add-repository ppa:deadsnakes/ppa
If you get an error about requests then install it:........
Check your initramfs if it's missing /dev/null or /dev/console, this is likely the reason.
If you want all actual devices to be created you could also enable devtmpfs in your kernel (.config) and mount like this during init:
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
mount -t devtmpfs none /dev
But note devtmpfs will not create /dev/null or /dev/console for........
haproxy is one of the best known and widely used Open Source load balancers out there and a strong competitor to nginx.
haproxy is used by many large sites per Wikipedia:
HAProxy is used by a number of high-profile websites including GoDaddy, GitHub,........
This is a weird issue in Mint Ubuntu gnome that I've only seen on one system. It may happen in your terminal or your browser but one program will just refuse to allow input from the keyboard. I am not sure if it's some weird fluke on a strange keyboard by perhaps accidentally hitting a weird key combination.
In some windows the keyboard gets weird and only / and Esc seem to work.
/ brings up quick find and sometimes Esc will close it........
If you are installing ta-lib for Python and get this error then you can normally solve it by manually getting the ta-lib source files and compiling.
tar -zxvf ta-lib-0.4.0-src.tar.gz
cd ta-lib;./configure;make;make install
Collecting ta-lib
Downloading https://files.pythonhosted.org/packages/39/6f/6acaee2eac6afb2cc6a2adcb294080577f9983fbd2726395b9047c4e13ec/TA-Lib-0.4.26.tar.gz (272kB)
&nbs........
This has been a tried and true method for Windows because it is finicky with hardware changes without a reinstall (eg BSOD on boot is what happens 9/10 times unless you move to the same hardwar). Surprisingly, if you use a QEMU VM and do a standard install, it has worked in every system I've thrown the drive in afterwards.
So the play is this, use a USB SSD, physical SATA drive plugged internally or for convenience, you could use a SATA to USB adapter on another computer to perf........
Be very careful about what filename you specify in dhcpd.conf if you get an error like this:
NBP filesize is 0 Bytes PXE-E23:Client received TFTP error from server.
If you specify "BOOTx64.efi" then the file had better not be called "BOOTx64.EFI" as it is case sensitive. It's really a case of th........
This seems to have changed for RHEL 8 where a normal dracut to update your initramfs creates a system that only boots for the running kernel. For example if you have Kernel 5 and then chroot into a RHEL 8 variant which uses kernel 4.18, and run dracut, it seems that by default the system will be unbootable.
It is also the case that if you move your RAID array or drives to another server that it will be unbootable, because dracut seems to only include modules needed for the curre........
Virtualbox is a very powerful tool, but for some use cases it is less than optimal.
Say you are in a work, lab or other environment where you are not alone on the physical network and there could be overlap of IPs, but you need all of your VMs to be contactable from your host, VMs need to communicate with each other, and VMs need internet.
NAT Network will give you VM to VM communication and internet, however, it is buggy and unstable. It also doesn't allow host to VM co........
In this example we install debian 10 with --variant=minbase which gives us a minimal/tiny install. Don't use variant if you want the full size install.
mkdir /tmp/deb10files
debootstrap --variant=minbase buster /tmp/deb10files/
Did you get an error?
debootstrap --variant=minbase buster /home/theuser/VMs/deb10files/
You'll get this error if you make a directory in your home........
You can read lots of posts about this issue but there is not much information about why this is the case or how grub determines the root= device name. Some even suggest modifying grub.cfg manually which is a disaster as the next kernel update will cause grub to revert back to the device name.
For most people this won't be an issue but those using template system, automated deployments and working in embedded may run into this issue with custom embedded and created minimal kernel........
This can be a real pain when automating things and you do an apt install and some packages ask a lot of questions.
Make sure you set this variable when running:
DEBIAN_FRONTEND=noninteractive
Remember as well that if chrooting you will want to run like this:
DEBIAN_FRONTEND=noninteractive apt install -y yourpackagename
........
Remember that control connections are established on port 1723 and then actual data is transferred over GRE protocol 47.
If you have a NAT setup this will work without special forwarding or accepting of GRE packets (normally if you are not blocking outgoing connections and accepting established and related connections).
The below two commands will get things going so PPTP and GRE work
We first load the ip_nat_pptp module which allows PPTP to work with........
Have you checked your router/firewall logs and disconcertingly see connections to an unknown IP207.246.119.209:3478 from your Grandstream VOIPphones?
You're not alone and the Grandstream forums have discussed this issue.
However, even their own staff d........
So say you happen to have 2 NICs of the exact same chipset, they will generally show up as the same name, with possibly a different revision in lspci. Normally this is not an issue if you have a server with 4 NICs, generally the eth0 to eth3 appears from left to the right (or right to left on some vendors) so it doesn't take much figuring out.
Generally if you have different chipsets for different NICs, it should be easy to know which one is eth0 or the first NIC in the OS.........
If you find your NAT Network is not working properly, the first thing you may want to do is list the networks, check their status and make sure the Network is actually started and configured as you expect (eg. is DHCP on and enabled?).
This is a long known, unresolved bug that seems to affect Version 6 randomly and disportionately on especially Mint 20/Ubuntu 18.
https://www.virtualbox.org/ticket/1474........
Are you new to the company, datacenter or a third party who is responsible for deploying a fleet of servers from scratch.
The first step is to normally login to the KVM so you can perhaps manually reinstall, PXE boot the Cloud Image or reimage/reinstall an OS but you need access to the KVM/IP or what Dell calls iDRAC.
It's common that you may have forgotten this information or that another employee or colleague has changed the info and did not tell you, that they have left the........
Do you have access to some old Tesla GPUs and want to try them at home in your Desktop or old Server? Some people have wanted to try these units for gaming but keep in mind they have no video out port, they were only meant for AI applications such as Deep Learning.
The easiest way by far is to choose an AIservice that has everything ready to go, perhaps with a bunch of Docker or Kubernetes containers. This can be done with Cloud services like Google, Amazon and many........
Later versions of ls try to be helpful and smart to prevent errors in dealing with files with spaces that were tradtionally a pain.
However if you need the raw/real filenames, this can break scripts or if you are pasting into a csv etc....
How do you make ls not add the quotes?
Add the capital "-N" switch
ls -N
You could also add an alias to make it more permanent
Do this to add it to ~/........
This is an ongoing issue even with the latest Thunderbird 102.x where attachments downloaded via IMAP just won't save or will be corrupt which is a huge interruption to workflow or if you come back later to find out the file you thought you saved is invalid/corrupt and you have perhaps deleted the e-mail.
How to solve the Thunderbird filesize attachment issue?
1. Click on "Settings". then go to "General".
2. Scroll to the bottom to find "Conf........
If you are converting a generic wifi IP camera to ethernet, it may not be that simple as many are default hard coded to a static IP of 192.168.1.168 and login info admin/admin.
From there you can login to the camera and assign it to DHCP by going to http://192.168.1.168
For security these cameras +DVR should be on a separate untagged VLAN or if possible a physically isolated non-internet connected switch/network.
The reference below is applicable to many of the r........
The easiest way for the current running kernel is:
update-initramfs -u -k `uname -r`
You could change -k to a specific kernel name if for some reason the current is not running (eg. if you are chrooted or in recovery mode).
If you want to update all kernels then use "-k all"
update-initramfs -k all -u
update-initramfs: Generating /boot/initrd.img-5.4.0-162-generic........
Sometimes due to your BIOS/EFI you may find that you have chosen "Energy Efficient" for your CPU which may effectively disable turbo mode. This is because "Energy Efficient" will often restrict or throttle your CPU to the base speed. This can impact nearly any CPU such as Intel's, AMDs, Opteron, Xeon etc...
This is of course frustrating, for example if you have a CPU that is 2.0GHz base speed but turbo to 2.5GHz, you will never hit more than 2GHz.........
Docker adds iptables rules that break a lot of things including MASQUERADE or anything that needs the FORWARD table. If NAT is not working after Docker installation, it is probably because it set the iptables FORWARD policy to DROP.
This may also make you think that your br0 or bridge is not working, but it's likely just due to what we'll mention later on below, that, Docker probably set your FORWARD chain to default DROP all packets, so nothing on your bridge ever makes it out........
By default it uses raw .avi which takes a lot of space and will not play on a lot of systems.
It's best to change the codec to something like MP4.
Step 1.) File -> Preferences -> Screencast in Kazam
Step 2. ) Change Record With: to H264 (MP4)
After that you'll........
Router#show license
Index 1 Feature: ipbasek9
Period left: Life time
License Type: Permanent
License State: Active, In Use
License Count: Non-Counted
Lic........
Solution for python pip3 not working anymore
from pip._internal.cli.main import main
File "/usr/local/lib/python3.5/dist-packages/pip/_internal/cli/main.py", line 60
sys.stderr.write(f"ERROR: {exc}")
wget https://bootstrap.pypa.io/pip/3.5/get-pip.py
python3 get-pip.py
DEPRECATION: Python 3.5 reached the end of its life on September 13th, 20........
pip3 install requests
Traceback (most recent call last):
File "/home/user/.local/bin/pip3", line 7, in
from pip._internal.cli.main import main
ModuleNotFoundError: No module named 'pip._internal'
As a quick and temp fix call the OS installed python and not the user .local/bin installed pip3
/usr/bin/pip3 install requests
Collecting requests
Cache e........
You probably didn't do an "update-grub" and grub no longer has any proper menu entries, but before you can fix it let's try to get grub booting anyway.
If you get this lovely black grub screen here's how you can get things booting.
In my case I have a gpt partition with partition 1 and 2. Partion 1 is just my EFI / ESPand partion 2 /dev/sda2 is my root which includes /boot.
You will have to adjust this if you had a separate /boot partition.........
1.) Make sure your conf register is 0x2102
Do show version and at the very end of the output you will see the Configuration register.
show version
Configuration register is 0x2102
If the config register is not 0x2102 then enter this command:
r1#configure terminal
r1(config)#config-register 0x2102
r1(config)#end
2.) Let's Erase the NVRAM/flash........
1.) Create your EFI/ESP Partition
If you happen to have some free space on the drive already then this is easy, just create a new partition of at least 100M.
The nice thing about the EFI spec is that it must just be in the first 2.2TB of space so for most users, it means you can simply resize the last partition(downsize it by 100M) and then add an EFI partition at the end.
For example if you had this partition scheme:
/dev/sda1 = /........
If you are in enable mode and make a typo, the router will treat it as a domain name and try to resolve it, and if it can't resolve it, you'll have to wait until it times out.
Here's how to solve the Translating domain server error in Cisco
Enter this in config mode:
no ip domain-lookup
Be sure to sav........
I've seen this bizarrely happen on a newly partitioned and custom installed Linux install, particularly if you did not properly unmount before rebooting.
You can find reports of it happening on various
How to fix the error: invalid arch-independent ELF magic.
You need to boot into Live/Rescue mode, chroot into your OS properly and then do a grub-install on each drive that nee........
If you are doing a custom deployment and image, make sure that when you rsync'd or tar'd that you didn't mess up the symlnk of /etc/mtab to /proc/self/mounts
ln --force -s /proc/self/mounts /etc/mtab
Will fix this........
This article about migrating to a CentOS 7 /8 RAID mdadm array has a lot of info but I wanted to focus specifically on what newer versions of CentOS 7 require to boot mdadm and what changes are necessary on CentOS 7.8+
CentOS 7 / 8 mdadm RAID booting requirements
This assumes you are chrooting into an existing install or using it to get a new deployment ready. However, these steps can........
Adding a default route is very simple with this command
Just replace 192.168.1.1 with the IPof your GW.
ip route add default via 192.168.1.1
How can you delete this default route if you messed it up?
It's just the opposite with "delete" instead of add
ip route del default via 192.168.1.1
This is the equivalent of the "route command's" route add default gw 192.168.1.1........
Just an FYI that the installer ignores your selection of Boot Loader, as it was intended for MBR/Legacy. The installer horribly, even when choosing "Something Else" and manually partitioning and creating an EFIin your install drive, will still install grub to the first EFI partition it finds, even if you are following a guide like this to avoid wiping out the M........
There are lots of wrong answers out there perhaps for much older versions of LibreOffice.
Tools -> Options
Then under LibreOffice ->Application Colors below.
Change the Viisted and Univisted link colors
Now you should h........
It may appear to be an Xorg or lightdm/gdm/mdm error but in reality for many users with this issue, it's a driver conflict and issue. I had a system that had two GPUs, an Intel and Nvidia GPU.
The only thing that got it working was to remove the nouveau driver and blacklist it so it never came back, then the Intel GPU works fine without these issues.
Solution
sudo rmmod nouveau
add nouveau/other driver to blacklist
edit th........
A quick fix is to run this command:
sudo brctl setageing br0 0
This causes the aging of the MAC address to time out immediately or in 0 seconds, which delete the entry frmo the FDB (Forwarding Database) and causes the error to go away. The default time is 300 seconds or 5 minutes.
You can also add it under your br0 definition like this in /etc/network/interfaces to make it permanent and automatic:
auto br........
NetworkManager is normally good for GUI users who may not be good with manually confguring devices, but if you are using things like bridging and bonding, it will often break things.
How To Disable NetworkManager
systemctl disable NetworkManager
Now that it's disabled you will need to stop NetworkManager. NetworkManager will still be running until you reboot next or manually stop it.
How To Stop NetworkManager
systemctl stop........
Here is how Ifixed it on a Mint/Ubuntu install
1.) First download the latest AMDGPU-Pro driver from here:
https://www.amd.com/en/support
Navigate to your relevant video card:
2.) Download the installer
One issue is that by default they give you a version for the latest version of........
I've encountered this after upgrading some Debian/Ubuntu/Mint based systems for no explicable reason, although there are some bug trackers on Ubuntu that document this: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1889509
The short end of the solution is that you need to properly reinstall grub.
1.) Boot from a LiveCD
2.) Mount your root / filesystem and don't forget to mo........
Usually LIbreoffice gets it right, but if it opens a normal English CSV as UTF-16 by default and shows Asian languages, you'll have ot manually open to fix it (don't double click the file from the File Manager).
Solution - Manually Open the File After Opening LibreOffice Calc
You'll see it is defaulting to UTF-16 which breaks everything.
........
One easy way is to use lspci -k like this:
sudo lspci -k|grep modules|sort -nr|uniq
Kernel modules: snd_hda_intel
Kernel modules: shpchp
Kernel modules: pata_acpi
Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
Kernel modules: mei_me
Kernel modules: lpc_ich
Kernel module........
If you get this error when trying to SSHto a device or machine and you never even got a password prompt:
Too many authentication failures
This means that either the remote side is configured for key auth only, OR your client side may be attempting to auth using mulitple keys, and that exceeds the amount of attempted authorizations on the remote ssh server.
If the issue is trying to auth too many times which ssh defaults to sending the keys to, you ca........
This error implies that there may be an issue with Xorg or maybe your NVIDIA GPU cannot start or initialize:
35 laptop kernel: [ 2031.857704] nvidia: loading out-of-tree module taints kernel.
35 laptop kernel: [ 2031.857724] nvidia: module license 'NVIDIA' taints kernel.
35 laptop kernel: [ 2031.857725] Disabling lock debugging due to kernel taint
35 laptop kernel: [ 2031.873280] nvidia: module verification failed: signature a........
If you get an error like this when installing the Nvidia drivers:
WARNING: Unable to determine the path to install the libglvnd EGL vendor library config files. Check that you have pkg-config and the libglvnd development libraries installed, or specify a path with --glvnd-egl-config-path.
Just install these packages: &nbs........
Linux Mint offers an easy and painless upgrade path through the last 3 versions, which means no more reinstalling to stay current with the latest version.
The only catch is that you need the latest of each version, so for 18, you need 18.3 before you can go to 19, and then 19.3 (or latest), until you go to 20. However, it's really a small price to pay and on the machines we've tested, the upgrade went seamlessly each time (although sometimes video drivers/custom kernel modules l........
ID3 2.4 can cause various MP3 players, especially on vehicles or even computers, not to play or at least not to display the ID3 tags.
In many cases though, since ID3 2.4 is much different than version 2.3, it will cause some players, especially in cars like Lexus not to play. Even on the computer, you may notice if you check the properties of the MP3 that it won't open or show any details (eg. frequency, bitrate and ID3 tags).
One symptom of this in a vehicle (eg. Leuxs,........
Bonding is an excellent way to get both increased redundancy and throughput. It is similar to the "Network Teaming" feature in Windows.
There are a few different modes but we will use mode 6, I think it's the best of both worlds, as it is not just a failover, but it provides round robin, so you will get redundancy and load balancing. So if you have a 1G single port, you will have a combined throughput of 4G at this point. Just bear in mind that the true thr........
If you are using mint, delete the preference that stops snap from installing (as it is required for lxc)
sudo rm /etc/apt/preferences.d/nosnap.pref
1. Install lxd:
sudo apt install lxd
Issues install lxd or errors? Click here
Debian at this time does not have lxd so you'll need to use snap:
sudo apt in........
This can be used on almost anything, since Gluster is a userspace tool, based on FUSE. This means that all Gluster appears as to any application is just a directory.
Applications don't need specific support for Gluster, so long as you can tell the application to use a certain directory for storage.
One application can be for redundant and scaled storage, including for within Docker and Kubernetes, LXC, Proxmox, OpenStack, etc or just your image/web/video files or even da........
This may be necessary if you have a VM or if for some reason you just want to be more efficient with your space and have the flexibility of changing your swap space at will.
What we mean is the ability to use a "swap file" or similar to the Windows "pagefile" that normally resides on the root or c: partition of Windows.
Here's all you have to do and then you to can have a single partiton with everything, including the swap file on the root partition if you........
This happens during an apt update and is related to an issue with sources.list, which is particularly troubling, if you are doing a "live-build".
P: Configuring file /etc/apt/sources.list
Hit:1 http://deb.debian.org/debian bullseye InRelease
Get:2 http://deb.debian.org/debian bullseye-updates InRelease [39.4 kB........
freshclam
ClamAV update process started at Sun Mar 20 00:30:50 2022
WARNING: Your ClamAV installation is OUTDATED!
WARNING: Local version: 0.100.3 Recommended version: 0.103.5
DON'T PANIC! Read https://www.clamav.net/documents/upgrading-clamav
main.cld is up to date (version: 62, sigs: 6647427, f-level: 90, builder: sigmgr)
WARNING: getpatch: Can't download daily-26337.cdiff from db.local.clamav.net
WARNING:........
(firefox:9562): LIBDBUSMENU-GLIB-WARNING **: Unable to get session bus: Failed to execute child process "dbus-launch" (No such file or directory)
ExceptionHandler::GenerateDump cloned child 9743
ExceptionHandler::WaitForContinueSignal waiting for continue signal...
ExceptionHandler::SendContinueSignalToChild sent continue signal to child
[Parent 9562, Gecko_IOThread] WARNING: pipe error (40): Connection reset by peer: file /build/firefox-EymEXX/fire........
Install procps and it will install the other packages you need:
apt install procps
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libgpm2 libncurses6 libprocps7 lsb-base psmisc
Suggested packages:
gpm
The following NEW packages will be ins........
There is a random bug that sometimes occurs with Vbox NAT mode DNS, although it has never happened in the past and Vbox was working fine until recently.
The symptom is that you can see it does get an IP+ DNS from the Vbox NAT DHCP.
Below we use resolvectl dns and verify the DNS server is set to 10.0.2.3 which is the DNS from Vbox NAT. We can ping it but it does not respond to any DNS requests when we use dig @10.0.2.3 realtechtalk.com........
The Best Docker Tutorial for Beginners
We quickly explain the basic Docker concepts and show you how to do the most common tasks from starting your first container, to making custom images, a Docker Swarm Cluster Tutorial, docker compose and Docker buildfiles.........
Have you been given a Zoom password that the meeting owner says is correct but it doesn't work anymore or never works?
If the meeting name says "Zoom Meeting" and it's not really named that (which most meetings are not), then the issue is usually that there is an initial password to be able to join, aside from the passcode. It basically means that Zoom has deauthenticated you randomly or maybe after X amount of uses, without clicking on the Join Meeting URL which contains a........
Why choose OpenVPN instead of a firewall appliance?
OpenVPN can be a reliable and easy replacement for traditional hardware or just be an additional tool that your company uses so that the firewall can focus on its job rather than acting as a VPNappliance at the same time.
When comparing OpenVPN with traditional firewal........
In our 2024 VPS Server/Cloud Buyer's Guide, we place the location of your VPS/hosting/server as one of the priorities that is often overlooked.
2024 Update - Datacent........
The key is that you need to know the passphrase to do it, if you don't know the password for the key then you can't remove the key since it cannot be decrypted.
ssh-keygen is the easiest method and openssl can be used to manually remove the key and output it to a new file, which you can then copy back over top of the encrypted file.
After that your public key authentication will work without any password prompt because it is no longer encrypted. Make sure you understand........
You might assume you have a bad drive or the SATA interface/cable is bad, or the power supply is bad/weak to the drive. These are all possible issues, but definitely check your SATA cable for "twisting". It is a big issue because until the error stops or times out, your system will not boot (in my case this was the case even though the drive with the issue was not part of the OS or booting process at all).
If you run an open rig that you move around often that ha........
How To Install Wazuh Server / Quickest Installation
Wazuh (forked from the well known OSSEC project) is a full SIEM (Security Information Event Management) that works extremely well with the platforms it natively supports as an "Agent", which allows you to do scans of everything such as all processes running, CVE vulnerability check, incident reporting etc...
Prerequisites:
A lot of issues with Wazuh seem to be caused by i........
If you get an error that you aren't in the sudoers file, this typically means that your user is not designated as an admin with sudo privileges.
In plain English, when it comes to some OS's like Debian including 10,11 etc.., by default the user is created without special privileges which is contrary to how Ubuntu/Mint handle the secondary user.
Let's check the sudoers file to see the problem.........
A lot of newer installs will automatically prohibit the root user from logging in directly, for security reasons or they will only allow key based access.
If you know what you are doing/don't care about security or have an incredibly secure password for testing, then you can enable it.
Edit this file: /etc/ssh/sshd_config
Find the following line: PermitRootLogin
Set it like this:
PermitRootLogin yes
Now rest........
1. Let's work from an environment where we can install Ansible on.
If you are using an older version of Linux based on Mint 18 or Ubuntu 16, you may want to get the PPA and get the latest version of Ansible that way:
sudo apt install gpg
sudo add-apt-repository ppa:ansible/ansible
sudo apt update........
This normally happens when you interrupt the install of Ceph:
pveceph install
update available package list
start installation
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
gdisk is already the newest version (1.0.6-1.1).
ceph-common is already the newest version (15.2.15-pve1).
ceph-fuse is already the newest version (15.2.15-pve1).
Some package........
Are you getting this error in Proxmox while trying to apt update or install Ceph?
apt update
Hit:1 http://security.debian.org bullseye-security InRelease
Err:2 https://enterprise.proxmox.com/debian/pve bullseye InRelease
401 Unauthorized [IP: 144.217.225.162 443]
Hit:3 http://ftp.hk.debian.org/debian bullseye InRelease ........
For a lot of reasons, it may be convenient to detach or attach live disks to a running VM without having to reboot it. Sure, you can use some network based storage, but when performance counts, attaching a new virtual disk will usually give you better throughput and lower latency in a quick testing situation.
This doesn't work, why not?
drive_add 0 if=virtio,file=/tmp/vm.qcow2,if=virtio,format=qcow2,id=rtt
Can't hot-ad........
Here is the scenario, you are using QEMU/KVM and are using something like the AC97 sound driver to pass the host audio to the guest via pulseaudio. This is useful because you can transparently pass your mic input from the host which means you can mute your microphone from the host, which prevents the guest from receiving any mic input even if unmuted.
Mute / Unmute Fix
This issue also seems to happen even if you press the mute button on the microphone and then unmute,........
Volume control will often stop working, if your sound server (normally pulseaudio) dies or restarts whether by itself or by you. The reason pulseaudio may need to be restarted is due to some sort of crash or other issue that prevents sound from working (normally restarting or doing a killall pulseaudio fixes things).
However, you will normally find at least in OS's like Ubuntu/Mint 16/18+ that you cannot control the volume whether adjusting the level, changing input/outputs and........
NAT Network, the VMs can communicate but your host cannot access them by default.
NAT VMs have internet but cannot communicate with each other.
Bridged is simple and allows full LAN access as if you had a physical machine plugged in but is often bad for testing, work or corporate environments and is not very portable when it comes to moving your VMs to other locations and networks.
Here is how you can use NAT Ne........
The Linux Mint team has disabled it by setting an apt preference, you can edit or just remove the file:
sudo apt install snapd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package snapd is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source........
Kubernetes Easy Beginners Architecture Guide
Kubernetes is known as container orchestration and we should start at explaining the container part of it.
A Container is what runs the actual application and based on an Image, and are more comparable to something like an LXC Container, Virtuozzo/OpenVZ using the Linux Kernel Namespaces feature. Containers run these images as independent, isolated operating environments under the OS's exist........
vi is very handy when doing a lot of config file editing and can save you time over using the mouse or using the x or delete keys to manually delete.
Solution:
If you don't want it to stop deleting when encountering things like - or _, then you want this:
d$
Or if you want it to stop on - and _ then use this:
dw
Remember both commands are in "non-input mode" so not when you're........
This assumes that you've already installed the relevant HWIC cards eg. Cisco Asynchronous Serial NIM
These are essentially cards that you install into your router, once installed you connect an Async cable to one of the ports on the card which normally gives you 8 console cables and are normally labelled 1 through 8.
You connect all of the cables to the devices you need (even non-Cisco devices) whether switches, routers or firewalls, they will usually work.
The real m........
There aren't too many simple guides that show you how to use commands to setup your USB or other drive as a normal bootable drive where you can easily boot custom kernels or whatever OS you would like.
1. Get the tools we need:
We install "syslinux" for MBR and "syslinux-efi" for EFI and "MBR" as we need a tool that embeds the actual MBR into our USB:
sudo apt install syslinux syslinux-efi mbr........
This was done on a 2900 but applies to all the switches of the same era.
Step 1 - Power Cycle and enter recovery mode
If you have physical access you can power cycle and hold the mode button down for 15 seconds. After that the SYS light will flash on the switch and you will see the following screenshot.
If you don't have physical access (eg. it is a datacenter swich over console only) then power cycle and hit "Ctrl+Pause/B........
A lot of older devices either support telnet or very old SSH keyx algorithms which are insecure and disabled by all newer/modern SSH clients for security reasons. However, sometimes you may be on a LAN via VPNor some other secured network or for whatever reason, absolutely, need to connect to this device and sometimes old/embedded devices may not be possible to update to a newer SSH server.
If you run into this you may be using a modern/newer SSH client and get thi........
It is common that you may get access to undocumented equipment and need to reset the password. This applies to many Cisco routers whether 2600, 2900, 3900 etc...
Cisco's Guide says to hit Ctrl +Pause/Break but if it doesn't work on some devices causing people to say "cisco password reset pause break does not work", you can see Cisco's alternative key combinations here:........
This seems to be an ongoing issue that is still reproducable in the latest Ubuntu Vbox 6.x.
The default NAT Network range is usually 10.0.2.0/24. If you change this range it does not seem to work properly.
Say we change the range to 10.50.1.0/24
If you get a new lease you will find that you get an IP from the old range but the default gateway is from the new range.
........
So you're trying to browse to a properly configured Samba share but you get this error:
Unable to mount location
Failed to retrieve share list from server: Connection timed out
If your config is right, it can be due to a protocol miss-match where your client has not enabled SMB3 but by default the other side (server) has enabled it.
You can test this out to see with the smbclient tool........
This is a common issue when e-mailing or uploading video files.
One note is that you should make the filesize you choose below about 20% smaller than you need. For example I took a 219MB video and told it to be 20M. The resulting file was still about 21.9M but it was OK when I said 18M and was barely below the 20M size.
ffmpeg is our friend here, just use this command:
Change the -fs 100Mto the size you want eg. 20M, 500M
Chan........
Usually if you get the grub boot loader and it doesn't show any boot options, it's because grub was not installed correctly and/or the partition that it is supposed to be on has changed or does not exist. It can also happen if you install Linux to one drive, but the boot loader to another by accident, whether EFI or MBR/Legacy mode.
You can normally fix your booting/bootloader/MBR/EFI it by chrooting into your root partition:
#become root
sudo su........
Just a quick note and warning is that if you are testing to see if EFIPXE booting works on a VM, MAKE SURE it actually works. For example Iinitially tested using my Distro's QEMU 2.5+dfsg-5ubuntu10.46 and ovmf BIOS firmware (OVMF supports EFI). However, I found on old versions of QEMU (like 2.5), EFIbooting with GRUB NEVER works so it may appear that you have made a mistake when everything is fine when you boot a physi........
Enable "cli" mode equivalent in JunOS
cli
Configure Mode
configure
So rather than going to the console on a Cisco switch and typing "enable" and then "conf t", the equivalent in JunOS is "cli" and "configure".
How Do You Apply Changes You've Made?
You can make all kinds of changes to the switch, but remember they are not........
Traditionally kernels were numbered starting from 0 but by default the "new style" of grub boot loading considers each subkernel item to be different so if you have 3 entries for 4.40-148 rather than counting for 1.
To get the expected behavior let's show this example and how we can boot it
We do a grep on menuentry in /boot/grub/grub.cfg to see all of the bootable kernels rather than scrolling through loads of extra entries we don't care about (thou........
It seems that QEMU/KVM's default PS2 mouse and keyboard doesn't work right in most cases. I have especially observed issues using Ctrl+C and Ctrl+V and in Linux you may see repeated key presses in the terminal and you will wonder why you copied something and it's not in the clipboard when you try to paste. The way to temporarily fix it is to press the key that is repeating once(works in Linux but not really in Windows).
Sometimes when moving your mouse it will also s........
If you get this error, you were probably compiling some sort of binary or package and got this error. It is normally solved by installing the "gettext"package.
On Debian/Ubuntu just apt-get it:
apt-get install gettext
After that you should be able to configure and make (compile) properly.........
Many people may not be aware that you can turn commodity hardware into a Mikrotik OS and there are various options which is "CHR" (Cloud Hosted Router) which is a VMimage meant for Virtualization only (seriously, I've tried to dd the image to a physical server and it just crashed as it does not contain any drivers for physical).
One note as well if you are trying to do a baremetal install you may get an error "Error Loading Operating System" or........
yum update
Loaded plugins: fastestmirror
Setting up Install Process
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/repo/arch combination/
removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base
You have mail in /var/spool/mail/root
........
The below appears at first to be a bad mirror DNS error, but if you've ruled that out you just need to clear your broken yum cache and things will be good.
yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.01link.hk
* extras: centos.01link.hk
* updates: centos.01link.hk
http://mirror.worria.com/centos/7.8.2003/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not........
I have a Canon MF642c and the scanner wouldn't work. I tried to use saned but it didn't work with the BJNPlike it did for some other Canon models.
Introducing sane-airscan with packages for the most common distributions: https://software.opensuse.org/download.html?project=home%3Apzz&package=sane-airscan
http........
Interestingly enough Windows 2000 works fine on QEMU 64-bit but you have to specify Pentium as your CPU otherwise it doesn't complete the install (it will not pass the detecting/setting up devices phase).
-vga cirrus is wise because it is supported by Windows 2000 and allows higher resolutions and 24-bit color.
-cpu Pentium emulates an old computer and is necessary for install to complete
-device rtl8139 is important as this oldschool Realtek 8139 NIC is supported by W........
It took a lot of fiddling to make a Huion Kamvas 13 Pro work in Linux but it simple once you know what to do. Don't bother searching as it is unlkely there is a guide out there that will actually make your tablet work.
It mainly comes down to the fact that the hid_uclogic kernel module is buggy or doesn't support MANYof these wacom based/Huion tablets properly.
What was happening with me is that Ihad the Kamvas 13 Huion setup as a secondary screen/monitor.&nb........
This normally works but if not use my mencoder solution if the output video does not play past the joined time.
the contents of list.txt need to look like this:
file somefile.mp4
file somefile2.mp4
then run ffmpeg
ffmpeg -f concat -i list.txt -c copy CME-2-router-dial-peer-final.mp4
The result is almost instant joining since there is no video processing since we are........
When you automount a drive in /etc/fstab even if it's not important like an external drive that you only use sometimes and is not required for booting, it will prevent a successfuly boot.
If you disable quiet mode for booting you will see something like below "A start job is running for dev-disk ...."
How do we fix an fstab entry from preventi........
A very common use case is that you don't want to waste time using a video editor that requires you to open it up and manually import the video clip and audio clip, then manually delete the old audio track and import the video and new audio. That's too much work and time since we don't want to go through the hassle.
ffmpeg is our solution, all we have to do is specify 3 variables and we're done!
-i Windows2019-Server-Noaudio.mp4 is our in........
qemu-img can convert many formats.
Here is an example of how to convert different images to different formats for QEMU-KVM
The example above converts a raw windows2019.img file from QEMU to a Virtualbox .vdi
qemu-img convert -f raw -Ovdi windows2019.img windows2019.vdi
-f raw = this means the format of the source image (instead of raw it could be vdi, vmdi, qcow2 etc..)........
The problem is that Linux uses UTC and Windows uses the local time from the RTC. This means whenever you boot Linux or Windows and then go back to the other OS, you will find your time is incorrect because of the two different clock modes fighting.
This results in very annoying issues when booting between the two because the clock is set based on the different standards once you boot (eg. Linux UTC by default and Windows RTC). For example it may cause issues with fsck and........
This tutorial will get your router up and running using emulation tools. In this case we'll be getting a Cisco C7206 (C7200 series) VXR router going which also supports SCCP VOIP services.
dynamips is the emulator itself and dynagen is the front-end tool that helps us control everything. It is used by tools such as gns3 and eve-ng.
Together the two tools (dynamips and dynagen) allow us to create and emulate REAL router........
The best way to avoid this problem is to understand how your BIOS is setup to boot.
Often newer machines will default to U(EFI) which is different than the traditional MBR/Legacy mode.
The problem is that this may not be apparent, often a BIOS Boot Menu will show a Legacy Boot Option and EFIOption without defining it.
A good example of this is if your USB is called "Kingston" you may see in your Boot Menu "Kingston" and also "Ubuntu"........
This happens to a lot of Nvidia users especially users of newer cards like the RTX series. If for example you are trying to boot and install Linux and you get a black and white grub2 screen instead of a nice graphical welcome installer, you probably suffer from this bug. It is normally followed by the user booting and finding they just have a blank/black screen.
Here is the quick flow of steps to fix it:
If you get a black grub scree........
Before you try to install and dual boot it is very important to understand the concept of "what boot mode your BIOS is in" and "what mode you booted the installer to".
Then follow the example of Linux Mint (but most Linux installers are very similar)to carefully understand WHERE you are installing your Boot Loader to whether that be MBR or EFI.
How Am IBooted?
First it's important to check your BIOS to see........
Cannot register the hard disk '/some/path/windows-marking.vdi' {f54def00-2252-43f5-9178-0998636cad61} because a hard disk '/other-path/windows-marking.vdi' with UUID {f54def00-2252-43f5-9178-0998636cad61} already exists.
Result Code:
NS_ERROR_INVALID_ARG (0x80070057)
Component:
VirtualBoxWrap
Interface:
IVirtualBox {0169423f-46b4-cde9-91af-1e9d5b6cd945}
Callee RC:
VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)........
It really seems limited in that it can mainly give you the things you would see on the physical unit such as load etc..
wget https://downloads.sourceforge.net/project/apcupsd/apcupsd%20-%20Stable/3.14.14/apcupsd-3.14.14.tar.gz?r=https%3A%2F%2Fsourceforge.net%2Fprojects%2Fapcupsd%2Ffiles%2Flatest%2Fdownload&ts=1598115866
tar -zxvf apcupsd-3.14.14.tar.gz
cd apcupsd-3.14.14
[root@somebox apcupsd-3.14.14]#
./conf........
If you've come here, don't be embarraassed, working in IT, this is the MOST common computer problem that almost everyone will encounter. The reason why I'm doing this post is because I've seen an increase from colleagues and admins having this problem and many times it's not even your fault. A common scenario is that someone acquires a new or used computer which they weren't given the password for. Fortunately Ihave a detailed list of all the options whether free or pa........
This seems to happen on most if not all Nvidia cards but the good news is that if you are using any of the Linux drivers and have the nvidia-settings tool installed it is just a simple command.
Solution:
nvidia-settings --assign CurrentMetaMode="nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }"
Enter the above command in your terminal and the screentearing will be fixed which is like enabling Tear Free on AMD cards.&........
-?????????? ? ? ? ? ? shadow
----------. 1 root root 748 Jul 10 04:35 shadow-
cat: shadow: Input/output error
If you see this you are probably in big trouble, it could be a physical error or if it's a VM image that it is corrupted due to a physical error on the underlying disk/array/NAS or it could a........
Is a mdadm check on your trusty software RAID array happening at the worst time and slowing down your server or NAS?
cat /proc/mdstat
Personalities : [raid1] [raid10]
md127 : active raid10 sdb4[0] sda4[1]
897500672 blocks super 1.2 2 near-copies [2/2] [UU]
[==========>..........] check = 50.4% (452485504/897500672) finish=15500.3min speed=478K/sec
........
I was using a small box as a router and one of the ports started going off and coming back at 100M. I truly believe it is simply that it was a case of overheating. Although CPUtemps were only about 67 degrees, the physical box itself was almost burning hot. Isolved the cooling issue and never had the issue again.
Jul 28 15:09:27 swithbox kernel: e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
Jul 28 15:09:28 swithbox kernel:........
This is very frustrating but the fix is usually easy once you read this blog. It's very frustrating when you find that your Linux / Ubuntu laptop's wifi will NEVER work unless it is plugged into the power. The wifi menu may say "Wifi disabled by hardware switch". You may find that your laptop has no switch or has a function wifi button on the keyboard but this does not work or have any effect.
The cause is usual a "wmi" kernel module and simply doing an........
yum -y install gcc make gperf genisoimage flex bison ncurses ncurses-devel pcre-devel augeas-devel augeas readline-devel
checking for cpio... cpio
checking for gperf... no
configure: error: gperf must be installed
configure: error: Package requirements (augeas >= 1.2.0) were not met:
Requested 'augeas >= 1.2.0' but version of augeas is 1.0.0
yum remove augeas augeas-libs augeas-devel
wget http://downl........
apt install software-properties-common
add-apt-repository ppa:deadsnakes/ppa
apt update
apt install python3-pip
apt install python3.7 curl gnupg python3.7-dev git
ln -s /usr/bin/python3.7 /usr/bin/python3
pip3 install numpy keras_preprocessing
curl https://bazel.build/bazel-release.pub.gpg | sudo apt-key add -
echo "deb [arch=amd64] http://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel........
Unless you are using OpenStack, AWS etc then cloud-init is just some bloat that slows down the booting of your VMand can actually halt it from booting if it doesn't have a proper working IP (not good!).
#remove cloud init!
Debian based Ubuntu / Mint
sudo apt remove cloud-init
RHEL / CentOS based
yum remove cloud-init
........
Iam going to build this based on a series of small howto QEMU / KVMposts I've made as I feel much of the information is actually hard to find and piece together from the rest of the web.
What I'm going to focus on is how to use virtio as the NIC because if you don't you get very slow NIC speeds but with the virtio NIC model you basically get host speeds.
/usr/libexec/qemu-kvm -enable-kvm -smp 8 -m 16000 -net user -net nic,model=virtio -drive file=ubuntu-gpt2l........
Most newer distros inexplicably cause your NIC to have what Icall "random" non-standard name conventions because of systemd.
This is a big problem for many people and especially those running servers. Imagine that you have a static IPconfigured for ens33 but then the hard disk is moved to a newer system, the NIC could be anything from ens33 to enp0s1, meaning that manual intervention is required to go and update the NIC config file (eg. /etc/network/interfa........
This is caused because the user is running as qemu for virt-resize and if qemu does not have privileges to read from the source and write to the destination, it will fail with the below. So either change the uid of qemu or change the ownership of the source and target.
Solution:
export LIBGUESTFS_BACKEND=direct
virt-resize --expand /dev/sda2 /root/kvmtemplates/windows2019-eval-template.img /root/kvmguests/kvmkvmuser4515........
When authentication times out that is one thing, but when it just fails like below Asterisk by default will not re-register until you the admin reload the sip or asterisk server:
voipserver*CLI> sip show registry
Host dnsmgr Username Refresh State&........
Just run this apt install command
sudo apt install pepperflashplugin-nonfree browser-plugin-freshplayer-pepperflash
After this restart your browser and check Adobe's site to verify if your Pepper flash is working and showing at least version 32.
https://helpx.adobe.com/flash-player.html
As you'll see below it will download the latest version which is currently 32 and this was not possible with the old/crappy deprecated adobe-flash plu........
I used to believe that for Desktops especially that the "ondemand" CPUfrequency changing that kernels included with Ubuntu and Debian based distros have would be sufficient for snappy performance.
However, you can feel the lack of performance on the fastest computer if you have ondemand. A lot of times even under high load 100% of your CPUfrequency in MHz will not be used.
For example a 2.8Ghz CPUmay only run at 1.8MHz or even .9GHz. Now........
mdadm --create /dev/md0 --level 1 --raid-devices 2 /dev/sdb1 missing --metadata=0.90
mdadm: super0.90 cannot open /dev/sdb1: Device or resource busy
mdadm: /dev/sdb1 is not suitable for this array.
mdadm: create aborted
Sometimes running "partprobe" can fix this. Other times it requires a reboot.
One other manual thing that can be done is the following to fix it (if dm is using and blocking it):........
yum -y install wget unzip
wget https://download.nextcloud.com/server/releases/nextcloud-18.0.2.zip
unzip nextcloud-18.0.2.zip
yum -y install php php-mysqlnd php-json php-zip php-dom php-xml php-libxml php-mbstring php-gd mysql mysql-server
Last metadata expiration check: 0:58:02 ago on Fri 13 Mar 2020 02:12:49 PM EDT.
Dependencies resolved.
===================================================================........
This happens when upgrading to Apache 2.4 from 2.2 or just because you don't have the right permissions set which we'll get into.
You need this in the ........
pip install PIL
ERROR: Could not find a version that satisfies the requirement PIL (from versions: none)
ERROR: No matching distribution found for PIL
The import name is PILbut the actual pip package is called "Pillow"
pip install Pillow........
If you've ever gotten errors like this the solution is simple, you need i386 enabled on your 64-bit install because wine depends on some 32-bit x86 libraries:
dpkg --add-architecture i386
apt update
apt install wine
After that it will install just fine.
apt install wine
Reading package lists... Done
Building dependency tree
Reading state information... Done........
This is sure simple if you follow the guide but it took a lot of hacking around to make this work on Debian/Ubuntu!
Now before you ask why bother running wine and python, the reason is because Python executables are NOT cross-platform. If you run pyinstaller in Linux, that binary will only run on Linux and the same if you do it in Windows. So it is preferable if you have a single environment that you can create Linux and Windows binaries from rather than running 2 separate........
The scenario here is that you have some sort of remote headless Linux server but would like to run some programs on them and get graphical access to them. The problem is that the remote server may be an image or VMwithout any virtual GPU and even if so, it is likely without KDE or Gnome, so there's no real way to do this, unless you follow our guide.
Install xvfb
apt install xvfb
Reading package lists... D........
If you are getting this error it is usually caused by having more than 5 keys in your ".ssh" directory. It is a bit of a bug and this is how it manifests itself.
You will find at this point that you are not given any chance to enter a password, or if you are using key based auth that the same thing happens. You'll also find that this is happening with ALLservers you try connecting to.
The solution is to move away key pairs from .ssh so that there ar........
Mar 22 13:46:14 box named[31767]: validating @0x7f51bc001550: . DNSKEY: unable to find a DNSKEY which verifies the DNSKEY RRset and also matches a trusted key for '.'
Mar 22 13:46:14 box named[31767]: validating @0x7f51bc001550: . DNSKEY: please check the 'trusted-keys' for '.' in named.conf.
Mar 22 13:46:14 box named[31767]: error (broken trust chain) resolving './NS/IN': 192.36.148.17#53
One possibility is sometimes that your time is ou........
httpd: Syntax error on line 221 of /etc/httpd/conf/httpd.conf: Syntax error on line 6 of /etc/httpd/conf.d/php.conf: Cannot load modules/libphp5.so into server: /lib64/libresolv.so.2: symbol __h_errno, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
This is usually caused by a mismatch in OpenSSLversion. Interestingly enough a lot of times if it has happened during an update of your system, or after, usually just restarting httpd........
Occasionally my whole screen locks up and I cannot even swith to the console and I find this in my syslog:
*-display
description: VGA compatible controller
product: Mullins [Radeon R3 Graphics]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
 ........
MySQL on Debian versions is configured differently than the native local MySQL plugin so you will be disappointed when your password on the mysql client fails by default.
