• LUKS unable to type password to unlock during boot on Debian, Ubuntu and Mint


    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........
  • Debian Ubuntu and Linux Mint Broken Kernel After Date - New Extra Module Naming Convention


    This is something I've seen some run into. Take an old install of Linux Mint 18.1 ii linux-image-4.4.0-53-generic 4.4.0-53.74