Here is how you reset the MySQL root password the proper and "working way"
#first we gracefully stop mysql
sudo systemctl stop mysql;
#then we forcefully kill any mysqld process just in case
sudo killall -9 mysqld mysqld_safe;........
A big problem over ssh and especially sshfs is that your connection will often timeout and disconnect after inactivity.
To fix this you can modify the server but it may not be practical or you may not have access. Why not send keep alives fom your end (client side)?
Just edit /etc/ssh/ssh_config (not to be confused with sshd_config as that is the server side):
Find the line that says "Host *" and change it like this:........
sudo usermod -a -G groupname username
It's really simple like above, the -a is for append so that you are not changing their main group, but adding them to another additonal group. Just change "groupname" to your group and "username" to the user you want to be added to "groupname".
A common task these days is getting your user access to kvm for virtualization so the KVM/QEMUprocess........
This is only really necessary in the case you don't want DHCP. If you are dealing with an encrypted LUKS server on the internet, you will often want to have a static IP so you know which IP to connect to (or if you have a semi-static IP assigned by DHCP).
SET IP Address by /etc/initramfs-tools/initramfs.conf
IP Address=192.168.1.27
Gateway=192.168.1.1
Subnet Mask: 255.255.255.0
Hostname=myhome.com
IP=192.1........
The reason for doing this is that the installer doesn't seem to work properly for LUKS and the server installer doesn't even support LUKS anymore. When you use the GUI install on Desktop for LUKS it won't boot and will just hang after you enter your password. So the only reliable way is to do it ourselves.
1.) Make a default minimal install of Ubuntu
2.) Have a secondary disk on the server or VM.
3.)........
Create your netplan file
vi /etc/netplan/01-netcfg.yaml
network:
version: 2
renderer: networkd
ethernets:
ens3:
dhcp4: no
........
Yes you have that right, the network service in RHEL8 / CentOS 8 / Rocky Linux / Alma Linux no longer exists. So there is no more systemctl restart network
You can restart NetworkManager but it doesn't have the same effect or ifup/ifdown on all interfaces.
Generally if NetworkManager is installed you will want to restart it or it won't apply the settings from ifcfg.
systemctl restart NetworkManager
To repl........
The cool thing here is that we only need 1 drive to make a RAID 10 or RAID 1 array, we just tell the Linux mdadm utility that the other drive is "missing" and we can then add our original drive to the array after booting into our new RAID array.
Step#1 Install tools we need
yum -y install mdadm rsync
Step #2 Create your partitions on the drive that will be our RAID array
Here I assume it is /dev........
This is the reason that I don't like the new ADATA USB drives such as the UV128/64GB or 128GB drives and other ones that look to be the same style (the green sliding USB connector).
They just don't work well from new and never work properly at any point.
[ 788.242463] usb 1-1.2: new high-speed USB device number 16 using ehci-pci
[ 788.339816] usb 1-1.2: New USB device found, idVendor=125f, idProduct=db8a
[ 7........
The problem is that by default ssh-keygen loves to generate an easy to crack 2048 bit key (RSA). Supposedly having a larger keysize helps such as 4096 or 8096 but it is thought to be useless still against Quantum computing.
How can I check my existing keysize and type?
ssh-keygen -lf /path/to/your/id_rsa.pub
The output will be something like below followed by the hash. The first number is the key size and the second part will b........
In this case I am executing using "python3" but what you find in cases like this can be surprising.
The most common issues are that someone has a module for python 2 "pip" and doesn't realize they need "pip3" to install it for python3, but this is not one of those cases.
ModuleNotFoundError: No module named 'bs4'
OKmaybe we didn't install it for python3?
[........
This is not about using ssh as a proxy, but rather, using a proxy when you are SSHing to another host and using ProxyCommand (where we normally use nc as our proxy tool).
In newer versions of nc the syntax has changed to the following:
ssh -o ProxyCommand="nc -x 127.0.0.1:1234" %h %p user@host
The format must be like above in newer nc versions.
Just be sure to change the 1234 to the port of your SOC........
If you just do a normal chown user.user somedir it won't work. You will see the ownership is still the previous owner.
How To Change Ownership Of Symlink:
The simplest part is just adding the -h which means no dereference so it applies the ownership on the symlink and does not try (and fail) to change ownership of the dereferenced symlink destination.
chown -h user.user somedir........
It is fairly simple to use once you know how to use it. However, the tricky thing is that by default it doesn't seem to be active or listen on any interface on manually specified.
How To Install ifplugd
First we install ifplugd
sudo apt install ifplugd
Let's enable it on our desired device(s)
vi /etc/default/ifplugd
set this line as so:........
dd is a very handy tool and there are some more practical things we can do. For example if we want to dump a 3TB drive and want to preserve it and only 200GB are being used on the 3TB we can save a lot of space with gzip.
Backing Stuff up with dd
How to Use dd to backup a raw hard drive and tar gzip at once
Change /dev/sda to the drive you want to backup
Change /mnt/extras........
The easiest way to know if your videos are playing with GPU acceleration are to watch the process of xplayer, mpv or whatever you are playing. The CPU usage should be no more than 10% for that process/program if it is using acceleration.
Let's manually play with vdpau to make sure it works before we make it permanent:
First make sure you have libvdpau installed:
sudo apt install vdpau-driver-all
If yo........
I find that the default settings for the radeon driver that is applied to most AMD cards is horrible. For example by default TearFree is not enabled and it causes videos to have some kind of square artifacts.
Here are the settings I have found most suitable for AMD cards:
You need to create file in the following path and restart Xorg or your computer to apply it:
*Beware that making a mistake here will possibly make your computer........
This is a gotcha but be aware sometimes iptables may be active and loaded by default.
Also make sure you don't just disable firewalld but also stop it otherwise it will still block stuff:
systemctl stop firewalld
If the above is not the issue then it is possible iptables is running and blocking stuff too, so you'll need to stop iptables.
So in addition to opening firewalld or disabling it, you would need to disable iptables........
mysql reset root password.
Oops I can't remember my MySQL root password!
[root@centos7test etc]# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
First we need to stop mariadb:
systemctl stop mariadb
Now we need to restart it with skip-grant-tables whic........
yum -y install mariadb-server
systemctl start mariadb
mysql_secure_installation
Now we need to secure our install and set the MariaDB root password:
The lines you need to act on are marked in bold shown with the answer you need.
mysql_secure_installation
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
SER........
This problem has been around forever, Linux seems to think it is fine to use the r8169 driver for an r8168 NIC but this often causes problems including the link not working at all.
In my case ethttool shows the link up and detected but it simply does not work especially on a laptop that has been resumed from suspension. Sometimes it takes several minutes for it to work or to unplug and replug the ethernet.
Here is the solution:
Install th........
You need to disable vsync like this when running glxgears:
vblank_mode=0 glxgears
For Nvidia drivers do this:
__GL_SYNC_TO_VBLANK=0 glxgears
Notice the higher than 59-60 fps results with vblank_mode=0:
ATTENTION: default value of option vblank_mode overridden by environment.
7919 frames in 5.0 seconds = 1583.704 FPS
8187 frames in 5.0 seconds = 1637.266 FPS........
Downloading and compiling from source to get the latest version of Asterisk is really simple with this guide.
apt install gcc make g++ libedit-dev uuid-dev libjansson-dev apt install libxml2-dev sqlite3 libsqlite3-dev
wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-16-current.tar.gz
tar -zxvf asterisk-16-current.tar.gz
cd asterisk-16.6.2/
./configure
If you get this error change y........
If you can print other PDFs but not a particular one it is very likely that the PDF size is A4 (the longer, skinnier Asian paper size) instead of the North American letter size ( 8.5" x 11"). This breaks printing in most cases. Or it may print if you find a program that ignores the size issue.
Here is an example of an A4 being rejected by a printer in Ubuntu Linux via CUPS
Cannot print PDF CUPS Samsung C460:
Processin........
This is all controlled by /etc/issue
You can basically enter anything in there that you like, but there are preset variables that are mentioned at the end of the page that discuss this.
Some examples of /etc/issue:
Centos 7:
S
Kernel r on an m
Ubuntu 16.04:
Ubuntu 16.04.6 LTS n l
You can also insert any of t........
A lot of times busy servers will have this issue and you cannot even force kill -9 the apachectl or httpd process:
[root@apachebox stats]# ps aux|grep httpd
root 1547 0.0 0.2 495452 32396 ? Ds Sep08 3:23 /usr/sbin/httpd
root 3543 0.0 0.0 6448 724 pts/1 S+ 13:11&nbs........
Most of us know the heredoc method but what if you need a basic query done repeatedly and manually while working from bash? It is a pain to manually type mysql and login each time.
With this command below you can semi-automate those queries:
echo "use somedb; select * from auctions" | mysql -u root --password="yourpassword"
Just modify the above to suit your needs and you can add more queries by adding a sem........
It is very silly but the default on the ifup-eth script tells dhclient ( the program that obtains a DHCP IPaddress if you have selected DHCPin your ifcfg-eth* config file) to EXIT / QUIT if the first attempt to obtain a lease fails.
No amount of dhclient.conf settings will fix this because if dhclient is started with -1 (which it is by default)then dhclient will quit.
This is obviously very bad for MOST cases. Say for example you have a power outage or........
Oct 18 11:06:46 server systemd[529]: rc-local.service: Failed at step EXEC spawning /etc/rc.local: Exec format error
Oct 18 11:06:46 server systemd[1]: rc-local.service: Control process exited, code=exited status=203
Oct 18 11:06:46 server systemd[1]: Failed to start /etc/rc.local Compatibility.
Oct 18 11:06:46 server systemd[1]: rc-local.service: Unit entered failed state.
Oct 18 11:06:46 server systemd[1]: rc-local.service: Failed with result 'exit-code'.........
Create Database:
create database yourdbname;
Show All Databases:
show databases;
Change Database:
use mysql;
Drop / Delete a MySQL Database:
drop database nameofyourdatabase;........
Adjust to suit your needs. Currently this would kill any whois process running for more than 30 seconds or more than 1 minute.
Add it as a cronjob. The motivation is that some commands have no timeout and just end up using up CPU and memory for no reason while never exiting to free resources.
#!/bin/bash
IFS=$(echo -en "nb")
for pid in `ps aux|grep whois`; do
echo "pid=::$pid::&qu........
sudo pip3 install python-docx
[sudo] password for :
Downloading/unpacking python-docx
Downloading python-docx-0.8.10.tar.gz (5.5MB): 5.5MB downloaded
Running setup.py (path:/tmp/pip_build_root/python-docx/setup.py) egg_info for package python-docx
no previously-included directories found matching 'docs/.build'
warning: no previously-included files matching '.DS_Store' foun........
Video Links:
How To Setup 2 Phones on a Single CME Router and get the GUI going.
How to use Dialpeers with CME with two routers
How to implement call restrictions using COR / Class of Restriction
Getting started, let's enable ephones and DNs we can add a phone with........
service sshd status
â— ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
Active: failed (Result: start-limit-hit) since Wed 2019-10-02 11:07:54 EDT; 36s ago
Process: 476 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=255)
Oct 02 11:07:54 box systemd[1]: Failed to start OpenBSD Secure Shell server.
Oct 02 11:07:54 box sys........
A common method in bash is to assign output to a variable like this:
somevar=`uptime`
That works too but it could be more efficient to do something like this:
if [[ $(uptime|awk '{print $3}') > 20 ]]; then
echo "uptime greater than 20 days";
fi........
This often happens if you are adding a secondary route, especially with Linux source based routing.
ip route add default via 10.10.10.254 table 10
RTNETLINK answers: Network is unreachable
If that happens you will probably find that it is unreachable because your NIC does not have an IP in the 10.10.10.0/24 range so just assign an IP in that range to your NIC and try again.
eg. ifconfig eth0 10.10.10.254 netmask 255.255.255.0 up........
By default at least on Centos 7 nfs only allows 8 connections and starts 8 nfsd daemons.
To fix this edit this file:/etc/sysconfig/nfs
Edit the line "RPCNFSDCOUNT" (uncomment it so it looks like this:
RPCNFSDCOUNT=30
In the example above we are setting 30 nfsd daemons to run (or in other words 30 connections are possible this way).........
Now older versions of qemu-kvm didn't throw this error say if you just had "-video cirrus" when starting qemu-kvm. But newer versions do care.
And this probably only applies to you if you are running from bash/terminal with remote kvm images.
What you need to do is remove the "-video" part and just add -vnc :5
eg. this would fix the error:
qemu-system-x86_64 -enable-kvm -boot order=cd,once=dc -m 1024 -drive........
In Centos 7 tftpd will not work with selinux. Clients will not be able to connect and this is all you'll see in the log (then nothing more):
Sep 18 14:39:15 localhost xinetd[4327]: START: tftp pid=4331 from=192.168.1.65
On the client/computer side you will see this:
TFTP.
PXE-M0F: Exiting Intel Boot Agent
Basically the client is being instantly connected and bloc........
Having a network bridge allows you to bridge traffic under multiple devices so they can talk natively without using any special routing, iptables/firewall or other trickery.
To create your bridge you need the bridge-utils package for brctl and if you want to do things like bridge VMs that run on a tap device you will need the uml-utilities which provides "tunctl".
1.) Install the utilities to make our bridge
sudo apt-get i........
I think this is more so an issue with kernel modules not being included. I had this issue on Linux Mint because a new kernel I upgraded to DIDNOT have the "extra" modules and part of that reason is also because older kernels are named differently than new ones.
Take this example article below that shows it in action.
If you were previously........
I don't consider a lot of these "extra" kernel modules "nice to have" as they often contain drivers for essential items like your soundcard, your NIC and many other devices that may not work. Sometimes you may find that "sound" or "ethernet" worked before a kernel/OS upgrade and now in the new version they don't. Often it will be because you need to install the "extra" kernel modules.
One other weird thing is that sometimes........
It is really simple using .htaccess with mod_rewrite.
Here is all you need:
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://site.com/$1 [R=301,L]
Another more graceful way is to use the %{SERVER_NAME}variable to make it dynamic. Just be careful that the server name will always match what you expect. (eg. if you are doing load balancing or clustering what if the server name may be somethi........
python3 testserver.com-car-scraping.py html.txt
Traceback (most recent call last):
File "testserver.com-car-scraping.py", line 5, in
import mysql.connector
ImportError: No module named 'mysql'
For some reason it won't install properly even though I have the mysql client on this machine installed too.
Solution:
You need the mys........
CPU:Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz
MOBO: Manufacturer: ASUSTeK COMPUTER INC.
Product Name: P8H61-M LX3 PLUS R2.0
qemu-kvm-0.12.1.2-2.506.el6_10.1.x86_64
This is weird but the only OS I've found this machine doesn't work with is Windows 2019 Server. Ihave no idea, when 2008, 2012 work f........
If you've just installed VBox and it is not starting or working, the most common problem is usually that you don't have your kernel source installed, which means there is no kernel driver for vbox so it can't work.
You may get an error that says "Kernel driver not installed" in your Virtualbox.
So the first thing you should do is install your kernel source by running this:
sudo apt-get install linux-headers-`uname -r`........
By default bind will not respond to outside queries for security reasons.
In most distributions you will find the default in /etc/named.conf looks like this at the top under options:
listen-on port 53 { 127.0.0.1; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";........
The way of doing it in mint is different than gnome and ubuntu.
gsettings set org.mate.background picture-filename /path/to/file.jpg
*If you try to use the gnome way it will NOT work with Linux Mint:
gsettings set org.gnome.desktop.background picture-uri /some/pic.jpg........
Use these flags:
convert -alpha flatten -alpha remove "output.pdf" ljll.jpg
And even the pesky black backgrounds should be gone after converting to jpg........
This is a security hole in my opinion and should be plugged by editing the lock screen ui layout:
vi /usr/share/mate-screensaver/lock-dialog-default.ui
#find these objects and set the visible property to false
object class="GtkLabel" id="note-tab-label"
object class="GtkLabel" id="auth-username-label>
object class="GtkLabel" id="auth-realname-label"........
By default printscreen or alt print screen will get the whole desktop or the application in focus, respectively. But what if you want to select a portion of the screen?
gnome-screenshot:
ksnapshot
compiz
This is a nicely integrated solution
sudo apt-get install compizconfig-s........
SSH helps keep us secure in many ways, one of those is the host-key fingerprint which is unique. If you have been connecting to an SSH server that you've made no changes to and suddenly ssh warns that the key doesn't match then you have a problem.
But how about connecting to an existing server for the first time on a new machine or client?
A lot of new clients calculate it using an SHA256 hash but it is not as easy on your host machine to produce the sam........
This would be crucial especially if the phone is hardened, not being able to reset or change settings could prevent a phone registering in a new environment or even when migrating from office to office. This applies even if you are trying to migrate the phone to another platform such as Asterisk/FreePBX etc...
This guide applies to nearly all of the Cisco IP phones that you would use in CME or CUCM from several years ago including models: 9900, 9971, 8800, 8900, 8845, 8851, 8841........
Opening Firefox from the CLI reveals the following as the cause of the error:
Query failed: Error: Error(s) encountered during statement execution: no such table: moz_favicons
The symptoms of this issue are that in the address bar you cannot hit enter to browse to a site/url/address and your history cannot be accessed, nor does your history show up in the address bar when typing previously used addresses.
This usually happens because you've........
Install Errors on Version 12:
This error happened on QEMU emulator version 2.11.1 pve-qemu-kvm_2.11.1-5
on Proxmox/Debian but installing on QEMU.12 on Centos 6 did not produce the error.
*Update it is not related to the OS or QEMU version. This happened in Centos 6 too after a second install.
What really causes this even though you successfully install........
If you get error messages like this it is usually because /var/run/sshd does not exist.
root@userbox:/# service sshd status
â— ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enab
Active: failed (Result: start-limit-hit) since Wed 2019-04-10 02:24:44 EDT; 1
Process: 511 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=255)........
I have seen this in a few rare cases after a reboot, where all folders and files will have the Read Only Attribute. If you uncheck it, it will just come back. It is more of a filesystem issue in Windows than a configuration issue and it looks like when Windows detects a badly corrupted filesystem that it will make things read-only, sort of like Linux would.
If you are Administrator or the owner of the folder and this is happening it is probably due to the reasoning mention........
The strange thing is that usually the first install or two will work on any new machine but then it suddenly won't. I had this experience on QEMU 2.13 on a different machine. There is something finicky or buggy about the CUCM installer even when choosing the same virtual hardware specs.
qemu-kvm command:
/usr/libexec/qemu-kvm -version
QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2-2.506.el6_10.1), Copyright (c) 2003-2008 Fabrice Bellard
........
There are multiple layers but most are enabled by default such as the setting in the Phone Device Settings.
However the one not enabled by default is the one in "Enterprise Phone Configuration".
Enable "Cisco Camera" and then reboot your phones to enable it.........
Oops did you get this error trying to install an oldschool driver and think it is hopeless in a new version of Windows?
First of all it is almost never a program compatibility issue:
........
It is much more useful to have meaningful and detailed logging from tftp to see what is or isn't happening especially for VOIPand other embedded device appications:
Edit the file:
vi /etc/xinetd.d/tftp
Change the server line like this:
server_args = -s /var/lib/tftpboot........
This will find all tap devices and try deleting all of them. Of course don't run this if there is a chance an unused tap device is necessary and would not be created by the script ro application using it.
for tap in `ifconfig -a|grep tap[0-255]|awk '{print $1}'`; do
tunctl -d $tap
done........
Are you tired of coming back to your computer only to find your SSH connections have been broken? Even worse are the ones that hang where it appears to be connected but it is really not.
The one option you have is an SSHclient side modification to send KeepAlive packets, sometimes this can also keep up your WiFi connection and stop it from disconnecting you as well.
To make the keep alive changes for your just yourself (not system wide)........
This is the closest way to disabling it without using the "libata.force=noncq" kernel boot option is to set the queue to a depth of 1 which doesn't actually disable it.
Change the sdc below to match the device you want to disable NCQ for.
[root@officebox ~]# echo "1" > /sys/block/sdc/device/queue_depth
Errors that indicate you are having a performance issue are these in messages or dmesg relating to N........
This is usually because the Group Policy forbids that user or group from logging in.
run "gpmc" (not "gpedit.msc" as that is for local computer settings when you are not using Active Directory) or go to Administrative Tools and Group Policy Management.
Edit the default domain policy like below........
chroot which stands for change root allows you to virtually operate in another operating system even though you haven't booted it. It is commonly used to deploy new distros, applications and to fix a broken Linux/Unix install or prep a new system image without having to physically boot the drive or disk.
So in this example let's say we have a drive that has a Linux OS installed on /dev/sdb1 and we have mounted this partition on /mnt/sdb1
The key point is to edit the &quo........
WARNING: Image format was not specified for '/mnt/space/cucm12.img' and probing guessed raw.
Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
#you should manually specify the format
q........
This is a common issue that I haven't seen many answers for on the internet. When you are using Linux as your host machine and you are connecting to another Linux machine over VNC you CANNOT use Ctrl+Alt+F1 to change virtual consoles as it sends the keys to your actual local machine.
In many versions of Linux you can cycle through virtual terminals including over VNC using this:
Alt + Left Arrow or Alt + Right Arrow
This........
https://docs.microsoft.com/en-us/powershell/module/skype/?view=skype-ps
Troubleshooting Client Connectivity Issues
The first step is to enable full logging in the Skype Client itself and then check the log on the client side. In Windows this normally means going to the Skype client "settings" and then "Enable Full Logging".
Aft........
Uh oh, so you're working on some super l33t code or other stuff that is super important and Linux Mint's MATE or Cinnamon window manager freezes. This means maybe you can move your mouse but you can't click anything, you can't Alt + Tab to another program but everything appears to be working other than that.
The first thing you would do is Ctrl + Alt + F1 (or whatever virtual terminal you want) and get into the Linux bash prompt (the black screen where things really happen :))........
This may sound silly but often on the same machine multiple versions of SQL may be installed due to other applications.
How do we know which one we are running and connected to?
Use the query:
select @@version
........
If you don't aleady have it, you'll need EPEL
Install LXC
yum -y install lxc lxc-templates
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: mirror.it.ubc.ca
* epel: mirrors.kernel.org
* extras: mirror.it.ubc.ca
* updates:........
Install Issues:
How to Make CUCM iso /modify to work on non-VMWare machines like QEMU/Xen/OpenStack
If you get kernel panic errors in VBOX usually disabling Nested Paging will fix the issue (thanks to Mark).
ks_pre.sh error is caused by having the wrong VDX pattern (change it do sd per guide link above) and/or the wrong VMSpecs (Cisco req........
So say you are behind a typical NAT/LAN setup whether at home, work or while travelling. What if you have a computer or server that you need to connect to from the outside?
Yes you could use a VPN but a quick and dirty, temporary and secure way is to use SSH's Reverse Tunneling Proxy feature.
Requirements
On the remote ssh server host you need the GatewayPorts option enabled in sshd_config (be........
For some reason, perhaps you don't want to run a daemon or let Letsencrypt have access to your production server.
There is a way to use it like a normal CSR/CA setup in manual mode.
./letsencrypt-auto certonly --manual -d realtechtalk.com - www.realtechtalk.com
Â
Eventually you will get prompted to create a certain path and file with certain data:
Create a file containing just this data:
Casdfasfadsfsad........
In this case if fullurl started with http://www. then it is a match
Note that you CANNOT put quotes around it or it becomes a literal match which will not work as intended in the bash script example below.
if [[ $fullurl == http://www.* ]]; then
echo "do something"
fi
Another example say we want to delete every file or dir in a path except sometihng that starts with "hellothere":
for file in `l........
In most of the Cisco router IOS I find the ports like ge0/0 ge0/1 and ge0/2 or whatever your ports are down. They will not even give you a link light. So one of the first tasks should be getting the port you are working with up.
In my case the first goal is often connectivity with the LAN and WAN.
LAN = your local area network (eg. in the office/home )
WAN= your ISP/public internet (eg. fiber/cable/dsl/ethernet).........
00:55:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
00:55:09: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
Switch(config)#no logging console
........
Switch#show ip dhcp snooping
Switch DHCP snooping is disabled
DHCP snooping is configured on following VLANs:
1
Insertion of option 82 is enabled
circuit-id format: vlan-mod-port
remote-id format: MAC
Option 82 on untrusted port is not allowed
Verification of hwaddr field is enabled
Interface&nb........
Enter configuration console:
enable
configure terminal
This is important because if your console doesn't look like below none of the commands will work!
Switch(config)#
Save and Apply Settings
wr
Show Switch Configuration:
show run
Show Port List/Sta........
This works on the 2000 and 3000 series generally.
*The easy way is to just hold the mode button for 10+ seconds.
The full/proper way is below:
1.) Either power on the unit and hold the "mode" button or hold the "mode" button until you see the below:
00:04:08: %SYS-7-NV_BLOCK_INIT: Initalized the geometry of nvram
00:04:08: %EXPRESS_SETUP-6-CONFIG_IS_RESET: The configur........
The key thing is that you must use a "machine"id of "pc-1.3" or it will say your hardware is not supported.
Additionally you MUST use a virtio disk or you will get a ks_pre.sh error as soon as the install starts (a look at logs will show it can't find a disk). This is funny because even though the OS finds the disk and an fdisk -l shows it, it looks like the script looks for a /dev/vda device (virtio) and nothing else, so if you didn't use Virtio as you........
What you need to do if you have taken a dd or real raw image dump of a hard disk:
VBoxManage convertdd windows2019-eval-template.img windows2019.vdi --format VDI
The .img is the raw dd dump and the .vdi is the output file.
--format VDIspecifies to output to .vdi format
If you are in a pinch you can always use qemu-kvm binary and manually specify the .img as your disk and i........
Idid a systemctl restart networking and it broke Proxmox VM connectivity!
#proxmox is the problem after restarting the network the tap devices go to disabled state
[2230884.919905] vmbr0: port 7(tap118i0) entered disabled state
[2230884.948864] vmbr0: port 8(tap122i0) entered disabled state
[2230884.972748] vmbr0: port 6(tap119i0) entered disabled state
[2230885.004745] vmbr0: port 5(tap117i0) entered disabled state
[2230885.03673........
ln -s --force newfile.jpg existingsymlink.jpg
All you do is use the --force flag to force/update the existing one.
The above modifies a symlink called "existingsymlink.jpg" and points it to "newfile.jpg" as the source.........
This is not about systemd/systemctl and not about "onboot" so there's no rc.local trick here but it's the GUI/Gnome etc when a user logs in that a command is launched.
Put this in your home dir
The .config/autostart directory is where Linux Mint/Ubuntu checks for autostart application config files
mkdir -p ~/.config/autostart
Create a new entry/file that starts an application........
If you see this in /etc/sudoers it is NOT a comment but an include.
#includedir /etc/sudoers.d
For example in Linux mint sudoers.d contains the following files:
casper mintupdate README
casper for example contains the following sudoers line:
mint ALL=(ALL) NOPASSWD: ALL
So if you are messing ar........
Do you hate how Centos 7 defaults to allocating most of your valuable space to /home even though it is a production server?
Here is a quick guide on how to take back that space live, while online (of course make sure you have backups just in case something goes wrong!):
First we will reduce our home dir by 100G:
lvreduce -L -100G /dev/mapper/centos-home
WARNING: Reducing active and open logical volume to ........
./certbot-auto --apache certonly
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator apache, Installer apache
No names were found in your configuration files. Please enter in your domain
name(s) (comma and/or space separated) (Enter 'c' to cancel): yourdomain.com
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for yourdomain.com
Cleaning........
debug1: Local connections to LOCALHOST:18006 forwarded to remote address 192.168.1.93:8006
debug1: Local forwarding listening on 127.0.0.1 port 18006.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on ::1 port 18006.
bind: Cannot assign requested address
What we are seeing is that we can't listen on an IPV6 address of ::1. We need to tell SSH to stop using IPV6 so we'll edit ssh_config to take care of this issue........
Jan 30 17:16:10 localhost sshd[25385]: error: Failed to allocate internet-domain X11 display socket.
The solution for me on the server side was the following in sshd_config:
AddressFamily inet
*Remember to restart sshd and also reconnect from the client side.
Ihad all the normal X11 settings on the server but it just stopped........
The defaults in Windows 2016 server leave clients crippled so they can't even download basic files or software. But Group Policy Management Editor comes to our rescue!
Use cmd or Powershell and run:
gpme.msc
Choose your domain/computer and then navigate like below and create a new menu entry for IE11 or whatever your version is. Don't be worried if the highest version is IE10 it means that it applies to IE10 AND above.........
Navigate to Tools -> Account Settings -> Server Settings
Uncheck the following:
"Check for new messages on startup"
"Check for new messages every NN minutes"
"Automatically download new messages".
Source: http://forums.mozillazine.org/viewtopic.php?t=635510........
Whether you are at work, at the coffee shop or on the public internet here are some basic but effective rules for iptables that lock things down (eg. no one can SMB or SSH to you or really anything):
# Generated by iptables-save v1.4.21 on Fri Dec 14 14:00:08 2018
*nat
:PREROUTING ACCEPT [160:19844]
:INPUT ACCEPT [4:357]
:OUTPUT ACCEPT [2955:182236]
:POSTROUTING ACCEPT [2955:182236]
COMMIT
# Completed on Fri Dec 14........
The main use I have for this is virtual servers being able to use an LVM volume but not occupying all of the space. It saves time in deploying machines and copying them so you are only copying the space they are using (eg. 5GB / 60GB vs the full 60GB). There are some disadvantages which is mainly the fact that thin pools by their nature allow you to "overallocate" disk space which is that you could use more space than is available on the disk itself and corrupt your data........
cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md127 : active (auto-read-only) raid10 sdc1[0] sdb1[2]
1953382400 blocks super 1.2 512K chunks 2 far-copies [2/1] [U_]
resync=PENDING
bitmap: 15/15 pages [60KB], 65536KB chunk
Solution force repai........
I tried to stop a qemu-img copy or clone and it broke everything. It was fine to "stop" it from the GUI but a process still persisted so I killed the relevant qemu-img and the kernel went crazy. It also may not have helped that I tried to lvremove a different volume (an unused disk). But either way it breaks LVM (you cannot even run lvdisplay) so a reboot is necessary.
Jan 17 06:45:21 testserver kernel: [ 5680.439337] systemd-udevd D 0&nbs........
When using strip_tags and html_entity_decode with PHPit often breaks and produces annoying diamonds with question marks.
It is probably because of characters like these:
… (looks like 3 dots but it is a single weird character).
’ (looks like a normal apostraphe but it is not)
” (looks like a normal double quote but it is not).
An easy way to sort this out is to copy the above and search in an ASCII table to extend the functional........
This should apply to most Linux distributions just incase you get into trouble or wipe out the defaults by accident.
/etc/iproute2/rt_tables
#
# reserved values
#
255 local
254 main
253 default
0 unspec
#
# local
#
#1 inr.ruhep........
Below are the common errors you'll get with named AKA bind if your time is incorrect.
The simplest solution is to install and run ntpd to correct your system's time (install ntpd if it is not installed)
systemctl start ntpd
systemctl enable ntpd
Dec 20 13:36:16 hostingbox named[2169]: error (no valid DS) resolving 'develop.waxrain.com/A/IN': 14.215.150.17#53........
A lot of people just have a -j DROP to drop all unwanted traffic or traffic not explicitly allowed but there is a better solution if you want real and proper logging:
Here is another example of more advanced iptables rules.
Take an example iptables rules file
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i eth1 -p icmp -j ACCEPT........
Just find the relevant file in /etc/NetworkManager/system-connections
sudo vi /etc/NetworkManager/system-connections/Wired connection 1
[802-3-ethernet]
duplex=full
mac-address=00:00:00:FE:FE:FE
[connection]
id=Wired connection 1
type=802-3-ethernet
timestamp=1532403341
[ipv6]
method=ignore
[ipv4]
method=manual........
Set this in /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
#apply the settings
sudo sysctl -p
........
growisofs -Z /dev/sr0 critical.tar.gz.gpg
Executing 'genisoimage critical.tar.gz.gpg | builtin_dd of=/dev/sr0 obs=32k seek=0'
I: -input-charset not specified, using utf-8 (detected in locale settings)
File critical.tar.gz.gpg is larger than 4GiB-1.
-allow-limited-size was not specified. There is no way do represent this file size. Aborting.
:-( write failed: Input/output error
#remember to us........
On a test machine Iwas never able to access to a newly created 4th partiton. As we can see there are dev devices for everything but the 4th partition.
The normal "partprobe" or "kpartx" or kernel being told to rescan the block device didn't help (only a reboot did).
fdisk -l /dev/sda
Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units........
mdadm --manage /dev/md125 -a /dev/sdb4
mdadm: add new device failed for /dev/sdb4 as 3: Invalid argument
Dec 19 01:23:48 storageboxtest kernel: [ 2328.854491] md: sdb4 does not have a valid v1.2 superblock, not importing!
Dec 19 01:23:48 storageboxtest kernel: [ 2328.854499] md: md_import_device returned -22
#zero the superblock and try again!
mdadm --zero-superblock /dev/sdb4
mdadm --ma........
Do you hate it when your ISPhas old cached records because of a high TTLon the DNS record of the relevant domain? In plain English this means you often can't connect to a site or service because your ISP's DNS servers haven't gotten word of the new IP address (probably because they haven't checked). There are also some that are notorious for ignoring TTL and not updating records for days!
But if you are lucky and smart enough to have your own Linux based DNS se........
The reason for not being able to read one of these dreaded/ fillable "XFA" forms is because no Linux PDF reader that I'm aware of supports them. Part of this reasoning is for security. It is really silly, they should ban these XFA forms or at least replace the Please Wait with the non-fillable version.
Download Adobe Reader 9.5 for Linux from here:
This is the solution but only so much, at least for me I was able to view th........
First you need the "iptables-persistent" package. This gives you an init script that loads your settings from /etc/iptables/rules.v4 and rules.v6
When you install it, it wll save your default setings in /etc/iptables.
sudo apt-get install iptables-persistent
Remember that the rules are stored here:
For IPV4: /etc/iptables/rules.v4
For IPV6: /etc/iptables/r........
Before getting into the output here is my typical experience with SMART, there is what I call a "bad disk" with pending and uncorrectable sectors that cannot be reallocated.
It has caused a kernel panic and system crash repeatedly as we can see from the logs.
But SMART says it has "PASSED" its self assessment. SMART is still useful to me but it is more about looking at Current_Pending_Sector.
Any time I have had anything but 0 for that attribute it........
#to show all
VBoxManage list vms
#show ONLY running vms
VBoxManage list runningvms
VBoxManage storageattach test --storagectl "SATA" --port 0 --device 0 --type hdd --medium iscsi --server 192.168.1.91 --target "iqn.2018-12.local.abcrandom.target:sdb" --initiator "iqn.1982-01.ca.bla.tld:abc123" --t........
initiator = client
target = server
These are the first concepts you should understand which is that in iscsi essentially the "initiator" is the client and the "target" is the server.
iSCSI is derived from the old fashioned SCSI that us oldtimers grew to love. The "i" stands for Internet and the SCSI stands for "Small Computers Systems Interface" (SCSI).
iSCSI Target (Server)Setup
targetcli is the pac........
confmodules=`cat /etc/httpd/conf/httpd.conf |grep -v ^#|grep "modules/"|awk '{print $3}'|cut -d "/" -f 2`
for module in $confmodules; do
echo "module=$module"
if [ ! -f /etc/httpd/modules/$module ]; then
linenum=`awk /"$module/{ print NR; exit}" /etc/httpd/conf/httpd.conf`
sed -i "$linenum"s/.*// /etc/httpd/conf/httpd.conf
&n........
function centos7 {
release=`cat /etc/redhat-release|awk '{print $4}'|grep ^[7]`
if [ "$release" != "" ]; then
centos7='yes'
fi
}
centos7
echo "$centos7"
We create a function called "centos7" and then call it by just typing "centos7"
We then access a variable that may be set........
# a single first slash means first occurrence
# format=${haystack/needle/replacement}
# if you use a double first slash it means ALL occurrences
# format=${haystack//needle/replacement}
email=${file/.txt-marked/}
In the example above we are searching in the variable $file for ".txt-marked" and replacing with nothing (the empty part after the last / means we are replacing with n........
Cisco's CUCM (Cisco Unified Communication Manager) is a system that combines voice, video, data and mobile products into a single unified management suite. At its core, the CUCMis like a "Super PBX" that controls the flow of all communications through an organization even single or multiple site deployments.
Cisco's CUCMmakes communication more effective and simple through centralized management and unification of communications resources.........
What Is Active Directory?
Active Directory is essentially an enhanced, centralized database with a set of objects that make user management, authorization, and data management simpler. Active Directory is synonymous with "Domain Controllers" where a single "domain" often consists of multiple sites and members of the domain. Multiple domains can also be joined to belong to a tree ( a collection of domains). And the highest layer is the forest whi........
#get line number of occurrence in text file and then print out x lines from that point
#get the line number of the first occurrence of our search text
linenumber=`grep -n "someuniqueitem" inventory.txt|head -n1|cut -d ":" -f 1`
#linestop represents how many lines after the occurring line we want to print out in this case "20"
linestop=$((linenumber+20))
# sed prints out the line range we want f........
mytop is one of my favorite tools and it is fairly simple aside from a few caveats and issues that persist to this day.
To install it on Centos:
yum -y install centos
Configure ~/.mytop
vi ~/.mytop
user=root
host=localhost
db=test
#port=3306
socket=/var/lib/mysql/mysql.sock
header=1
color=1
Try runni........
When converting binary the easiest way is to write out a vertical list in a format like below and follow the formula in the table.
Example Convert 1101 1111 to decimal.
Step 1.)
Write out the binary below in vertical form (leave lots of space on the left side).
Keep this in mind that the "previous sum" starts at 0 on your first line.
Step 2.)
Formula:
2 *........
systemd is like the service manager for your Centos and other modern Linux distributions (including Debian/Mint/Ubuntu) allows you to enable services, stop them, restart them, check their status and even reboot your system.
The key commands or arguments you will use with systemctl are the following:
Unit Commands:
list-units [PATTERN...] List loaded units
&nbs........
code {
background: #f4f4f4;
border: 1px solid #ddd;
border-left: 3px solid #f36d33;
color: #666;
page-break-inside: avoid;
font-family: monospace;
font-size: 15px;
line-height: 1.6;
margin-bottom: 1.6em;
max-width: 100%;
&nb........
The problem I was having is that a css template Iwas using was causing
br's to have an empty line in between which is very undesirable especially when displaying code.
br {
display:none;
margin: 0px;
height: 0px;
}
Using CSS code like above will fix it. You technically shouldn't need the margin or height either.........
umask are the default permissions that are applied when a file or directory are created. To see this in action simply just "touch filename" or "mkdir somedir" and you'll see what default permissions are applied.
The first thing Ialways tell people you should know is to NEVER change the defaults unless you are making them more restrictive. But they work well and if you change the defaults you could end up creating a file without permission to read........
Getting an error about gi missing when running a .py python script?
Just install EPEL and install the python3-gobject package:
yum install python34-gobject........
Did you just install the minimal version by accident or want to install the GUI? No need to reinstall just tell yum to do the work for you!
You could actually have both installed and choose one as your preference on demand (although many people prefer GNOME's simplicity).
Step 1.)
Install Gnome and/or KDE.
To install the GNOME Desktop on Centos 7:
yum -y groups install "GNOME Desktop"
To........
You can do other things but this particular script is just to set all AMD cards to 80% fan speed (remember this script needs to applied everytime you reboot). You could set it is a cron or just throw it into /etc/rc.local
basepath=/sys/class/drm
for hwmon in `ls -1 /sys/class/drm|grep card[0-99]$`; do
echo card=$hwmon;
hwmonname=`ls $basepath/$hwmon/device/hwmon|grep hwmon[0-99]`
hwmonpath=$basepath/$hwmon/device/hwmon/$hwmonname
echo "ec........
This happens if you don' have an updated version normally(eg. things were working fine and you suddenly get this error):
Pool sent wrong data, cannot set epoch, disconnect
ETH: Connection lost, retry in 20 sec...
ETH: Connection lost, retry in 20 sec...
Solution - Download an updated Claymore!
........
You'll have to violate the iso9660 standards but it is necessary if you want to preserve your filesystem and filenames and shouldn't be an issue as long as you are using a modern OS like Linux.
genisoimage -o Backup-Myfiles.iso -r -J -joliet-long /some/path/
You will get errors like below (even enabling joliet-long didn't help)
genisoimage: Error: /some/filename.pdf have the same Joliet name
Joliet tree sort failed. The -joliet-lo........
#Linux Mint 18.2 how to install gajim .16.9 so you can use OMEMO encryption:
sudo apt-get install python-axolotl python-nbxmpp
wget https://gajim.org/downloads/0.16/gajim-0.16.9.tar.gz
tar -zxvf gajim-0.16.9.tar.gz
cd gajim-0.16.9
./autogen.sh ;make;sudo make install
#if you get this error you need to get a newer python-nbxmpp from here:
gajim
Gajim needs python-nbxmpp >= 0.6.1 to run. Quiting...........
wget https://downloads.linux.hpe.com/repo/spp/rhel/6/x86_64/current/CP017004.scexe
--2018-08-16 05:11:16-- https://downloads.linux.hpe.com/repo/spp/rhel/6/x86_64/current/CP017004.scexe
Resolving downloads.linux.hpe.com (downloads.linux.hpe.com)... 15.249.152.85
Connecting to downloads.linux.hpe.com (downloads.linux.hpe.com)|15.249.152.85|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1525561 (1.5........
sudo apt-get install hwloc-nox
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
hwloc-nox
0 upgraded, 1 newly installed, 0 to remove and 530 not upgraded.
Need to get 151 kB of archives.
After this operation, 453 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubunt........
Error 0 occurred while receiving the document
root@vh1:/var/tmp# wget http://mirror.compevo.com/proxmox/proxmox-ve_5.2-1.iso
--2018-08-30 16:27:37-- http://mirror.compevo.com/proxmox/proxmox-ve_5.2-1.iso
Resolving mirror.compevo.com (mirror.compevo.com)... 103.25.61.44
Connecting to mirror.compevo.com (mirror.compevo.com)|103.25.61.44|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 641517568 (612M) [application/o........
Your database uses Antelope as the file format. Full UTF-8 support in MySQL and MariaDB requires the Barracuda file format. Please switch to the Barracuda file format. See the documentation MySQL full unicode support for details.
In /etc/my.cnf under [mysqld]
180827 21:43:14 InnoDB: 5.5.59 started; log sequence number 1589339
180827 21:43:14 [ERROR] /usr/libexec/mysqld: unknown variable 'db_file_format=Ba........
[root@localhost:~] vmkping -I vmk1 10.0.2.69
PING 10.0.2.69 (10.0.2.69): 56 data bytes
sendto() failed (Host is down)
vsphere distributed switch vmotion not working
[root@localhost:~] esxcfg-route -l
VMkernel Routes:
Network Netmask Gateway Interface&........
You get errors like below and see you have all question marks for the permissions if you go to /run/user/1000/gvfs
If you try to access the mounted share such as anything mounted as gvfs like an SSH share in your file manager you may get an error like this. It generally means an interruption in communication or a fault with gvfsd has caused it.
Solutio........
This is not so much of a vi error as it is a physical filesystem error in the sense that the file you are trying to write to is a symlink and the destination doesn't exist or for some other reason is inacessible.
So vi is tellng you "you're writing to a symlinked file and the file the symlink points to cannot be written to". This is especially highlighted byt he fact that if you are using wq! to write and you still get the error.........
It could just be my specific Java but other KVM/IP works ok on my machine but with Supermicro's IPMI for some reason the console window doesn't resize and even putting it in full screen leaves the window cut off as shown below:
As you can see above the screen is cut off you can't see the "Iagree" on the right side.
The window resi........
zenity is a nice utility as part of the gnome window manager that allows you to script from bash and retrieve the input from the user. It could also be helpful in just notifying a user when they login with a popup window.
I'll give an overview of what's available with zenity:
Application Options:
--calendar Display calendar dialog
--entry Display tex........
Error reading from database
More information about this error
It is usually not possible to recover from errors triggered during installation, you may need to create a new database or use a different database prefix if you want to retry the installation.
Solution:
This happened when I was running MySQL 5.1. Assuming your database details are right and the DB is up then make sure you are usin........
Almost always the reason will be that the php.so file is missing but also that php.conf is misconfigured.
In the problem machine it is actually PHP7 installed so if you reference PHP5 of course things wil be broken!
Take for example here:
cat /etc/httpd/conf.d/php.conf
#
# PHP is an HTML-embedded scripting language which attempts to make it
# easy for developers to write dynamica........
Aug 13 13:46:33 s2sout2d45040 info Failed in all attempts to connect to proxy.eu.jabber.org
Aug 13 13:46:33 s2sout2d45040 info Sending error replies for 1 queued stanzas because of failed outgoing connection to proxy.eu.jabber.org
No clue why it tries to use a proxy not explicitly specified. This could be because the proxy specified for the domain fails when someone is trying to se........
[root@localhost:~]
BootModuleConfig.sh echo host-ind nfcd........
yes it does create its own json
============================================
cat /tmp/vcsaUiInstaller/ovftool-20180809-175238948-20180809-175603497.log |grep -i json
2018-08-09T17:56:04.238-07:00 verbose OVFTool[30966] [Originator@6876 sub=Default] Manifest file entry: SHA1(VMware-vCenter-Server-Appliance-6.7.0.12000-8832884_OVF10-file1.json) = 1deb658c724767697587d5909c4051c01813e6a1
--> ........
./tronwatch: error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory
[root@testing linux-unpacked-1.0.7]#
Solution:
yum -y install alsa-lib-devel........
The solution is just to install libmicrohttpd-dev
./xmr-stak
./xmr-stak: error while loading shared libraries: libmicrohttpd.so.10: cannot open shared object file: No such file or directory
libmicrohttpd
libmicrohttpd10 - library embedding HTTP server functionality
libmicrohttpd-dbg - library embedding HTTP server functionality (debug)
libmicrohttpd-dev - library embedding HTTP server functionality (development)
$ sudo apt-get i........
Aug 10 01:11:54 mailserver postfix/smtp[6180]: 020AE17C2BD1: to=, relay=none, delay=0.29, delays=0.28/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=gmail.con type=A: Host not found)
A user complained that their e-mails weren't being delivered but they actually made a small typo and used gmail.con so it wasn't working as expected of course........
sudo apt-get install libcurl4-openssl-dev git build-essential autotools-dev autoconf libcurl3
sudo apt-get install libcurl4-gnutls-dev
git clone https://github.com/wolf9466/cpuminer-multi
sudo apt-get install cmake libpthread-* libmicrohttpd-dev libssl-dev libhwloc-dev
git clone https://github.com/fireice-uk/xmr-stak-cpu.git
make install
cd bin
chmod +x xmr-stak-cpu
./xmr-stak -O xmr........
./nsgpucnminer: error while loading shared libraries: libOpenCL.so.1w: cannot open shared object file: No such file or directory
........
checking whether autoconf works... ../configure: line 5377: 7325 Segmentation fault $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1
no
configure: error:
*** These critical programs are missing or too old: gawk
*** Check the INSTALL file for required versions.
........
top - 13:02:52 up 603 days, 19:19, 2 users, load average: 5.01, 4.15, 3.44
Tasks: 604 total, 5 running, 599 sleeping, 0 stopped, 0 zombie
Cpu(s): 17.7%us, 36.1%sy, 0.0%ni, 42.0%id, 4.1%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 16278908k total, 4269684k used, 12009224k free, 119672k buffers
Swap: 8k total, ........
convert "file.TIF" "resize.jpg"
convert.im6: Unknown field with tag 317 (0x13d) encountered. `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/788.
I've been getting this error in ImageMagick on some .tif files even though it seems to actually convert properly.........
vzctl stop 4096
Removing stale lock file /vz/lock/4096.lck
Stopping container ...
Child 546213 exited with status 1
^Z
[1]+ Stopped vzctl stop 4096
~]# rm /vz/lock/4096.lck
rm: remove regular file `/vz/lock/4096.lck'? y
~]# vzctl stop 4096
Stopping container ...
Child 546246 exited with status 1........
[root@thetor2017 conf]# service httpd restart
Stopping httpd: [ OK ]
Starting httpd: WARNING: MaxClients of 3000 exceeds ServerLimit value of 300 servers,
lowering MaxClients to 300. To increase........
INFO [07-19|12:11:51] Imported new block receipts count=590 elapsed=8.440s bytes=74117699 number=4870906 hash=6bc60b…934753 ignored=0
INFO [07-19|12:11:57] Imported new state entries count=499 elapsed=9.963ms processed=71076 pending=1526 retry=2&nbs........
This is often the result of PayPal's "item name" or another name having invalid characters or not supporting Unicode.
173.0.81.1 - - [17/Jul/2018:13:39:45 -0400] "POST //modules/gateways/callback/paypal.php HTTP/1.1" 406 - "-" "PayPal IPN ( https://www.paypal.com/ipn )"
A good clue is if you check the debug output of the IPNand find a mandatory column empty.
........
Server Side Config
1.) First install nfs-utils
yum -y install nfs-utils
2.) Configure nfs share
Create a directory for your NFS share
mkdir /datastore
Create your NFS share in /etc/exports
echo "/datastore 10.220.101.0/24(rw,sync,no_root_squash)" >> /etc/exports
systemctl restart nfs........
Ialready have the caja-image-converter option installed but it shows nothing.
Weirdly enough if you install nemo and nautilus converter it does show and work inside caja:
The solution is to install *-image-converter
sudo apt-get install *-image-converter
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'n........
A very handy feature of ImageMagick's convert command is that it can convert PDF's to other image formats like jpg but did you know you can even manually select a range or specific pages from the PDF?
Here is an example of converting a range of pages from a PDF in this case pages 25 to 36:
convert -density 300 "vSphere 6.5-1.pdf[25-36]" vsphere.jpg
Here is an example of converti........
You can search for this bug and it seems like it may be related to ecryptfs and is many years old.
The symptoms are that you return to the computer and the screensaver was active or the screen was asleep/black and it doesn't seem to come back. But you check by SSH the computer is running fine and are frustrated you'll lose your running programs and have to reboot.
There is a simple solution:
Ctrl + Alt + F1
Ctrl +Alt + F8
Ba........
Ithought I'd post this becuase there is some bad information out there. Some guides tell you to edit /etc/postfix/master.cf (-o smtp_bind_address=) but this doesn't work. The same guide also says if you don't change it there you end up changing the listening IP/bind interface which is also not true.
Here is a simple and effective way to change Postfix's sending/binding/outgoing IP address (very important for reverse DNS and so mail servers don't block you)........
I've read a few guides about this but they didn't work for me.
sudo apt-get install bridge-utils
#don't think the above is enough it won't work still even though you have by default an /etc/qemu-ifup that handles it if you have the right tools and setup
sudo qemu-system-x86_64 -net tap -net nic -enable-kvm -cpu host,vmx=on ~/VirtualBox VMs/vsphere-vcenter/vsphere-vcenter.vdi
W: /etc/qemu-ifup: no bridge for guest interface foun........
I can't get vmx cpu extensions to show up in Virtualbox guests despite enabling nested paging and
enable vmx in virtualbox guest but this doesn't help that you check VT-X or the AMD Virtualization SVM it enables it for the guest to use BUT does not pass it through. This means if you check cat /proc/cpuinfo in the guest you will see the CPUdoesn't support virtualization. It looks like VirtualBox still hasn't implemented this!
But there is good news I&n........
InternalServerError (com.vmware.vapi.std.errors.internal_server_error) => {
messages = [LocalizableMessage (com.vmware.vapi.std.localizable_message) => {
id = vapi.bindings.method.impl.unexpected,
defaultMessage = Provider method implementation threw unexpected exception: com.vmware.vapi.std.errors.InternalServerError,
args = [com.vmware.vapi.std.errors.InternalServerError]
}],
data =
}
I was getting the........
Intel VT-X is enabled in Virtualbox but it doesn't seem to pass through the needed vmx extension despite the following variables on the host confirming it is enabled:
cat /sys/module/kvm_intel/parameters/nested
Y
cat /sys/module/kvm_intel/parameters/ept
Y
OVF Tool: Disk progress: 99%
OVF Tool: Transfer Completed
OVF Tool: Powering on VM: Embedded-vCenter-Server-Appliance-
OVF Tool: Task p........
I had this error in an unsupported CPUon VMWare 6.7 and apparently this sometimes works especially on older VMWare versions like 6.5 5.5 etc (but in my case it did not).
To make sure it proceed when you see "Loading VMWare"
Hit "Shift+O"
Then add "ignoreHeadless=TRUE"
See an example below:........
#mount the VCSA DVD
mount /dev/sr0 /mnt/cd
#alternatively you could mount the iso directly
mount -o loop vcsa.iso /your/mount/path
#for this purpose we are using the CLI installer on Linux
cd /mnt/cd/vcsa-cli-installer/lin64
#no it's not going to be that easy you can't just run vcsa-deploy like that you need to use a template or configured .json file
./vcsa-deploy
Usage: vcsa-deploy [-h] [--version] [--supported-deploymen........
10/07/2018 03:05:14 PM [IPv4] Got connection from client10.10.25.1
10/07/2018 03:05:14 PM other clients:
10/07/2018 03:05:14 PM Client Protocol Version 3.7
10/07/2018 03:05:14 PM Advertising security type 18
10/07/2018 03:05:14 PM Client returned security type 18
10/07/2018 03:05:14 PM TLS Handshake failed: Could not negotiate a supported cipher suite.
10/07/2018 03:05:14 PM Client10.10.25.1 gone
10/07/2018 03:05:14 PM Statistics:........
Starting with newer versions of OpenVPN Ibelieve 2.2+ you need to have "script-security 3" set or you can't execute a third party script.
Prior to that you could also use the auth-user-pass-verify like this:
auth-user-pass-verify ./validate.pl "$username $password $ip" via-env
Options error: the --auth-user-pass-verify directive should have at most 2 parameters. To pass a list of arguments as one of the paramete........
This basically means that you are running as non-root and you need to be root to create the tun0 or tap0 device on OpenVPN. You could try sudo or adding the openvpn binary to the list of sudoers.........
The main issue is it looks like Java is not configured to accept the invalid ssl cert that is coming from the download location.
Exception in thread "main" java.lang.RuntimeException: javax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error
export ANDROID_HOME=/home/user/Downloads/tools/
Conversations-master$ ./gradlew
Downloading https://services.gradle.org/distributions/grad........
This is most likely to happen on a normal GUI system like Ubuntu or Linux Mint. If you or the user is meant to have sudo / root privileges it is as simple as editing the following files:
Now assume your username is "iamtheuser"
vi /etc/group
adm:x:4:syslog,iamtheuser
sudo:x:27:anotheruser,iamtheuser
Find the above lines and add a comma and "ia........
Database Error
One or more of the WHMCS database tables appear to be either missing or corrupted. Please check and repair.
This error can be misleading especially if you know you are using a known good backup or restoration of the WHMCS database. The error can also be that the user lacks permissions to read and write to the database.
To check to this in MySQL shell:
GRANT read,write to dbusername@localhost on dbna........
Jul 3 22:12:17mailserver postfix/smtpd[6195]: fatal: no SASL authentication mechanisms
Jul 3 22:12:18mailserver postfix/master[4881]: warning: process /usr/libexec/postfix/smtpd pid 6195 exit status 1
Jul 3 22:12:18mailserver postfix/master[4881]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
This only ever happens in my experience when the authentication method is actually Dovecot. Usually the problem........
A simple way that may work for a lot of people who just need basic output for their scripts or daemons to announce an action is this:
echo "body or message" | mail -s "realtechtalk.com" user@domain.com
If you want to send a text file as the body just do this instead:
mail -s "realtechtalk.com" user@domain.com < /tmp/sometxtfile.txt
These are some ve........
Centos when copying old files and restarting it seems load everything fine and then says [FAILED] with no log or other message.
service restart named
named [FAILED]
Check more thoroughly you may have missed the error if you have lots of zones!
service named restart|grep error
zone 1.168.192.in-addr.arpa/IN: not loaded due to errors.
zone 2.168.192.in-addr.arpa/IN: no........
Sometimes if you have a very basic configuration OpenVPN on the client side for some reason sends all traffic to the OpenVPN server IP through the tun0 which is of course impossible and creates a block or routing loop.
This is because you need to use your normal ISP/LANgateway to hit the OpenVPN server if it is remote/offsite as is usually the case. So if you are connected to the OpenVPN through say a tun0 device and your routing is set to connect to the OpenVPN&nbs........
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Apache/2.2.15 (CentOS) Server at testdomain.com Port 80........
This is not the normal "black screen"issue and I was shocked to eventually find out why. The normal advice of reconfiguring Xorg didn't work. Even booting into "Recovery Mode" did not help.
Here is the short end of the stick that fixed it:
sudo apt-get install mdm mate-desktop-environment
Yes you got it right, mdm and the mate-desktop-environment / gnome were somehow uninstalled. This must be whe........
This usually happens when you are using something like an INT and try to insert a larger valuethan the maximum which is larger than "2147483647"
On a practical term I have seen this and been guilty of this error when using scripts like PHPand generating large random numbers:
$hash = mt_rand(5,9999999999999);
Obviously that many 9's are more digits than the maximum of an INT resulting in that error. Change your code accord........
ValueError: new value non-existent xfs filesystem is not valid as a default fs type
Pane is dead
From what Iread this is misleading and has to do with the fact that the initrd and kernel are mismatched.
This is a hard situation because for some older hardware Iam using the Centos Plus kernel which has modules that Irequire for an older server/NIC. This seems to have cropped up in the past few months and there is no simple fix........
It looks like this has something to do with APIC but I am not sure. I have similar CPUs with a different MB and BIOS that work fine on the same type of kernel. A lot of time the issue is because of the C-step setting in the BIOS.
The same thing happened on the 2.6 kernel with Centos 6 but this is a homebrew 4.4 kernel soI am not sure why it is happening when even Centos 7 (3.2) kernel works OK.
Solution - It comes down to the BIOS set........
So you restarted your router/dhcpd server or for some other reason you wonder why DHCP is not working on any of your clients?You go and check that named is in fact running fine.
But then you check /var/log/messages and see this error for everything hostname:
named[1525]: error (broken trust chain) resolving 'min-api.cryptocompare.com/A/IN': 173.245.58.78#53
I've only ever seen this when the time on the server was off. It........
In xplayer Iget the following error "Could not initialize supporting library.". It actually looks more like a gstreamer issue.
For those wondering what the default video player is called it is "xvid" and not "totem" anymore like previous versions.
Basically it looks like some codecs are missing when I uninstalled another program it uninstalled other programs and codecs that it shouldn't have.
I've tried installing all the gstre........
This is useful if you have a bunch of images/scans where the same area at the top needs to be chopped.
Sometimes the -trim option (such as the case of white space on top)is wrong and ends up cropping the image and losing some text.
ImageMagick's convert is very useful but tricky to find some things out as I find it to be less than intuitive sometimes.
Chopping off the bottom
convert -crop -0-400 image.jpg image.pdf........
It is well known hackers, the NSA, CIA and other groups have created malware to secretly turn on your webcam and microphone on your phone, tv etc.. But fortunately on our computers and laptops we have some options.
Most webcams use the "uvcvideo" kernel module / driver. You can disable this in two ways on boot. I recommend both just as a failsafe.
Disable it on rc.local once your system boots automatically
Add the followi........
In at least Ubuntu and Mint there is nothing intuitive about configuring Java.
Execute it to get to it:
itweb-settings
You'll be able to configure different options and variables.
You can also check under Security as some of those settings could prevent applets from starting or prompting to........
sudo chmod 000 /etc/cron.daily/apt-compat
This is the easiest way to disable the cron without anything more invasive like deleting the file.
After that you won't have anymore apt-get's starting.
This can be critical for systems without much extra RAMthat is not in use. I've seen systems that have swapped and crashed over apt-get.........
One simple way to keep your server public but almost impossible to hack via SSHis to disable password authentication over SSH. This means the only way in is via your own private key that only you should have.
Edit your /etc/ssh/sshd.conf file
Set this option
PasswordAuthentication no
Restart your SSH server.
service sshd restart
........
This is one thing that has me wondering about SMF. It is apparently a known issue but in the latest version and new install nothing looked right because it was using http://127.0.0.1 to find everything! How on earth would it ever do this or think it is normal?
Excerpt of crazy html code it produces that causes the issue:
........
GRANT SELECT, LOCK TABLES ON *.* TO yourmysqluser@localhost;
All you need to do a full MySQL dump on all databases is the SELECT and LOCK TABLES privileges. This way you don't have to use the mysql root user. Data could be compromised this way but at least no harm from manipulation, changes or deletion are possible by locking down the privileges to the minimum for a full MySQL dump and backup.........
Starting container...
vzquota : (error) Quota on syscall for id 4532: No such file or directory
vzquota on failed [3]
Solution
vzquota drop 4532
Then start the container and it should work. It actually happened after migrating the VPS manually to ano........
So I have a domain "testdomain.com".
Inside test domain.com's root is the following .htaccess:
Options +FollowSymLinks -Indexes
ErrorDocument 403 /launch/index.html
Order Deny,Allow
Deny From All
Allow From 192.168.1.2
When you visit anything other than root things work fine. Eg. if you visit http://testdomain.com/somedirfile.html
It will show the right error in /launch/........
It has been a big pain for a long-time to install Windows from a Linux environment. I used to run a windows install server and it never worked right for some reason (the install would fail on most servers).
Before getting start be sure to setup your samba share so once you boot into WinPE you can mount the install for whatever Windows you want
/etc/samba/smb.conf
[smbwinstall]
path = /tftpboot/images/winstall
guest ok = yes........
Error: Unable to apply new quota values: quota not running
Container start failed (try to check kernel messages, e.g. "dmesg | tail")
Killing container ...
Container was stopped
Error: Unable to apply new quota values: quota not running
Can't umount /vz/private/123123: Invalid argument
[root@rtt 123123]# vzquota on 123123
vzquota : (error) Can't open quota file for id 123123, maybe you need to reinit........
curl: (35) Unknown SSL protocol error in connection
The main solution is to update curl and nss. If you are having an issue with curl through Apache/PHPyou will need to restart PHPafter.
It's important to remember that this error could mean a lot of things but most often it simply means that curl and openssl may be outdated and only allow newer secure ways of connecting to SSL.
In general here is how you would fix it in most c........
I modified this code after quickly learning how Wordpress plugins actually work, how they're called etc.. was the first trick to modifying the code to add tags.
Add this code after line 570 in wp-content/plugins/wp-instagram-post/classes/class-woo-igp.php
&nb........
Some of the cheaper or newer SSL suppliers will require this to work properly (otherwise you may be prompted that the cert is invalid when it's not the case but it will certainly scare off your users!).
In the Apache vhost conf for the domain here is what you add:
SSLCACertificateFile /path/to/your/cafile.pem
Here is a full example of an SSL Vhost config in Apache using a CA Certificate file
........
PHP Warning: Cannot load module 'XCache' because conflicting module 'apc' is already loaded in Unknown on line 0
Solution:
yum remove php-pecl-apc-*........
Getting this error on Centos 6 with PHP 5.3 when just running "php -v"
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/module.so' - /usr/lib64/php/modules/module.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning: Cannot load module 'XCache' because conflicting module 'apc' is already loaded in Unknown on line 0
Solution:........
It takes some tinkering the main thing is that the "-dmS" flag allows screen to start without a session which of course sudo won't have.
solution:
/usr/bin/sudo -u user /usr/bin/screen -dmS nameyouchoose /script/start.bash
this doesn't work at all:
/usr/bin/sudo -u user "/usr/bin/screen /script/s........
The easiest way is to use SSHand DD or a combination of netcat. SSHwill be a little slower due to encryption but is the most secure way (on two older systems the average clone speed is about 40-50MB/s). This is also OS independent as it doesn't matter what the source OS is because you are literallly cloning the drive so you retain the partition table and settings.
Clone HDD using SSH and DD........
I don't recall having this issue in the distant past but nowadays at least Debian seems to be very picky about this.
I used dd to copy one hard drive to another and tried booting it. Everything seemed fine with grub working but each time it would drop to the busybox shell. There is no particular error so this is misleading.
Normally the first things you would check are to make sure your fstab is correct (that the UUID is correct)and that you've updated grub.&........
ssh rtt@192.168.1.199
Unable to negotiate with 192.168.1.99 port 22: no matching host key type found. Their offer: ssh-dss
It looks like the DSS option is not considered secure so when connecting from newer Linux systems to an older one you will get the above error.
It can be fixed (but you should consider upgrading your SSH daemon):
ssh -oHostKeyAlgorithms=+ssh-dss rtt@192.168.1.199........
This guide will work for most modern Linux versions like Centos RHEL 7, Debian, Mint, Ubuntu etc...
In Centos 7 the days of editing the "kernel"line and adding "single"are gone. On top of that sometimes after a new install passwords do not work, maybe you forgot your password or for some other reason you need to break in or fix your system? It could also be because you can't mount your root / or some other /etc/fstab error and many other err........
ALTER TABLE existingtable ADD newfieldname VARCHAR(255);........
MySQL will silently truncate a larger INT than capable.
Check MySQL's own documentation here:
As we can see the maximum size of INT (which is the most commonly used) is 2147483647
A lot of coders make this mistake by using very large values such as 9999999999 but it would actually truncate to 2147483647 which is the maximum size of an INT. This is dangerous beca........
ALTER TABLE thetable ADD newfield VARCHAR(255)
It's very simple just specify "the table" and then the newfield type........
order deny,allow
Deny From All
Allow From 8.8.8.8
A simple and quick way to improve security by only allowing specific IPs to your web application.
In this case the above allows only the IP 8.8.8.8 to access things and everything else is denied.........
Stopping httpd: [ OK ]
Starting httpd: httpd: Syntax error on line 221 of /etc/httpd/conf/httpd.conf: Syntax error on line 6 of /etc/httpd/conf.d/php.conf: Cannot load /etc/httpd/modules/libphp5.so into server: /etc/h........
Install requirements:
yum -y install gmp-devel mpfr-devel libmpc-devel glibc-devel glibc-devel.i686 zip unzip jar
Download, untar, configure, compile and install GCC
http://mirrors.kernel.org/gnu/gcc/gcc-5.5.0/gcc-5.5.0.tar.gz
tar -zxvf gcc-5.5.0.tar.gz
cd gcc-5.5.0
./configure
make
make install
Now you need to cleanup th........
The Linux Kernel interpretated a very high volume of real traffic as a DDOS attack so it basically ends up blocking your web server.
possible SYN flooding on ctid 42131, port 80. Sending cookies.
Simple fix edit sysctl values for max_syn_backlog
sysctl -w net.ipv4.tcp_max_syn_backlog=5000
To make them permanent edit /etc/sysctl.conf
echo "net.ipv4.tcp_........
By default Samba SMB/NMB listen on ANY and ALLIPs on your system by binding to 0.0.0.0. Obviously this is a huge security risk if you have a public facing server with both internal and external access. Usually when a system administrator sets up a samba server their intention is just to share with a LAN.
To do this you need to the following options under the [global] section in smb.conf
bind interfaces only = yes
interfaces = 192........
tftp: client does not accept options
I spent the good portion of a late evening on this double checking settings that I know always worked right for tftp!
This error can also happen if you are trying to boot PXE in UEFImode. Enter your BIOS and change it to "Legacy PXE" or non-UEFI PXE mode and you'll be good to go!........
This works with lspci and if it's outdated may not give you the exact manufacturer and device model.
For example take these 3 different RX 580's:
1a:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev e7)
1b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev e7)
1d:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev e7)
You ca........
pcimodules no longer works it produces nothing probably because the format of /sys/bus/pci is different.
lspci -k doesn't work on older lspci versions.
pciutils can be compiled but it won't work if you have an old system and compile on a newer glibc.
iteriate through /sys/bus/pci/devices/*/modalias
cat /sys/bus/pci/devices/*/modalias
pci:v00008086d00001237sv00000000sd00000000bc06sc00i00
pci:v00008086d00007000sv0000000........
This is not just a Linux issue but a general issue most software or hardware players cannot play the resulting exported/backed up format of .h264 from DVR security camera footage for some silly reason.
There is a simple solution in Linux using ffmpeg fortunately.
Convert the .h264 file into mp4
ffmpeg -i yourfile.h264 -codec copy video.mp4
play dvr .h264 file........
It's really simple and just a matter of the following line within the subnet declaration.
deny unknown-clients;
See example below:
subnet 10.25.20.0 netmask 255.255.255.0 {
range 10.25.20.11 10.25.20.254;
deny unknown-clients;
option routers 10.25.20.10;
option domain-name-servers 208.67.222.222;
 ........
In Thunderbird in a very large folder suddenly all of my e-mail list became blank/white even though you could click on the invisible/white/blank lines and it would show the e-mails. Itried to close and reopen but only going to Folder -> Properties and clicking Repair Folder fixed it (basically it had to redownload/rebuild the entire index and all e-mails).........
This is important as unfortunately Centos may designate a package obsolete and the replacement breaks everything (eg. you have a config file and the new replacement is not at all compatible with it and it breaks your application).
This is where disabling obsoletes comes into play, it can be done from yum but it doesn't work at the time I find.
yum --setopt=obsoletes=0 install someapp However Ifind it still installs the new app and not the one you ask for........
Upgrading from PHP 5.3 to 5.4+ there are many challenges basic things like mysql_connect() do not work anymore.........
I'm having trouble making it work on very shaky video the result seems kind of warped/blurry/fish eye like and not as good as some other examples I've seen:
ffmpeg -i MVI_1285.MOV -vf vidstabdetect=shakiness=10:accuracy=15 -f null MVI_1285.trf
ffmpeg -i MVI_1285.MOV -vf vidstabtransform=smoothing=30:input="transforms.trf" MVI_1285.MOV.mp4
I've played around with the shakiness, accuracy etc.. but not the smoothing part.........
You are using Centos 5 which is deprecated so nothing in yum will work until you follow this post to use the vault:
http://realtechtalk.com/Centos_59_Working_Vault_Repo_file-1921-articles
yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* epel: fedora-archive.ip-connect.vn.ua
Traceback........
[Wed Sep 20 15:34:44 2017] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Wed Sep 20 15:34:44 2017] [error] Init: Unable to read server certificate from file /www/ssl-certs/server.crt
[Wed Sep 20 15:34:44 2017] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
[Wed Sep 20 15:34:44 2017] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error........
This through me for a loop when I would do a cp -rf or mv -f nothing would get overwritten even if piping y or yes to the command.
Type alias and you'll see why:
alias cp='cp -i'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'
The -i is a safeguard against messing things up but however does mess things up worse when you know what........
The code may lead you to believe you have an incompatible template but if you are not trying to use an old template currently that is not the issue. I actually deleted all 3.x style templates to make sure.
What the issue is, is old plugins that are not compatible but Vbulletin does not seem to account for this except that you'll see a fatal PHPerror. You should disable all plugins and then enable one by one until you find the one that is causing the issue.
&........
iptables -t NAT -A PREROUTING -s 24.30.44.0/24 -j DNAT --to-destination 10.10.10.1
iptables v1.4.7: can't initialize iptables table `NAT': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
Solution
# it is case sensitive "nat" and DO NOT use "NAT" or you will get this error!
iptables -t nat -A PREROUTING -s 24.30.44.0/24 -j DNAT --to-destination 10.10.10.1........
I have never had this error on Linux and this is running FreeBSD as root:
Wed Aug 9 04:29:34 2017 us=329050 Cannot allocate TUN/TAP dev dynamically
Wed Aug 9 04:29:34 2017 us=329832 Exiting due to fatal error
The Solution you need a kernel module that is for some reason not automatically loaded like Linux:
kldload if_tap........
This happens if you are running a kdenlive script from the shell of a remote machine without using SSH "-X" forwarding and it will also cause any areas where you write text to be a white screen for that duration.
melt FusionFestival.kdenlive
No LADSPA plugins were found!
Check your LADSPA_PATH environment variable.
[producer_xml] failed to load transition "qtblend"
[producer_xml] failed to load transition &q........
virt-list-partitions kvmusertest.img
/usr/bin/supermin-helper exited with error status 1.
To see full error messages you may need to enable debugging.
See http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs at /usr/bin/virt-list-partitions line 177.
#solution
update-guestfs-appliance........
sudo mount -a
Unable to find suitable address.
[35758.706993] CIFS VFS: Error connecting to socket. Aborting operation.
[35758.707247] CIFS VFS: cifs_mount failed w/return code = -111
[35795.476160] CIFS VFS: Error connecting to socket. Aborting operation.
[35795.476346] CIFS VFS: cifs_mount failed w/return code = -111
When the above happens "Unable eto find suitable address" it usually means the smb nam........
Sep 12 18:16:25 vps pluto[7299]: ERROR: asynchronous network error report on eth0 (sport=500) for message to 192.5.6.2 port 20640, complainant 192.5.6.2: Connection refused [errno 111, origin ICMP type 3 code 3 (not authenticated)]
Some say changing the "leftprotoport=17/%any" will fix this but I have not found this to be the case.
Essentially it means at least one end is blocking the ipsec packets. Sometimes the %any allows an alt........
Centos 5 is not supported running yum will produce an error like this:
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base
Solution - Update this file CentOS-Base.repo
# CentOS-Base.repo........
A great way when moving your equipment to a new location, new router/switch etc to help confirm what MAC has what IP:
for ip in `arp -na|awk '{print $2}'|sed s/(//g|sed s/)//g`; do
echo ping $ip
ping -c 1 -w 1 $ip > /dev/null
if [ "$?" == 0 ]; then
echo "$ip UP"
fi
done........
Iam not sure why this is happening neither the hostnode or VM changed. All I did was reboot the hostnode and startup the Centos VM again, also note it happened with the original kernel on the VM and also the latest 6.9 kernel as of this writing as shown below.
Host Node: Centos 6.9
Kernel:2.6.32-696.6.3.el6.x86_64
Kernel: 2.6.32-042stab123.9
Same result in any kernel above........
I have never had this error on Linux and this is running FreeBSD as root:
Wed Aug 9 04:29:34 2017 us=329050 Cannot allocate TUN/TAP dev dynamically
Wed Aug 9 04:29:34 2017 us=329832 Exiting due to fatal error
The Solution
You need a kernel module that is for some reason not automatically loaded like Linux:
kldload if_tap........
Intel NUC J3455 vs Vorke V1 J3160
Both are excellent units but the J3160 is nicer if you require even lower power usage (6W vs the Intel 10W). The price is attractive on the Vorke V1 as well. It's been said that the Intel J3455 NUC has a buggy BIOS and some other issues that require attention.
The Intel J3455 is still nice because it has 2 RAMslots but it does get hotter due to lack of fan.
The Vorke V1 runs cooler, uses less power an........
This is an important feature a failed read can genuinely occur if a temporary file has been removed or if you try backing up a sysetm file in /proc /sys (which you shouldn't really anyway).
The way to fix this is the following switch:
--ignore-failed-read
Example:
sudo tar --ignore-failed-read -czvf mycomputer-backup.tar.gz --exclude=/home/otheruser/* --exclude=/proc/* --e........
When using the .sh script the rendering doesn't work after an upgrade of related packages to kdenlive.
kdenlive (kdenlive:amd64 (4:17.04.1+git201705191233~ubuntu16.04.1)) with affine or composite transitions was fine but is now broken during the time of transition it is just a white screen.
The previous version was fine:
kdenlive:amd64 (4:17.04.1+git201705191233~ubuntu16.04.1
But now I can't find it or install it:........
[1035724.274610] [drm:intel_pipe_update_end [i915_bpo]] *ERROR* Atomic update failure on pipe A (start=62076478 end=62076479) time 102 us, min 894, max 899, scanline start 893, end 900
W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1.bin for module i915_bpo
I've been getting those errors on a J3455 NUC box with the latest kernel on Linux Mint 18.2. When updating the initramfs I also got the error about the firmware........
If you were in my boat you were frustrated that you had to double encode, eg. one separate encode for watermark and a separate from concat and it's not easy to figure out this with ffmpeg on your own. However it is a nice way to save time!
ffmpeg -i file1.mp4 -i file2.mp4 -i file3.mp4 -i watermark.png -filter_complex "[0:v]setpts=PTS-STARTPTS[v0]; [1:v]setpts=PTS-STARTPTS[v1]; [2:v]setpts=PTS-STARTPTS[v2]; [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][aout]; [v][3:........
Solution:
Aptitude is very smart and fixed the issues it was because of nvidia cuda and opencl and nothing else suggested or hinted this using apt
sudo aptitude install wine
The following NEW packages will be installed:
ocl-icd-libopencl1{ab} ocl-icd-libopencl1:i386{ab} wine wine1.6
wine1.6-amd64{a} wine1.6-i386:i386{a}
The following packages will be REMOVED:........
When things go wrong your video is basically unplayable or the first video plays fine and then freezes when moving on to the next. Generally if both videos weren't produced with the exact 100% same settings you will have issues. You can try the basic concat but it often won't work right.
Solution for me:
My example uses 3 videos in total so "n=3" and a=1 to include audio.
ffmpeg -threads 12 -i file1.mp4 -........
I believe from what I've read that this card's driver doesn't support the features after trying all known troubleshooting methods.
ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload -c:v hevc_nvenc -profile main -preset slow -rc vbr_hq -c:a copy uservideoRendered.mp4-test
ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload........
Essentially a program I was running for mining did not terminate properly with Ctrl+C it is listed as defunct and cannot be killed, kernel is tainted and normal tricks to disable the port are impossible the dev and sys entries for the device cannot be browsed or interacted with in any form without a lockup of the request. The only solution is to reboot due to the kernel taint as far as I can find so far.
[1130246.811056] INFO: task minerd:21861 blocked for more th........
#if you have nvidia make sure you install the nvidia-cuda-toolkit so hardware acceleration can be used
wget http://ffmpeg.org/releases/ffmpeg-3.3.2.tar.bz2
tar -jxvf ffmpeg-3.3.2.tar.bz2
cd ffmpeg-3.3.2/
./configure --disable-yasm
install prefix /usr/local
source path ........
This container won't start after exhausting its memory. There are no relevant or helpful messages in dmesg or vzctl.log as well. Standard troubleshooting such as disabling PPP etc has not helped.
2017-07-06T23:33:29-0400 vzctl : CT 888171 : Locked by: pid 166029, cmdline vzctl start 888171
2017-07-06T23:33:29-0400 vzctl : CT 888171 : Container already locked
2017-07-06T23:33:29-0400 vzctl : CT 888171 : Container was stopped
2017-07........
Done on Centos 7.3 very important as clearly based on older guides it was a lot easier and more simpler! Hint do not use grub2-install!
If you have trouble booting after this check this CentOS mdadm RAID booting/fixing guide.
One huge caveat if you are an oldschool user or sysadmin who has avoided UEFIbooting
The nor........
Still looking for the solution
Working Solution 2017/07
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D46F45428842CE5E
Solution
gpg --keyserver hkp://subkeys.pgp.net --recv-keys D46F45428842CE5E
gpg: requesting key 8842CE5E from hkp server subkeys.pgp.net
gpg: keyserver timed out
gpg: keyserver........
This is a 8TB Seagate external USB 3.0 device apparently newer kernels use a module called "UAS" instead of "USB Storage" which causes issues as a lot of devices are not properly supported in UAS mode by the kernel driver. The solution some say is to disable UAS specifically for your USB device but I'd rather just disable UAS altogether.
Solution blacklist UAS: *do not do this it does not work and just causes your USB 3.0........
I am using a GTX 1060 but replace the download for the driver with the correct/current version for your particular card by visiting: http://www.nvidia.com/Download/index.aspx?lang=en-us
yum install automake curl openssl-devel libcurl-devel gcc gcc-c++
yum -y install kernel-devel-`uname -r`
yum -y install unzip
#the........
This is a VIA made VL805 USB 3.0 Chipset with 4-ports and MOLEX powered. First of all this unit was cheap at about only 9 USD with fast shipping. My biggest concern was if this was a quality unit and would it really give you full USB 3.0 speeds (some people reported with similar cards that for some weird r........
This is a common issue, what if a issue shouldn't have root but you want to use that user to make a full backup of a system? They of course need root access.
You can actually just give them passwordless sudo access to rsync in /etc/sudoers:
sudo vi /etc/sudoers
yourusername ALL = NOPASSWD: /usr/bin/rsync
Here is how you would execute rsync:
The key thing for the remote host is to........
When running cudaminer once it tries to initialize the card the entire screen freezes. The computer itself is still running but the Xorg is done for, you cannot even switch to another console window and must reboot (even an mdm or Xorg restart does not help).
At first cudaminer will give you these errors:
stratrum_recv_line failed
...retry after 15 seconds
GPU #0: Geforce 210 with compute ca........
sudo mkdir -p /etc/X11/xorg.conf.d/
sudo vi /etc/X11/xorg.conf.d/20-intel.conf
On newer Ubuntu / Mint / Debian systems the file would go in: /usr/share/X11/xorg.conf.d/20-intel.conf
Type "i" and enter the following:
Section "Device"
Identifier "Intel Graphics"
Driver&n........
**** Warning: can't process font stream, loading font by the name.
Can't find CMap Identity-UTF16-H building a CIDDecoding resource.
Warning: falling back to Identity ordering
**** Error reading a content stream. The page may be incomplete.
**** File did not complete the page properly and may be damaged.
**** This file had errors that were repaired or ignored.
****........
Here is a simple MP3 player and now there's a reason to understand why the supplied cable has some kind of capacitor and is very short. These devices can be VERY finicky and any voltage fluctuation or difference is enough to cause issues.
Take for example the error messages from Linux Mint:
[804829.895414] usb 1-1: USB disconnect, device number 11
[806961.109030] usb 1-1: new high-speed USB device number 12 using xhci_hcd........
This is mainly the case on Centos but applies to other distros and situations. If you are running programs in the background with the &, at least in Centos it is usually not honored and if you quit or are disconnected the backgrounded programs will be sent sighup and be shut down.
The simplest way around this instead of using & is to start any programs or commands with "nohup"
Eg.
nohup yourscript.sh........
Finally after ages I found the solution which is on many pages on the net but not obvious and should have been standard or more common info!
Instant Solution:
Type this into the terminal (unfortunately the driver config menu doesn't have the option as itis hidden):
nvidia-settings --assign CurrentMetaMode="nvidia-auto-select +0+0 { ForceCompositionPipeline = On }"
Make permanent
Cli........
Jun 1 15:45:42 videoeditor-desktop org.mate.panel.applet.MintMenuAppletFactory[1882]: project_data:INFO Missing folder chosen by user:
Jun 1 15:45:42 videoeditor-desktop org.mate.panel.applet.MintMenuAppletFactory[1882]: project_data:INFO Removed missing file: MAH02949.MP4
Jun 1 15:45:57 videoeditor-desktop org.mate.panel.applet.MintMenuAppletFactory[1882]: ui_util:WARNING Icon theme media-playback-start not found. Will use backup........
I was sure this was a Centos bug with OpenSSL, Apache, MySQL or even PHP. I tried everything but nothing helped. One clue is that if you check the Apache logs you will see nothing in the access logs until minutes later (this means Firefox has not even passed your request to the remote Apache/htttpd server).
When even accepting the invalid certificate message that would show up minutes later when trying to "View the Certificate" Firefox would freeze. This bu........
These errors believe it or not are simply because of not being the root user or running with sudo! However if you didn't know to try as root you'd think there was a problem with your burner or disc Essentially it looks like without root you cannot send the required scsi commands to continue writing. Ithink cdrecord should have built-in tests or safeguards to see if it has the permissions to run the required commands.
I guess for more advanced users the idea is simila........
I get the following error "Installer Crashed" on 18.1 MATE 64-bit when installing by NFS/PXE. Yet it was able to at least detect and use my NIC (perhaps the driver was only activated because of PXE/NFS being used)?
When using 18.1 Cinnamon on CD the NIC does not work but the installer did succeed. However it doesn't work right, I can't login graphically and get some Cinnamon OOMerror but how can this be with 8GB of RAM straight from login?........
Just make sure you have php-xdebug installed and edit your php.ini:
[xdebug]
xdebug.profiler_enable = 0
xdebug.profiler_enable_trigger = 1
xdebug.profiler_output_dir = "/tmp/xdebug/"
xdebug.output_name = "cachegrind.out.%t-%s"
Also make and set permissions on /tmp/xdebug:
mkdir /tmp/xdebug
chmod 777 /tmp/xdeb........
Just type the following in the bash/terminal shell to enable the blue LED light on the Coolermaster CM Storm keyboard:
xset led 3
To make it automatic and permanent execute the following as root:
echo "xset led 3" >> /etc/rc.local
This is a fairly nice gaming keyboard whichI bought because I type very quickly and the cheap standard keyboards simply can't keep up!........
This happens on any file an even just typing "vi"whereas it never happened before. I suspect an update or environment variable is causing this issue
When entering vi I get this weird stuff
line 58:
E488: Trailing characters: t_Sbet
line 63:
E171: Missing :endif
When exiting vi I get this weird stuff
t_Sb=^[[4%?%p1%{1}%=%t........
Error while connecting to MYSQL: (XID 4ea7s9) Access denied for user 'root'@'localhost' (using password: YES) at /usr/local/cpanel/Cpanel/Mysql.pm line 181
Solution
This error occurs because the /root/.my.cnf has the wrong/outdated password for MySQL root user. Simply edit /root/.my.cnf with the correct user. This normally happens if you update outside of cPanel.........
1.) gedit/pluma
both very good the only thing I wish is that there was an autosave for unsaved documents! The only other competitor which is similar but I prefer less is kwrite (although I think kwrite may have proper autosave)
pluma seems to be a renamed gedit yet gedit is still installable on Linux Mint)
........
Normally the below would indicate a failing or failed drive. In this case the SATA port was unplugged and sometimes the Linux kernel/motherboard even with AHCIjust don't play nice and can't handle it.
What happened is Iplugged in a new drive after removing another one. However the log shows that after the old drive was plugged in the Linux kernel kept complaining thinking the drive was there but not responding properly. This continued even with reseating........
If you have this problem: http://realtechtalk.com/mencoder_bmovl_error_vf_bmovl_Unknown_command_Ignoring_-1860-articles
Then ffmpeg is for you. Go here if you are using Linux Mint and cannot find or install it to use an external PPA........
Based on this tutorial: http://www.linuxjournal.com/content/overlay-images-video-using-mplayer-and-mencoder
mencoder -oac pcm -ovc raw -vf bmovl=0:0:tfifo -o $output $file
vf_bmovl: Unknown command: ''. Ignoring. ........
I've had this issue since Ubuntu 9 and now even on Linux Mint 17 no matter what latest version of the Nvidia proprietary driver that I use. It just becomes slower and slower and only gets better after rebooting or restarting Xorg.
Someone here has it as well
https://askubuntu.com/questions/822449/graphics-becomes-slow-after-a-while/917886
It's very fru........
This is very annoying that ffmpeg is missing from Linux Mint! They have ffmpeg2theora which is a totally different codec and does not work as ffmpeg does at all (it is basically totally different).
However on Linux Mint 17 I was able to use a Ubuntu PPA and sucessfully install ffmpeg!
https://launchpad.net/~mc3man/+archive/ubuntu/trusty-media
Adding this PPA to your system........
Using Apache 2.2 and PHP5.6 PHPBB3 is very slow to respond. Actually for some reason it takes so long to even register a log entry in access_log as in several seconds or a few minutes later it shows up in Apache. All other vhosts and Apache access stops working and freezes until the request to access PHPBB3 slowly completes.
It seems to randomly be slow if you stop using it whether for posting or reading the forums. I've migrated to different machines including........
apachectl -l
Compiled in modules:
core.c
prefork.c
http_core.c
mod_so.c
It is "prefork.c" so in httpd.conf these settings are what you would use (if you use worker.c it won't have any impact):
StartServers 2
MinSpareServers 5
MaxSpareServers&nb........
This error is commonly due to Java security or TLS settings but there is a second issue with forwarded ports that also causes it.
1. Java Security/TLS Settings issue:
This article has the solution to change them all in Linux automatically
2. Port Forwarding Issue if your Avocent DSR is behind NAT/private IP........
Ihave a tar and when extracting it changes /root to a uid and gid of the source server which is bad especially for /root!
You can get around this by extracting as follows:
Add the -o switch which means "--no-same-owner"
tar -o -zxvf sometar.tar.gz........
Centos 7 is no cakewalk, there are many fundamental features and basic utilities that are missing or even completely renamed or different!
Another shocking thing is to check your NIC it is set by default to not turn on when booting!
And by the way there is no more standard eth0 the NIC convention is now "enp0s3"
vi /etc/sysconfig/network-scripts/ifcfg-enp0s3........
There are usually two reasons for this.
#1 The most common is that you need to enable the -r (recursive) flag with zip to make it recurse into directories.
So the solution is to use -r
zip -r somefile.zip yourfiles
#2 If you are using bash scripting based on ls without the full path or for some other reason the full path is missing, zip looks for the files in the current directory so this will always fail.........
A common mistake is people think you should tell the li padding to be 0px but this is wrong.
All you need is the following code in line:
your item
your item
In a css class:
.yourclass {
ul.margin: 0px;........
This is especially helpful if you run your own servers. If you are presented with an error message or warning that the signature has changed or does not match the IP/domain you are connecting to you always want to verify manually.
So your e-mail/web client will show you an SHA-1 fingerprint like this:
"Could not verify this certificate because the issuer is unkown" or other reasons such as a mismatch in IP/domain.
It will also show you........
ecryptfs-mount-private
Enter your login passphrase:
Inserted auth tok with sig [ee16d84] "into the user session keyring
mount: No such file or directory"
[ 156.118113] ecryptfs_mount: kern_path() failed
[ 156.118431] Reading sb failed; rc = [-2]
[ 164.233055] traps: mate-notificati[3472] trap int3 ip:7f43d7002c13 sp:7fff162c6600 error:0
[ 166.017061] ecryptfs_mount: kern_path() failed........
In short the two drives in the array were /dev/sdd and /dev/sde. The kernel sees they were unplugged and have gone down as you can see below.
mdadm caught the first one being unplugged /dev/sde and disabled the missing drive. However when the final drive that was part of the array is unplugged it didn't notice at all. Instead it complains about an IO error later for drives that the kernel knows do not exist anymore.
[45817.162728] ata4: exception........
1.) Replicate the number of partitions in your new drives.
gdisk /dev/sda
gdisk /dev/sdb
I created 3 partitions of the same same size.
partition #1: +1G (/boot)
partition #2: +60G (swap)
partition #3: rest of it (/)
#note if you are using GPT/gdisk you need to create separate a partition at least 1MB in size (in my case I would a 4th partition and mark it type ef02).........
The "passwords do not match" implies or makes it appear that your auth code is wrong but actually you have to click "View additional settings" and then see there are 2 password fields to manage the domain once it is transferred (the password is typed twice for confirmation). Simply fill out a password twice or remove the first password fields contents and all will be well.........
What code is being returned or where is a URL/domain redirecting you to? Curl makes this easy and simple:
curl -Iyourdomain.com........
At first I thought it's just not possible but there is actually an option that can be enabled to make symlinks work with Samba.
Then I put this under the [global] section
Note: It's "wide links" and not "wide symlinks" (some other sites have incorrect info which was a frustrating waste of time :))
Add this to your smb.conf
follow symlinks = yes
wide links = yes
unix ex........
Remove the failed partition /dev/sde1
mdadm --manage /dev/md99 -r /dev/sde1
mdadm: hot removed /dev/sde1 from /dev/md99
Now add another drive back to replace it:
# mdadm --manage /dev/md99 -a /dev/sdf1
mdadm: added /dev/sdf1
A "cat /proc/mdstat" should show it resyncing if all is well.........
Solution:
yum -y install --skip-broken package-you-want-to-install
Packages skipped because of dependency problems:
php56w-mysql-5.6.30-1.w6.x86_64 from webtatic
Error: Multilib version problems found. This often means that the root
cause is something else and multilib version checking is just
pointing out that there is........
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
12: Timeout on http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Error: Cannot find a valid baseurl for repo: base
You would think this should be fine and simple like using a proxy with most other software?
However........
In short the solution is just to use vgremove for the actual /dev/mapper device:
vgremove /dev/mapper/backups-backuplv
box mnt # mdadm --manage /dev/md8 --stop
mdadm: Cannot get exclusive access to /dev/md8:Perhaps a running process, mounted filesystem or active volume group?
box mnt # lv
lvchange lvconvert lvcreate l........
This was a surprising bug but I unplugged all drives for an array md127. At first it was just 1 drive and mdadm seemed to notice this. I unplugged the second drive taking the array offline but mdadm did not realize it was offline and still showed a non-existent disk as being part of it. This created problems trying to unmount it or even to stop this array with mdadm freezing.
As for how to fix it I can only think of making sure you are not in a mounted path of........
Cannot even "Browse Network" when clicking on "Windows Network"
Unable to mount location
Failed to retrieve share list from server: No such file or directory
logs:
[2017/02/14 00:16:44.271314, 0] ../source3/nmbd/nmbd.c:58(terminate)
Got SIGTERM: going down...
[2017/02/13 17:35:41.797944, 0] ../lib/util/become_daemon.c:124(daemon_ready)
&........
[Thu Jan 26 14:13:31 2017] [notice] caught SIGTERM, shutting down
[Thu Jan 26 14:14:00 2017] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Thu Jan 26 14:14:00 2017] [error] Server certificate is expired: 'Server-Cert'
[Thu Jan 26 14:14:00 2017] [notice] SSL FIPS mode disabled
[Thu Jan 26 14:14:07 2017] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Thu Jan 26 14:14:07 2017] [error] Server certificate is expired: 'Server-Ce........
Uh oh
[17925926.174277] block drbd0: Handshake successful: Agreed network protocol version 96
[17925926.174325] block drbd0: conn( WFConnection -> WFReportParams )
[17925926.174342] block drbd0: Starting asender thread (from drbd0_receiver [1682])
[17925926.174432] block drbd0: data-integrity-alg:
[17925926.174581] block drbd0: drbd_sync_handshake:
[17925926.174586] block drbd0: self 2AAE66AF9252D6DB:2815BF........
Many users still are not aware but simply patching OpenSSL does not secure you against many known and easy to exploit attacks that will render your encryption useless by an attacker.
Use the following setings in /etc/httpd/conf.d/ssl.conf
SSLCipherSuite "EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH EDH+aRSA !CAMELLIA !SEED !3DES !RC4 !aNULL !eNULL !LOW !MD5 !EXP !PSK !........
This actually only happened after an e-mail server ran out of space due to run away log files. Normal Desktop clients were not affected. It appeared to be a bug in K9 mail but even reinstalling/wiping all settings did not fix it (read e-mails would still not reappear).
This is moreso a bug in Dovecot where it probably messes up the index files.
How do you fix this in Dovecot/your e-mail server?
You need to delete the do........
This happened while updating Linux Mint/Debian/Ubuntu on a remote SMB/Samba share.
Solution
After waiting for updates to complete things will work normally but it really is strange that the service actually stops working or is disabled for so long during the update. It is likely the update process stops the serivce and only restarts after the update is complete.........
This happens sometimes that it takes a fair amount of time for some WHMCS installations but it usually ends up completing eventually.........
The solution is simple but strange, if you copy your /var/lib/mysql directory to another server and think it will work, be sure to check if you have /var/log/mysql and binary log files. If you do, the server will not work and will give you errors like below and crash without the proper log files.
UPDATE user SET password=password("newpass") WHERE user='root';
flush privileges;
ERROR 2013 (HY000): Lost connection to MySQL server durin........
The "-S" switch is important as it works with sockets if you use "-f" it will not detect the socket file is there.
if [ ! -S "/var/lib/mysql/mysql.sock" ]; then
echo "Socket does not exist, restarting"
service mysqld restart
fi........
170110 5:35:23 [Note] /usr/libexec/mysqld: Normal shutdown
170110 5:35:23 [Note] Event Scheduler: Purging the queue. 0 events
170110 5:35:23 InnoDB: Starting shutdown...
170110 5:35:24 InnoDB: Shutdown completed; log sequence number 0 12765401
170110 5:35:24 [Note] /usr/libexec/mysqld: Shutdown complete
170110 05:35:24 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended........
2017-01-12 14:25:36 529 (ERROR): The installer was unable to verify that your kernel supports IPv6.
2017-01-12 14:25:36 530 (ERROR): The message received when trying to create an IPv6 socket was Address already in use
2017-01-12 14:25:36 531 (ERROR): Please ensure that the ipv6 module is enabled and loaded in your kernel.
2017-01-12 14:25:36 532 (FATAL): Exiting...
Solution
This happened........
An easy way to pay companies and friends/family since PayPal does not have an option when sending money to make it a subscription:
"business" = The e-mail or PayPal ID of the person/organization to pay to.
a3 The recurring amount "eg. 115" will be 115 USD
p3 The time period (eg. 2)
t3 Unit of time period m=monthly,w=weekly,y=yearly
item_name = "the note/product service reason you are paying ha........
service named status
rndc: connect failed: 127.0.0.1#953: connection refused
named (pid 10557) is running...
This issue is normally caused by a permissions issue where named doesn't have the permissions to read the rndc.key.
Check /var/log/messages:
Jan 4 17:06:22 storagebox named[10753]: none:0: open: /etc/rndc.key: permission denied
Jan 4 17:06:22 storagebox named[10........
# yum -y install qemu-kvm
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: mirror.lzu.edu.cn
* elrepo: ftp.utexas.edu
* epel: ftp.jaist.ac.jp
* extras: mirrors.aliyun.com
* openvz-kernel-rhel6: mirror.fdcservers.net
* openvz-utils: mirror.fdcservers.net
* updates: mirrors.nwsuaf.edu.cn
Resolving Dependencies........
It is already known this is not possible
mdadm --create /dev/md3 --level 10 --layout=f2 --raid-devices=2 /dev/sdc1 /dev/sdd1
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid10 devices=2 ctime=Sat Dec 24 18:44:29 2016
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid10 devices=2 ctime=Sat Dec 24 18:44:29 2016
Continue creating ar........
sudo fdisk /dev/sdh
WARNING: GPT (GUID Partition Table) detected on '/dev/sdh'! The util fdisk doesn't support GPT. Use GNU Parted.
WARNING: The size of this disk is 8.0 TB (8001563221504 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).
The device presents a l........
You are checking your MySQL logs in /var/log/mysqld.log and come across an error like this:
161222 18:03:40 [ERROR] /usr/libexec/mysqld: Table './eximstats/sends' is marked as crashed and last (automatic?) repair failed
The Solution:
cd /var/lib/mysql/eximstats
myisamchk -r sends.MYI
- recovering (with sort) MyISAM-table 'sends.MYI'
Data records: 71129........
iptables -t nat -A OUTPUT -m addrtype --src-type LOCAL --dst-type LOCAL -p tcp --dport 3306 -j DNAT --to-destination ip.ip.ip.ip
iptables -t nat -A POSTROUTING -m addrtype --src-type LOCAL --dst-type UNICAST -j MASQUERADE
sysctl -w net.ipv4.conf.all.route_localnet=1
Make sure you substitute "ip.ip.ip.ip" for your real public IP and also the "--dport 3306" for the port you want to forward.
Finally run the sysctl command and........
The only solution after trying many suggestions was to simply restart the "vz" service (definitely not preferable).
Even doing an ifdown and ifup for venet0 did not help.
ifup venet0
Bringing up interface venet0:
Configuring interface venet0:
net.ipv4.conf.venet0.send_redirects = 0
RTNETLINK answers: Network is down
Some errors from log:
CPT ERR: d2dc60........
md127 issue, it should be /dev/md3 per mdadm.conf
Any time something is mounted as md127 it almost always means there is no entry for this mdadm array in the mdadm.conf in initramfs (which is separate from your actual /etc/mdadm.conf).
cat /etc/mdadm.conf
ARRAY /dev/md3 metadata=1.2 UUID=b6722845:381cc94e:7a2c5b5f:8e3b7c4f
The reason for this is something strange, most Linux OS's bizarrely always keep their own copy of /etc/mdadm.con........
Everytime I've seen this error "/dev/drbd0: State change failed: (-2) Need access to UpToDate data" it is because DRBD has no disk:
cat /proc/drbd
version: 8.3.13 (api:88/proto:86-96)
GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 build by root@sighted, 2012-10-09 12:47:51
0: cs:Connected ro:Secondary/Secondary ds:Diskless/Inconsistent A r-----
ns:0 nr:0 dw:0 dr:0 al........
Now many people report this card simply not working in various Linux distros and kernels. My issue is different, it always works at 100mbit (eg. plugged into a 100mbit switch) but no matter what 1000M/gigabit switch I would try, it would never work.
The link would be up (the lights were on) and the OS detected the link as being up as well but it wouldn't work at all and could not pass data in or out (not even a ack/ping).
There is one simple solution and command........
M4A is a weird format, so you have to be creative here is a quick copy of what I did.
Basically you need to convert to .wav to make use of them and thenI converted the resulting .wav into an mp3 (nice small file size and basically universally playable):
=======
sudo apt-get install mpg321 mp3gain faad normalize lame
faad "Voice 002 (copy).m4a"
faad "Voice 002 (copy).m4a"........
Tired of checking iotop and seeing that your drbd partition is using 99.99% of io all the time and finding your drbd device performs slow in general?
This is especially an issue in versions of DRBD in the 8.3 tree in particular one documented case is on "8.3.13" but it likely applies to other devices.
The symptoms are that resyncing is fine and normal but any reasonable amount of activity is very slow and lagged and creates a high server load and con........
When installing Windows 2012 I cannot get around that error for some reason it just keeps on happening.
code:0xc0000005........
Your cPanel may not work if you enter your non-main IP when setting it up. The way to fix it is to go back to the setup screen by removing the following file:
rm /etc/.whostgrft........
It is possible to tell mdadm to create an md device on a raw disk even though it will give you an error, it writes a superblock and this corrupts the partition table which can result in your system not booting.
To fix it just zero the super-block on the offending device that you made the mistake in.
Eg: /dev/sda
mdadm --zero-superblock /dev/sda
It is also a way of starting fresh if you wanted to create a new array.........
vzkernel-2.6.32-042stab116.2.x86_64.rpm&n........
We've all done this at some point, you work on the wrong shell window and this was my first time making this mistake but I deleted a partition table in fdisk, recreated it and saved it with "wq" and even ran partprobe! If you haven't rebooted yet then you can still recover your partition table, otherwise you're in big trouble.
Fortunately since it was a live system and in use the kernel still had to use the old table like below:........
Usage: geoiplookup [-h] [-?] [-d custom_dir] [-f custom_file] [-v] [-i] [-l]
Usage: geoiplookup [-h] [-?] [-d custom_dir] [-f custom_file] [-v] [-i] [-l]
grep: Address: No such file or directory
grep: not: No such file or directory
grep: found: No such file or directory
sh: -c: line 1: syntax error near unexpected token `|'
sh: -c: line 1: `|cut -d ',' -f 2'
........
migrating from an old OpenVZ (Centos 5) to new OpenVZ (Centos 6)
Also if migrating from 32-bit HN to 64-bit your RAM will probably be much bigger than it should be!
16x bigger
eg. 32bit HN:
total used free shared buffers cached
Mem:&nb........
I still cannot understand how this would not be enabled by default and I struggled to find the reason why with manually installing samba etc.. wondering why the option for sharing was not in the menu.
On Linux Mint "MATE" the package is called "caja-share" and on Cinnamon it is called "nemo-share" so edit the below command as necessary:
*Also note that the "samba" package is necessary as it is not inst........
Syncing private
Live migrating container...
Syncing 2nd level quota
11000: invalid option -- F
Usage: vzdqload quotaid [-c file] commands
Loads user/group qouta information from stdin into quota file.
-c file use given quota file
Commands specify what user/group information to load:
-G grace time
-U disk limits........
rm /vz/lock/1200.lck
rm: remove regular file `/vz/lock/1200.lck'? y
vzctl start 1200
Container already locked
vzctl start 1200
Starting container ...
vzquota : (error) can't lock quota file, some quota operations are performing for id 1200
vzquota on failed [7]
vzquota off 1200
vzctl start 1200
vzquota on 1200
root@rttbox ~]# vzquota off 1200
vzquota : (........
This happened while an mdadm array was syncing, all access from writing a new blank file to opening a small .txt file was very slow:
[222117.312078] kjournald starting. Commit interval 5 seconds
[222117.685060] EXT3-fs (md0): using internal journal
[222117.685096] EXT3-fs (md0): mounted filesystem with ordered data mode
[222122.376847] kjournald starting. Commit interval 5 seconds
[222122.602825] EXT3-fs (md2): using internal jour........
You may get this after a long time of not rebooting but especially if you have rsync'd a / partition or deployed an image to another VPS or computer, you will often have this issue.
The good thing it usually just takes a reboot.
Here is more info from Centos........
Errors like this are shown on high usage servers and ports so it is common to see it on http and even imap ports:
possible SYN flooding on port 80. Sending cookies.
The Linux kernel will even detect flooding on OpenVZ containers:
possible SYN flooding on ctid 6000, port 993. Sending cookies.
In many cases this is not an issue and is more so simply a result of regular, but high usage traffic.........
Stopping httpd: [ OK ]
Starting httpd: [Wed Jun 29 19:29:44 2016] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
[Wed Jun 29 19:29:44 2016] [warn] _default_ VirtualHost overlap on........
In Firefox I cannot connect to any website, proxy is disabled and outside network access is confirmed, no system or manual proxy was set on this Linux Mint/Ubuntu system. Normally this can be caused by proxy or DNS problems and the weird thing is that traceroute and ping to other IPs worked fine but even connecting to sites by IP was not working.
The connection was reset
The connection to the server was reset while the page was loading.........
kernel: [10186978.064405] TCP: time wait bucket table overflow (CT3)
Varying opinions are out there but in general it seems like the most common culprit is a lack of privvmpages, with a modern OpenVZ system the best way is to set privvmpages as equal to what your RAM is and this has resolved the messages on another system.
If it's truly a TCP issue you can adjust the following parameters:........
sed gets to be a pain and a real mess and is hard to read and understand when you have to escape things like / etc.
Idid not realize until recently that you don't need to use / as a separator, you can use virtually any non letter or number character.
Eg we have used # as the separator to avoid having to escape the forward slashes and in this way the command is plain, easy to understand, edit and saves time/hassle without the need for escaping.
sed -i s#http........
It all comes down to a bug essentially where you are running an older kernel that doesn't support the newer Debian templates. The solution is to update your OpenVZ kernel.
Here are some symptoms of the problem/lack of kernel support:
Ubuntu Template 12.04 requires a manual network start:
service networking start
sshd will not start:
/usr/sbin/sshd
PRNG is not seeded
mknod /dev/random c 1 8........
There was only one solution here and it was the following:
edit /etc/httpd/conf/httpd.conf
Comment the lines for the Mime Magic Module:
# MIMEMagicFile /usr/share/magic.mime
# MIMEMagicFile conf/magic
*Don't forget to restart Apache and clear your browser cache twice
I was using DefaultType and ForceType a........
When you start uploading larger images in Wordpress you have to make sure your maximum attachment size is large enough and that the execution time is not too short:
Uploading
Error
HTTP error.
[Thu May 12 16:32:25 2016] [error] [client 10.10.5.2] PHP Fatal error: Maximum execution time of 30 seconds exceeded in /httpdocs/blog/wp-includes/class-wp-image-editor-gd.php on line 182
Solution Edit p........
This is a common mistake but many people do not realize this function comes from mysql itself, so therefore you need an active mysql connection open.
Usually the string will be empty and null when you call it from outside of the database connection portion of your code.
eg. an example of the wrong way and creating a null/empty string
$var = mysql_real_escape_string($myself)
mysql_connect();
// returns n........
Usually the cause is inexplicable because some things just don't work correctly even when calling all commands by their full path.
Usually adding the following to your crontab file at the top will fix/solve the issue:
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
........
This can happen because port 80 is not open, or your license has expired and/or your IP is out of date and also if the license server itself from cPanel is having issues.
In most cases as long as you have a valid license the following command will solve it:
/usr/local/cpanel/cpkeyclt
Updating cPanel license...Done. Update succeeded.
Building global cache for cpanel...Done
Cannot........
pip install obfsproxy
/usr/lib/python2.6/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning
You are using pip version 7.1.0, however version 8.1.1 i........
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
No module named yum
Please install a package which provides this module, or
verify that the module is installed correctly.
It's possible that the above module doesn't match the
current version of Python, which is:
2.7.9 (default, Apr 21 2016, 16:51:58)
[GCC 4.4.7 20120313........
curl -k https://somesite.org
curl: (35) SSL connect error
The site used to work until I got a new SSL cert
Updating curl with (yum -y install curl) made it work again.
........
cp -a /your/source/. /your/dest/
-a preserves all file atributes and symlinks
the "." at the end of /source/ includes all hidden files such as .htacess, .bash_history, .ssh etc..
The / in /dest/ makes sure the contents go into it instead of replacing /dest itself (eg. if you did not have the / at the end).........
Stopping httpd: [FAILED]
Starting httpd: httpd: Syntax error on line 73 of /etc/httpd/conf/httpd.conf: Cannot load /etc/httpd/modules/mod_file_cache.so into server: /etc/httpd/modules/mod_file_cache.so: cannot open shared obje........
This is a simple fix but not a simple problem and it still doesn't make sense to me.
But in a nutshell if your target proxy server works fast when accessing directly over SSL then this may be your issue.
It seems SSL does not play nicely when the target proxy destination/host has a riduculously long key (such as 8192 bits long). Now this is normally not a problem, in fact the target server could be accessed with hardly any delay directly despite such a long key.........
Auction 262382440107: Cannot connect to URL : SSL connect error: gnutls_handshake() failed: Illegal parameter
Retrying...
esniper encountered a bug. It looks like your esniper version is not
current. You have version 2.28.0, the newest version is 2.31.0.
Please go to http://esniper.sf.net/ and update your copy of esniper.........
At first my BIOS said the card may not work right because there is no more option ROM space.
I disabled the Option ROM for both LSI 1068 and 2008 chipsets, Network Boot ROM and most other PCI slots, Serial Port, etc... and the message went away but the card still does not work properly.
But it still cannot initialize the card properly(does not work):
[ 33.943272] NVRM: This PCI I/O region assigned to your NVIDIA device is invalid:........
Download from here http://www.avagotech.com/products/server-storage/host-bus-adapters/sas-9200-8e#downloads
sudo Installer_P20_for_Linux/sas2flash_linux_i686_x86-64_rel/sas2flash -listall
LSI Corporation SAS2 Flash Utility
Version 20.00.00.00 (2014.09.18)
Copyright (c) 2008-2014 LSI Corporation. All rights reserved
&nbs........
There are a few ways of doing this and all basically involve using the reverse proxy or "ProxyPass" feature of Apache to accomplish it.
1.) Create a normal vhost and simply symlink the root directory of the site you want to mirror.
Eg. originalsite.com and newsite.com
/vhosts/originalsite.com/httpdocs
You would symlink like this:
ln -s /vhosts/originalsite.com/httpdocs vhosts/originalsite.com/........
I modified the default to the following for faster local dialing for North American area codes:
(*xx|[3469]11|0|00 [2-9]xxxxxxS0|[2-9]xxxxxxxxxS0|1xxx[2-9]xxxxxxS0|xxxxxxxxxxxx.)
This is what I added to the above: "[2-9]xxxxxxxxxS0" so any 9 digit number is dialed instantly xxx-xxx-xxxx (the S0 at the end makes it dial right away). This makes dialing much quicker and is recommended.
*No........
I have two lines on my PAP2T and the only thing that solved this problem rather instantly was to change the line with the problem to using port 5060 instead of 5061 (so both lines are using port 5600). Note that I am not forwarding either port in my router either.
Some of the symptoms of this problem for me were the following:
No dialtone or it would take several tries.
You answer a call but the phone keeps ringing (takes a few times t........
service iptables start
iptables: Applying firewall rules: iptables-restore: line 40 failed
[FAILED]........
The first thing to diagnose is what is actually in the database (use PHPMyAdmin or CLI).
You will of course either find that the backslash is either in the database or not.
If the backslash is in the database you probably have magic quotes gpc/runtime on and/or are calling the "addslashes()" function which does this.
If you are escaping your data with mysql_real_escape_string() then think again, you probably have magic quotes gpc enabled either in php.ini or........
1.) Flash directly to this file:
http://tomato.groov.pl/download/K26RT-N/build5x-132-EN/Linksys%20E-series/tomato-E2500-NVRAM60K-1.28.RT-N5x-MIPSR2-132-Max.zip
*I was never able to get the larger "Mega" file to work, at least not initially so I recommend the file above.
To enable 5ghz I had to do the "Clear NVRAM" Option before it was shown.
2.) Or if you don't need 5ghz (most devices do not support it and cannot........
According to this and my own experience it is the case that you have started something running in the foreground or a server that does not terminate with a normal rc.d script. The server will reboot once you kill whatever command or process that is.........
The Scenario
You have dual NICs and you disable NIC1 which uses 192.168.1.1 as its gateway. With NIC2 you enable it/connect it to another network which also has the gateway 192.168.1.1
Everything will work fine at this point.
When switching back to NIC1 even with NIC2 disabled and even unplugged, the OS basically can't pick up the new/updated ARP entry of the old device for 192.168.1.1 and perhaps thinks it is a security risk or spoof of some sorts and blocks i........
This is a real pain because I had to manually unplug ethernet cables for network testing or to use an alternate network or guarantee physical access to one network segment is cut off.
For some reason this happened after Ikilled dbus because it was confused and blocking packets thinking they were coming from the wrong interface since eth0 and eth1 both had the same subnet and gateway.
I eventually did a "service network-manager restart" but the option was........
Iwill start by saying I think I know what caused this boot-time error on Linux Mint but should also apply to Debian and Ubuntu.
I changed my BIOS time to several hours in the past to match the current time, but this caused Linux to think there were incorrect filesystem times.
The problem is that it seems when you hit this I am not sure what is happening, it doesn't seem to be doing fsck and hangs without prompting the user.
What I have found is that........
The following assumes the computer is local/physical to you and/or it always has a LANIP so it can be accessed on site without having a default gateway.
The key to this is not to set a default gateway for your computer or you can set a script on boot or other time to delete the gateway (where eth0 is the NIC you are using):
route del default eth0
50.80.20.2 is the VPN server you connect to
192.168.1.1 is your........
This command in Debian/Ubuntu/Mint will get everything need installed for most Java based KVM viewers:
sudo apt install icedtea-netx
The following additional packages will be installed:
ca-certificates-java icedtea-netx-common openjdk-8-jre openjdk-8-jre-headless
It seems every other updated version of Java or Icedtea breaks things and I will save the frustration of Java for another post.........
This was a horrible shock after upgrading fromUbuntu 9 to Linux Mint 17 and I found that the last distro to support tsclient was Debian Squeeze.
For some reason it has disappeared for a long time and the new options such as rdesktop and gnome-rdp do not have any start menu entry and just aren't done as well as tsclient.
Fortunately there is a solution:
tsclient surprisingly can be downloaded as a direct .deb package and it fails with some variou........
grub> root (hd0,0)
root (hd0,0)
Filesystem type is ext2fs, partition type 0xfd
grub> setup (hd0)
setup (hd0)
But if you do:
root (hd1,0)
setup (hd1)
it does work, I think hd0/sda had a GPT partition that was not removed properly (what I did was just dd bs=512 count=1 the partition table from another drive since the partition table should be identical).
Checking if "/boot/grub/........
A handy trick in bash that can be adapted to many useful tasks:
for i in {1..99}; do
echo $i
done
1
2..
97
98
99
100
Another tricky is if you need a 0 in front of the first letters:
for i in {1..12}; do
if [ $i -lt 10 ]; then
i=0"$i"
fi
echo $i........
mono/wine not working in Ubuntu/Linux Mint/Debian:
The assembly mscorlib.dll was not found or could not be loaded.
It should have been installed in the `/usr/lib/mono/2.0/mscorlib.dll' directory.
solution:
sudo apt-get install mono-complete
Problems:
mono does not work well for even simple things like a Winrar self extracting .exe fi........
Your server does not support SNI, so all of your SSL websites must use the same SSL certificate. An update to the certificate on an existing SSL website will affect all of your SSL websites, and new SSL websites must use the currently installed certificate.........
I was asked to troubleshoot why a site wasn't loaded or responding properly, it turned out they were using some old javascript tracker from Bing/Microsoft that is no longer valid or working. You have to wait forever for it to time out but it really did disrupt the functionality of a very important site:
flex.atdmt.com
If you have the above code in javascript on your site remove or comment it out.........
If the file size is too large you need to resize them on the fly:
convert -resize 25% *.jpg output.pdf
The resize flag takes a % I have tried without and it seems to take it as pixels and becomes way too small.
You can also play with the "-quality 25" flag to decrease file size even more.........
It is a common issue and here is the solution (increase the density/dpi):
convert -density 120 some.pdf output.jpg
You will need to play with the density setting to get the perfect file size and resolution.
If you want a smaller file you can always use the "-quality" switch and eg. -quality 25 would be 25%/100 quality........
Istanbul:
At least in Linux Mint the latest 17.2 version Istanbul freezes when "In process of saving to Disk" even with the workaround of not having Sound recording enabled. It looks like a great app but bugs like this seem to have plague it for over 8 years!
Kazam:
This little app works great, its only bug is that when you try to tell it to record a window or area it puts a gray cov........
In plain English this happens after you upgrade VBOX and it rebuilds kernel modules based on a newer kernel than you are running (eg. you upgraded your kernel but haven't booted into it).
It is too bad there is not a standard work around that would allow it to realize this and keep old kernel modules and use them if it detects your current kernel is older than the most recently build modules.
===============
RTR3InitEx failed with rc=-1912 (rc=-1912)
The........
I am getting this error:
kernel:[14277.697049] EDAC MC0: UE row 4, channel-a= 0 channel-b= 1 labels "-": (Branch=0 DRAM-Bank=0 RDWR=Read RAS=7048 CAS=0 FATAL Err=0x4 (>Tmid Thermal event with intelligent throttling disabled))
But many people believe this is a bug/false message and the server is running stably.........
It sounds like this is corrected in later versions of the OpenVZ kernel but Iam not sure, it may also be that a much newer kernel is needed and Centos may not have a recent enough kernel.
*Debain 7.0 however does work fine as a temporary fix or work around.
Debian 8 OpenVZ no IP and networking not working:
lo Link encap:Local Loopback
 ........
Say you have a path like this "/some/path/here with spaces/". If you try to transfer it you will get a message along the lines of:
scp -rp 192.168.0.12:"/some/path/here space/" .
scp: /some/path/here: No such file or directory
scp: space: No such file or directory
You can escape each space but what a pain that is especially if you have multiple spaces in the path.
The simplest way is to use the follow........
This seems to effect many other LG phones , specifically their keyboard app and basically makes your phone unusable where you cannot use the keyboard because that message keeps popping up and the keyboard will not load.
unfortunately lg keyboard has stopped solution:
1. Go to your settings and manage apps and find the LG Keyboard app:
2. Stop it from running, delete all data and clear all cache.
After the above you will probably find that your........
How to Increase The Disk and Partition Size in Windows 2022,2019,11,10,8,7 etc.. Server
1, Enter the command prompt
Start -> cmd
2. Start diskpart
diskpart
3. Find the drive that has the wrong size
list volume
4. Select the volume (in this example we use volume 2)
select volume 2
5. Extend the volume........
INSERT INTO articles_backup
SELECT * FROM articles WHERE articleID="118"
It is so simple we always recommend people do this when updating their database so you always have a backup.
The above inserts the copy into the table "articles_backup" which has an identical structure.
It selects the entry from "articles" where the articleID is "118" but of course you can adapter yours to whatever the situation is.........
In this example we have 2 drives in a RAID array and /dev/sdb is the one that failed. /dev/sda1 is also the /boot partition which we tell grub to install on /dev/sdb eg install root (hd0,0) /dev/sda1 on the new drive /dev/sdb (hd1)
First copy the partition table from /dev/sda to /dev/sdb
dd if=/dev/sda of=/dev/sdb bs=512 count=1
Run partprobe to detect the new partition table
partprobe........
Here is the scenario you or a client have a remote machine that was installed as a standard/default minimal Centos 6.x machine on a single disk with LVM for whatever reason. Often many people do not know how to install it to a RAID array so it is common to have this problem and why reinstall if you don't need to? In some cases on a remote system you can't easily reinstall without physical or KVM access.
So in this case you add a second physical or disk or already ha........
In my case I could login with the initial install but I rsync'd everything over while preserving ownership and permissions to another RAID partition and booted from that.was fine before. The problem is that you are kicked out the second you login and the problem was SELINUX for some reason (perhaps it noticed something strange when it was moved to the new partition)
login: pam_unix(login:session): session opened for user root by LOGIN(uid=0)
login: ROOT LOG........
#solution
Edit /etc/yum.repos.d/openvz.repo
For the first two entries comment out #mirrorlist and uncomment #baseurl and then it worked
openvz yum problem Centos 6.5 cannot find file on mirror:
yum update
Loaded plugins: fastestmirror
Determining fastest mirrors
* openvz-kernel-rhel6: mirrors.ustc.edu.cn
* openvz-utils: mirrors.ustc.edu.cn
base ........
The solution was to reinstall the vbox dkms package and do a manual modprobe of the modules it makes.
I never sorted out the unable to start due to the USB issue, I did have the guest additions installed but the only way to boot was to change the pointing device from USB to PS2 and then to disable the USB controller (if your pointing device is set as USB, disabling USB will not work because it will re-enable by default when it sees your pointing device is USB, this is w........
Iwas surprised to see that Linux Mint at the latest 17.2 version still has NO mdadm installer option, and worse the installer will not be able to create a proper booting environment even when you do install it.
How to setup mdadm in Linux mint LiveCD
sudo su
apt-get install mdadm
# partition as you need and then create your mdadm devices
# create your SWAP md0
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /d........
Before reading on remember to put the line at the bottom of /etc/sudoers as from experience what happen is that other rules cancel out what you have added.
If your sudoers setup is correct it will work immediately upon saving without requiring a reboot.
Edit /etc/sudoers
yourusername ALL = NOPASSWD: /path/to/command
*Once again remember the above should be on the bottom of the sudoers file or........
freshclam
ERROR: Can't open /var/log/clamav/freshclam.log in append mode (check permissions!).
ERROR: Problem with internal logger (UpdateLogFile = /var/log/clamav/freshclam.log).
Tue Oct 13 13:49:35 2015 -> WARNING: Incremental update failed, trying to download daily.cvd
Tue Oct 13 13:49:35 2015 -> WARNING: Can't download daily.cvd from db.local.clamav.net
Tue Oct 13 13:49:35 2015 -> Trying again in 5 secs...........
sudo apt-get install zoneminder
[sudo] password for one:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
libuser-perl python-evince kdebase-apps kwrite unixodbc
libgnomeprint2.2-data python-soappy vgabios python-metacity hddtemp
python-mediaprof........
[ 2868.041375] ata1: EH in SWNCQ mode,QC:qc_active 0x40 sactive 0x40
[ 2868.041554] ata1: SWNCQ:qc_active 0x40 defer_bits 0x0 last_issue_tag 0x6
[ 2868.041556] dhfis 0x40 dmafis 0x40 sdbfis 0x20
[ 2868.041874] ata1: ATA_REG 0x41 ERR_REG 0x84
[ 2868.042013] ata1: tag : dhfis dmafis sdbfis sactive
[ 2868.042163] ata1: tag 0x6: 1 1 0 1
[ 2868.042301] ata1.00: exception Emask 0x1 SAct 0x40 SErr 0x400000 action 0x6 frozen
[........
If you are getting this error from Pluto/IPSEC it is almost always due to a routing or NAT issue.........
I never did get it working, it is too bad as obfsproxy should really be an option and integrated into the OpenVPN client and server or something similar:
yum -y install python-pip python-devel
No package python-pip available.
#install the EPEL repo
python-pip install obfsproxy
python-pip install obfsproxy
-bash: python-pip: command not found
pip install obfsproxy
&........
If you get that message it means you have inserted the adapter or device incorrectly. In my case the adapter needed to be at the rear end of the pins and it caused this message.
Do not ignore this message as it may appear to work but you will get errors and in reality your chip will not be erased or programmed even if it appears like it is working.........
root (hd2,1)
Filesystem type unknown, partition type 0x83
grub> root (hd2,2)
root (hd2,2)
Filesystem type is ext2fs, partition type 0x83
grub> setup (hd2)
setup (hd2)
Checking if "/boot/grub/stage1" exists... no
Checking if "/grub/stage1" exists... no
#weird thing about grub is that the drive you enter is considered hd0
For example when booted fu........
Use netstat with the -anpe option. The e option shows the inodes and I do not know if it will always work or if it was by fluke but I was dealing with dozens of SSHsessions and needed to know which session was related to which forward (the PIDs of the SSHand SSHD did not match etc...)
Notice the "59560675" and "59560762" those are almost identical, if you find two sets that are nearly identical except for the last 3 digits they may match (in my ca........
vi /etc/yum/pluginconf.d/fastestmirror.conf
exclude=.hk,.cn
You could also use specific domains but as you can see above we are blacklisting all Hong Kong and Chinese mirrors in this example.........
Message from syslogd@server at Sep 14 11:35:59 ...
kernel:[Hardware Error]: MC4 Error (node 1): DRAM ECC error detected on the NB.
Message from syslogd@server at Sep 14 11:35:59 ...
kernel:[Hardware Error]: Error Status: Corrected error, no action required.
Message from syslogd@server at Sep 14 11:35:59 ...
kernel:[Hardware Error]: CPU:6 (10:8:0) MC4_STATUS[Over|CE|MiscV|-|AddrV|CECC]: 0xdc00400021080813........
Avocent Unable to load resource avctVideo.jar
Avocent requires port 80 and 443 to be forwarded or you will get a message like above if it's on a NAT network and you are accessing it from the outside (internet).........
iptables -t nat -A PREROUTING -p tcp -m multiport --dports 80,443,2068,8192 -j DNAT --to-destination 192.168.1.175
Just adjust the "--dports" to the ports you need and the --to-destination to the destination IP (note it must be on the same network as the server running iptables........
1.) My screensaver would take a long time to disable after hitting a key.
2.) Usually errors like below will follow.
3.) Compiz sometimes uses 100% or high CPU
4.) My window controls will disable (eg. the minimize, maximize and close buttons).
It seems like Compiz or appearance/effects disable themselves. Re-enabling Desktop Effects under Appearance temporarily fixes it.
5.) high load in general from things like "Migration" pr........
-------------------------------------
ProCurve J4903A Switch 2824
Software revision I.10.77
Copyright (C) 1991-2009 Hewlett-Packard Co. All Rights Reserved.
RESTRICTED RIGHTS LEGEND
Use, duplication, or disclosure by the Government is subject to restrictions........
ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
........
Fortunately the format is EATX so an EATX case will work and the screw layout is standard.
You will need to remove the HEX/TORX screws that are connecting the stock HP standoffs (meant to slide into an HP case).
XW9400 Motherboard Issues
Size: 12" x 13"
Proprietary Power Connector
Proprietary CPU Power Connector
Proprietary Memory Power Connector
Fan connectors are 4 pin so you will need some kind of adapter.........
It is as simple as using the "-k" option for:
-k, --keep-old-files don't replace existing files when extracting
--keep-newer-files don't replace existing files that are newer than
thei........
0000:00:00.0 RAM memory: NVIDIA Corporation MCP55 Memory Controller (rev a2)
0000:00:01.0 ISA bridge: NVIDIA Corporation MCP55 LPC Bridge (rev a3)
0000:00:01.1 SMBus: NVIDIA Corporation MCP55 SMBus (rev a3)
0000:00:02.0 USB controller: NVIDIA Corporation MCP55 USB Controller (rev a1)
0000:00:02.1 USB controller: NVIDIA Corporation MCP55 USB Controller (rev a2)
0000:00:05.0 IDE interface: NVIDIA Corporation MCP55 SATA Controller (rev a3)
0000:00:05.1 I........
This command rips the audio tracks to .wav files
*I recommend making a new directory with the name of the audio disc first and executing everything from within that directory below.
cdparanoia -B
Use the lame mp3 encoder to encode each one with this script:
*Note that this will encode any other files ending in "cdda.wav"
for track in `ls *cdda.wav`; do lame -b 192 $track; done........
so in this case we have files named like this:
track01.cdda.wav.mp3 track06.cdda.wav.mp3 track11.cdda.wav.mp3
track02.cdda.wav.mp3 track07.cdda.wav.mp3 track12.cdda.wav.mp3
track03.cdda.wav.mp3 track08.cdda.wav.mp3 track13.cdda.wav.mp3
track04.cdda.wav.mp3 track09.cdda.wav.mp3
track05.cdda.wav.mp3 track10.cdda.wav.mp3
but we want to rename them so they are like "05.........
An error occurred during a connection to site.com. SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long)
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.
When the above happens in our experience it is a misconfiguration of........
#from epel repo
yum -y install opendkim
chkconfig opendkim on
cd /etc/opendkim/keys
opendkim-genkey -vd mail.server.com
opendkim-genkey: generating private key
opendkim-genkey: private key written to default.private
opendkim-genkey: extracting public key
opendkim-genkey: DNS TXT record written to default.txt
........
yum -y install dvdauthor ffmpeg mjpegtools sox bc
rpm -ivh dvd-slideshow-0.8.4-2.noarch.rpm
Preparing... ########################################### [100%]
1:dvd-slideshow ########################################### [100%]
/usr/bin/dir2slideshow: line 553: bc: command not f........
This happened while trying to delete several thousand users from phpBB and basically corrupted the innoDB tables.
InnoDB: Page lsn 3 881164362, low 4 bytes of lsn at page end 881164362
InnoDB: Page number (if stored to page already) 86920,
InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0
InnoDB: Page may be an index page where index id is 700
InnoDB: (index "tid_post_time" of table "phpBBdb2005"."phpbb3_p........
ResourceManager[31705]: CRIT: Resource STOP failure. Reboot required!
This happened on a cluster Iam running with heartbeat for no particular reason that I can figure out.
The box ended up rebooting itself for some reason. It was not a big deal in the sense that the other servers in the cluster kept running but it would be nice to find the cause of this.........
This example is based on Wordpress but applies to any other query string eg.
http://wordpress.com/?p=55
If you want to manually redirect that p=55 to /some/other/url how do you do it?
RewriteCond %{QUERY_STRING} p=55 [NC]
RewriteRule .* /new-url/? [R=301,L]
You can change the p=55 to whatever your query string looks like.
Remember to keep the "?" at the end of the new URLunless you really want the query s........
This is a feature that works very well in bash and is easy to do:
*Remember you need the double brackets for this specific test even though a normal if would not require them
variable="hi there"
if [[ "$variable" = hi* ]]; then
echo "yes it contains hi"
fi........
It is very simple and like this to test for the existence of file using bash scripting:
if [ -f /etc/somefile ]; then
echo "yes it exists"
fi........
windows cannot find the microsoft license terms windows 2012 server install
This is actually because you are using less than 576MB of RAM. In my case I was installing on a KVM VPS with 512MB of RAM. This issue would apply to any physical or virtual server with less than 576MB of RAM. This includes Virtualized VPS Servers with XENHVM, KVM, VBOX, VMWare etc.. or Dedicated Servers with such little RAM.
It's very misleading of course since it has not........
If a service is not working and resetting it to defaults is not working and you get bizarre error messages it is probably a broken update and possibly duplicate package.
Take in this case "exim" not working even after resetting to defaults.
Check for duplicates:
rpm -aq|grep exim
........
This is useful if you are installing Windows and need virtio but of course Windows needs the virtio driver which is on a second iso.
This is the line of code you would add to your kvm startup script and then you get this iso as second cdrom you can browse to for your Windows install of virtio driver's or whatever other use you need it for.
-drive file=/kvmtemplates/virtio-win-0.1-94.iso,media=cdrom........
What matters most about VPNproviders in 2024?
We are highly suspicious of VERYLARGE VPN providers that have LOW PRICES and HUGE DISCOUNTS. The suspicion is that for those who know what costs are involved to purchase thousands of IPs and servers are not small. At the prices that many of the big mainstream providers offer, it is likely unprofitable or barely profitable. Then, how are those companies making money or is that even the goal?
There use........
Thsi is very handy when doing your own kernel development.
-m specifies how much ram (in the example it is 768MB)
-kernel specifies the path to the kernel file
-net tap,ifname=tap1,script=no (the ifname=tap1 is what you need to change and setup manually).
*Run "tunctl -b" to create a tap device and use the one it gives you for ifname=
Enable networking to the outside like this:
*Note we assume that your bridge is br0 i........
Install the "Flashblock" plugin because we all know most unwanted high CPU usage situations come from the browser usually because of a looping Flash ad taking up 100% CPU.
The solution is to install the "Flashblock" plugin that doesn't allow any Flash to load and play unless you click on the placeholder.........
I messed up the bootloader by accident on a standard Centos 6.3 install because I turned the /dev/vda1 boot partition into an mdadm raid 1. This was all done correctly aside from one point Ididn't realize was an issue metadata=00.90 is the only thing that will allow you to boot (otherwise grub won't work and you won't boot).
So the next step is rescue mode from a CD right? The problem you will find is that grub does not detect your hard drives, this is Ibelieve is be........
The command below will show only files created for the month of 2014-12 but you can of course change the year, month or even specific day or time to suit your needs. The awk command simply just makes it output the list of files created on the date you are looking for.
stat -c "%z %n" *|grep ^"2014-12"|awk '{print $4}'........
Are you getting the same old error message even though your iptables settings for OpenVZ are correct?
iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
The reason is because in newer vzctl the old way of setting IPTABLES="" in vz.conf is completely deprecated (I spent some time fiddling wondering why my settings were correct but........
if you type Export and see something like this:
declare -x all_proxy="socks://127.0.0.1:22000/"
Most sites assume and tell you to check your .bashrc or /etc/profile /etc/bash.bashrc which may not apply if you've unknowingly or forgot that you setup a proxy from your GUI such as Gnome.
To check in Gnome if you have a permanent proxy do the following:
System -> Settings -> Network Proxy........
This is basically caused by upgrading PHPto a new version like 5.4 when you had 5.2 before and an old version of Joomla. The only solution is to upgrade Joomla or downgrade PHP, both of which can be a pain.
Strict Standards: Non-static method JLoader::import() should not be called statically in /home/userdir/public_html/libraries/joomla/import.php on line 29
Strict Standards: Non-static method JLoader::register() should not be ca........
I kept thinking it was esniper but somehow my bash settings have a preset proxy that was creating the issue.
https://signin.ebay.com/ws/eBayISAPI.dll?SignIn: Couldn't connect to server: couldn't connect to host
curl manually to any URL is the same:
curl: (7) couldn't connect to host
Run curl with -vvvvvv mode to see the issue:
curl -vvvvvvvvvv http://realtechtalk.com
* About to c........
It's a basic script that reads the file "ips.txt" in the current directory and then creates a corresponding ifcfg file
#!/bin/bash
GATEWAY=192.168.1.1
NETMASK=255.255.255.0
device=eth0
counter=0
for ips in `cat ips.txt`; do........
It is a permissions issue that is hard to fix.
All but one USB device is greyed out.
I am already a member of "vboxusers"
I have already enabled and disabled USB support for the guest.
I have already reinstalled the latest VBOx guest editions
If running as root it all works fine
Changing........
libguestfs tools howto guide for managing virtual machine images.
libguestfs-tools aka guestfs tools has a lot of tools that make this very easy for you. You can easily mount partitons from an image with some of the commands below.
To mount a partition
#mount the kvmuser102821.img image and the /dev/sda1 partition from it to the local directory "mount"
guestmount -a kvmuser102821.img -m /dev/sda1 mount
........
The solution is to run '/etc/init.d/vboxdrv setup' and sometimes happens when upgrading VBox and the kernel modules don't get upgraded with it. Sometimes the above doesn't work until you reboot because sometimes other unknown processes (even the file manager possibly) may be locking the old module from being unloaded.
Failed to open a session for the virtual machine XP.
The virtual machine 'XP' has terminated unexpectedly during startup with exit code 1.........
You need to use the Samsung driver but specify it as a CLP-360 (this is what I used for my CLP365) and incidentally most of these units look identical on the outside on inside (I've been buying whatever the latest C300 and now 400 unit for years which all seem the same with slightly different features that I never use).
The solution
Once again try specifying earlier models and revisions if the printer doesn't print (it will say it's been sent to the printer bu........
First of all to find your IP you can hold the "X" button for a few seconds and it will print out the DHCP IP.
Another way to find the IP that I prefer is to login to your router or switch and find a hostname that says something like "SEC001599CD2948" which will be your Samsung printer (at least for the C3xx or C4xx series of Samsung printers).
The login and password for Samsung Syncthru Webservice:........
wget http://ftp.gnu.org/gnu/bash/bash-4.3.tar.gz
tar xzvf bash-4.3.tar.gz
cd bash-4.3/
wget --no-directories --level 1 --recursive http://ftp.gnu.org/gnu/bash/bash-4.3-patches/
for patch in `ls bash43-*|grep -v .sig$`; do
echo applying "$patch"
patch -p0 < $patch
done
./configure;make;make install
#it will install to /usr/bin/bash but if your bash is somewhere else you need to overwrite the old one.........
i337 Canada on Bell is hard to root or even install TWRP
Installed TWRP from Odin and my computer gave me the bluescreen at the end but it seemed to be successful (after ODIN said reset).
TWRP mode does not seem to enter, instead you get the Android recovery mode with Volume up + Home
http://galaxys4root.com/galaxy-s4-root/how-to-root-att-or-verizon-galaxy-s4-on-android-4-4-2/
1.)........
This is very annoying and also hard for web developers who want to see how things look on Android. You may be fooled into thinking you have an unclosed bracket or incompatible code but this is the "text inflation feature" which I feel should be disabled by default. It works so inconsitently that one block of text will appear small while the other will be huge and is quite annoying.
The solution is simple
Settings ->Display and &q........
iptables -t nat -A PREROUTING -p tcp -m tcp -d 192.168.2.1/32 --dport 3389 -j DNAT --to-destination 192.168.5.2:3389
iptables v1.4.7: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
The above is often because you don't have the correct modules loaded on the hostnode or enabled for the container but in some cases it's actually a weird openvz setting.
Che........
Aug 25 16:43:24 evohostingtor postfix/master[19471]: fatal: /etc/postfix/master.cf: line 24: field "unprivileged": bad value: "???"
Solution: I had the wrong thick dashes when c&ping (just retype them with your keyboard)
Aug 25 16:47:10 mailbox postfix/master[24498]: fatal: /etc/postfix/master.cf: line 25: bad transport type: syslog_name=postfix/auth-cleanup
auth-cleanup unix n - - - 0 cleanup
#-o syslog_name=postfix/........
The most common solution is to use the /etc/postfix/header_checks but this is a big problem.
Why is header_checks a problem? Because it does it to all mail whether incoming or outgoing and whether authenticated or not. We of course want as much header information for incoming as we can get for many reasons but many organizations want to secure and make their mail clients as secure as possible.
I adapted this solution to the client's custom config, they are configur........
It really seems that 4.4.4 is not ready or stable for the i717 yet and this makes sense since it takes a lot of work/development and testing to get the factory stock ROMs working well. In the end I used the 4.1.2 based Blackstra BlackJelly because it was fast, stable and just works and feels great. The aftermarket support is great but many devs are focussed on adding features and customization that most of us don't want or need rather than getting things smooth and stable.........
There is a weird quirk with how this works, but there is a variable called "src" that defaults to 0 or disabled if not specified as 1.
The default 0 means not to recur billing on a subscription. It's too bad it's not more obvious anywhere nor is there an explanation or warning during payment or after to both the seller and buyer.
Here's a proper subscription code example that does recur and does not cancel........
I struggled with this for awhile because sometimes you have rewritten URLs that you want to pass a query string but most of the info and examples do not support this.
Take a typical example like this:
RewriteRule ^(.*)-(.*)-(.*) /?module=$3&id=$2
You need to add the QSA flag to make it work like below:
RewriteRule ^(.*)-(.*)-(.*) /?module=$3&id=$2 [QSA]
The QSA preserves the original query string but also appends it wit........
https://www.2checkout.com/documentation/notifications/order-created
It shows all the parameters that get passed so you can make a simple script to process it.
To enable 2CONotifications you need to do the following:
Login
Browse to the top right to an icon that looks like a "circle with horizontal lines inside" - Notifications.
Enter the appropriate URL for your IPN/Notification processing script (........
It was hard to find this as I find most online payment processors don't just put the basic information in plain view.
Remember to set your sid (your seller id). The below can easily be turned into a scripted PHP template to integrate into your own custom or existing payment solution.
http://help.2checkout.com/articles/How_to/How-to-Sell-Recurring-Products-with-2Checkout/........
This error seems to happen randomly and especially when trying to send e-mails. Apparently it's a long-standing GNome bug but is also partially the default of Thunderbird depending on who you ask. There is no known fix that I'm aware of except to upgrade gnome and the gvfs package but this is not an option for older versions/distributions.
An error occurred while loading or saving configuration information for thunderbird. Some of your configuration settings may not........
CPanel says you can access 98% of the functions through CLI which experienced Unix/Linux admins prefer for simplicity and for scripting. I've never found CPanel easy to use from the admin panel, it seems everything is hard to find and a simple task becomes a series of hunts.
So for people like me here's the list: http://cpanel.net/system-administrators/command-line-scrip........
vzctl stop ctid
Killing container ...
Child 1033348 exited with status 7
Unable to stop container
vzctl enter ctid
enter into CT 29831 failed
Some have suggested using vzctl stop ctid --fast which does not work.
The only thing that seems to work is restarting the vz service.........
I've only ever seen this in Ubuntu for some reason and it is because of the /etc/nsswitch.conf settings.
So the issue is that if the hostname's reverse DNS cannot be found that you need to go back to DNS which was not the default in this nsswitch.conf file for some strange reason.
Edit /etc/nsswitch.conf and replace your "hosts" line with this:
#hosts: files dns mdns4_minimal [NOTFOUND=return] mdns........
Error: Unable to restore run data (10)
Error: Unable to restore run data (11)
Ikeep getting this error but so far there is no obvious solution. Sometimes I've had to remove the *.hist files so I'll try that again.
*Update
This is an ongoing random problem after months of running webalizer it runs into some problem that can only be fixed by removing the following files so it can rebuild the stats (you end up losing p........
This is still a weird quirk about phpBB, you can allow everyone+guests to see a forum.
What also controls the first layer is this weird built-in "Anonymous" account. You have to actually give that account specific rights to view all the forums or otherwise the above will happen and you'll wonder why your group permissions don't seem to apply.........
Many may ask why would you need to do this? When upgrading from phpBB 2 to 3 the conversion does not keep the admin user you create. If your old admin user has an email address associated that no longer works or is accessible this makes it impossible to reset the admin password.
Some may just say "I'll just manually edit the e-mail address" but it won't work and phpBB will fail to find that user if you don't update the "user_email_hash" field but how do........
-A PREROUTING -d 98.98.98.5/32 -p tcp -m tcp --dport 1050 -j DNAT --to-destination 192.168.1.50:3389
The above forwards port 1050 on IP98.98.98.5 to 192.168.1.50 port 3389 (you can obviously edit things to meet your needs).........
drbd 8.3 hard drive failure recovery
drbdadm attach r0
DRBD module version: 8.3.10
userland version: 8.3.8
you should upgrade your drbd tools!
0: Failure: (119) No valid meta-data signature found.
==> Use 'drbdadm create-md res' to initialize meta-data area. ........
mytop-1.4-2.el5.rf.noarch from rpmforge has depsolving problems
--> Missing Dependency: perl(DBI) is needed by package mytop-1.4-2.el5.rf.noarch (rpmforge)
solution:
#disabling excludes is required on CPanel type boxes which exclude most updates including perl-DBI
yum --disableexcludes=main install perl-DBI
mytop-1.4-2.el5.rf.noarch from rpmforge has depsolving problems
--> Missing Dependency:........
To first start off, there are many misconceptions about NoSQL and especially its strengths and weaknesses.
Even the popular NoSQL solution MongoDB is fraught with issues that no one seems to be concerned about aside from a few but there are serious issues with database integrity and verified writes. MySQL was considered dangerous or incomplete at one point without having the transactional safety features of Oracle for example.
However the NoSQLimplementations seem........
After the "latest" update one of our clients asked us to figure out the issue and it turns out it is related to the mail settings.
Basically all e-mails were being sent with blank text/no body.
The solution
Go to "Setup ->General Settings ->Mail" and just click on "Save" and it will work again.
Note that this assumes you didn't break things yourself by changing any settings. WHMCS may tell y........
http://sourceforge.net/projects/apacheoo-deb/files/debian/dists/wheezy/main/binary-i386/
To install AOO on your computer, you need to add the following entry to the /etc/apt/sources.list file:
deb http://downloads.sourceforge.net/project/apacheoo-deb/debian wheezy main
sudo apt-get update && sudo apt-get install openoffice-en* openoffice-brand-writer openoffice-brand-calc openoffice-brand-impress openoffice-brand-base open........
Apr 17 11:55:47 Cluster01 heartbeat: [1426]: WARN: ha_msg_add_nv_depth: line doesn't contain '='
Apr 17 11:55:47 Cluster01 heartbeat: [1426]: info: >>>
Apr 17 11:55:47 Cluster01 heartbeat: [1426]: ERROR: NV failure (msgfromsteam): [>>>
]
I have never been able to reproduce the above but it happened on heartbeat-3.04-2 when Itook a node down for testing.
One thing Ibelieve caused it was by configuring ha.cf........
I used the matching 8.3.13 utilities and it didn't work but strangely the newer 8.3.16 which makes DRBD complain works just fine.
GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 build by root@sighted, 2012-10-09 12:47:51
0: cs:SyncSource ro:Secondary/Primary ds:UpToDate/Inconsistent A r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:5236960
&am........
c1: warnings being treated as errors
stonith_signal.h:34: error: 'stonith_signal_set_simple_handler' defined but not used
gmake[3]: *** [apcmaster.lo] Error 1
gmake[3]: Leaving directory `/root/rpmbuild/BUILD/heartbeat-1.2.4/lib/plugins/stonith'
gmake[2]: *** [all-recursive] Error 1
gmake[2]: Leaving directory `/root/rpmbuild/BUILD/heartbeat-1.2.4/lib/plugins'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/root/rpmbuild/BUI........
It's always bothered me how Wordpress basically forces the user to provide their hosting credentials to install themes and plugins. How do know for sure the data is not being saved, intercepted and being provided backdoor access to the NSA or other agencies or even just being misused by others with access?
Here's how to close the security hole above and if you're already given Wordpress your credentials make sure you change everything associated it with it. Eg. change your........
#count=10000 makes an image of 10000MB make sure your image is at least the same as your existing
dd if=/dev/zero of=yourimage.img bs=1M count=10000
# losetup -fv newimage.raw
# fdisk -cu /dev/loop0
# kpartx -a /dev/loop0
# dd if= of=/dev/mapper/loop0p1
# e2fsck -f /dev/mapper/loop0p1
# resize2fs /dev/mapper/loop0p1
# a lot of guides tell you to edit /etc/fst........
yum -y install mathtools
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirror.rafal.ca
* epel: mirror.steadfast.net
* extras: mirror.agmn.ca
* rpmforge: repoforge.mirror.constant.com
* updates: centosb5.centos.org
extras ........
Start -> Administrative Tools ->Server Manager
Under "Computer Information" click "Configure Remote Desktop".
Under "System Properties" choose the type of "Allow connections" you want.
That's all there is to enabling RDP Access in 2008 server.........
"Detecting hardware, please wait..."
Solution
This occurs if you are installing with low RAM such as 128MB
Bump it up at least to 512MB for the install........
lvextend -L +10G /dev/kvmvm/w2k8r2evalstandard
Extending logical volume w2k8r2evalstandard to 20.00 GiB
Logical volume w2k8r2evalstandard successfully resized
The above adds 10GB to the logical volume. Of course you must resize the filesystem using other tools to take advantage of the space.........
This problem seemed to happen recently but was likely causing issues before where the phone(s) do not ring.
Now there are a few reasons why this can happen especially if your adapter has DND mode enabled (disable it).
However that wasn't my issue and Ionly figured it out the other day when by fluke if you're on the phone (making a call) then calls will come in.
That's when Ifigured out the solution:
This likely app........
./configure
./configure: line 91: cd: /lib/modules/2.6.32-042stab084.25/build: No such file or directory
Error: kernel version not found.
Please make sure your kernel is configured.
dr-xr-xr-x. 4 root root 4096 Feb 21 06:13 ..
lrwxrwxrwx 1 root root 45 Feb 21 06:13 build -> ../../../usr/src/kernels/2.6.32-042stab084.25
drwxr-xr-x 2 root root 4096 Feb 12 20........
This seems to mainly affect new installs of Windows and especially on XP randomly.
There are whole pages dedicated to the subject but none of them have a simple proper solution.
They and Microsoft say to use "Microsoft Fix It", the only problem is it requires .NET and many new installs of Windows don't have it by default.
The simple solution you asked for
Just reboot Windows and that is how Ifixed it.........
This can happen when you install RPMForge or other repos with the wrong architecture and here's how you fix it (simply uninstalling won't usually fix it):
solution
yum clean all
yum -y install openvpn
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
* base: mirror.its.sfu.ca
* extras: centos.mirror.nexicom.net
* rpmforge: mirror.cpsc.ucalgary.ca
* up........
Iused the slightly older "304.117" version and it worked.
With the newest version Icouldn't get X to start and kept getting these errors in messages/dmesg.
[ 2346.083660] nvidia 0000:01:00.0: irq 44 for MSI/MSI-X
[ 2350.608342] NVRM: RmInitAdapter failed! (0x12:0x2b:1831)
[ 2350.608354] NVRM: rm_init_adapter failed for device bearing minor number 0
[ 2350.608369] NVRM: nvidia_frontend_open: minor 0, module->open() failed, err........
nf_conntrack: table full, dropping packet
The above in some cases I've seen is a sign of a DOS attack or can occur if users are using services like torrenting, proxy, VPNetc... Do not take it lightly as the above can knock a server offline if the table becomes full and I've also seen full crashes and kernel panics shortly after.
........
Error: Package: php-Monolog-dynamo-1.7.0-1.el6.noarch (epel)
Requires: php-aws-sdk
Error: php-pecl-zendopcache conflicts with 1:php-eaccelerator-0.9.6.1-1.el6.x86_64
Error: php-xcache conflicts with php-pecl-apc-3.1.9-2.el6.x86_64
Error: php-pecl-zendopcache conflicts with php-pecl-apc-3.1.9-2.el6.x86_64
Error: Package: php-horde-Horde-Vfs-2.1.2-2.el6.noarch (epel)
&n........
kernel:[735188.961824] Kernel panic - not syncing: Fatal exception in interrupt
Write failed: Broken pipe
I'm not sure what is causing this and have never seen it on any server before.........
root@hkhosting [/]# service httpd start
Starting httpd: Syntax error on line 2 of /etc/httpd/conf/httpd.conf:
Invalid command 'Alias', perhaps misspelled or defined by a module not included in the server configuration
........
It's not as simple as "yum install" as you can see below and it doesn't stop there.
yum install php53
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* rpmforge: mirror.us.leaseweb.net
* extras: centos.mirror.rafal.ca
* updates: centos.mirror.nexicom.net
* base: centos.mirror.nexicom.net
* addons: centos.mirror.nexicom.net
Setting up Install Process........
I was worried the server was hacked, I was logged in already as root but couldn't login to CPanel or a new SSHsession. I even reset the password from the shell and it did not work still.
The reason is CPanel Hulk, it detected a brute-force attack so it locked down the root account entirely even from the correct password. According to cPanel the best way around this is to whitelist your IP.........
There was an error creating the child process for this terminal
Failed to create pipe for communicating with child process (Too many open files)
I get this when trying to open a new tab or new window even. I've had far more sessions open (literally dozens)before without getting this error.........
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (720x1280 fourcc=34504d46 [FMP4])
[mpeg4 @ 0x2c91c00] timebase not supported by mpeg 4 standard
Could not open codec.
FATAL: Cannot initialize video driver.
That is the error I would get, I thought it was a codec error something else. By fluke Isaw something about ffmpeg where someone recommended manually telling it to the "fps" and it worked.........
On some CPanel installs we see complaints of "/usr/local/cpanel/bin/apache_conf_distiller" causing 100% cpu usage without any solution.
Killing the process causes it to spawn again, actually it seems it tends to spawn multiple processes itself.
Restarting CPanel itself is a temporary but not permanent solution.........
[3805108.257042] sd 0:0:0:0: [sda] 1953525168 512-byte hardware sectors: (1.00 TB/931 GiB)
[3805108.257052] sd 0:0:0:0: [sda] Write Protect is off
[3805108.257054] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[3805108.257066] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[3805108.257083] sd 0:0:0:0: [sda] 1953525168 512-byte hardware sectors: (1.00 TB/931 GiB)
[3805108.257090] sd 0:0:0:0: [sda] Write Protect is off........
Just in case anyone is wondering that is the case, it can make troubleshooting impossible if you're making changes to php.ini but don't realize the webserver must be restarted for those changes to apply (contrary to running php-cgi which always looks up the current .ini settings).........
I was having an issue with only certain random/jpeg files with the functions imagecreatefromjpeg imagecreatetruecolor and other related ones.
This issue was annoying basically it seems like a libgd issue/bug with newer versions of PHP and it was difficult to trace-out. One very useful thing that helped me was using "php-cgi" and passing the query string as an argument eg:
php-cgi images.php source=IMG.jpg (that way you get all the error messages wh........
Kernel panic - not syncing: Attempted to kill init!
Pid: 1, comm: init Not tained: 3.2.51-3.el6.x86_64 #1
Call Trace:
panic+0x8c/0x1a2
forget_original_parent+0x34d/0x360
exit_notify+0x12/0x140
do_exit+0x1d8/0x400
do_group_exit_+0x50/0xc0
sys_exit_group+0x12/0x20
system_call_fastpath+0x16/0x1b
panic occurred, switching back to text console........
-A PREROUTING -p tcp -m multiport --dports 10000,18080,13306 -j DNAT --to-destination 192.168.5.83........
wget http://download-location
sudo tar xjvf thunderbird-24.2.0.tar.bz2 -C /opt
ln -s /opt/thunderbird/thunderbird /usr/bin/thunderbird
[sudo] password for one:
ln: creating symbolic link `/usr/bin/thunderbird': File exists
sudo rm /usr/bin/thunderbird
ln -s /opt/thunderbird/thunderbird /usr/bin/thunderbird
The above is how Idid it, if you don't do it properly you'll find that you are still using the old version (........
Services -> Services
"Static Leases"
Fill out an empty line:
MAC Address
Host Name
IP Address
Those first 3 fields are mandatory, if you miss it then the changes will be lost even if you try to save.
Make sure you've d........
This server has been running for weeks without issue, it's currently only using 1 of 2 CPUs as it is running in the office as a test bed (mainly due to the handle 12 bay storage/great for testing HDDs). The errors below seem to mainly be from AMD CPUs, it's only happened a single time and in the days since Igot that error it hasn't occurrred.
Interestingly enough /proc/cpuinfo still shows all 4 cores of the CPU (Opteron 2373 Quadcore HE) and the functionality doesn't seem........
Fatal error: Out of memory (allocated 6291456) (tried to allocate 7680 bytes)
This is usually caused by Wordpress, Drupal or other ridiculously inefficient CMS' out there, as a temporary fix you can increase PHP's memory limit but it's best to find the actual culprit, by disabling add-ons and other scripts etc...........
yum -y install fail2ban
vi /etc/fail2ban/jail.conf
[asterisk-tcp]
enabled = true
filter = asterisk
action = iptables-multiport[name=asterisk-tcp, port="5060,5061", protocol=tcp]
sendmail-whois[name=Asterisk, dest=you@example.com, sender=fail2ban@example.com]
logpath = /var/log/asterisk/messages
maxret........
Trying to load: pxelinux.cfg/default
boot: _ (why does the cursor flash so long before entering the PXE Boot menu?)........
Dell CS24-NV7
Unusually the Virtualization was enabled when I got this server but all the NICs were diabled in the BIOS including PXE boot!
Advanced -> Advanced Chipset Control
PCI Slot 1 Option ROM: Enabled
Onboard LAN1 Control: Enabled
LAN1 Option ROM Scan: Enabled (you need it for PXE boot)
Onboard LAN2 Control: Enabled
LAN2 Option ROM Scan: Enabled
*you will need to reboot and........
When manually running it for some reason it decided to ask for/use the CD as a source whichInever set.
Disabling the CD as a source stops this from happening, otherwise apt-get will keep respawning and use 100% CPU.........
user the "--spider"switch and you can see what it would do.
wget -r --spider dontryrealtechtalk.com........
somestring="309sfjlks39889d"
removelast="${somestring%?}........
This happened after a customer migrated their hosting and the issue was being unable to access PHP sessions.
Warning: session_start(): open(/var/lib/php/session/sess_3e0oms763m6mrqekdnnmodlhs3, O_RDWR) failed: Permission denied (13) in /register.php(202) : eval()'d code on line 1
Solution:(use the correct ownership/permissions)
chown apache.apache -R /var/lib/php........
Example:
basename /var/log/messages
messages
As shown above the "basename" utility gives you the end filename separately.
dirname /var/log/messages
/var/log
As shown above the "dirname" utlity gives you just the utility even if you pass it a specific file.
The above two utilities are very helpful in Bash scripting when working with files and directories co........
./configure
./configure: cannot locate gcc 3.x. please install it or specify with --qemu-cc
yum -y install gcc make
./configure
./configure: cannot locate gcc 3.x. please install it or specify with --qemu-cc
yum -y install compat-gcc-*
./configure
Error: Could not find alsa
Make sure to have the alsa libs and headers installed.
yum -y install alsa-lib-devel
./configure........
Here is a handy script that will check all processes and report what is swapping
#!/bin/bash
for pid in `ps x|awk '{print $1}'`; do
result=`cat /proc/$pid/status|grep VmSwap|awk '{print $2}'|grep -v ^"0"`
if [ ! -z "$result" ]; then
programresult=`ps x|grep $pid|grep -v grep`
if [ $? == 0 ]; then
program=`echo $programresult|awk '{print $5}'|grep -v ^grep`........
mount -o bind /proc /sda2/proc
mount -o bind /dev/ /sda2/dev
mount -o bind /sys /sda2/sys
chroot /sda2
mint / # mount -o bind /proc /sda2/proc
mint / # mount -o bind /dev/ /sda2/dev
mint / # mount -o bind /sys /sda2/sys
mint / # chroot /sda2
mint / # cd ~
mint ~ # ls
Desktop
mint ~ # cd /
mint / # ls
bin Desktop dev-temp home&nb........
Linux box13. 2.6.32-042stab076.5 #1 SMP Mon Mar 18 20:41:34 MSK 2013 x86_64 x86_64 x86_64 GNU/Linux
even setting privvmpages to a specific setting DOES not affect "free -m" in containers.
This is probably a kernel issue
23:36:29 up 159 days, 7:12, 4 users, load average: 0.42, 0.44, 0.33
[root@box13 ~]# free -m
total&n........
Sipura / Linksys PAP/VOIP/SIP Adapter Issue
Can't receiving incoming phone calls and you're behind a NAT router (99% of people)?
1. Login to the adapter.
2. Click on "Advanced" (location varies but usually somewhere on top)
2. Click on "SIP"
3. Scroll down to "NAT" (usually at the bottom).
You'll find 2 columns with 4 rows of drop-down boxes (they'........
Add this to htaccess:
Options +Indexes
After that people will be able to browse files and directories of your site.........
Starting container...
vzquota : (error) Quota on syscall for id 42131: No such file or directory
vzquota on failed [3]
Solution
cd /var/vzquota
mv quota.42131 quota.42131-disable
vzctl start 42131
Starting container...
Initializing quota ...
Container is mounted
Adding IP address(es):
Setting CPU units: 1000
Container start in progress...
........
02:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS (rev 08)
03:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS (rev 08)
Basically these cards are a stripped-down version of Dell Perc 6/i only they (SAS 6/ir) support JBOD.
The DellPerc 6/i are basically useless because it doesn't have JBOD support and requires software or BIOS commands to add or remove........
Everyone should be running with safe_mode on in /etc/php.ini (on Centos) as it makes exploiting your system more difficult is PHPcan't execute anything on the system if a script is exploited.
For example with Safe_Mode on the only executable files on the system are ones in the safe_mode_exec_dir = /safephp
This is crucial, if you must execute anything from PHPthen you have to copy the binary and assign to the user that Apache runs your site under.&........
PHP5 Centos 6 displays part of code from PHP file for some scripts
Solution
edit /etc/php.ini change short_open_tag = Off to:
short_open_tag = On
Then restart Apache and it should be resolved (assuming the scripts failing used )
........
This example involves an Aterisk message log of about 26GB, but with any server it usually does not get deleted until the server is stopped/restarted:
asterisk 13729 root 6w REG 0,41 27277943090 59097971 (deleted) /var/log/asterisk/messages
So if you've deleted a bunch of large logs, make sure you restart the server for them to regain your space.
........
/scripts/phpextensionmgr install PHPSuHosin
Updating md5sum list
Fetching http://httpupdate.cpanel.net/cpanelsync/easy/targz.yaml (connected:0).......(request attempt 1/12)...Resolving httpupdate.cpanel.net...(resolve attempt 1/65)...
Fetching http://httpupdate.cpanel.net/mirror_addr_list (connected:0).......(request attempt 1/3)......connecting to 74.50.120.123...@74.50.120.123......connected......receiving...100%......request success......Done........
The first is a dual CPU AMD Opteron 2373EE (4 cores x 2) and I think it did bad because it has some old 250GB SATAs which can only do about 65MB/s max sequential reads. I think it should have blown away the second (AMD X4 640 Quad Core).
[root@fs12home unixbench-4.1.0-wht-2]# ./Run
make all
make[1]: Entering directory `/root/unixbench-4.1.0-wht-2'
Checking distribution of files
./pgms exists
./src exists........
relay=alt4.gmail-smtp-in.l.google.com. [74.125.136.26], dsn=4.0.0, stat=Deferred: 421-4.7.0 [ 10] Our system has detected an unusual rate of
This is strange because the mail server IP is not blacklisted anywhere and the IP itself has not been used for years and this server is clean and has only sent a few e-mails to gmail.com in its entire time.
I wonder if this is a legacy block on a whole range of IPs as punishment for others in the block........
I've got one of these for testing projects from work at home and got more than I bargained for with the time I've spent on it due to the storage handing/Perc 6/i cards.
My particular model came with the following:
2U Rack Mount Server with Rails
2xOpteron 2373 EE (Quad Core, there is a 6-core version that can be found at times)
16GB RAM
2 x 250GB Seagate SATA
2 x Dell Perc 6/i (horrible and a nightmare to work........
One thing to remember is that you need MegaCli to do the flashing.
You also need the correct file,I tried at least 2 different Perc 6 firmwares from Dell that kept getting rejected as corrupt by MegaCli(they were really the wrong version). I have an external PCI-E Dell 6 Perc/I butI chose images from the 'Integrated" on motherboard version as it was allI could find. They are different, and below is my first time finding success.........
I flashed an LSI Logic firmware to it and it broke the BIOS (cannot do Ctrl+R) for booting purposes but allows other functionality to work normally.
I tried downgrading to a Dell firmware for Perc 6i but it won't work, not even with MegaCli
wget http://downloads.dell.com/FOLDER00416606M/1/SAS-RAID_Firmware_W83M2_LN32_6.3.1-0003_A14.BIN
--2013-08-26 12:53:39-- http://downloads.dell.com/FOLDER00416606M/1/SAS-RAID_Firmware_W83M2_LN32_6.3.1-0003_A14.BIN
Resolvi........
LSi Megaraid
At first it was configured as a RAID 0, then I deleted the Virtual Disk Group.
I thought both drives would be shown and detected in Linux as sda and sdb but it actually shows nothing.
To make them work you have to hit Ctrl+R before the system boots (when prompted) and create a Virtual Disk Group. In my case I created each one as RAID 0 (with a single drive only) as I just wanted JBOD but there is no such option or default in these Dell Pe........
rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
rpm -ivh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
Retrieving http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
Preparing... ########################################### [100%]
1:rpmforge-release #############........
rkhunter --update
Running updater...
Mirrorfile /var/rkhunter/db/mirrors.dat rotated
Using mirror http://rkhunter.sourceforge.net
[DB] Mirror file : ERROR
Fatal error: Problem while fetching file
........
pxe-32 tftp open timeout
The solution was to enable tftp in xinetd with "chkconfig tftp on".
See the troubleshooting below:
chkconfig --list
NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off
acpid 0:off&n........
CPanel ->Basic cPanel &WHMSetup
At the bottom you'll see them, set the nameservers you want to use and the corresponding A record if needed.
Then all new domains will use those settings/nameservers.
It's strange that there's no section for this specifically.........
http://support.godaddy.com/help/article/668/registering-your-own-nameservershosts?pc_split_value=1
Log in to your GoDaddy Account.
Click on "My Account" at the top left.
Click on "Domains".
Click on the "Launch" button for the domain you want to create the nameservers for.
Find........
Add a DNS Zone
Results of adding zone
Sorry, you must enter a domain. Please try again.
Fill this out at the top (Imissed it)
Domain Selection
Ip Domain
The issue was I didn't realize the form above had to be used,I thought it should work where you click on the user, domain and then click on the submit button and you'd go to the next step. But it doesn't, you need to........
Bash weird variable whitespace missing
var=`cat tlds.csv|grep .ca,`
# echo "var=:$var:"
:ar=:.ca,Canada
Why is the v missing in the last line?
It should be
:var=:.ca,Canada
instead of
:ar=:.ca,Canada
I noticed a problem with the file with doing a "cat -v" on it.
Here's the issue, the file contains carat M ^M:
.vg,British Virgin Island........
zonetemplate=$(cat ........
iptables -t nat -A PREROUTING -p udp -m multiport --dports 20,123,443 -j REDIRECT --to-port 53
getsockopt failed strangely: Invalid argument........
yum update error
Traceback (most recent call last):
File "/usr/bin/yum", line 29, in ?
yummain.user_main(sys.argv[1:], exit_code=True)
File "/usr/share/yum-cli/yummain.py", line 229, in user_main
errcode = main(args)
File "/usr/share/yum-cli/yummain.py", line 145, in main
(result, resultmsgs) = base.buildTransaction()
&nbs........
This happens when su'ing to a user and running screen
screen Cannot open your terminal '/dev/pts/0' - please check.
Solution (not secure for a shared server)
chmod 777 -R /dev/pts
........
This is basically URL decoding to the decimal code but nothing in PHPworks how you'd expect it.
Here are online tools to verify and check your work, it's important when querying databases with non-English characters:
http://yehg.net/encoding/index.php#
http://meyerweb.com/eric/tools/dencoder/
http://www.codetable.net/decimal/65398
Japanese:
http://symbolcodes.tlt.psu.edu/bylanguage/japanesechartkatakana.html
Charat code for PHP:........
for ip in `cat fixlist.txt`; do
sudo -u apache ssh root@$ip "`cat iptablesrules.sh`"
done
In the above example we are going to execute the commands within the local file "iptablesrules.sh" on all the machines in "fixlist.txt". This is a great way of performing server maintenance in a clustered or cloud environment.........
open /dev/kvm: No such file or directory
failed to initialize KVM: Operation not permitted
[ 96.084502] kvm: disabled by bios
Any of the above means that "Virtualization" is not enabled in your BIOS. Most servers and Desktops (non-mainstream) can do this no problem but leave it off by default. Note that some systems even though the CPU supports it, don't allow enabling of Virtualization for some reason (especially some lap........
package kernel-xen-2.6.18-274.7.1.el5.x86_64 is intended for a x86_64 architecture
Linux etc 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:06:34 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
As you can see above architecture and kernel is 64-bit but I had to force it to install using "--ignorearch"
Solution
#rpm --ignorearch -ivh kernel-xen-2.6.18-274.7.1.el5.x86_64.rpm
Preparing...&nb........
These drives seem to die very easily during shipping:
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
sd 0:0:0:0: [sda] CDB: Read(10): 28 00 18 8b 65 e0 00 00 08 00
end_request: I/O error, dev sda, sector 411788768
sd 0:0:0:0: [sda] Unhandled error code
sd 0:0:0:0: [sda] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
sd 0:0:0:0: [sda] CDB: Read(10): 28 00 18 8b........
The error itself "mkdir(): Too Many Links" is not very useful, but I'll translate it into plain English.
It means you've reached the filesystem's limit of how many directories can be created in a single directory.
In this case for ext3 the limit is 32000 and it was exceeded.
What's the solution?
The simple solution is to move those directories into more subdirectories possibly sorting them by date, alphabet or numerically.........
This is important if you need public access to internal IPs such as at your office and don't want to use a VPN just to SSHinto different servers:
Below forwards the port "10001" to the IP192.200.5.53 on port 22 (of course adjust it to your needs).
iptables -t nat -A PREROUTING -p tcp --dport 10001 -j DNAT --to-destination 192.200.5.53:22
Remember to enable MASQUERADE on your NAT IPs or they won't be able to talk to the outside world (........
Crashing with a RAID 1 array and when burning a CD.
Screen goes blank (no video signal) and system stops responding during heavier loads.
Is this a defective power supply or is it possible I have too many devices connected to the same rail?
How can I verify/troubleshoot this?........
I installed Ubuntu 11.04 for testing purposes but I couldn't even download SSH server:
sudo sed -i -e 's/us.archive.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
After running the above make sure you do a "apt-get update"
Note with the above that Ihave the search string of "us.archive.ubuntu.com" change it to whatever is in your sources.list
The above does not fix all repositories either, I haven't had a chance t........
This is a great way to test and experiment without risking your current table, or to make a backup of your current table to avoid corruption or dataloss due to malicious activity eg. deletion etc..
There are two steps and two commands
1.)Copy Table Structure
"cars_backup" is the new table and it will be a copy of the table called "cars"........
SELECT column_name
FROM information_schema.columns
W........
Jun 12 10:30:53 kernel: [724514.291670] EXT4-fs error (device md20): ext4_add_entry: bad entry in directory #2552670: rec_len % 4 != 0 - offset=216, inode=2553603, rec_len=94, name_len=84
Jun 12 10:30:53 kernel: [724514.292400] EXT4-fs error (device md20): ext4_add_entry: bad entry in directory #2552670: rec_len % 4 != 0 - offset=216, inode=2553603, rec_len=94, name_len=84
This happened when an unprivileged user was backing up a Windows filesystem, once they ha........
Make sure that the Page mode is set to landscape and that the columns fall within the margins/boundaries, otherwise this is why there will be blank pages (Print Preview will show you this too).........
openoffice calc landscape printing problem
OpenOffice.org 3.2.1
OOO320m19 (Build:9505)
ooo-build 3.2.1.4, Ubuntu package 1:3.2.1-7ubuntu1.
It's not extending the printing and margins all the way to the edge even when setting the Page and print settings to Landscape
Solution (incorrect margins set under Page):
*Check the margins, my right margin was like 14cm!........
Another new drive bad from the start:
Jun 2 15:14:18 one-desktop kernel: [15895.386779] ata2.00: exception Emask 0x50 SAct 0x1 SErr 0x280900 action 0x6 frozen
Jun 2 15:14:18 one-desktop kernel: [15895.386782] ata2.00: irq_stat 0x08000000, interface fatal error
Jun 2 15:14:18 one-desktop kernel: [15895.386784] ata2: SError: { UnrecovData HostInt 10B8B BadCRC }
Jun 2 15:14:18 one-desktop kernel: [15895.386788] ata2.00: cmd 60/0........
Have you ever unplugged the wrong drive and then had to rebuild the entire array? It may not be a big deal in some ways but it does make your system vulnerable until the rebuild is done.
Many distros often enable the "bitmap" feature and this basically keeps track of what parts need to be resynced in the case of a temporary removal of a drive from the array, this way it only needs to sync what has changed.
To enable bitmap to speed up rebuilds and sync........
find / -name 'thedirectorytofind' -type d
That's all there is to it and now you don't have to get a listing of all the files along with it.
Another cleaner solution that supports wildcards is the following
find prep-*/dvd-slideshow_temp*/ -type d
........
This happened to a customer Asterisk server and it somehow found the ID of the registration account to the upstream SIP server and was railing connection attempts (it filled up the console and there were literally thousands per second). Basically this caused all incoming and outgoing calls to fail.
It was a temporary fix but the solution was to block that specific IP, it's hard to stop it 100% because the customer needs the default SIP port.........
I'm using ecryptfs and was suddenly unable to access or even ls my home directory (but every subfolder is accessible). It just hangs and throws this message in messages/dmesg:
Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO
I read somewhere that perhaps some file or folder is owned by root somehow, sure enough there are some and sudoing to root allows me to........
This is just trying to read 5GB off the drive with dd and the drive initially tested ok but shortly after I wondered why I was seeing 2MB/s read speeds. Notice the "current_pending_sector", anytime I've seen it at anything above 0 even with no other bad fields/attributes, it means the drive is bad.
ata1.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x0
ata1.00: irq_stat 0x40000008
ata1.00: failed command: READ FPDMA QUEUED
ata1.00: cmd 60/00:00:........
This is the most I can get when plugging in a hard drive hot and only on some power connectors.
[71656.314271] ata5: exception Emask 0x50 SAct 0x0 SErr 0x90a02 action 0xe frozen
[71656.314277] ata5: irq_stat 0x00400000, PHY RDY changed
[71656.314285] ata5: SError: { RecovComm Persist HostInt PHYRdyChg 10B8B }
[71656.314294] ata5: hard resetting link
[71660.360686] ata5: softreset failed (device not ready)
[71660.360694] ata5: applying........
Once I set a new MAC address everything was fine and finally anything can be pinged etc.., I've had this happen with many clients in different datacenters on different hardware.........
After some fsck issues I can't boot my Centos 6.4, this just keeps repeating over and over.
init: tty (/dev/tty2) main process (1031) terminated with status 1
init: tty (/dev/tty2) main process ended, respawning
Disabling SELinux through Single User mode fixed this.........
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
bind-address=127.0.0.1
The key is "bind-address", set that to 127.0.0.1 and no one from outside the server can connect.........
mysqldump: Couldn't execute 'show create table `general_log`': SHOW command denied to user 'user'@'localhost' for table 'general_log' (1142)
One of my clients almost found out the hard way, here is an unlikely situation that happened.
1.) Years ago the client had another VPS to which they backed up a BLOG nightly to an .sql file, what they forgot is that the file also contained all databases (they used the --all-databases option but forgot). So imagi........
foreach ($_POST as $key => $value) {
if ( $key != submit )
{
$values.="$key=$value<........
This is useful for developing a lot of applications, I'm putting it here to keep it handy for myself and hopefully others:
Choose CountryCanadaJapanUnited StatesUnited KingdomAfghanistan........
This is something many people and especially businesses worry about, or at least they should. Before throwing away a hard drive, returning a hard drive, or especially Warrantying/RMAing it, you should wipe the drive.
Linux provides the "shred" and "dd" utlities which work quite well. It seems even a single pass is good enough but by default shred will do 3 passes.
Here's an example of using shred in Linux (I use a custom made distribution from........
I find it very annoying that this mouse has buttons on the side where you grip it and the left one goes back in the browser and the right one goes forward. Imagine if you're filling out a form and hit it, most forms/websites have no protection against it.
Source: http://ubuntuforums.org/showthread.php?t=2065400
Here's how I fixed it with xinput, it's too bad there's no good standard GUI to........
service mysql start
Starting MySQL. ERROR! Manager of pid-file quit without updating file.
Solution
killall -9 mysqld_safe
killall -9 mysqld
service mysql start
Starting MySQL SUCCESS!........
If you make changes to /etc/sysctl.conf (which are permanent and not lost during reboot) but want them to apply with rebooting just use the following command:
sysctl -p
After that your changes will be enabled.........
smartctl -a /dev/sda
smartctl version 5.36 [i686-pc-linux-gnu] Copyright (C) 2002-6 Bruce Allen
Home page is http://smartmontools.sourceforge.net/
Device: ATA WDC WD1600YS-01S Version: 20.0
Serial number: WD-WCAP03024940
Device type: disk
Local Time is: Mon Apr 29 21:40:07 2013 PDT
Device does not support SMART
Error Counter logging not supported........
If you move your hard drive(s) around to other computers/servers, you'll find that your eth0 keeps getting higher, the first time it will become eth1 and then eth2 etc and even higher if your server has dual or quad NICs. The reason is that udevd basically assigns eth0 tot he first NIC it finds and remembers it, if it encounters a NIC with a differentMAC, it assigns it one higher (eg. eth1).
See the example below, I have eth2 now so how doI fix it?........
Client Log
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 192.168.1.253 [192.168.1.253] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/identity type -1
debug1: identity file /root/.ssh/id_rsa type 1
debug1: identity file /root/.ssh/id_d........
Kernel panic - not syncing: Attempted to kill init!
Pid: 1,comm: init Tained: G I------------- 2.6.32-358.el6.x86_64 #1
Call Trace:
[] ? panic+0xa0/0x16f
[] ? do_exit+0x862/0x870
[] ? fput+0x25/0x30
[] ? do_group_exit+0x58/0xd0
[] ? sys_exit_........
After booting the net install, eg. over tftp here's the format you need to install the OS when it asks for the URL:
http://mirror.centos.org/centos-6/6.4/os/x86_64/
Obviously change the URL and path to match the architecture and version that you're looking for and you'll be good to go.........
start=1
increment=5
lines=`cat linesfile.txt|sed -n "$start","$increment"p`
The secret here is the power of sed.
Basically the example above would take the first 5 lines from the file. You could change it though to say take 20 lines starting from the 5th line by adjusting the start and increment values.........
Solution To The Following:
yum -y install zlib-devel
yum -y install e2fsprogs*
*** Cannot find /usr/include/et/com_err.h. (yum install libcom_err-devel) ***
Installation didn't pass, halting install.
Once requirements are met, run the following to continue the install:
cd /usr/local/directadmin/scripts
./install.sh
Common pre-install commands:
http://help.directadmin.com/it........
mdadm --manage /dev/md3 --add /dev/sda1
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdd2[1] sdd1[2](S)
31270272 blocks
md3 : active raid1 sda1[2] sdb1[1] sdc1[3](F)
943730240 blocks [2/1] [_U]
[>....................]........
I chose this because I heard a lot of stories about scams and that many providers I contacted said they can't unlock the Canadian I717s (one said "my Bell server" is down).
This method worked perfectly on my Bell I717M and should work for all I717 in Canada, I was able to insert a foreign SIMcard. This will work abroad too but remember entering CWM mode is different for I717's in other countries (at least theUS).
Step 1 - Root + CWM........
Here's a proven example of what a bad hard drive can do, it was technically functioning OKin a RAID array but the system became extremely low and the load become high and IOWAIT was even higher and I always thought it was a bad application. The truth is that this failing 1TBHitachi has slowly gotten worse and caused huge slowdowns, (eg. 100% load on Thunderbird waiting for e-mails to load etc..). After swapping it out, tabs change instantly, emails are not lagged, and........
This was partitioned as a single 32GB VFAT but when I inserted it into the phone it said that it can't read it and now here is how the partition table looks. Interestingly enough the data works and reads fine from the computer still.
Disk /dev/sdb1: 32.1 GB, 32085360640 bytes
64 heads, 32 sectors/track, 30598 cylinders, total 62666720 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum........
Step #1 - Create Wrapper Script
vi /usr/local/bin/phpsendmail
#!/usr/bin/php
........
This pops up when connecting the phone and it doesn't seem to charge. The phone keeps showing a status message every few seconds "Connected as a media device".
It's ridiculous why this phone doesn't just default as a simple USB Mass storage device.
Here's what I see in /var/log/messages:
Jan 30 18:51:27 QuadCoreAM2 kernel: [18038228.144046] usb 1-3: new high speed USB device using ehci_hcd and address 24
Jan 30 18:51:28 QuadCoreAM2 ke........
This seems to be a verified bug on KVM with no solution. I wasn't able to get through the installer with Ubuntu 12.04, it would crash while "configuring apt". I was able to install it with Ubuntu 12.10 but it crashes randomly at times.
This happens with the latest Centos 6.3 kernel and KVM package, I even compiled the latest version from the KVM website and used that, but the results are still the same.
Here's some links to discussion about the bugs:........
Tools -> Options -> OpenOffice Writer -> Table
Uncheck "Number Recognition"
This will permanently disable it but won't undo the damage it has already done. I spent a long-time fighting with this horrible feature which should be disabled by default.........
sensors|head
i5k_amb-isa-0000
Adapter: ISA adapter
Ch. 0 DIMM 0:+115.0°C (low = +127.5°C, high = +127.5°C)
Ch. 0 DIMM 1: +63.5°C (low = +127.5°C, high = +127.5°C)
Ch. 0 DIMM 2: +61.0°C (low = +127.5°C, high = +127.5°C)
Ch. 1 DIMM 0: +65.0°C (low = +127.5°C, high = +127.5°C)
Ch. 1 DIMM 1: +75.0°C&........
cat | grub --device-map=/dev/null
Now pay close to the attention of the beginning.
Type: "device (hd0) VPS.img" this is telling what hd0 will be to GRUB and we're telling it the disk image file "VPS.img" in the current directory is hd0, you can specify alternate paths and image names of course.
GNU GRUB version 0.97 (640K lower / 3072K upper memory)
[ Minimal BASH-li........
This booting error is because the Xen PV guest image uses the Xen kernel, this is not compatible with anything but a host running a Xen kernel.
I did a kpartx -av virtual.img and then it created some partitions that showed up in fdisk.
I mounted it and did a chroot into it and removed the xen kernel and installed a normal kernel but Xen still shows the same kernel in Grub (only the Xen one).
This is strange but it seems like this Xen PV guest has some sort of hidden or........
I closed program by program untilI found the culprit, it's baffling how the cause was Thunderbird but then again it does use a lot of memory and I have thousands of messages between dozens of mailboxes.
But still I don't think this should happen and Xorg shouldn't allow this either.
So for those who have mysteriously high CPUusage from Xorg start closing program by program until you find the culprit.
The interesting thing is that after reloading it, the Xor........
Inever started these processes but they are from a custom based bootable Linux I've made and I've never seen this behavior on other machines or even with the same machine using different kernels. These processes seemed to spawn on their own and I have no idea why and even worse why the CPU usage is so high?
Here's the output from top:
907 extaudit 30 10 0 0 0 R 90.7 0.0........
Cannot load certificate file keys/server.crt: error:0906D06C:PEM
The .crt is blank empty because when generating it I kept hitting enter for the defaults and this caused the crt not to be signed.
Certificate is to be certified until Dec 18 00:35:49 2022 GMT (3650 days)
Sign the certificate? [y/n]:y
1 out of 1 certificate requests certified, commit? [y/n]y
So if you get messages like these, a........
Let's keep this simple, it's horrible, not only is the picture quality horrible (it's not a big deal) but the keyboard input is an issue. You have to type slowly, lightly and carefully otherwise 1-keystroke could end up being dozens of keystrokes.
It's also a confusing unit for many datacenter techs, I've seen these units hooked up wrong and the instructions themselves aren't clear. I had to resort to shipping one to my office and take my phone pictures of the setup for th........
I've run into two issues with Lantronix based KVMs on various servers and here's how I solved them (with that said I like these units as they are Java based and OS independent and work very well, unike some other models like Startech).
1.) If you are connected by USB only and you're sure USB support from the BIOS is enabled, you just need to click the following in Lantronix
Interfaces -> Keyboard/Mouse
Check "Force USB Full Speed Mode", this fixed the issu........
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_12-lv_root
50G 1.2G 46G 3% /
tmpfs 7.8G 0&nb........
This is something I often setup for clients because it's very helpful for people in datacenters, this allows custom OS installs on demand, you can customize it more by using kickstart etc.. but here's a base I use before customizing more:
This little script below will install everything you need to get booting by PXE Linux.
It also assumes you set a local IP (be sure not to overwrite your existing IP) on eth0:0 (note the :0) as 192.168.1.10 and it........
In my case I already copied the VIDEO_TS folder to my hard drive.
Here is the command for mencoder:
mencoder -dvd-device "myvideobackup/VIDEO_TS" dvd:// -ovc xvid -oac mp3lame -lameopts cbr:br=128 -xvidencopts pass=2:bitrate=-700000 -o myvideobackup.avi
Replace "-dvd-device myvideobackup/VIDEO_TS" with the location of your backup files or the /dev device of your DVD drive.
The -o myvideobackup.avi is of course the name o........
I've used rsync again for this because I found it very simple, I've only excluded the Cache directory since it's not necessary and could be several GB in size.
rsync -Phaz --exclude=Cache/* user@remotehost.com:/home/user/.mozilla/firefox/profile.default/* /home/user/.mozilla/firefox/ec1n9opl.default/
This is a great way once again to get going how you were on the old/remote computer fairly quickly. It even restores all of your history in........
The best way is to use rsync, I've set it up so it doesn't copy unnecessary files, or at least ones I'm sure aren't needed.
Here is the rsync command Iused (adapt to your specific Thunderbird profile location):
rsync -hazv user@remotehost.com:/home/user/.thunderbird/sbrer.default/* /home/user/.thunderbird/4nyb0.default/ --exclude=global* --exclude=Cache --exclude=ImapMail --exclude=Mail
This is a great way to get your e-mail accounts going on a new c........
Here is a quick script that works on most Centos versions to disable the virus/SELinux from blocking basic functionality.
The first echo 0 statement disables SELinux instantly but it will still be enabled on reboot.
The second line disables it permanently.
#!/bin/bash
#disable SELinux Immediately
echo 0 > /selinux/enforce
#disable SELinux Permanently
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config........
qemu-kvm-1.2.0]# ./configure
Disabling PIE due to missing toolchain support
glib-2.12 required to compile QEMU
Solution install glib2
*Don't confuse glib2 with glibc, they are different and it may catch some off guard.
yum -y install glib2*
After that KVM should compile and install just fine.........
This seems to be common for some reason when trying to run Windows 7 under KVM and 7 has always had strange issues with KVM. What happens for me is after the install it simply won't boot, it stays on the POST screen and does nothing.
For some reason it appears the boot sector either doesn't get installed or gets corrupted with KVM.
The solution is to boot the install disc for Windows 7 and reinstall the windows MBR into the boot sector:
1. Boot t........
qemu-img create -b centos.5-8.x86.20120308.qcow2 -f qcow2 ../kvmguests/25000-centos5.8x86.qcow2
Formatting '../kvmguests/25000-centos5.8x86.qcow2', fmt=qcow2, backing_file=centos.5-8.x86.20120308.qcow2, size=10485760 kB
-b the source/base image
-f format is qcow2 and the location of the destination image
What is so special about this? It's even quicker than creating a template with OpenVZ but this is an actual OS.
It saves time a........
mdadm --manage /dev/md1 --add /dev/sdb1
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: /dev/sdb1 not large enough to join array
md1's first primary member /dev/sda3 has 57394 cylinders while the /dev/sdb1 has 57393 (1 less cylinder) which is why it won't work.
fdisk -l /dev/sda3
Disk /dev/sda3: 47........
This error in my experience is user error although CPanel doesn't help, this message doesn't give you much to go on.
Let's talk more about the process of setting up SSL with CPanel.
Your site must have a dedicated/non-shared IP to even have the option of creating an SSL Certificate.
You must create a Private Key (do not delete this private key!)
You must create a CSR (Certificate Signing Request)
Use CSR to create cert........
The size of the message you are trying to send exceeds a temporary size limit of the server. The message was not sent; try to reduce the message size or wait some time and try again. The server responded: 4.5.3 Error: too many recipients.
We set this in main.cf:
smtpd_client_recipient_rate_limit=0
We didn't specify it before and the default is said to be 0/unlimited and it still didn't change anything.........
ip tunnel add tun3 mode gre remote 192.58.1.5 ttl 64
ioctl: no such device
I solved this on Centos by loading the ip_gre module:
modprobe ip_gre
On Debian I believe it is the "sit" module.........
parted sdc.img
GNU Parted 1.8.8
Using /home/one/sdc.img
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit&nb........
A lot of people become nervous (and understandably so) when checking their auth or security logs, in Centos /var/log/secure and see dozens, hundreds of even thousands of attempted logins to various services, especially SSH.
Of course you could manually block these people/IPs but no one has time to read the logs like that, what if some program or script could do it for you?
This is what denyhosts does for you, it checks the logs and based on a certain number of failed SSH attem........
I backed up everything in the /mnt/sd_card directory thinking that some dataloss could occur for some reason but purposely left my microSDHC unbacked up thinking that "it won't touch that since it's external" and Samsung's and other manufacturers website even say this (that it won't be affected and not to worry etc).
Apparently I was wrong, my microSD was "undetected" and asked to be formatted after the upgrade (there goes 3-months worth of family photos). No........
This may sound silly but there will be conflicts/issues with the default Centos repository so you have to use a third party like remi (I prefer not to do this but it's the only option unless you migrate your sites/data to another server or can stand some downtime-not an option IMHOon a production server).
You may need to upgrade to PHP5.3 to run Joomla or many other reasons.
Your host needs to use PHP 5.2.4 or higher to run this version of Jo........
The best way I could figure out is to use another guest of some sort to do this, while assigning the disk that needs to be resized to the same guest.
So say we have /dev/xvda as the guests drive and we've booted it up.
We also have /dev/xvdb (this is going to be the image/disk to be resized).
In this case it's based on an ext3/4 image.
Run e2fsck on it to ensure there are no filesystem errors.
e2fsck /dev/xvdb........
JFolder::create: Could not create directory
Plugin Install: Failed to create directory:
This can occur when trying to upload content or when installing themes/templates.
It's usually not a permissions issue per say but doing a 777 (which is very insecure) will fix it. But the real problem solution is that the owner of the files is different than the owner of the Apache process/server.
Eg. if your Apache is running as user "apache........
ERROR 1045 (28000): Access denied for user 'contentmanager'@'localhost' (using password: YES)
For fun I thought I'd reset the password:
GRANT ALL ON thecontent.* TO contentmanager IDENTIFIED by 'dfdfsdfdsfsdfsd';
ERROR 1470 (HY000): String 'contentmanager' is too long for user name (should be no longer than 16)
This is ridiculous that this new version has some bizarre 16 character username limit and not only that but i........
This array is a RAID 1 and in this case 1 of the 2 drives failed (a WD drive and I've found them to be the weakest and most unreliable of any brand and are easily damaged/DOA when shipping them).
mdadm --manage /dev/md0 --add /dev/sdb1
The above assumes the array you want to add to is /dev/md0 and the device we are adding is /dev/sdb1
*One thing to remember is to make sure the partition you are adding is the correct size for the array. You can also g........
Directadmin Error when changing user settings/saving
Details
Error with system Quotas
setquota: Mountpoint (or device) / not found. setquota: Not all specified mountpoints are using quota.
Debug Guide
You have to disable and enable the quota's using vzquota on and off.
After that it will work.........
Neither the blkid or the UUID internal to mdadm work to automount for some reason in Debian
partprobe doesn't work but was a good suggestion from: http://pato.dudits.net/2008/11/03/special-device-uuidxxxxxxxxxxxxxxxx-does-not-exist-especially-with-lvm
mount: special device /dev/disk/by-uuid/431b9b96-29e8f298-e89bd504-7065bddd does not exist
mdadm -D /dev/md_d12
mdadm: metadata format 00.90 unknown, ignored.
/dev/md_d12:
&nb........
This is just how I like things, quick and simple through CLI (command line) using gifsicle for free.
gifsicle --colors 256 --delay=200 --loop banner.gif banner-page2.gif > banner.gif
banner.gif = the first page of the banner
banner-page2.gif = the second page
--delay=200 ms to switch between the two
--loop=it goes back and forth between the two pages forever
banner.gif=the resulting animated gif.
There are many other opti........
I am running a 64-bit host and was running a 32-bit XPguest which was crawling no matter what I was doing with it,in fact it frequently used 100% CPU power while having no real work load. I experienced with this other guests and wondered why KVM was slow compared to say Xen or Virtualbox.
This is because you need to use the "-cpu" flag.
For a full list of options run:
/usr/libexec/qemu-kvm -cpu ?
x86 ........
Replace "Administrator" with your username.
C:Documents and SettingsAdministratorLocal SettingsTemp
Ihave often found several gigabytes of temporary files in there! Just be warned that they may not all be deletable if the files are being used by open programs (so close everything you can).
This helped me in a pinch many times when for apparently no reason gigs of disk space are being used for an unknown reason.........
VBoxManage modifyhd XP.vdi --resize 15000
VBoxManage modifyhd XP.vdi --resize 15000
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
That resizes the virtual hard drive image "XP.vdi" to 15000MB instantly.
I doubt this is safe to do while the VM is running and I'm not sure if it would attempt it still but turn the VM off first to be safe.
I also notice in the VBOX GUI that it still shows the orig........
After about 15 tabs I believe, they become hidden on the right side and are accessible only by furiously clicking the "right arrow" and even then it takes forever and honestly this hidden tab feature seems to slow down everything.
If you enter "about:config" in your browser without the quotes just set this value to get rid of this annoying (one of many new) feature from Firefox (set it to false and restart your browser):
services.sync.prefs.sync.brows........
So you've just purchased your SSL cert, renewed it and installed it or maybe you've had it installed and working fine all the time with all other browsers but you've upgraded to a recent version of Firefox and suddenly get the warning "Error code: sec_error_unknown_issuer" error.
This is terrible since if you bought an SSL cert, you are most likely using it for trust purposes for your business and obviously that message will scare away most potential customers.........
iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
This solution applies to all other iptables modules/problems for OpenVZ, you'll just need to add them to both lists/lines below if you have modules other than what I have below.
The modules need to be enabled in both iptables and the OpenVZ hostnode itself and then the containers which need it must be restarted.
How To Enable IPTables Modules in OpenVZ........
I searched for days after getting my Galaxy Note and couldn't find a way to do this (at least not without buying programs for either Android/Windows). All I read was ways to sync and import the contacts to GMail but I don't want to use GMail for privacy reasons. GMail/Google steal all of your personal information and use it for whatever purposes they want to and may sell or release it to who knows where (I don't care what their policy says but this stuff happens), just like the default........
It's really silly how DA doesn't enable SSL by default but is otherwise a stable, fast and secure control panel.
Here's a copy and paste way of enabling SSL for Directadmin in just a few seconds:
*setup SSL
openssl req -x509 -newkey rsa:1024 -keyout /usr/local/directadmin/conf/cakey.pem -out /usr/local/directadmin/conf/cacert.pem -days 9999 -nodes
That creates the public certificate and private key pair in the location Directadmin expects to fi........
[ 12.460014] ata1: SRST failed (errno=-16)
[ 17.626677] ata1: link is slow to respond, please be patient (ready=0)
[ 22.480011] ata1: SRST failed (errno=-16)
[ 27.646681] ata1: link is slow to respond, please be patient (ready=0)
[ 38.106817] ata1.01: failed to IDENTIFY (INIT_DEV_PARAMS failed, err_mask=0x80)
[ 48.266676] ata1: link is slow to respond, please be patient (ready=0)........
I've encountered this problem before and I believe it may affect other drivers (I could test but I don't have time). This was happening on my custom Linux system with the pcnet32 driver.
pcnet32: eth0: transmit timed out, status 97fb, resetting (and some other kernel module tracing in dmesg)
Basically it means the card is connected (it shows connected in full duplex etc.. and recognized if the cable is disconnected too) but no packets can be sent or received........
*************************************
* *
* All parts have been installed *
*........
wget -N http://httpupdate.cpanel.net/latest;sh latest
That one command above will do it all (and it takes a long time to install/compile). After that you can access CPanel with your root login information by visiting https://yourdomain-or-ip.com:2087
I personally don't like CPanel (bloated, full of bugs, no shared SSL, difficult to use etc..)but I admit it's easier to install than........
I experienced this with CPanel's Exim after an auto-update (a Google of this error produces lots of complaints with few clear solutions). In this case I'll put the solution at the top.
Run /scripts/buildeximconf to rebuild the Exim config and it should be fine after that.
mail -vs "from test" user@dest.com < .bash_history
LOG: MAIN
cwd=/root 4 args: send-mail -i -v user@dest.com
LOG: MAIN
&........
Type "about:config" in your browser and then search for "Quit"
Set these values to true
browser.showQuitWarning
browser.warnOnQuit........
For years I've always built cheap systems believing that there is little difference in more expensive components when it comes to reliability and quality, I generally believe this still except for Power Supplies.
I've always bought cheap cases with nice sounding 350-550W stock/cheap/crap power supplies and haven't had any issues for the most part until recently.
One such case is an NGEAR case with a 550W Optimax power supply, I always read that these supplies don't produce the........
I've thought for awhile that Asus has been banking on its years old reputation for quality amongst gamers and enthusiasts and I think I'm right. My Asus VE247H Monitor with a supposed 2MS refresh rate has 1 red/stuck/dead pixel but fortunately it can only be seen on a non-true black picture or against a blue screen.
I have several Asus products and find they're all of fairly poor quality. First of all their motherboards have given me the most issues of any brand, they te........
When double clicking nothing happens/it doesn't open and when executing as ./firefox-bin you get this error:
./firefox-bin: error while loading shared libraries: libxul.so: cannot open shared object file: No such file or directory
All the .so files reside within the directory of Firefox that you extract from the binary .tar.gz from Mozilla, it's just that your computer doesn't know/recognize where to look for them.
Solution:........
I'm running Ubuntu 10.10 with Asus NVIDIA GT430
2.6.35-32-generic-pae #65-Ubuntu SMP Tue Jan 24 14:06:16 UTC 2012 i686 GNU/Linux
Nvidia binary driver: 260.19.06
The screen sometimes completely freezes and locks up or everything starts going very slow:
[1903398.100007] NVRM: os_schedule: Attempted to yield the CPU while in atomic or interrupt context
[1903402.373210] NVRM: Xid (0001:00): 53, CMDre 00000000 00000080 00000000 00000005 00........
fdisk -lu VPS.img
last_lba(): I don't know how to handle files with mode 81ed
You must set cylinders.
You can do this from the extra functions menu.
Disk VPS.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End ........
One of my test Centos 5 containers was on a partition that filled up and it threw all sorts of errors and stopped responding but now I can't boot it again anymore.
All the console shows is the Linux Penguin on the top left corner and the xm console says "usbcore: registered new driver hub" and has halted there.
Centos 5 Xen container stuck/frozen won't boot on "usbcore: registered new driver hub"
Another great way of troubleshooting is booting fro........
This is what I call a ridiculous bug in compiz that causes it.
The solution/To fix it just install "compizconfig-settings-manager"
Open it up and Navigate to General Options -> Display Settings
Set the "Refresh Rate" to the current refresh rate of your monitor.
For ATI cards with slow window dragging/response supposedly disabling "Sync to VBlank" fixes that but otherwise leave it as is.........
I dread updating the kernel and rebooting to find the Ubuntu graphics aren't working and you have to manually intervene. This is usually because Ubuntu for whatever reason didn't update the drivers you need (eg. the manually compiled Nvidia Kernel driver that MUST be recompiled for each and every kernel update unfortunately).
The most common reason may be that "linux-source" hasn't been installed automatically on my system. I tried to manually reinstall the........
I really am a Linux fan but my comments here may not show it. Although I'm quite familiar with Linux CLI to administer servers, I find Linux GUI OS's like Ubuntu at times very clunky.
This is partially because there's no such thing as a "self-made" Linux from scratch where the UIwas designed by a single team. Linux is made up of several different projects that are generally completely separate and this lack of integratiion is a key issue that makes things f........
This is one in a series of weird things whichIthought was motherboard related (I RMA'd the motherboard), the RAM tests fine with memtest86 and I used badblocks on both RAID 1 members with no errors and smartctl is happy with them.
Basically the array crashes the kernel a lot and has issues when writing.
[112322.723465] md0: rw=0, want=14958668696, limit=1887460480
[112322.731077] attempt to access beyond end of device
[112322.731087] md........
This is a very basic method and won't work in all cases but will reduce the chance of torrenting/abuse by your server users.
iptables -A INPUT -p tcp --destination-port 6881:6999 -j REJECT
iptables -A OUTPUT -p tcp --source-port 6881:6999 -j REJECT........
I used the suggested script to bridge from OpenVPN and it took my client's server off-line! Don't ever use their "sample" scripts if you don't have another way of accessing the server than SSH.
I actually found it easier to use iptables to tell it to route IPs based on a certain subnet to route through eth0:
iptables -t nat -A POSTROUTING -s 192.168.200.0/24 -o eth0 -j MASQUERADE
Replace "192.168.200.0/24" with your subnet of cour........
It really is as simple as:
cdrecord -v dev=/dev/sr0 pathtoyourisoimage.iso
-v is for verbose, I prefer it but if you don't you won't see as much output like below (I like to know the details and exactly what's happening)
dev=/dev/sr0 specifies the device name of your burner (they say not to use it and to specify some weird annoying device string but using the raw /dev has always worked for me and is how it should have been implemented from the start IMHO)........
Even in new versions of Ubuntu this happens but for me I found out it was because of one feature under "Power Management".
I had "Spindown hard disks when possible" ticked, after disabling that, my computer wakes up from suspension every time now. So if your computer won't unsuspend with any version of Ubuntu/*Nix try disabling the spin down hard disk option as it's obviously the culprit for many situations.........
*Make sure that the ownership is 501.501 or mobile.mobile when copying back (especially if using ssh or sftp as root on the iPhone) otherwise things will break. Eg. the contacts will be blank even after trying to update due to incorrect ownership/permissions.
iPhone Notes Location/Restore:
/private/var/mobile/Library/AddressBook
AddressBookImages.sqlitedb AddressBook.sqlitedb
Once you restore the contacts and restar........
Visit http://linux.softpedia.com/get/Programming/Interpreters/Android-32340.shtml
Basically copy and paste all of that below and you'll have installed and started the Android SDK before you know it.
wget http://dl.google.com/android/android-sdk_r12-linux_x86.tgz
sudo apt-get install openjdk-6-jre openjdk-6-lib openjdk-6-jre-headless
tar -xvf android-sdk_r12-linux_x86.tgz
cd android-sdk-linux_x86/tools
./android........
gocr works great and it's simple, just invoke it like so:
gocr filename.png
The output will be printed to the screen.
My only complaint/concern is that even with standard terminal output (not scanned) from a printscreen, gocr does make mistakes by inserting extra spaces where they don't belong, mistaking letters for numbers etc.. but it's definitely enough to be readable and figure out what you're looking at.
I haven't tested yet with scanned input........
These were caused by a bad stick of Corsair RAM
[] free_hot_cold_page+0xfc/0x150
[] __pagevec_free+0x14/0x1a
[] release_pages+0x127/0x12f
[] __pagevec_release+0x15/0x1d
[] __invalid_mapping_pages+0x120/0x156
[........
The first Hitachi Deskstar 2TB 5K3000 drive I bought arrived DOA for whatever reason (not recognized by the BIOS or OS). Perhaps it was shipping since I bought only 1 hard drive. When I bought 4 through another Vendor, all 4 checked out fine.
I was worried about the RMA process because a lot of people have complained about Hitachi taking weeks to send out their hard drive and almost implied the warranty is useless.
I'm happy to report that my experience was great a........
carat M isn't this symbol ^ that you think, it can only be produced by typing "Ctrl-v, Ctrl-m". That you might see in text files saved from Windows.
tofrodos is the package that has dos2unix which is basically the same scripts that replace ^M with /n
tofrodos is the Debian/Buntu package name which has the dos2unix and unix2dos binaries........
The normal solution would be as follows:
export DISPLAY=:0.0
/usr/lib/vino/vino-server &
But what happens if that doesn't work? I haven't been able to find much documentation about how to find the list of displays and how their numbering works in Xorg.
Sometimes you'll get this error when trying to restart vino:
Cannot open display:
For some reason my display is not on 0.0........
This is very annoying, the only known fix is to install vim
apt-get install vim
After that everything works as normal.........
Within vi if you can't exit /etc/vim/vimrc you can type
:syntax off
And to turn it back on:
:syntax on
Many of us have a dark/black background in our terminal/shell making the default syntax unreadable, the solution is to either turn off syntax highlighting with :syntax off or to enable a special option in /etc/vim/vimrc
Edit /etc/vim/vimrc
The "syntax on" enables the highligh........
It may be hard to find by Googling by it's really quite simple and quicker than reading dozens of man page entries.
sed -n 5p somefile.txt
Just replace the 5 with whatever line you want to be printed.........
Have you ever found a website/page that has several or perhaps dozens, hundreds or thousands of files that you need downloaded but don't have the time to manually do it?
wget's recursive function called with -r does that, but also with some quirks to be warned about.
If you're doing it from a standard web based directory structure, you will notice there is still a link to .. and wget will follow that.
Eg. let's say you have files in http://serverip/documen........
The solution to this screen issue is simple.
This happened to me in Centos 5 as a user, but I also su'd to it and I don't have any password for it.
I've read some people say this is more common when su'ing.
The solution is simple though, just give others rw access to the corresponding pts whether it's 0,1,2 etc..:
As root do
chmod o+rw /dev/pts/2
........
A few days ago this happened on multiple Centos 5 servers and apparently anyone using rpmforge was affected by this error and there was no solution other than disabling that repo to fix it.
To some this highlighted a few points, that there is a reason RHELexists with full paid support, and also that this could be a vulnerability and huge flaw with yum. A yum search or install should not segfault just because the rpmforge repo goes down.
Fortunately it came back up........
dd if=/dev/sda of=/dev/null creates ever increasing load every second.
After minutes the load has moved up to 4.79
I've tried with two different discs in my system.
I wonder if it's a delay or problem with the SATA bus because one drive I have connected has recently failed.
I notice when drives fail that you get some IO/blocking issue when they don't respond properly.
Yes I believe it was, because here's the same disc after removing the dead........
ifup eth0
SIOCSIFFLAGS: Cannot allocate memory
Failed to bring up eth0
This is on a Centos 5.5 machine with OpenVZ kernel 2.6.18-238.12.1.el5.028stab091.1PAE, I updated 3 systems with the same hardware to the same kernel and for some reason the network didn't come back.
This only happened once the first time I booted into the new kernel and hasn't happened again but this is a serious issue for those running systems from remote locations such as a datacente........
This may not apply to everyone but here is what happened to me.
One day my IP connectivity for one container went dead, I could ping the hostnode from it and the hostnode could ping it but there was no external routing. I restarted the network service but it didn't help.
I checked the routing table inside the VPS and the host and everything looked normal. Iadded another different IPon the same subnet to the container and it worked. Right away I st........
Starting online migration of CT 25000 to 192.168.5.1
Preparing remote node
Initializing remote quota
Syncing private
Live migrating container...
Error: Failed to suspend container
CPT ERR: f68cf000,25000 :foreign process 15755/14731(vzctl) inside CT (e.g. vzctl enter or vzctl exec).
CPT ERR: f68cf000,25000 :suspend is impossible now.
CPT ERR: f68cf000,25000 :foreign process 15755/14731(vzctl) inside CT (e.g. vzctl enter or........
I had a system running a 128MB live CD image with 2.8 gigs of available RAM and the OOM kernel killer went crazy when using dd for more than 8 minutes and kept killing everything. I've read that this is due to a low-memory issue and paging in the kernel and 32-bit systems with lots of RAM.
I even enabled swapspace on my LiveCD and the issue happened 25 minutes into dd rather than 8 minutes, so what gives?
Also no swap space was ever used!
cat /proc/s........
I like dd, although it only reads it, usually a read test of the entire disk will uncover if your hard drive is bad in some parts. This is a good thing to do at least once a month, a lot of times bizarre program behavior, laginess and crashing/unnmounting problems etc.. are due to a failing disc and SMART won't know it or indicate a problem:
We must also remember there's never a guarantee, I've found that ever since we moved to larger and more platters per drive with 1TB drives........
I had a dying drive that smart thought until it totally disappeared was a good drive, and actually all parameters did look fine but this system was causing my system to lockup and other bad behavior:
=== START OF INFORMATION SECTION ===
Device Model: WDC WD20EARS-00MVWB0
Serial Number: WD-WMAZ20139
Firmware Version: 50.0AB50
User Capacity: 2,000,398,934,016 bytes
Device........
Warning: Unable to open /dev/fd0 read-write (Read-only file system). /dev/fd0 has been opened read-only.
That's a very annoying error, it's simply because Centos for some reason thinks it's wise to load the "floppy" kernel module, who has a floppy drive? I haven't seen or used a floppy for over 12 years!
It's more than just annoying, if you probe the drives attached to your system, eg. with grub or partprobe, it keeps trying to locate a flopp........
It's weird because I have a nearly identical box and setup and I can update the ovzkernel-PAE* just fine but on this box it doesn't work.
I only get this error with the openvz.repo and not others such as Centos-Base.repo
With my other server it works normally:
================
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package ovzkernel-PAE.i686 0:2.6.18-238.12.1.el5.0........
GNU GRUB version 0.97 (640K lower / 3072K upper memory)
[ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename.]
grub> root (hd1,0)
Filesystem type is ext2fs, partition type 0xfd
grub> setup........
I had one of these shipped and it was not recognized when plugged in, here's what a dead drive looks like (I assume it's teh circuit board which is dead):
ata1: link is slow to respond, please be patient (ready=0)
ata1: softreset failed (device not ready)
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1: link online but device misclassified, retrying
ata1: link is slow to respond, please be patient (ready=0)
ata1: softreset f........
This assumes that you've at least created the correct partition for your DRBD already.
Notice that I am "diskless", that's because either your DRBD partition doesn't exist/has been renamed (eg. sdb becomes sda when sdb dies and you reboot) or because that drive is really actually dead/gone.
*If you need to permanently change the partition/device for your resource be sure to edit /etc/drbd.conf on both hosts and reload the config.
(replace r0 with........
I thought only a faster CPUand SSDwould help but I already have a Quad-Core CPU and it wasn't being maxed out. The actual tests were performed on an AMD-V enabled 128MB dual core VMWare container though.
There is a flag that can be passed to make in order to start multiple threads, by specifying 4 threads I was able to reduce the whole kernel compilation time from scratch by about 50%! (65minutes vs 31minutes!). *Yes I did do a make clean before each co........
One thing to note about DNS servers and providers is that they aren't always trustworthy, not even if they're Google or your favorite ISP. Any DNS server can compromise your privacy, and they are likely tracking your browsing habits and keeping logs of it. Sometimes it's for Marketing/Research purposes such as Google's GMail service which they admit is scraped/datamined. I would expect nothing less from their DNS service.
The other danger with such widely used and pu........
In file included from drivers/block/cciss.c:1015:
include/asm-generic/pci-dma-compat.h: In function `cmd_special_free':
drivers/block/cciss.c:196: sorry, unimplemented: inlining failed in call to 'cciss_tag_discard_error_bits': function body not available
include/asm-generic/pci-dma-compat.h:25: sorry, unimplemented: called from here
make[2]: *** [drivers/block/cciss.o] Error 1
make[1]: *** [drivers/block] Error 2
make: *** [drivers] Error 2........
May 6 08:16:57 devbox spamc[16225]: connect to spamd on 127.0.0.1 failed, retrying (#2 of 3): Connection timed out
May 6 08:17:02 devbox spamc[20214]: connect to spamd on 127.0.0.1 failed, retrying (#1 of 3): Connection timed out
spamc[16225]: connect to spamd on 127.0.0.1 failed, retrying (#3 of 3): Connection timed out
First make sure that the spamd service is actually running, this is your spamd (spamassassin server) cannot be reached. In my c........
(98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
This will even trip you up if you have a service like monit to save you if httpd crashes. The only way to fix this is to either wait (it's not an option for production situations) or to kill the ghost httpd processes that wouldn't gracefully close:
So........
If you have a webserver and find you have high IO/lagginess MySQL is one of the first things to check. It turns out MySQL was my problem and it was creating a high load on my server, especially for IO.
How to Enable MySQL Slow Query Logging To Find Slow Performance/Queries
vi /etc/my.cnf
Add this anywhere under [mysqld]
#slow queries
log-slow-queries = /var/log/mysql/mysqlslowqueries.log
long_query_time = 1........
mod_status is a great way to track down the source of high CPU usage and to find what vhost/script is the cause of it.
It gives you a live view of bandwith usage, CPU usage, and memory usage broken down by domain/vhost and script/URI.
Enable mod_status
vi /etc/httpd/conf/httpd.conf
ExtendedStatus On
SetHandler server-status
Order Deny,Allow
Deny from all
All........
yum -y install vnstat
chown nobody.nobody -R /var/lib/vnstat/
#replace venet0 below with your desired interface
sudo -u nobody vnstat -u -i venet0
#edit: vi /etc/sysconfig/vnstat
#VNSTAT_OPTIONS="-i venet0"
# only use the sed below if you are using venet0 instead of eth0 or replace accordingly
sed -i 's/eth0/venet0/g' /etc/sysconfig/vnstat
[root@monitor]# yum install vn........
I was getting frustrated with trying to write a simple URL like this:
/example-withdash
I used the htaccess code like this:
Rewriterule ^example-withdash$ / [R=301]
I also tried escaping the dash which I thought should have treated it as a literal but that didn't work either:
Rewriterule ^example-withdash$ / [R=301]
But it wouldn't work, apparently the "-" dash means don't substitute,........
Error Detected........
http://www.datsi.fi.upm.es/~frosal/
SHC is a program written by the author above that does just that, it's a great little tool to have.
Some have said it isn't exactly encrypting the code but just making it hard to read by obfuscating the code.
There was also a good discussion about that here:........
This happened during a RAID array check:
SMART says both drives pass the test, but I'm doing a long test on them and hopefully this is not a hardware error.
Apr 3 04:22:01 remote kernel: md: syncing RAID array md2
Apr 3 04:22:01 remote kernel: md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
Apr 3 04:22:01 remote kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction.
Apr........
mysql errors even though these files do exist:
110405 13:21:37 InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name ./ibdata1
InnoDB: File operation call: 'open'.
InnoDB: Cannot continue operation.
110405 13:26:15 InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means my........
My Samsung drive failed on me, at first I thought it was the enclosure but a direct SATA connection causes the same problems for discs that are inserted. It will work fine for a few minutes but then starts spewing the errors below.
I've never been a fan of Korean made optical drives and have always had trouble with them. The problem is that I don't believe NEC and Lite-ON make drives anymore, and I considered them the leaders.
Apr 7 11:58:48 bo........
You need to enable the httpd daemon with monit to actually view the status and control, it's not only for the web interface since the httpd is theONLY way of controlling monit and viewing the status.
monit monitor all will also reinstate disabled services if they've timed out too much. Just restarting the service will do nothing to re-monitor a service that monit has stopped monitoring due to too many failures.
*Also note that /etc/monit.conf i........
I don't have a solution other than to use rsync, I used diff on about 1.7TB of data which includes hundreds of thousands if not millions of small files to ensure nothing was missing or corrupt.
diff didn't even get past the first large directory without spitting that error out.
Keep in mind I used "diff -r" because that means recursive, otherwise it wouldn't compare all files and subdirectories and would be a false way of doing it.........
My mother needed a new laptop and I recommended her the same one I would have bought myself or my wife, that means the cheapest possible laptop with the most features for the money.
This HP shines at this price point and one thing that made me stay away from buying more and recommending HP/Compaq was the poor battery life. Not anymore, this model has an industry leading up to 4 hours of battery life.
Key Factors for Choosing It:
HDMI Out........
After Installing pgina I couldn't login to Windows anymore with my blank password Administrator account!
An unknown error has prevented your account from being created.nrThis may be due to policy or security settings as well as other machine configuration.nrPlease consult your administrator.
Hit F8 to start Windows in Safe Mode and you can login normally and then remove PGina, it shouldn't cause this problem or behavior out of the box.........
convert -density 400 somepdf.pdf -scale 2000x1000 output.jpg
The key is the "-density 400" switch and also -scale 2000x1000
To give credit I found the solution here: http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=10928
That was the perfect solution when I was frustrated with how small the resulting JPG's resulted. I'm sure this will help a lot of people when it comes time to converting a PDF to JPG which I'm amazed Imag........
drup 6.2 install
$cd drupgoodinst3883/
[ drupgoodinst3883]$ ls
CHANGELOG.txt cron.php index.php INSTALL.pgsql.txt INSTALL.txt MAINTAINERS.txt modules robots.txt sites update.php xmlrpc.php
COPYRIGHT.txt includes INSTALL.mysql.txt install.php LICENSE.txt misc&........
high IO wait
424 root 39 19 1900 848 552 D 0.0 0.0 0:00.91 updatedb
root 424 0.0 0.0 1900 848 ? DN Mar11 0:00 /usr/bin/updatedb -f sysfs?rootfs?bdev?proc?cpuset?binfmt_misc?debugfs?sockfs?usbfs?pipefs?anon_inodefs?futexfs?tmpfs?inotifyfs?eventp........
Santrex Review/Scam/Complaint
Santrex never provided any working server, I believe it was just a dummy management Solus server because the server said it was booted but never connected to the console. I complained to them and eventually the support admitted the server was not working and to wait for 24 hours. I waited for 4-days, after which they sent an e-mail saying my service was being disabled for SPAM ...(when SolusVM shows 0kb of traffic). Th........
/tmp/J_5JHKXU.bin.part could not be saved, because the source file could not be read.
Try again later, or contact the server administrator.
This is actually not a download problem related to the server/site you're using but actually some weird bug with Firefox. I know because no matter what site I tried to download from this error kept happening.
Simpy restarting Firefox was enough to get things working again.........
Virpus Review/Scam/Complaint
Virpus is advertised on LEB (lowendbox.com). My initial payment was refunded after days of not receiving the VPS, but two subscrption payments went through and Ionly received notification after the second one. They ignored the requests in the ticket and by e-mail for a refund and even escalated the PayPal dispute that "we're assuming this is for a service that was provided" (when they obviously know otherwise by........
There are all kinds of threads and links on the internet, and this seems to be a contentious issue butI don't know why.
95th percentile is either a good deal for some or a big rip off for others, Ijust said it there :)
But the reality is that for MOST people who transfer low amounts of data but burst to higher speeds such as 40mbit+ even for short periods of time, then you'll pay a lot of money to do that.
Basically 95th percentile is an-old archaic method........
find what MPM Apache is using, it will either be using "worker" or "prefork"
apachectl -l
Compiled in modules:
core.c
prefork.c
http_core.c
mod_so.c
In my case it is "prefork"
vi /etc/httpd/conf/httpd.conf
Find the section that looks like this (by default one will normally exist for prefork and for worker, but in my case I only care a........
kernel 2.6.27.54
Fusion MPT base driver 3.04.07
Copyright (c) 1999-2008 LSI Corporation
Fusion MPT SPI Host driver 3.04.07
mptbase: ioc0: Initiating bringup
mptbase: ioc0: WARNING - Unexpected doorbell active!
mptbase: ioc0: ERROR - Doorbell ACK timeout (count=4999), IntStatus=80000001!
mptbase: ioc0: ERROR - Diagnostic reset FAILED! (102h)
mptbase: ioc0: WARNING - NOT READY!
mptbase: ioc0: ERROR - didn't initialize proper........
These are the only two I've encountered but here is the low-end and note my story is not at all unique.
In my case I was scammed out of money and did not receive any service at all from either company.
Santrex Review/Scam/Complaint
Santrex never provided any working server, I believe it was just a dummy management Solus server because the server said it was booted but never connected to the console. I complained to them and eventually the support adm........
Centos 5 Postfix and SPAMASSASSIN Tutorial
yum install spamassassin
chkconfig spamassassin on
vi /etc/mail/spamassassin/local.cf
##############
#required_hits 5
#report_safe 0
#rewrite_header Subject [SPAM]
#5 is the least restrictive (means only the most obvious SPAM is caught. 0 is obviously the most restrictive/sensitive and would have lots of false positives
require........
NOTICE[11389]: rtp.c:1808 ast_rtp_read: Unknown RTP codec 100 received from
I've found that trying several times may work, but I also read changing your Sipura VOIP adapter settings as follows helps (but it still fails for me sometimes):
In adapter change the following under SIP/Advanced
Codec to G711a from G711u
Passthru Method from: NSE to ReINVITE
FAX CED Detect Enable: Yes
FAX CNG Detect........
I'm posting this because it wasn't easy or obvious how this would be accomplished and the man page leaves it to guesswork.
Multi-line body_checks
Example 1
/........
ls
ls: error while loading shared libraries: libtermcap.so.2: cannot open shared object file: No such file or directory
This is not an ldd problem or case of anything missing, this only happened after I upradedUbuntu.
declare -x PATH="/home/user/bin:/usr/local/bin:/usr/bin:/bin:/usr/games"
"/home/user/bin" is the problem! It's weird because I have no idea how it happened.........
I bought the 1TB Deskstar C revision recently at just $49 each and put them in RAID 1for my Desktop.
Look at how close the old Deskstar 1TB comes to matching the performance of the mor expensive Samsung and WD's?
This is phenomal, I can't believe the performance I've gotten out of these cheap drives.
http://www.tomshardware.com/reviews/hitachi-western-digital-terabyte,2017-6.html........
Use "ImageMagick" which can be installed easily on most UNIX/Linux distros.
Remember that it will go with the standard file listing to determine the order but I believe you can manually specify multiple jpg's in the arguments.
Convert image/jpg to PDF
convert *.jpg yourpdf.pdf
This is a very handy and free tool.
Convert DOC/TXT documents to PDF
If you wanted to convert a .doc file or text........
When migrating away from Plesk I couldn't figure out an easy way to get a straight list of all e-mails, but here is where I found the solution:
http://nakuls77.wordpress.com/2008/08/30/details-of-email-ftp-database-users-from-psa-database/
mysql> SELECT mail.mail_name, accounts.password, domains.name FROM mail, accounts, domains WHERE domains.id=mail.dom_id AND mail.account_id=accounts.id;
mysql> SELECT CONCAT(mail.mail_name,’@’,domains.name) AS Em........
Amarok won't play songs, keeps skipping to the next
Some say install install phonon-backend-xine
but it was already installed automatically, obviously that's not the problem or solution.
Settings -> Configure Amarok
Playback: Configure Phonon
Audio Output: Music
It should show your different audio interfaces, choose Pulse Audio and move it to the top of the list, do the Apply, OK and manually quit Amarok (remember to close it from the tra........
I right clicked all applicable cells and chose "number" but that's enough.
I notice when I click the cell there is an invisible ' in front of the number:
'33.64
Calc imported my CSV and decided to add a ' in front of the numeric currency values!!!*Actually the problem occurs when you right click the cells and change the type from text to number, no matter what format you choose.
If I change it to be currency i........
don't delete /var/lib/mysql/ib_logfile0 or ibdata1 or mysql won't restart
I didn't realize they were internal and not part of replication like the relay files!
/usr/libexec/mysqld: ready for connections.
Version: '4.1.22-log' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
110127 16:31:00 [Note] /usr/libexec/mysqld: Normal shutdown
110127 16:31:00 InnoDB: Starting shutdown...........
The first thing you need to remember is not to check from the same host/server itself. This is a silly mistake I made, the reason is that many mailservers and especially postfix are configured to allow relaying from the localhost/same host. If you do that you'll get a false positive.
*Make sure you test from another host/system than the mail server itself!
telnet yourmailserverhost.com 25
220 Courier (FreeBS........
Basically you should always be 100% sure that whatever IPyour mail server sends out with has reverse DNS/PTR records. Remember that unless you own your IPs then you won't be able to set your own reverse DNS. Even if you were to create a reverse PTR record on your DNS servers it will be ignored. Reverse DNS is queried to pre-assigned DNS servers of your ISP, so therefore you'll need to contact your ISP/Colo/Hosting provider to do a reverse DNS entry.
If you don't have........
Many people aren't aware but recently Dual-Master Replication setups have become increasingly popular. That's because you get similar features and benefits of having a full-blown cluster (difficult to setup and maintain and requires I believe 3 servers just as controllers).
With a dual-master you just have a different off-set for the keys and you should be good, but of course there is the chance that at some point replication will halt because of an unexpected or unforseen error........
I think this will be useful to others because I have a server that kept crashing mysteriously during intense disk usage/RAID checks. It would only crash during the weekly RAID integrity check.
ThenI noticed during a reboot that not all CPUs were being brought up, as a result this actually creates much higher temperatures with the output I got from sensors, just booting the system produced higher than normal temperatures.
You can imagine that a full blown RAID check........
understanding /etc/aliases
*remember to apply changes you need to run "newaliases" after editing /etc/aliases
one thing I don't get is that it doesn't allow you to specify the whole e-mail address on the left-hand side
eg:
yourfullemail@domain.com: someotheremail@domain.com
postalias: warning: /etc/aliases, line 109: name must be local (if you try the above)
It works more like this:
your........
genuine.com/IN: loading master file genuine.com.zone: file not found
_default/genuine.com/IN: file not found
I always found it silly that no one really talks about this and apparently many like me and even control panels like Plesk were still using hard paths. I always thought "why can't I just specify the name of the zone file and have bind find it". Surely the default search path must be /var/named or somewhere else but there is no such thing.........
mysqldump does not include CREATE DATABASE statement
you need the --databases option
"--databases" is misleading, it implies in the documentation that this is a list of databases to be dumped, it should be clear that uses this command in conjuction with dumping a single database also adds CREATE DATABASE and is the only way to get the database to automatically create itself.........
PHP5 & Apache Blank Screen/Page
The PHP package is installed and works from the CLI
Error reporting is enabled
The only way I could get it working was:
rm /etc/php.ini
yum remove php
yum install php-* -x php-pear* -x php-pecl*
Interestingly enough reinstalling php did not bring back the deleted php.ini but everything is working.
........
Jan 16 04:02:03 centosbox syslogd 1.4.1: restart.
Jan 16 04:07:34 centosbox kernel: INFO: task updatedb:20771 blocked for more than 300 seconds.
Jan 16 04:07:34 centosbox kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 16 04:07:34 centosbox kernel: updatedb D F78BE050 6476 20771 20766&n........
CPU/Kernel/MB/RAID problem?
Jan 5 12:45:05 testbox kernel: [653298.890004] BUG: soft lockup - CPU#0 stuck for 61s! [hal-acl-tool:4168]
Jan 5 12:45:05 testbox kernel: [653298.890005] Modules linked in: vmnet vmci vmmon binfmt_misc drbd video output input_polldev ocfs2_stackglue ocfs2_dlmfs ocfs2_dlm ocfs2_nodemanager configfs k8temp hwmon_vid lp snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi........
Webmin/Virtualmin when enabling bind:
Failed to save enabled features : Virtualmin is configured to setup DNS zones, but this system is not setup to use itself as a DNS server. Either add 127.0.0.1 to the list of DNS servers, or turn off the BIND feature on the module config page.
It means what it says, add "127.0.0.1" to /etc/resolv.conf........
Importing Plesk 8.6 Backup to Virtualmin:
Validating migration file ..
.. validation failed : XML::Simple Perl module is not installed
Solution is to install the correct module:
perl -MCPAN -e 'install XML::Simple'
Migrating a single domain works just fine, but it doesn't work with a full client backup containing multiple domains.........
I found the cause of this issue was from all the diskspace being used but clearing it was not enough. Iguess the tables became inconsistent when space ran out and myisamchk is what fixed the rest.
service mysqld restart
ERROR! MySQL manager or server PID file could not be found!
....................................................................................... ERROR! Manager of pid-file quit without updating file.
se........
Webmin Setup Centos 5:
wget http://downloads.sourceforge.net/project/webadmin/webmin/1.530/webmin-1.530-1.noarch.rpm?r=http%3A%2F%2Fwww.webmin.com%2Fstandard.html&ts=1294339690&use_mirror=surfnet
[1] 24229
[2] 24230
[root@host ~]# --2011-01-06 21:48:20-- http://downloads.sourceforge.net/project/webadmin/webmin/1.530/webmin-1.530-1.noarch.rpm?r=http%3A%2F%2Fwww.webmin.com%2Fstandard.html
Resolving downloads.sourceforge.net... 216.34.181.........
Virtualmin Postfix Error:
The status of your system is being checked to ensure that all enabled features are available, that the mail server is properly configured, and that quotas are active ..
A problem was found with your Postfix virtual maps : No map sources were found in the Postfix configuration
.. your system is not ready for use by Virtualmin.
........
This made me nervous but it's clearly a cronjob based on the messages log that happens every Sunday at about 4:22.
I actually can't find any evidence of it in cron.d cron.daily but it is there somewhere obviously.
What I don't get is why doesn't this cronjob do a datacheck like Ubuntu's cronscript does? When you unnecessarily rebuild the array you lose your redundancy during that point which makes your data extremely vulnerable.
*Update I did a grep of &q........
The normal solution doesn't help or apply here:
ssh -v user@192.168.5.41
OpenSSH_4.3p2 Debian-9etch3, OpenSSL 0.9.8c 05 Sep 2006
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 192.168.5.41 [192.168.5.41] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/identity type -1
debug1: i........
You're not supposed to call ntpdate like that, it's part of the server and needs a bunch of different arguments.
The chances are if your time is out of sync and you installed ntpd, you need to start the ntpd service.........
That is pinging to the gateway IP on the same switch, the same IP is pingable externally without any problems which makes me think the switch is fine.
64 bytes from 55.55.55.55: icmp_seq=4 ttl=255 time=1.07 ms
64 bytes from 55.55.55.55: icmp_seq=1 ttl=255 time=3536 ms
64 bytes from 55.55.55.55: icmp_seq=2 ttl=255 time=2536 ms
64 bytes from 55.55.55.55: icmp_seq=3 ttl=255 time=1536 ms
64 bytes from 55.55.55.55: icmp_seq=8 ttl=255 time=1.20 ms
64 by........
I can't tell if it's Flash or Javascript that they were using, but it basically caused my sysetm to lockup until I closed that one page. Is this proof enough that Wal-mart is evil?:)
I've never seen that before, it's weird how certain things mask themselves as high CPU usage with Xorg, unless it is some kind of weird Xorg problem but I believe it's more of a Flash/Javascript issue from Firefox in Wal-mart's evil scripting.........
This doesn't seem to be widely known (maybe it's in some documentation that none of us read though)but there's an easy way to check the integrity of any mdadm array:
sudo echo check > /sys/block/md0/md/sync_action
-bash: /sys/block/md0/md/sync_action: Permission denied
sudo will never work, this only works as root since echo is not actually a binary/command. It is built-into bash.
/sys/devices/virtu........
Install the "Editors" and "Net" groups that will give you rsync, ssh, ssh-keygen and cron.
The trickiest thing that I keep forgetting about each time is you have to run "cron-config" which adds the cron service to Windows, and without doing that obviously no cron jobs will be run thus making automatic backups impossible.
Warning about rsync/cygwin and using the -a archive switch.
It's a good thing I caught this because it doesn't work ri........
This really made me nervous but notice the mdstat says "check". This is because in Ubuntu there is a scheduled mdadm cronscript that runs everyday on Sunday at 00:57 that checks your entire array. This is a good way because it prevents gradual but unnoticed data corruption which Inever thought of.
As long as the check completes properly you have peace of mind knowing that your data integretiy is assured and that your hard drives are functioning properly (I'........
[137392.910057] ata4.00: exception Emask 0x0 SAct 0x1 SErr 0x80000 action 0x6 frozen
[137392.910077] ata4: SError: { 10B8B }
[137392.910095] ata4.00: cmd 60/20:00:00:00:00/00:00:00:00:00/40 tag 0 ncq 16384 in
[137392.910099] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[137392.910122] ata4.00: status: { DRDY }
[137392.910135] ata4: hard resetting link
[137393.440060] ata4: SATA link........
There's no partial WD EARS alignment fix:
I had data on /dev/sda3 and /dev/sdb3 (RAID1) so I couldn't edit that one.
I thought I'd be smart and try fixing the first two partitions so I set the first one starting at sector 2048 and then +8 for the second partition.
This has really slowed the performance down worse than it ever was!
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, tot........
What this really refers to is gnome-volume-control-applet which is what controls the volume in the panel/indicator applet.
In Ubuntu 10.04 it is just the applet mentioned above, run that from the command line and it will start.
I lost mine when I removed pulseaudio trying to fix audio issues with Flash and Opera. It also removes the gnome-volume-control-applet from starting. *Ialso note........
One of the purposes of rsync is to backup whole filesystems and archive them but how can you do that properly and restore things to normal if all permissions and ownerships are not preserved from your root filesystem?
It's not desirable to have everything running as root, especially not just for an rsync.
The Easy rsync preserve permission solution for non-root users
sudo is the answer and all you have to do is edit /etc/sudoers
At the end o........
I've only used it on Centos, soI thought I'd make a quick Debian guide:
Install the DRBD Package
apt-get install drbd8-utils
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
libswfdec-0.8-0
Use 'apt-get autoremove' to remove them.
The following........
I'm mentioning this because I keep forgetting what port the management is on for the web interface (since newer releases of VMWare server took away the superior stand alone client).
So remember it is port 8333 and sometimes you need to restart vmware-mgmt service and also enable sslv2 in your Firefox or it won't connect.........
I wanted to Import/Use a .vmdk hard disk image file from VMWare. Generally you can just "point" VirtualBox to it and use it and it will work but I found an exception.
One of my Centos 4.4 x64 images wouldn't boot. I had two copies, an older one and the newer one. The older one booted as normal (once I changed the VirtualBox driver to IDE from SATA). The newer one stopped at the "GRUB loading" message no matter what I tried.
As far as........
The Xen VPSI had was not working properly and when they asked for the login information I found the support was coming directly from India:
whois 122.178.148.*
[Querying whois.apnic.net]
[whois.apnic.net]
% [whois.apnic.net node-5]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html
inetnum: 122.178.128.0 - 122.178.191.255
netname:&........
yum exits in the middle
The problem is this VPS seems to be an OpenVZ template from HyperVM. The only way to make it work was to disable i386 packages since this was an x64 kernel. That shouldn't be necessary but it was the only way to make yum stop quitting after the first package or two. I couldn't find any issue by checking the logs either.
echo y|yum install vim-minimal telnet expect jwhois net-tools slocate iptables elinks gawk
L........
first container would not come up:
Starting CT 2333:
service vz stop
OpenVZ is locked [FAILED]
2010-11-29T23:26:23-0800 vzctl : CT 2333 : Starting container ...
2010-11-29T23:37:21-08........
hdparm -B 255 /dev/sdb
/dev/sdb:
setting Advanced Power Management level to disabled
HDIO_DRIVE_CMD failed: Input/output error
The one thing you can do though is to set hdparm spindown time lower (it doesn't seem to work that well).
-S set standby (spindown) timeout
hdparm -S 251 /dev/sda
/dev/sda:
setti........
Refusing to automatically import keys when running unattended.
Use "-y" to override.
When using echo y|yum install gcc
Fix with rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY*........
I separated the 2 drives in the RAID 1 array.
1 is the old one /dev/sda and is out of date, while the separated other one /dev/sdc was in another drive and mounted and used with more data (updated).
I wonder how mdadm will handle this:
usb-storage: device scan complete
md: md127 stopped.
md: bind
md: md127: raid array is not clean -- starting background reconstruction
raid1: raid set md127 active with 1 out of 2 m........
Let the numbers speak for themselves, from what I read the Load_Cycle_Count which is very high (more than 500,000/half a million times) is the number of head parks. What a stupid"Green" design and design flaw which will probably mean an early life for the drive.
This is almost as silly as Seagate's new reputation for BSY/poor quality disks since the 7200.11 series.
To make it worse this is also when Western Digital introduced "Advanced Format" o........
Nov 29 20:17:58 ubuntu kernel: [ 1157.180789] md: md1 stopped.
Nov 29 20:17:58 ubuntu kernel: [ 1157.180829] md0: unknown partition table
filesystem not responding/reading properly with du or rsync (this needed an fsck).
[ 2571.489217] EXT3-fs error (device md2): ext3_lookup: deleted inode referenced: 35923106
[ 2571.942299] EXT3-fs error (device md2): ext3_lookup: deleted inode referenced: 35923110
[ 2571.9568........
Moving to RAID was a pain.
What you have to do is the following from an existing install:
Install mdadm
Create your mdadm RAID 1 array on your spare hard drive.
Start it with the missing disk.
rsync the entire contents of your current / to the md partition.
Here's a good way of doing it:
rsync -Pha --exclude=/proc/* --exclude=/sys/* --exclude=/mnt/* /. /mnt/md2........
This is a "pro" feature I guess so you don't have to see the ugly GRUB screen but if you're having boot problems or trying to update/customize your system it can be frustrating.You have to do some Googling to find out that you have to hold shift to see the GRUB2 menu.
You have to hold shift before GRUB2 loads and you will see it........
From a LiveCD or if you're doing something like converting your non-RAID install to mdadm here's how you would chroot properly (you have to mount your proc, sys and dev on the running system/LiveCD to your chroot environment if you want things to work right, especially if you need to run update-initramfs due to a driver change etc..)
*replace "path" with your mount/chroot path
mount -o bind /proc /mnt/path/proc
mount -o bind /dev/ mnt/pa........
I couldn't figure out whyI couldn't install a simple package. This is what's annoying about cutting edge Debian distros, yes we know you support each license on average for 1-2 years but why take down the supporting binary packages and basically disable the older versions?
sudo apt-get install update
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find p........
I couldn't figure out why this wouldn't work, a test script in the root of my htdocs folder worked fine.
Within some subdirectories the same code would produce different base64 results but I didn't know hwy.
Archive: /tmp/archive.zip
Zip file size: 6888 bytes, number of entries: 92
error [/tmp/archive.zip]: missing 242827681 bytes in zipfile
(attempting to process anyway)
error [/tmp/archive.zip]: attempt........
After an upgrade wine wouldn't open anything, not even the pre-installed notepad.
There are no wine logs and nothing is mentioned in any standard log file about why.
I finally decided to run wine from the shell and see what's going on:
wine client error:0: version mismatch 398/402.
Your wineserver binary was not upgraded correctly,
or you have an older one somewhere in your PATH.
Or maybe the wrong wineserver is still running?........
nautilus-gksu - privilege granting extension for nautilus using gksu
nautilus-sendto - integrates Evolution and Pidgin into the Nautilus file manager
nautilus-share - Nautilus extension to share folder using Samba
nautilus-actions - nautilus extension to configure programs to launch
nautilus-bzr - Bazaar (bzr) integration for nautilus
nautilus-cd-burner - CD Burning front-end for Nautilus
nautilus-clamscan - Antivirus scanning for Nautilus
n........
Just install the following package "nautilus-image-converter" and you will be able to right click any image and convert the size and rotate it.
My only wish is that you could also convert the image type from say tiff to jpg etc...
This is an awesome/handy/feature and great tool to have. This is one way where GNOME/Nautilus excel, the possibilities are endless to simplify and make simple/mundane tasks quicker and more efficient than ever.........
I thought it was a GNOME problem because no matter what styles I applied Nautilus wouldn't change, but it was only Nautilus that wouldn't change/update anymore so I should have known.
The only fix/solutionI knew of other than rebooting is the following:
sudo killall nautilus
I tried closing all instances of nautilus that were visible and it had no effect.
And another thing to remember is that only will appearances/styles/themes not apply to N........
Virtually no system has a floppy disk drive anymore but you will often find your Linux distribution insists that you do or should have one :)
The solution is to remove the floppy module and prevent it from loading on the next reboot.
rmmod floppy
Centos/RHEL
echo "blacklist floppy">> /etc/modprobe.d/blacklist
#update initramfs so it takes effect
dracut........
I spent so much time debugging this, most sites don't tell you a very important option to use with CURL and you will only find out this is the problem by running the PHP script from the command line you get the following output that shows the issue (I don't see any way to get this output from Apache itself).
* About to connect() to ip.ip.ip.ip port 25000
* Trying ip.ip.ip.ip... * connected
* Connected to ip.ip.ip.ip (ip.ip.ip.ip) port 25000
* succes........
Initializing quota ...
Error: Not enough parameters, diskinodes quota not set
vzctl set $veid --diskinodes 90000:91000 --save
New versions of OpenVZ seem to have some strange diskinodes parameter which is required.........
expect script debugging
Add the "-d" switch.
#!/usr/bin/expect
I have a problem writing something to a telnet session:
send: sending "statusn" to { exp6 }
send: sending "quitr" to { exp6 }
write() failed to write anything - will sleep(1) and retry...
The solution for my telnet script was to add the &q........
ping test.com
connect: No buffer space available
/var/log/messages
Oct 18 12:21:03 vps kernel: printk: 177 messages suppressed.
Oct 18 12:21:03 vps kernel: Neighbour table overflow.
Solution in /etc/sysctl.conf:
net.ipv4.neigh.default.gc_thresh1 = 4096
net.ipv4.neigh.default.gc_thresh2 = 8192
net.ipv4.neigh.default.gc_thresh3 = 8192
net.ipv4.neigh.default.base_reachab........
had trouble trying to revert Ubuntu 10.04 LTS from grub2, won't boot mdraid and did not even install mdadm during the installation!
I have tried moving back to GRUB 0.97
backed up original /boot and then copied /boot from an old Debian install. Modified device.map and menu.lst and put the appropriate kernels and initrd for Ubuntu back in /boot
I ran grub:
root (hd0,1)
grub> setup (hd0)
Checking if "/boot/grub/stage1........
cd /usr/local/directadmin/scripts/
scripts]# ./awstats.sh
--23:49:28-- http://files.directadmin.com/services/all/awstats/awstats-6.9.tar.gz
Resolving files.directadmin.com... 72.35.85.222
Connecting to files.directadmin.com|72.35.85.222|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1125906 (1.1M) [application/x-gzip]
Saving to: `/usr/local/directadmin/scripts/packages/awstats-6.9.tar.gz'
100%[=........
Remember to replace "eth0" with your NIC device although usually it will be eth0.
Replace 192.168.1.1 with your default gateway, remember you can also add multiple gateways by adding a second/different default gateway.
route
Kernel IP routing table
Destination Gateway Genmask&nb........
This has stumped me a few times because I keep forgetting that Centos 5.5 comes with a default iptables configuration that ends up blocking DRBD traffic,I tried all the normal things and couldn't understand why I couldn't make my normal DRBD config work. So if you have WFConnection problems and have tried the normal "mailing list" fixes, check your firewall status first!
Both Nodes Say the Following:
version: 8.3.8 (api:88/prot........
Always make a backup of the original file before trying this, I find this kind of thing when updating IPs etc.. to use a script.
Where the old IP is "192.168.5.8" and the new IP is "10.10.5.8"
sed -i s/192.168.5.8/10.10.5.8/g testdomain.org.db
The -i with sed means "inline" meaning we edit the file directly, but without the -i we could just use >and output the results to another file or do whatever else we wanted.........
Create New RAID 1 Array:
First setup your partitions (make sure they are exactly the same size)
In my example I have sda3 and sdb3 which are 500GB in size.
mdadm --create /dev/md2 --level=1 --raid-devices=2 /dev/sda3 /dev/sdb3
mdadm: array /dev/md2 started.
Check Status Of The Array
*Note I already have other arrays md0 and md1.
You can see below that md2 is syn........
My LOG is flooded with those messages many times per second.
I don't know what is wrong with heartbeat, but restarting the service fixed it.........
wget http://download.virtualbox.org/virtualbox/3.2.8/VirtualBox-3.2-3.2.8_64453_rhel5-1.i386.rpm
rpm -i http://download.virtualbox.org/virtualbox/3.2.8/VirtualBox-3.2-3.2.8_64453_rhel5-1.i386.rpm
error: Failed dependencies:
libGLU.so.1 is needed by VirtualBox-3.2-3.2.8_64453_rhel5-1.i386
libSDL-1.2.so.0 is needed by VirtualBox-3.2-3.2.8_64453_rhel5-1.i386
libXmu.so.6 is needed b........
Adding IP address(es): 192.168.5.8 192.168.5.9
Setting CPU units: 1000
Error: undump failed: Invalid argument
Restoring failed:
Error: iptables-restore exited with 2
Error: Most probably some iptables modules are not loaded
Error: rst_restore_net: -22
Container start failed
Stopping container ...
Container was stopped
Container is unmounted
Error: Failed to undump VE
Resuming...
vzquota : (erro........
In Ubuntu when quoting in a forum that would include a left < bracket it often appears garbled as a box with 003C inside.
Also with phpbb anything inside the "code" field appears garbled and as gibberish.
For some reason I can't find anyone else complaining about this and have not found a solution for it, but it's very annoying.........
error while loading shared libraries: libgd.so.2: cannot open shared object file: No such file or directory
Solution Install gd:
yum install gd
After that whatever you are compliing should be happy.........
You'll see the following and the boot process will freeze:
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
I have struggled with this issue on vari........
NET: Registered protocol family 2
The above is the last thing that I ever saw, I tried pci=routeirq etc.. and it wouldn't work.
The solution is to enable IOAPIC in the VBOX Settings
Just enable "IOAPIC" in the settings for your Centos Guest and you'll find the kernel boots just fine. I wonder if a physical system might stall in this same way if the BIOS has IOAPIC disabled which many people do as a troubleshooting method.
........
I am a huge fan of Linux and the idea of OpenSource but I've said it many times, there are still hurdles in today in 2010 for Linux as a Desktop. Linux is still intended for servers at its very core. This can be changed succesfully though, as Apple has shown us with Mac OS X based on FreeBSD.
Half of the issue is lack of driver support and the other half is the Linux Kernel and Window Manages, KDE and GNome still both don't cut it (but they're getting closer).
I'll........
Basically it seems that Thunderbird only remembers/savesfor the first/default identity account. It is very annoying when the signature gets placed at the bottom and another huge oversight on Mozilla's part.
Fortunately you can hack/manually set this setting.
The solution for fixing the Signature At the Bottom (Below The Quote)
Click Tools -> Options ->Advanced -> Config Editor
Then search for ".sig_bottom" and set them al........
vzmigrate --online dest-host VEIDNO
eg.:
vzmigrate --oneline 192.168.1.55 101
One option I would recommend is "--keep-dst", that way if the migration is interrupted you can still bring the VPS back up on the original host. After the migration is successful you can manually destroy it.
OpenVZ has a good writeup on this including Checkpointing and Restoring etc:........
For a standalone system the solution is simple, just use the same version of Windows a copy a good version of:
C:windowsSecurityDatabasesecedit.sdb from another computer.
Then you should be able to login again without getting the nasty message "Local policy does not permit you to log on interactively."
Of course you will probably need a way of accessing the filesystem off-line in order to get to it such as a Linux boot disc.
Some........
This was done on Centos butI think it's easier on Debian machines, the paths that it is set to use are tailored towards Debian, so there is some fiddling that needs to be done on Centos.
This is for chrooting ssh, but jailkit has other uses than just SSH jails but I won't cover them in this writeup.
1. Install jailkit
yum install jailkit
2. Setup Jail Home
mkdir /home/jail
chown root:root /home/ja........
This server was experiencing loads of up to 80 and maxing out the RAM and kmemsize on a CPanel VPS. There were literally dozens if not hundreds of exim processes. I have no idea why exim has such a design that would allow it to consume this much CPU and RAM. Any normal MTA should not be spawning so many processes, it should be processing them in sequence and if it is going to spawn hundreds of processes in response to a large volume of mail, it's better to have a delayed del........
After installation Directadmin does not work on OpenVZ VPS when browsing http://ip.ip.ip.ip:2222
service directadmin status
directadmin dead but pid file exists
tail /var/log/directadmin/error.log
Check the value of your ethernet_dev=eth0 setting in your /usr/local/directadmin/conf/directadmin.conf file and the output of /sbin/ifconfig
2010:07:10-12:44:01: ioctl can't find........
md: Autodetecting RAID arrays.
md: autorun ...
md: considering sdb1 ...
md: adding sdb1 ...
md: adding sda1 ...
md: created md0
md: bind
md: bind
md: running:
md: kicking non-fresh sda1 from array!
md: unbind
md: export_rdev(sda1)
raid1: raid set md0 active with 1 out of 2 mirrors
The md0 raid kicked sda1 ou........
Mencoder is great, you can throw anything at it, including video files from your camera and have it encode into xvid or almost any other format.
In my case I took 640x480 video from my Canon and reduced the size by 1/3 with the options below (there are many other options that you can read about in the manual but I like to keep it simple).
Mencoder Encode
mencoder -ovc xvid -oac mp3lame -xvidencopts fixed_quant=4 -o ........
If you have the "(auto-read-only)" beside an arrayI have no idea why that happens but it is easy to fix.
Just run "mdadm --readwrite /dev/md1" (rename md0 to the device with the problem and it will begin to resync.
md1 : active (auto-read-only) raid1 sdb2[0] sda2[1]
19534976 blocks [2/2] [UU]
resync=PENDING
........
I finally decided to look into some utils that did this, and the first one I found is "mp3burn". It is unbelievable simple and perfect. *2017-11 update and mp3burn is still available in standard repos such as Ubuntu 14/16 so this is a current and working project.
Just install the package and it gets all required libraries to convert and then burn's on the fly. And you won't believe how simple it is.
I just want to a directory that had the MP3's I wanted t........
This is a great way to use your ftp server space, for example on your web hosting account (althoughI believe many hosts don't allow storage like this), but if you have a VPS/Dedicated Server etc.., this would be perfect. Imagine how easy it is to work with an ftp account that you can just mount as a normal partition or directory in Linux, it would be great for backups etc..
Name
curlftpfs - mount a ftp host as a local directory
Synopsis........
My XBOX's dashboard/firmware was from sometime in 2008 when I first bought the system. I mainly played using composite cables but at my brother in law's house we used HDMI. The very first time it worked, but then I bought some games that did some update and after that HDMI never worked.
The symptoms besides having on sound is that your XBOX will show PC monitor resolutions but won't have any option to say you have a 720P or 1080P display, this means the XBOX firmware is fa........
I've never understood how to enable and disable services for different run levels in Debian based distros, it's just weird, annoying and doesn't make sense. I much prefer chkconfig from RHEL.
Just install the package called 'rcconf' and be done with it. rcconf makes things easy for you.
apt-get install rcconf
Reading package lists... Done
Building dependency tree
Reading state information... Done........
I'm using Ubuntu 8.04 but anyone using older kernels will find this may apply to them. My Intel graphics are very slow with the default Xorg settings but by using "EXA" acceleration, scrolling down windows of text becomes pretty snappy.
Just edit /etc/X11/xorg.conf
Section "Device"
Identifier "Configured Video Device"
&nb........
I was creating a RAID array and got this error: mdadm: /dev/sda1 is too small: 0K
mdadm: create aborted
Of course sda1 is not too small, both partitions sda1 and sdb1 are identical in size:
Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Sta........
Why would you want to downgrade the superblock? Old mdadm verisons like mdadm 2.5.6 only use the 0.90 superblock/metadata and new versions use 1,1.0,1.1 and 1.2 superblocks by default.
There are some annoying caveats with this, first of all the new superblocks (later than 0.90) CANNOT be read by GRUB, so you won't even be able to install GRUB. Even worse, old versions of mdadm CANNOT automatically detect arrays even if they were created with a new version of mdadm with th........
Warning: get_browser(): browscap ini directive not set.
Solution is to edit /etc/php.ini
Uncomment this:
[browscap]
browscap = extra/browscap.ini........
skipping non-regular file "mnt/lib/udev/devices/console"
skipping non-regular file "mnt/lib/udev/devices/kmem"
skipping non-regular file "mnt/lib/udev/devices/loop0"
skipping non-regular file "mnt/lib/udev/devices/null"
skipping non-regular file "mnt/lib/udev/devices/ppp"
skipping non-regular file "mnt/lib/udev/devices/net/tu
Solution for skipping non-regular file
You need the -D........
I have an md0 arary that my Centos install refers to. I feel this is half the reason why it won't boot anymore.
I saw the initrd for Centos was assembling it as md127 even though it was known as md0.
The reason for this is because I used mdadm --assemble --scan to detect the array on a LiveCD. I had no idea this name would stick (but now I realize the name is permanently stored in the metadata once you mount md127 or whatever random name assemble gives it). W........
Partclone is a great tool that is basically like dd only it does not waste space, it doesn't take the whole partition, yet it does the same thing as dd, only with huge space/cost savings.
Clonezilla uses partclone and is more of an integrated/easy to use suite I guess you could say. I've personally only used partclone but I wish there was an easy way to mount partclone images.
I believe with Clonezilla you can do that, so I will probably give it a shot next time.........
I successfully created a single RAID 1 partition which includes /boot inside it and my root directory through the Debian installer. It said GRUB installed successfully but when I try booting the OS it seems GRUB can't read anything.
When trying to boot from GRUB
GRUB Loading stage 1.5.
GRUB loading, please wait...
Error 2
I get "Error 2" when trying to boot Debian. I also notice from a LiveCD that........
I installed 5.5 with a 300GB RAID 1 partition (boot is also on this partition). It booted up fine the first few times until after I used a Live CD and accessed the array, and it became named /dev/md127 for some reason.
Now whenI boot into CentOS I get a kernel panic and different errors, once I got "invalid superblock", even though the array is fine (it didn't happen again, probably because I was sure to dismount and stop the mdadm array properly).
Here's what........
Do you have an LGA1156 board and wonder why your onboard video isn't working? It's probably because there is no GPU integrated on the board itself, it is supposed to be on the CPU and new CPU's from Intel don't come with it!
I was shocked to learn that you can buy a motherboard with onboard video which doesn't work. Inever knew it was being done or possible, but to make it worse the latest Core i5's don't have video on the die of the CPU.
This means having on........
I'm not impressed with this motherboard, I was impressed with my Gigabyte AM3 board which seems to work flawlessly.
Everyone knows that the firmware is flawed, even though I have the F6, it still seems that the system doesn't reset properly or quickly enough.
Another HUGE problem is that in most Linux kernels the NIC won't work (if you try 10 times by rebooting it might). I also notice that you need to power down for it to work.
This board does not seem very com........
It always worked fine before but no amount of power unplugging/cycling does any good. I can access one network share and that is one that I've already saved, but it can't see any workgroups.
One silly thing is why is there no option to manually connect to a netbios name or IP?
It seems there is a bug with the firmware and that the SMB client is not working properly. Hopefully it fixes itself at some point.
Between this and the lack of support for embedded s........
This was unbelievable how much the Xen kernel slows things down, keep in mind both tests were done on the hostnode, one was with the Openvz-Xen hybrid kernel and the other was just OpenVZ. You can see the performance difference is nearly 300% better when not using the Xen kernel.
OpenVZ-Xen Kernel Test Results (I was wondering what was wrong/so slow with my Core i5!)
# # # # # #&n........
The easiest way is if you have a secure way to connect and verify the hostkey of the remote host by using this guide.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOME........
This can be very annoying and CPanel doesn't seem to document it, or it's not found or made as obvious as it should be. It's always funny when I find it more difficult to work with a control panel than to do everytihng manually without CPanel or even Plesk.
So once again, the default serve path for contents is: /usr/local/apache/htdocs and this is especially applicable when accessing Apache by just an IP which is unbound to any domain at this point.........
cat /proc/user_beancounters produces the following:
kmemsize 1861537 5139870 12752512 12752512 26965041
Notice the failcnt "26965041", that is for kmemsize and at first it confused me. The system had enough guaranteed and enough burst RAM available. kmemsize is a variable indepedent of that, but who cars about the explanation right, let's just make thing........
Ihave no idea how to get the loopback device working in OpenVZ, but what's more frustrating is that I purchased a CPanel license for my VPS and clearly it is not "VPS Optimized". Although everything does seem to work at this point despite that error.
The suggestions here: http://forum.openvz.org/index.php?t=msg&goto=1339 don't seem to work at all. This is an OpenVZ issue, but also a CPanel isue, why on earth would loopback support be expected in a VPS a........
Starting online migration of CT 300 to 192.168.5.45
Error: vzcpt module is not loaded on the source node
Error: Can't continue online migration
Error: vzcpt module is not loaded on the source node
Error: Can't continue online migration
This is a very easy fix, you just load the appropriate modules on the source and target node (althoughI don't know why the vzmigrate tool can't do that for the user on both ends):........
I took an educated guess because it kept happening at the same spot when loading the XP install. I thought it was the hard drive or motherboard.
But it turns out my heavily used but loved NEC 3500 DVD-RW drive was the culprit. After disconnecting it and swapping it for another much beloved Pioneer DVD-RW, everything has gone smoothly.
I never ran into this or many issues because I've hardly used this drive since moving it to another Desktop years ago. I actua........
This is a very simple solution, but most guides out there make you login twice (once to scp the key) and once to put the key in authorized_keys. There's no need for that.
If you don't already have a ~/.ssh/id_rsa.pub just type "ssh-keygen -t rsa" and keep hitting enter until it's done :)
Just use this code to easily enable passwordless login with SSHD
key=`cat ~/.ssh/id_rsa.pub`;ssh user@192.168.5.25 "echo $key >> ~/.ssh/auth........
I'm not a fan of Asus and won't be buying another because of having to fight Asus over a bogus warranty denial (it's a long story but they only replied about how to RMA my unit weeks later on the EXACT day the warranty expired).
Anyway, it's just a matter of hitting F9 to do this, there's no need to worry about booting from USB or CD (unless of course you want a different OS eg. Windows XP Pro, Vista/7, or a flavor of Linux or Unix). Also remember that you need to fully/properl........
CC drivers/message/fusion/mptsas.o
drivers/message/fusion/mptsas.c: In function `mptsas_port_delete':
drivers/message/fusion/mptsas.c:106: sorry, unimplemented: inlining failed in call to 'mptsas_set_rphy': function body not available
drivers/message/fusion/mptsas.c:462: sorry, unimplemented: called from here
make[3]: *** [drivers/message/fusion/mptsas.o] Error 1
make[2]: *** [drivers/message/fusion] Error 2
mak........
I'm guessing RAM manufacturers forgot they're not the oil/gas companies and are playing games. It was just a year ago when I was buying 2GB sticks as low as $20 CAD! Now the average price is $50 CAD.
What happened to Moore's law when it comes to pricing for RAM? Every other piece of hardware generally has been coming down without exception.
........
This is what the /var/log/cups/error.log says after my Samsung CLP-310N decided to stop printing. This is a new printer that replaced my CLP-300 and it has been working for a day so far.
What happened is that I lifted the top part (not realizing there were rollers on it) and it stopped printing. The network activity light was flashing ,hitting the stop button didn't do anything. Even powering the printer on and off did not help.
I have restarted CUPS and SMB on the........
Not sure what rsync switches/options to use?
rsync -PDrphogtl
The short version would be:
rsync -Pha
I think these are really common sense options to use and probaby should be the default.
Explanation of rsync switches
P = display the progress
D = hybrid of --specials and --devices so all special and device files will be copied as well.
r = recursive (otherwise rsync won't copy files deeper than........
ERROR: sdb2/backup.r18 failed verification -- update retained.
This happened when Iwas rsyncing a dying hard drive, a lot of people seem to report this as an error with rsync itself but I don't think rsync is the issue at all.
I know the source hard drive was bad, it was having all kinds of timeout, seek, hardware ECC recovered and reset errors.
The only time something else could be the problem is if the data is being corrupted in transit, perhaps through........
This drive is clearly on the way out, the Kernel knows it but I'm surprised that SMART is not concerned. I didn't blame Seagate for their past issues until now. This hard drive has hardly been used and has not even been powered on for a year according to SMART.
Home page is http://smartmontools.sourceforge.net/
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda 7200.11
Device........
It is desirable to strip the leading slashes when taring / because you wouldn't want to overwrite your entire system when extracting some files to check.
But if you are restoring / from the tar you want the leading slashes added again. Here's how to do it:
--absolute-names
-P
Either one above will do the same thing.........
I thought there would be an error message or warning from MySQL in the case that the text you submit is greater than the allowed limit based on the field.
So essentially I submitted text that was about 120,000 characters long, whereas the limit of TEXT is just 65,535 characters! I almost lost half of my data/what I typed without knowing it!
I just altered the field type in my database from TEXT to LONGTEXT. I can't see how LONGTEXT wouldn't be long enough for MOST........
Seagate Inventory/Firmware Check
I heard about this issue a long time ago but never looked into it. I figured I wasn't affected since my 500GB drives were running for so long. I've been using Seagate's since 2002 and to this day all of the drives I have are alive from Seagate.
*Update the bad news is that I realize one of my 500GB's is about to die, it's not even a year old, but is also not affected by the recall according to Seagate!
Seagate Inventory/Firm........
From the package "parted" you can use the command "partprobe" to re-read the partition table. I really hate rebooting, and that's what Iloved to hear about AHCI motherboards, that they allow hotswap so you don't have to reboot. But that's only as good as the OS, if the OS does not reload the partition table you won't be able to do anything with that new drive you attached without rebooting. Yes, even without re-reading the partiton table Linux will........
Before we start I take no responsibility for this, you should have a backup and if you make a mistake during this process you could wipe out all of your data. So backup somewhere else before starting this as a precaution, or make sure it's data you could afford to lose.
The RAID 1 Setup (Hardware Wise)
I've already setup my 2 x 1TB (Seagate) drives with identical partitions, make sure your new hard drive (the empty one) is setup like your curr........
I have no idea why but mkfs.ext3 defaults to a patheticlly small blocksize of 1024 bytes/1KB (kilobyte). That means the maximum filesize is ONLY 16GB! With 2KB/2048 bytes you get a 256 GB maximum filesize, and with 4KB/4096 bytes you get 2TB!
I finally noticed/paid attention to this after realizing that with rsync and scp that no file larger than 17GB could be transferred. I then realized it must be a file size limit on the partition.
Here is what tune2fs tol........
I'm really starting to love ImageMagick, I've used it to mass convert/resize family photos with scripts and all kinds of handy things.
Today I just learned that you can create PDF files with it too, say if you have images scanned or anything else it's very simple:
convert *.jpeg output.pdf
You can replace jpg with whatever format your files are in. One thing to remember is that you can specify the order that the images/pages are added to the PDF manu........
It's basically free bash shell script available from: http://wpkg.org/email2fax/index.php/Main_Page
Make sure you have the required tools:
libtiff
ghostscript
mpack/munpack
Where you can e-mail your Asterisk box and it will fax it to the phone number in the subject line. The good news ends there, it is fairly undocumented and buggy.
Take for example how the documentation mentions you can invoke from the com........
The folder I was trying to archive is about 72GB, but much like rsync at about 17GB it chokes because of the filesize. What's with so many common and essential Linux tools having such limitations? I guess it is likely that the authors never wrote their code with the idea that files would be so large but it's still very annoying. It's important to stay on top of these limitations on production servers because I didn't realize what happened until I checked the file with "........
The last transfer I was able to do was 16.77GB according to rsync's output and it worked fine.
16.77G 100% 10.66MB/s 0:25:00 (xfer#17484, to-check=234753/256249)
But on a file over 17GB (gigs) it stalls. Trust me, it really is stalled, it's been about 8 hours with no progression from that point for some reason.
17.24G 54% 10.65MB/s 0:22:07........
In Debian based distros:
apt-get install jabber
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
fakeroot dkms
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
jabber-common
The following NEW packag........
I decided on using yum to help me decide even though I normaly use proftpd I decided to see what else I could find.
yum search ftp
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* rpmforge: ftp-stud.fht-esslingen.de
* base: mirrors.netdna.com
* updates: updates.interworx.info
* addons: yum.singlehop.com
* extras: mirrors.netdna.com
rpmforge........
Proxmox has made this free utility to backup running OpenVZ containers. It's a great program which is actually just a PERL script but gets the job done. This program is not 100% required because all it really does is cp -a from your container's path as far as I know but it is still good to have uniformity to how you backup your containers.
For RPM distros such as Centos/RHEL/Fedora etc.. download and install this:
wget http://www.proxmox.com/cms_proxm........
./ntfs-3g /dev/sda1 /mnt -o force
Unexpected sectors per cluster value (127).
Failed to mount '/dev/sda1': Invalid argument
The device '/dev/sda1' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
This is happening on a system I've come across an HP 6930P running Windows XP Professional. The partition appears to be very norm........
All you have to do is browse to:
C:Documents & SettingsYourUserName and you'll see the following:
Inside "My Recent Documents" are of course shortcuts to the most recent documents you opened
Inside "SendTo" is your sendto, you could edit that to Send a file to a network destination, your Flash Drive........
Here are the results, it is Sempron 3000+ AMD Mobile, 500Gig HDD, 512MB RAM with shared ATI Radeon graphics.
# # # # # # # ##### ###### # # #### # #
# # ## # # # #&nb........
heartbeat is stopped for some reason
Anyway hnode2 was active and the services are running fine but I see heartbeat has been stopped somehow.
Here is the last log I see of heartbeat:
[quote:23c84415f5]
Sep 9 17:15:32 hnode2 heartbeat: [16738]: info: MSG stats: 9/1762471 ms age 0 [pid16738/MST_CONTROL]
Sep 9 17:15:32 hnode2 heartbeat: [16738]: info: cl_malloc stats: 716/51784021 152624/74519 [pid16738/MST_CONTROL]
Sep 9 17:15:32........
PHP cannot access /usr/bin/opensslI have verified the username that runs the process is able to access /usr/bin/openssl and it does exist but the PHP script is saying it doesn't exist:
[code:1:1fd0f3abbe]
if (!file_exists($OPENSSL)) {
//echo "ERROR: OPENSSL $OPENSSL not foundn";
}[/code:1:1fd0f3abbe]
I don't get itI can clearly see the contents of /usr/bin by using the PHP system fu........
Javascript Get a specified element using getElementById()Great, it produces the value for whatever "id" is passed to the function.
http://www.java2s.com/Code/JavaScript/Development/GetaspecifiedelementusinggetElementById.htm
[code:1:1287ede953]
function getElement(){
var x=document.getElementById("myHead........
JavasScript how to set or write value in id tagbla
I need to set a value inside that DIV tag using Javascript, how would I do it?Doesn't work for me:
[quote:c6b5f693a5]Warning: Element referenced by ID/NAME in the global scope. Use W3C standard document.getElementById() instead.
Source File: http://hosting.com/vps-order.html
Line: 19[/quote:c6b5f693a5]
[code:1:c6b5f693a5]........
Clone any OS partition perfectlyIn one box I needed to copy the boot partition to another disk while retaining the MBR and other data.
I simply ran this command:
[code:1:1b1ff110ca]dd if=/dev/hda1 of=/dev/hdb1[/code:1:1b1ff110ca]
[b:1b1ff110ca]if[/b:1b1ff110ca] = source patition
[b:1b1ff110ca]of[/b:1b1ff110ca] = destination partition
Here's an interesting article on it
http://www.rajeevnet.com/hacks_hints/os_cl........
SSH automatic login without passwordlocal> ssh-keygen -t rsa -f .ssh/id_rsa
-t is the encryption type
-f tells where to store the public/private key pairs. In this case, the .ssh directory on home is being used
A password will be asked; leave this part blank, just pressing
Now, go the .ssh directory, and you will find two new files: id_dsa and id_dsa.pub. The last one is the public part. Now, copy the public key to the serv........
Mount Linux ext2 file systemNormally in Linux you could mount ext2 or ext3 etc... like this:
mount -t ext2 /dev/hda1 /mnt/hda1/
In FreeBSD the difference is of course the disk naming conventions (hda1 would be known a /dev/ad0s1):
To mount ext2 in FreeBSD just type:
mount -t ext2[b:68c16c60bf]fs[/b:68c16c60bf] /dev/ad0s1 /mnt/ad0s1........
Asterisk FreeBSD compile problemsI couldn't get it to compile without using the following options at compile time:
[b:b7d672ee28]
make install WITHOUT_ZAPTEL=YES WITHOUT_MYSQL=YES WITHOUT_FAX=YES WITHOUT_ODBC=YES WITHOUT_H323=YES[/b:b7d672ee28]Some problems you might have with copying over your Linux config files to FreeBSD is different paths.
[b:f044931f41]For example the etc path for Asterisk on BSD will now be:[/b:f044931f41]
[qu........
Problems surfing web/servingI noticed sometimes websites wouldn't load at random through a FreeBSD box and other systems on the same link didn't have the issue. I believe it is because of the low default limit of 128 TCP connections that caused the problem. It would also slow down any traffic that requires many connections such as Bittorrent.
The fix is to increase the amount of connections to at least 1024
Edit [b:520b050d3e]/etc/sysctl.conf[/b:520b05........
CREATE Database/Granting PrivilegesCREATE your first database
Code:
[code:1:0668cd8e74]CREATE database myfirstdb;
[/code:1:0668cd8e74]
CREATE a user for your first database
This one creates the user 'sqladmin' and gives them 'usage' on your new database 'myfirstdb'
Code:
[code:1:0668cd8e74]mysql> GRANT usage on myfirstdb.* to sqladmin@localhost;
Query OK, 0 rows affected (0.00 sec)[/code:1:0668........
Nice General Linux RAID 1 GuideFull examples/tutorials that should work for any Linux system using GRUB or LILO as the boot loader.
This is the only tutorial I've seen that clearly shows how you can convert an existing non-RAID system to software RAID1 remotely, without ever having to be at the computer. This is important for people who co-locate or rent dedicated servers that they may not have physical access to in a timely manner.
https://alioth.debia........
Heredoc warningsExample
$somevariable = ........
Centos 4.3 x64 & VMWare Server Beta[code:1:6d0b2c8c2f]
The correct version of one or more libraries needed to run VMware Server may be
missing. This is the output of ldd /usr/bin/vmware:
linux-gate.so.1 => (0xffffe000)
libm.so.6 => /lib/tls/libm.so.6 (0xf7fbd000)
libdl.so.2 => /lib/libdl.so.2 (0xf7fb9000)
libpthread.so.0 => /lib/tls/libpthread.so.0 (0xf7fa7000)
libX11.so.6 => not f........
Upgrade Release Kernel TipsThis is for CentOS 3.1 to 3.8 but the methodology will apply everywhere.
I ran into a problem first of all with a non-booting system after running
#yum update centos-release
It took me to 3.8 and upgraded all the other packages [b:7e931c835d]BUT[/b:7e931c835d]
because of some stupid flags enabled in /etc/yum.conf the KERNEL WASN'T UPGRADED SO AFTER BOOTING, WELL IT DIDN'T BOOT OF COURSE :)
H........
Setup Static IP Address ONBOOTAssuming you are using eth0
Note this will work for any version of CentOS and basically any version of Redhat Linux or Redhat based distribution.
You would need to create a new file
[code:1:02f8d34c30] /etc/sysconfig/network-scripts/ifcfg-eth0:0[/code:1:02f8d34c30]
DEVICE=eth0:0
the ":0" at the end specifies alias 0 we could actually change this to ":99" or "........
Updated to Version 3.8 and can't loginSSHD accepts my password but then hangs at "Last login: Wed Sep 13 21:30:02 2006 from"
This occurred during a yum update after upgrading my release, installing the new kernel and rebooting.
I got kicked out of sshd after seeing the following during yum update:
telnet 100 % done 85/476
tux 100 % done 86/476
ntsysv 100 % done 87/476
rpmdb-redhat 94 % done 88/476........
Telus + 2Wire 2700 Router HorribleWell first of all let me say this is the only router/switch that sometimes seems to crash/disconnect computers on the local network.
This device also thought it would be smart to block VOIP packets coming from my Sipura ATA VOIP adapters so I disabled the [quote:cb89ba7bff]"Invalid TCP Flag Attacks (NULL/XMAS/Other)"[/quote:cb89ba7bff] option
Then all of a sudden I couldn't get onto any web pages, the wireless........
Need identd for port 113 ? Install authdyum install authd
Happy identing :)Actually it's not that simple.
It installs as an "xinetd" service and is disabled and turned off by deafult.
To enable it run:
[code:1:8c94df8319]
chkconfig --level 3 auth on
service xinetd restart
[/code:1:8c94df8319]
This will set identd aka authd to start by default.
service xinetd resta........
/usr/bin/ld: cannot open crt1.o: No such file or directory[quote:812bec9db7]/usr/bin/ld: cannot open crt1.o: No such file or directory
collect2: ld returned 1 exit status[/quote:812bec9db7]
This is annoying and in my case it happened on Centos AMD 64 when compiling a 32bit program with GCC.
Install glibc-devel.i386 (make sure you get the i386 version and not the native 64 bit version which is likely already installed).
The joys of 3........
Roxio Easy Media Creator "Could not complete last comma[b:2e4e25672a]"Could not complete the last command because: Unknown error"[/b:2e4e25672a]
When I try to burn an .iso image by double clicking it and allowing Roxio to open up "Disc Copier" I get a bunch of those messages.
It's annoying and not really awe inspiring!........
Updating yum repos for DAG /etc/yum.repos.dIn /etc/yum.repos.d
[quote:96456b2ab9]Create any file such as "CentOS-Dag.repo" in /etc/yum.repos.d[/quote:96456b2ab9]
Add the following to the above file:
[code:1:96456b2ab9]
[dag]
name=Dag RPM Repository For Red Hat Enterprise Linux
baseurl=http://dag.atrpms.net/redhat/el$releasever/en/$basearch/dag/
http://dag.freshrpms.net/redhat/e........
How to compile in Windows/DOSMingW is a free compiler project so start here:
http://www.mingw.org/download.shtml#hdr2
I downloaded the core GCC compiler:
http://prdownloads.sf.net/mingw/gcc-core-3.4.2-20040916-1.tar.gz?download
But it's missing even the standard C runtime libraries like "stdio.h"!
You may also need to add environment variables from the DOS command line.
Here is a simpl........
E-mail (Thunderbird) with GnuPG encryptionThis is great tool for Mozilla Thunderbird which allows you to encrypt your e-mails so only you and the receiver can view it even if the e-mail is intercepting or obtained by another person.
The only small catch is that you of course have to install an extension to Thunderbird and then configure each account you want to use it with. Really it can probably all be done in a few minutes and the effort is worth it.........
DVD Burners and Media at an all time lowThis is crazy you can buy a nice Pioneer DVD burner for like $64 CAD now and good media like 50PC Maxell is just $25.97 at Walmart.
I'm liking this. Time to make double archives of important data :)........
Quick Tutorial On Starting A Web Site[b:3cef3c01b6]Step 1.[/b:3cef3c01b6] Purchase a Domain Name (eg. yoursite.com)
[b:3cef3c01b6]Step 2.[/b:3cef3c01b6] Design your site using a program such as Microsoft Frontpage or Macromedia Dreamweaver. If you are unable or unfamiliar with doing this you may want to hire a company to create your site (many of them will handle each aspect of setting up your site).
[b:3cef3c01b6]Step 3.[/b:3cef3c01b6] Host your site........
E-Mail TipI just thought I'd give you guys a good tip about e-mail. It seems a lot of people like to use a Hotmail or ISP (eg. Telus) account for their e-mail but the problem is what happens if you switch ISPs, then your e-mail address no longer works and old friends might not be able to contact you. The same thing has happened for excite.com e-mail addresses where they just shut down.
Whether you are a business owner or personal user can you afford to lose an e-mail........
Vonage & Linksys Offer Trade-In ProgramVonage & Linksys Offer Trade-In Program
Monday, June 13 @ 09:22:36 PDT
Vonage is offering customers a way to get a free 802.11g router when they turn in their old one.
advertising
For a limited time, customers can trade-in their used router – any brand, any model – for a Linksys Wireless-G Router with 2 Phone Jacks for broadband telephony (WRTP54G) for free (after rebates), when they si........
The New Chips on the BlockThe New Chips on the Block
By Bruce Gain
Story location: http://www.wired.com/news/infostructure/0,1377,67795,00.html
02:00 AM Jun. 13, 2005 PT
We have embarked upon a new era in x86 PC computing -- so say chip giants AMD and Intel following their launches of dual-core PC processors. So how will dual-core processing change your PC computing experience? Our FAQ should help you decide whether or when you sho........
Intel's Finnish FetishIntel's Finnish Fetish
By Dave Mock
June 13, 2005
Chipmaker Intel (NASDAQ: INTC) has successfully topped the personal computer market for decades. Breaking into related areas such as communications has been much difficult for the world's largest semiconductor maker. But a new partnership with Nokia (NYSE: NOK) could help to change that.
Intel's forays into cellular-phone and home-entertaiment-device chips have........
Intruder detection device uses behavioural analysisIntruder detection device uses behavioural analysis
by Antony Savvas
Monday 13 June 2005
Symantec is introducing a new intrusion detection product that uses behavioural analysis to block potential attacks on enterprise networks.
The new Critical System Protection 4.5 system uses technology that Symantec acquired through last year’s purchase of Platform Logic. It is designed to protect deskt........
Become your own ISP!http://waverider.com/
I would link to the exact product I am mentioning but it's under Products/5.8Ghz because I can't find the exact URL because of their annoying javascript and frames (you'll see what I mean).
The exciting thing is that this unit can supposedly be up to 72mbit, it is NOT line of sight and the range is up to 20miles. I wonder how real world speeds and range would actually be and if it is reliable.
I j........
Starting/Creating Serviceshttp://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-starting-services.html
That might help........
Asterisk Agent Login ProblemUsing the AgentCallbackLogin function I couldn't login
I knew I had my agents setup properly in agents.conf so why couldn't I login?
The reason is because agents.conf was missing the [b:994d7a34af][agents][/b:994d7a34af] context!
I just added [agents] above the existing agent declarations and then I was able to login as expected.
It took a lot of figuring out and reading though!........
Just curious.....does China have web hosting?anyone know?I found these:
http://www.inscyber.net/
http://www.edong.com
http://www.net.cn........
MySQL Server 3.23 won't start after switching from 4.1I was using a 4.1 alpha version of mysql-server and some how version 3.23 of the client and 4.1 of the client were also both installed!
So I forced uninstalled everything because after trying and trying even though MySQL server was using the short 16byte password authentication I got some other errors.
After trying with the ports and having it fail because I had existing database data I force installe........
Trouble connecting between Windows XP and Windows 98 SharesOk a few things to check for:
* Disable all firewalls
* Make sure NetBEUI is enabled on both computers
* Make sure the Windows XP computer has the name of the computer logged in user of Windows 98 added as an XP user
* Add the XP user to anything you want to share
That fixed my problem........
FreeBSD Desktop OSsI would probably choose these over Linux.
In many ways these are probably more stable and just as easy to use as any Linux distros but the benefit of stable, updated and secure packages!
PC-BSD - http://www.pcbsd.org
DesktopBSD - http://www.desktopbsd.net/index.php?id=37
Personally PC-BSD is Beta at this point and is not easy if you are installing it on a non-primary partition.
I have not used Deskt........
Changing field names[quote:91ea6831b6]ALTER TABLE [u:91ea6831b6]table_name[/u:91ea6831b6] CHANGE [i:91ea6831b6]existing_field_name[/i:91ea6831b6] [b:91ea6831b6]new_field_name[/b:91ea6831b6] INT(11);[/quote:91ea6831b6]........
MySQL Reserved Wordshttp://dev.mysql.com/doc/mysql/en/reserved-words.html
You should familiarize yourself with these because you will have unexpected results if you use any of them.
Eg. try creating a table with what you think is valid syntax like this:
CREATE Table Order(
.......);
The word 'Order' is a reserved word and used to ORDER the results so you will get a syntax error from this one and you would think everything is........
Mounting NTFS in UnixJust a quick tutorial to mount your NTFS volumes in Unix (FreeBSD/Linux)
[quote:4a9de7bf80]mount -t ntfs -o umask=0 /dev/your_partition /mnt/your_mount_point[/quote:4a9de7bf80]
[b:4a9de7bf80]-o umask=0[/b:4a9de7bf80] is to ensure all users can access the mounted partition (otherwise don't use it and only root can access the mounted partition)
[b:4a9de7bf80]-t ntfs[/b:4a9de7bf80] is simple because it just lets mount kno........
MySQL SubQueryI was trying to do a sub-query here but it wouldn't work (Syntax Error) in MySQL for some reason even though based on the SQL standards it should be ok.
[i:1268bfa39e][b:1268bfa39e]I found the reason this doesn't work. I am using MySQL 3.23 and I read on the MySQL web site that versions before 4.1 DO NOT SUPPORT SUB-QUERIES so it showed me how to rewrite the following as a LEFT join instead of a sub-query.
[/b:1268bfa39e][/i:1268bfa39e]........
Create Table with structure of another existing tableOk, this has many valid uses such as if you need to create backups or the ability to undo changes, you would want to create new tables with the same structure as another. Here is how you do it.
[i:7ed9581493]
Also remember Indexes such as PRIMARY KEYS [b:7ed9581493]will not be preserved[/b:7ed9581493] so you will have to readd them manually.[/i:7ed9581493]
[code:1:7ed9581493]CREATE TABLE NewName AS SEL........
ADD PRIMARY KEY to TableHere is an example of readding a PRIMARY KEY with an AUTO_INCREMENT field:
[b:40986c2a8b]First make the field NOT NULL[/b:40986c2a8b]
[code:1:40986c2a8b]
ALTER TABLE tableName MODIFY FieldNAME INT(18) NOT NULL;
[/code:1:40986c2a8b]
[b:40986c2a8b]Create The Primary Key[/b:40986c2a8b]
[code:1:40986c2a8b]ALTER TABLE tableName ADD CONSTRAINT PRIMARY KEY(FieldName);[/code:1:40986c2a8b........
Bash Script Infohttp://www.faqs.org/docs/Linux-HOWTO/Bash-Prog-Intro-HOWTO.html#ss10.5
http://www.scit.wlv.ac.uk/~jphb/spos/notes/shell/shell5.html
http://quong.best.vwh.net/shellin20/#LtohTOCentry-41
http://www.cactus.org/~dak/shellscript.html
http://db.ilug-bom.org.in/Documentation/abs-guide/
http://pegasus.rutgers.edu/~elflord/unix/bash-tute.html
http://heather.cs.ucdavis.edu/~matloff/UnixAndC/Unix/CShellII.html
Since bash i........
sed is great for pattern matching or retrieving linesHere is a cool example
Say you type df:
The output would be something like:
[quote:3bb8d51437]Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda2 1712432 1206664 418780 75% /
/dev/hda1 31201 10505 19085 36% /boot
none 30932 0 30932 0% /dev/shm
[/quote:3bb8d51........
Load Balancing Tutorialhttp://redundancy.redundancy.org/fbsd_lb.html........
Package managementIf you're like me and often like using an older version you'll need to know this.
Since all 5.x versions no longer have packages of their own you'll have to use the 5-stable
The best way is to set the [b:d5e8972240]packagesite environment variable[/b:d5e8972240] like so in your [b:d5e8972240].profile [/b:d5e8972240]file
[quote:d5e8972240]vi /etc/.profile[/quote:d5e8972240]
Add this:
[code:1:d5e897224........
CVSUp the Easy WayIf you're reading this you probably have never used CVSUp or don't know how.
CVSUp can be used for two things or just one if you prefer.
*Keeping your kernel up to date
*Keeping your port list up to date
Start by editing the following file in:
[b:76928b387d]vi /usr/share/examples/cvsup/cvs-upfile[/b:76928b387d]
It can be quite overwhelming with all the crazy options.
Basically there are only 3........
Windows Media PlayerJust one little question... and I'm not too sure if it falls into the hardware category... my Windows Media Player...or any music program for that matter buzzes at random and cuts out the music. But I don't think it's the music files themselves because I've put in regular CD's and have had the same problems. Any ideas on what the problem could be?Sounds like a soundcard/driver issue.
I would recommend updating your soundcard driver i........
Which operating systems do you prefer?I'm curious :0........
CDR Manufacturers - Why is so much media bad?I have searched for good media and tried many kinds for years. I guess I'll try to summarize my findings and conclusions.
Dye is irrelevant, dye of any color can be good or bad, it more likely depends on the manufacturer.
Speaking of manufacturers, the name at the top of the disc means nothing. For example, Memorex along with any other 'brand' is actually always made by another manufaturer including CMC Mag........
It's not all about the speed.I'd also thought I'd mention that speed is not everything. Routing is the key, because if one router you hit is slow then it doesn't matter how fast your connection is. I have found that locally, Telus has much better routing than Shaw (although I have not yet tested their new DOCSIS network).
There are also some countries such as Sweden that offer high speed connections, but the high speed only applies locally. The reason is that man........
camerawhich is a better digital cam to get a sony or a canonHey there,
I've only had an experience with the Sony, not the Canon. I think Sony uses the same lense as Canon from what I hear :).
Sony is damn expensive and there's no benefit over the Canon really. I don't know if Canon is the best, but I would pick them over the Sony.
You may want to specify which models you're comparing.........
Link Exchanges- Friendly AdviceI just wanted to make aware to the public who are paying to use Link Exchanges to get heavier traffic online and boosting their page rank in Google. Please be advised that this type of 'exchange' can very well get you booted off of Google and blacklisted by them! It's happened to many people and it's a very important tip. If you are on a Link Exchange, and have not been booted off yet; you MAY. Google is very smart and eventually they catch on. ;) Be ca........
ECS K7S5A Motherboard System Take Up To 2 Minutes To BootHi guys,
My motherboard is very strange. Sometimes it will take up to a few minutes to post. I have no idea it suddenly started doing this. I have tried everything and all I can figure is that it is somehow related to the USB ports possibly.
Why do I say this?
Because if I disconnect my scanner the problem occurs less frequently. I only have a printer hooked up to USB now and by........
Use Mozilla Firefox, not Internet Explorer - You'll be glad!Hey guys,
I just thought I'd recommend that everyone switch to Mozilla Firefox as their web browser. You can find it at http://mozilla.org
It is free and it is much better than IE. It has a built-in popup blocker which works great and most importantly, it doesn't have a million critical security flaws which could compromise your security such as passwords for on-line banking etc..........
NEC ND-3500A is great!I just picked up an NEC 3500A a few weeks ago and I love it.
It is a great all in-one optical drive solution.
It can burn DVD/+R-R at up 16x, read at 16x and rewrite at 4x and CD-R at up to 48x!
Not bad, but the impotant part is that it delivers consistent high quality burns and the drive is as quiet as I could ask it to be.
It's also convenient that it has a lot of hacked firmware for overspeeding of........
Basic Port ListingHopefully someone finds this useful or at least interesting.
http://www.sans.org/top20/#u9
Name Port Protocol Description
Small services ........
Linux Security Mini-tutorialThis site has a good tutorial to get you started on securing your Linux system. Although I'm sure all of our systems are already 100% secure :lol:
http://www.yolinux.com/TUTORIALS/LinuxTutorialInternetSecurity.html........
My list of handy security links - Ongoing[b:6f8d25be68][size=18:6f8d25be68]News[/size:6f8d25be68][/b:6f8d25be68]
Security Focus http://www.securityfocus.net - Nice Security News Site
CERT http://www.cert.org/
Common Criteria (see if your OS/software is EAL4 certified) EAL(Evaluation Assurance Levels is the industry standard for evaluation of security in software) http://www.commoncriteria.com
[size=18:6f8d25be68][b:6f8d25be68]Tools[........
Other Security Web SitesSeveral websites actively track security issues. This list provides you with the major providers
of security information on the Web. Many of these organizations also provide newsletters and
mailings to announce changes or security threats:
Center for Education and Research in Information Assurance and Security (CERIAS)
CERIAS is an industry-sponsored center at Purdue University that is focused on technology and
relate........
Clustering LinksI thought this might be interesting for people with spare time.
[b:6423c19973]Great clustering article from Linux Mag[/b:6423c19973]
http://www.linux-mag.com/2003-11/clusters_01.html
[b:6423c19973]General Linux cluster information[/b:6423c19973]
http://www.gdargaud.net/Hack/ClusterNotes.html#HighA
http://www.faqs.org/docs/Linux-HOWTO/Cluster-HOWTO.html#s3
http://www.yolinux.com/TUTORIALS/LinuxClustersAndFileSys........
Load Balancing/ClusteringAn interesting article that discusses the pros, cons and viability of load balancing/clustering
http://www.wwwcoder.com/main/parentid/493/site/4189/68/default.aspx
ZoneEdit seems to offer an interesting Fail Over Service as well:
http://www.zoneedit.com/doc/faq.html#fo........
Telus Begins Enforcing Bandwidth CapsIt appears Telus has begun to send e-mails out and is planning on enforcing bandwidth caps of only 10gigs/month for their 1.5mbit plan and 20gigs/month for 2.5mbit
The state of Canadian ISPs is horrible :(
In the east coast, Bell Sympatico will allow you to have unlimited bandwidth and even Aliant will and they have 3mbit for a much more affordable price than our 2.5mbit on Telus.
Telus needs to get wit........
I played around with xmit power (how much power in mW) to see if I could increase the range and signal strength. Idon't think this Linksys WRT54G's strength is the wireless, it seems to have poor signal quality and transfer rates all around.
Ithink part of the problem is also that there are several wireless networks around my house that could be interfering and the walls are thick here.
Anyaway, moving on now :) The default is 28mW and I increased it to........
gnuCash is available for all main platforms, Linux/Unix, MacOS (FreeBSD anyway), and Windows.
You can download gnuCash free from here.
It does seem to be fairly full featured and somewhat straight forward, but like so many programs it is missing a few key features or things don't work quite right.
It doesn't support importation of CSV files, which is a big minus. And the developers rather than wanting to add support have just dec........
*This is a bug with initramfs support, all kernels after around 2.6.27.54 suffer from this problem.
If you try to include initramfs into your kernel (I mean actually building your binaries into the kernel) this will always happen. Obviously some code has changed in recent kernels that is present in all new kernels, it makes it impossible to boot
I've tried the latest 2.6.32, 2.6.33, 2.6.34, 2.6.35, 2.6.36, 2.6.37, 2.6.38 kernels and they all do this. I found one bug re........
Linux Kernel v2.6.30.3
102220 blocks
CHK include/linux/version.h
CHK include/linux/utsrelease.h
SYMLINK include/asm -> include/asm-x86
CALL scripts/checksyscalls.sh
CHK include/linux/compile.h
CC drivers/net/igb/igb_main.o
drivers/net/igb/igb_main.c: In function `igb_up':........
The "Geoip" package is available on virtually all Linux and Unix like systems and is very handy in looking an IP address' corresponding country.
The homepage of the maintainers is here.
They also have a package called "Geocity" which can be downloaded from their site, it is still free and gives you a close indication of the city the visitor is from. You can........
This is a very weird, annoying and bizarre quirk with many distributions, especially Debian. The home and end keys don't work, but it's a simple fix as long as you found this article :)
You just have to edit /etc/inputrc:
Find the commented lines as shown below:
# "e[1~": beginning-of-line
# "e[4~": end-of-line
*If you can't find the above, just copy and paste the code below into your inputrc, it will en........
Put what you see below into your .htaccessand it will enable errors and notices. (change on to off and 1 to 0 to disable though)
php_flag display_startup_errors on
php_flag display_errors on
php_flag html_errors on
Now you'll be able to see errors and notices but this should really only be used for debugging purposes and only temporarily as it can be a security issue since errors can reveal information you wouldn't want hacker........
There is actually by default a "Default SSL" vhost that can mess things up for you and can cause surprising and unexpected results.
Default Apache SSL Cert
in /etc/httpd/conf.d/ssl.conf there is a default SSL Virtual Host which screws things up by offering itself instead of the SSL cert I specify in my own vhosts........
Shortcut/Easiest Way To Create A Self-Signed Key:
openssl req -new -x509 -nodes -days 1530 -out server.crt -keyout server.key
Using the above, you instantly create a self-signed certificate valid for 1530 days and you can simply skip to step #5.) below.
If You Need a Real SSLCertificate (eg. Equifax/Openssl) then you need to create a CSR request (you'll need to follow Steps 1.) and 2.) in order to create the CSR. You then upload the CSR Certi........
I've gotten this error enough to bother posting about it, because I've come across so many servers where this happens, so what could "Error 28" possibly mean? Is your database corrupt, or is this a sign of a RAID failure/corruption or even worse, bad blocks on a clients system who has no RAID and never took backups?
No, check your free blocks, it simply means you have no space. This was the result of a script that was overzealous and backed up the entire database........
100215 07:02:24 mysqld started
/usr/libexec/mysqld: Can't read dir of '/tmp/' (Errcode: 13)
/usr/libexec/mysqld: Can't create/write to file '/tmp/ibyP1qUC' (Errcode: 13)
100215 7:02:24 InnoDB: Error: unable to create temporary file; errno: 13
100215 7:02:24 [ERROR] Can't init databases
100215 7:02:24 [ERROR] Aborting
100215 7:02:24 [Note] /usr/libexec/mysqld: Shutdown complete
100215 07:02:........
This really is a difficult and confusing process for non-Mandarin speakers, but here's what I've done and learned so far:
You can purchase an "M-Zone" China Mobile pre-paid SIMCard from almost anywhere but I tried to purchase mine from Suning (a large electronics dealer) hoping they would be able to help me or answer my questions but my plan didn't work out at all. At Suning once I found someone who spoke some English they gave me the 55 RMB M-Zone China Mobile P........
Everyone says there is a "manual" way of doing it and then they tell you to use iTunes, but if you're like me, you're travelling on business in a foreign country and your laptop does not have iTunes and you don't have a way of getting it and/or don't want it.
For this example I'm using the provider "du" in Dubai, UAE (United Arab Emirates) but this method works for virtually all providers.
The requirements in this case to truly "manually update........
This is something that happens a lot and it is very dirty, as you probably know each site is hosted on a certain IP address. Sometimes a domain is hosted by a single IP address and the IP address defaults to this very same domain.
This means that if someone buys domain abcd.com and enters your IP address (the one of your website) as the A record, your content will show up on their domain as if it was their own.
There is an easy way to prevent this by using .htacces........
There is a nice mode that Samba supports which you can add to smb.conf
create mode=555
This way users can create and write files/directories without deleting (except I believe dirs can be deleted but only if there are no files inside).
It's too bad that Linux does not have built-in "write"/"delete" privileges and is something that even Windows 98 can trump.........
I bought a Dynatron A46G for my AMD X4 620 AM3 Quad Core CPU. Just judging by touch, the stock OEM fan/heatsink combo kept things so cool, I could leave the 1U server on the floor and it barely felt warm to the touch, including the heatsink itself.
I thought the Dynatron A46G would be enough with passive cooling (it has no fan), but the same setup became burning hot on the underside of the server and also by touching the heatsink itself within minutes.
I thought that th........
I was starting to panic because suddenly my 1TB Seagate SATA drive wasn't working,I thought it was a BIOS issue because it seemed to have happened after I tried overclocking my Desktop too much.
I tried powering down and waiting, but I still couldn't hear the drive spin up at all. I tried a second 1TB hard drive and it wouldn't work either. I checked all power connections again and again until one of the pins in the MOLEX connector popped completely loose.
Th........
You can see the problem below, GRUB recognizes my hard drive and sees the partitions but cannot access them. This is from the GRUB boot disc I'm using.
What happened is that I had some power issues causing this system's power to be interrupted several times and basically an on/off on/off situation.
The system won't boot, I just get a flashing cursor and no message or error from GRUB. Obviously the problem is that my MBR seems corrupt or some other issue.
My........
The results are still not flattering and are nothing close to native performance. Unless GlusterFS has a "DRBD-like" option to delay writes over the network and to only read from the client side, I don't see how performance can ever improve much more.
After doing some client optimizations Iadded more to the score:
Start Benchmark Run: Sun Nov 29 00:37:44 PST 2009
00:37:44 up 3 min, 1 user, load average: 0.01........
I've tried to find a good sensible solution to cluster with and each technology has it's pros and cons and there is no perfect solution and I've found a lot of "exaggerations" in the applications, benefits and performance of these different filesystems.
DRBD
I first started off with DRBD and Ihave to say it does live up to the hype, is quite reliable (although it can be annoying to match up the kernel module and user applications since they must match and whe........
You might remember my original GluserFS/OpenVZ benchmark which produced a horrible 29.8
This is the exact same system, but using the latest 2.0.8 (with some small files patch which speeds up performance) you can see it is about 25% faster.
I also haven't tuned my config files at all, but there are some settings that should increase performance on small files which I believe i........
Inever saved any of the logs, but basically no matter what OS (Linux)I used, I could not get my 1000GB hard drive to work (Seagate SATA). The BIOS recognizes the drive and fdisk -l shows the hard drive as it should.
The tricky thing is that different OS's will give you different results, but don't be fooled. You can't use these larger drives for long. Iwas getting all kinds of seek/IOerrors and also messages that the port could not be read.........
Itried everything Icould think of, and of course even with the NIC enabled in the BIOS nothing was working. The light would flash when you plugin the cable for a second, but that's all.
Due to another issue I'm about to post about (server is not compatible with 1TB/1000Gig Hard Drives), I updated the BIOS. I didn't even know the 100mbit NICs were not working untilI decided I should test each NIC one by one.
Inoticed that only 1 server out of........
This is very disappointing since GlusterFS markets itself as a solution to deploy VPS servers on. On the HNitself I get a Unixbench of about 360.
I'm also using an SSH tunnel to secure the communications, but even before that, things seemed very slow.
# # # # # # # #####&n........
In those 4 simple commands you can setup mutual key exchange between two sshservers by using a single login shell session and single window.
*Just change the IP address examples of (10.10.0.2) to the target of your mutual key exchange. It doesn't matter if the server is on a LANor WAN(well unless the server is behind a firewall and you cannot SSHinto it).........
Have you ever seen this dreaded message in your Apache/HTTPD /var/log/httpd/error_log?
[error] server reached MaxClients setting, consider raising the MaxClients setting
The error itself is slightly misleading. Ibelieve this happened to one of my servers, I found Apache was running still, and that you could telnet to port 80 but no respnose would be given.
For some reason my error log initially did not have the above error, but after a restart I saw........
In Newer Linux Distros This Way Is Easiest and works on newer versions like Ubuntu, Mint, Fedora, Centos, Debian etc.
#if you are missing timedatectl this in newer distros like Ubuntu/Mint/Debian and are using a container like Docker then do "apt install systemd"
timedatectl set-timezone America/Vancouver
Replace the America/Vancouver with the correct timezone.
To see the list you can just type "timedatectl set........
For some reason Ikeep getting this error when trying to run a sudo command eg:
sudo -u someuser somecommand
sudo: Error dropping capabilities, aborting
My version of sudo is:sudo-1.6.9p17-3.el5_3.1 and I've heard that version 1.7 fixes everything. The only thing is yum does not think sudo has any update. Iguess the new version has not been committed to the RPM repository yet.
This is really a huge and ann........
A VPS Server I had just wasn't working right, code that I migrated there just wasn't working. For example, it kept telling me the connection to the database was unsuccessful, halfway through iterating through results it already had.
Then I realized it wasn't my code. Ichecked my /proc/user_beancounters and found this:
cat /proc/user_beancounters
Version: 2.5
uid resource held maxheld barrier limit failcnt........
Backing MySQL Databases
Backing Up/Dumping All Mysql Databases To A Single File
mysqldump --all-databases -u admin -p > allmysqldatabases.sql
The "-all-databases" clause is pretty obvious isn't it? It means that it will backup all databases.
The "-u admin" means login using the user "admin", if you h........
I was getting very frustrated one day wondering why it appeared my .htaccess file was being ignored and not processed by Apache. No matter what I did it was obvious that Apache didn't care about my .htaccess file. Then I realized that the default settings must be in effect, which is that my vhost didn't explicitly allow me to override the default settings.
This usually comes down to your vhost settings. Make sure you have an entry like this in your Apache vhost settings in........
This is something that annoys a lot of people, fortunately the Redhat style OS's are the most simple in this respect. I disagree that Debian's way makes sense, it is more of a hackish approach in how they implement iptables.
Anyway, for those who are using Redhat/Centos style OS's it is very simple.
Set your rules from the shell/command prompt and to save the iptables firewall rules so they are remember/loaded on boot just run this command:
service iptables........
As shown below you can find ringtones in the "/private/var/stash/Ringones*" directory of your iPhone.
Different reports have said that the .m4r format is really an MP4 file and some have said AAC and some also say "it's the same as the M4A" format. Whatever the case is, one easy way is to install the silent theme from Cydia and copy that into your ringtones directory.
/private/var/stash/Ringtones.sh7cLj root# ls
Alarm.m4r ........
There is a tool called "xml2" which will parse both HTML and XML scripts, this is very useful to do a mass extraction or conversion of data based on say an HTML table etc..
It becomes even more powerful using bash if certain tags are identified with a certain class="" attribute or something else unique to only the tags you want.
Happy parsing.........
There have been lots of reports like this going around and Ican confirm my 3GS with 3.0 firmware is overheating as well. It gets quite hot and actually can make your head or hand sweaty when holding it to talk, or simply holding the back cover for any reason.
It's a wonder how the device cools itself at all, considering the only thing that could ventilate air are the 2 speakers at the bottom or the single speaker on the front of the device.
Apple seems to be making........
This is pretty bad, ever since my phone has been unlocked the battery life is horrible. Many others have reported this issue on provider unlocked phones and even jail broken phones. We're talking issues as bad as losing 1% every 3 minutes which is what I seem to have observed as well.
For now I'm going to relock the phone, and hopefully a firmware update will address this issue. This is very annoying and it seems apparent this is also happening on 3G phones and that........
Has Apple tried to give a golden egg to the cell phone companies? Has anyone noticed that if you set your lock time to x minutes, the phone doesn't just lock, it goes into standby. When it does this, any WiFi connection you have gets dropped and all push/data functions such as e-mail checking are done through the 3G network.
There is no way to change this feature and functionality and it's very annoying, especially if you are downloading something or loading files over the........
First of all, the iPhone is crippled in many ways, but most of my complaints about functionality have been addressed through the jailbreak, Ican run apps in the background of my choosing, I can install a terminal, acccess my phone through SSH and SCP and so much more.
It even addresses the 15 minute e-mail problem, I installed a program called "PushMod" and now set the checking time to just 1 minute.
Apple should really thank the developers for this gift, it ma........
Everything was working fine but I believe when Iturned off "EDGE" in Big Boss everythign went haywire, at first my WiFi dropped, then 3G didn't work and I couldn't even make phone calls.
If you're having this trouble with your jailbroken 3GS running 3.0 firmware, make sure you don't turn off EDGE, it seems to disrupt all service to your phone.........
First of all you need to be jailbroken, but this is not covered here.
Go into Cydia and click "Manage Sources" then "Edit"and add: repo666.ultrasn0w.com
Then search for "ultrasn0w" as a package and install it, that's all there is to it, your iPhone is finally unlocked so when you travel abroad you can avoid ridiculous roaming charges, or you can switch providers and use any SIMcard you like.
You'd really thi........
Apple crippled the iPhone by not allowing multi-tasking of the non-primary apps. I use SSH a lot and I don't want to close my session just to check my e-mail, etc, now an app found in Cydia called "Backgrounder" allows just that.
Although it's not perfect, we installed the correct one for "3.x" iPhones and hit "Reload SpringBoard" and the hour/circle glass has just been going for minutes.
It seems like it installed fine even with the crash t........
This happened during a sync of my iPhone while installing some apps. This usually happens to non-jailbroken iPhones who are trying to install non-Apple approved software OR jailbroken phones who haven't done the "Sync update".
How to fix this error and get the Sync Update
Open Cydia - Manage - Sources - Edit
Add this source: http://cydia.hackulo.us
Then under the section "Hackulo.us" install "Ap........
Truly, the only way to unleash the capabilities and customization abilities of iPhone are to jailbreak, it's not just for hackers anymore.
A few days ago someone by the named of "geohot" released a single click application called "purplera1n", which does the entire operation smoothly and seamlessly.
In our case, the first time it went as far as "done, wait for reboot" on our Windows machine and for minutes we waited and saw the pic on the iPhone w........
Yes, Iadmit I finally got bitten by the hype as much as I can usually see through it all. Keep in mind this review is of the "stock" phone, no jailbreaking yet which is what really unleashes the customizability and whyI bought iPhone.
I had better things to say about this phone before buying it, and it is a great phone, perhaps the best on the market by far, if not because of the Mac OS port onto the iPhone and all the apps, etc, etc.
With that said........
I kind of expected this feature to be there in some form, to stay ahead of the pack Apple needs to stay on top of this. User's of HTC's Android smart phone which uses a Linux based OS with Google's power behind it, note that you can save passwords in the browser on that phone.
Apple needs to continuously evaluate the needs in its core apps and make sure the features are cutting edge and top notch, if other phones come out with some of these seemingly small but essential features........
This is unfortunate and frustrating as many sites use it, a lot of people are frustrated that TinyMCE does not work on the iPhone Safari browser.
Apparently the developer of TinyMCE's answer is "talk to Apple about it"
It's really frustrating although, I wonder if any other mobile phones are able to use TinyMCE or not, whatever the case is it would be nice to find a solution to use TinyMCE on the........
The dmg format is silly and annoying to work with, why couldn't Apple stick with the .iso standard? Anyway, there's an excellent Linux and Windows based tool to convert it back to a normal .iso Image called dmg2iso
I'll only cover theLinux version although the Windows pre-built binary works the same way.
Download dmg2iso here for free (from the author's website)
It's just silly and doesn't make sense that Ubuntu doe........
As much of a computer nerd as Iam, I'm usually a late adopter to technology for a few reasons. Ifeel most new hyped technologies and electronics are mainly fads, and I'm also cheap.
Adopting later means you avoid the bugs, kinks and most importantly pay the lowest price, that's me being cheap again :)
I never read much about the iPhone but Isaw all the hype around it and until recently I wasn't a big fan of anything Apple until a few years ago I realize........
I've had an old Blackberry for a few years and I was ready to spend some serious cash on a nice Nokia. I love the idea of the Linux based Symbian S60 OS, so I was looking at phones like the E63, E71 (both are basically the same, at least CPU/screensize although E71 is thinner, has a 3MP camera, has GPS, and has dedicated buttons to adjust the volume).
Then Iheard about the N97 and what a revolution it was supposed to be and it was even compared to iPhone.
To........
This is the Intel Atom 330 motherboard with integrated Realtek Gigabit NIC (Intel Desktop Board D945GCLF2 Motherboard W/ Atom 330 1.6 GHz Dual Core Processor - Mini-ITX)
I cannot achieve more than 15 MB/s, even doing a local transfer through eth0 to it's own IP.
100% 95MB 15.9MB/s 00:06
So this is not a cabling, switch or hardware issue, it seems like a driver or chipset limitation problem.
Here is my........
Icouldn't understand why on one system it took a few minutes to get the SSHlogin prompt when connecting to other systems. The other systems all had the UseDNS parameter set to no, which almost always resolves the login prompt delay.
The reason is Ubuntu and perhaps Debian and other distributions /etc/nsswitch.conf file
Edit yours to have the "hosts" line like so (notice that files and dns are the primary resolution choice........
resume: could not stat the resume device file
I got that after migrating to a different physical hard drive, it wanted to resume from a swap partition that no longer exists.
This is actually controlled by "uswsusp.conf" in /etc
Just edit it and remove the device or change it to the correct new swap file.........
genisoimage: Directories too deep for 'Backup/My Documents/My Music/iTunes/Album Artwork/Local/5928CE9C1AFAC465/07/15' (7) max is 6.
Some people said choosing the --iso-level-4 option will help. I just opted to add the "-D" switch and everything was fine.........
This is really something the SSHServer developers should consider. The cause of this annoyance is because of failed DNS lookups on your IPaddress, which is especially common for many dedicated/col-located servers and also computers on internal NAT/private networks.
The chances are this is the cause of your SSHSlow/Delayed Login problems.
The easy solution to SSH Login Problems
Edit /etc/ssh/sshd_config
Add this line to disable r........
Igot this after copying a VMWare image onto another machine in Debian.
SIOCSIFADDR No such device eth0 error while getting interface flags
The solution
1.) Find and edit the device line in persisent-net.rules note it will be prefixed with something like z25 or something else.
vi /etc/udev/rules.d/z25_persistent-net.rules
The easiest way is to comment anything out.
If you are feeling........
When trying to even cd or ls the mounted OCFS2 partition it crashes. Ithink this is a combination of VMWare Server's problem and the way I mounted and symlinked to it.
More than anything this shows the problem and lack of forsight with VMWare, but also that OCFS2 is easily crashed if you do strange things.
Output of /var/log/messages for OCFS2
Apr 10 15:57:45 localhost kernel: [84331.691258] Modules linked in: vmnet vmci vmmon ocfs2_stac........
Server not using user level security and no password supplied.
tree connect failed: NT_STATUS_WRONG_PASSWORD
That happens when trying to use smbclient to connect to a share. The weird thing is that I can authnenticate just fine from Windows XP.
It is partially my mistake, I forgot this share does have a password. I've tried authenticating with the correct user and also with "Guest" because this works in Windows. In Linux I ........
There's a lot of information and guides on OCFS2 for RHELand Centos Linux but the package setup and configuration is slightly different and this has thrown some people off.
Installing OC2FS
You should install the following packages to get started:
apt-get install ocfs2-tools ocfs2console
Configure OC2FS
In RHEL/Centos the main configuration file is located in /etc/sysconfig/o2cb
However in Debian based Linux it is located........
This will give you the basic info needed to browse and connect to Samba shares from the command line. From the GUI of Gnome or KDE etc, it is pretty standard and straight forward. However, I've found very little guides on how to do it from the command line and if you're like me, a nerd who prefers command line for its simplicity and for remote use, this is the way to go.
First get a list of all the Samba/SMB shares on the target.
smbclient -L hostname........
Ithink there has been a lot of negative press towards Rackable Systems. We will give their new solution credit that it is marketed very well, and comes prepackaged and ready to go.
But let's cut through the hype of both sides, the people who love this concept and the people who hate it.
What Rackable Systems have done is a first, to minimize space, power and costs into small servers. This is great, and many companies have already built their own servers based........
((: 08: value too great for base (error token is "08")
Here is the code that caused it for ((track=1;track ........
I've been struggling with this for awhile, wondering why all of my variables are null. Ijust realized the variables disappear after leaving this while loop.
Note that I'm piping to the while loop which makes a subshell Ibelieve which is the cause of the issue:
echo "$accounts"|while read thisline; do
somevariable="some value"
(( ++counter ))
done
At all costs you ne........
User username from 127.0.0.1 not allowed because not listed in AllowUsers
What's going on? The user was created properly, it has been defined as having a shell entry and the entry for /etc/passwd and /etc/shadow is set just fine.
This is a new and very smart/secure feature of SSHD. It is simple and yet effective, but also very annoying if you didn't know about it being implemented and that hand editing of /etc/ssh/sshd_config is required to allow a newly add........
This happened on one of my Ubuntu machines where Igot some kind of segfault on line 21 from LAME at random while encoding MP3s (a second try is fine usually). I've read that it's best to compile it from source and that has solved most issues for people.
Here is my preferred configure line:
./configure --enable-mp3x --with-fileio=lame --enable-debug --with-vorbis
Even with that I got a different error this tim........
At this time we can't resolve Enom's website and all DNS requests to their 4 primary name servers are failing, although the hostnames themselves still resolve:
Name Server: DNS1.NAME-SERVICES.COM
Name Server: DNS2.NAME-SERVICES.COM
Name Server: DNS3.NAME-SERVICES.COM
Name Server: DNS4.NAME-SERVICES.COM
Name Server: DNS5.NAME-SERVICES.COM
You would really think Enom, bein........
There's a lot of outdated information and confusion for system administrator's out there.
One annoying task for many an Administrator has been backing up data in Linux. You don't need any GUI tools such as K3B or GnomeBaker. Both are excellent tools but for veteran command line users working remotely, using the keyboard is a great and possibly automated way to save yourself pain and hassle.
At a later date we'll cover how scripting can automatically backup certain........
http://searchenginewatch.com/2165111
This was an interesting article and people should be wary of Google's power. Google's policies and actions against competitors borders on anti-trust, far worse than Microsoft.
They are doing the right thing for all of us, Google says selling advertising and links is bad for search engines, yet they don't penalize sites who use AdSense.
........
We've noticed in many ways that traditional networking even in WANs and LANs has changed very little. Years ago most networks were running on 100mbit and today most still are.
Even the average internet connection is largely unchanged from several years ago with some minor exceptions from Europe and Asia.........
We have years of knowledge with technology, especially in the IT (Information Technology)industry.
realtechtalk.com will always have fresh and useful information on a variety of subjects from Graphic Design, Server Administration, Web Hosting Industry and much more.........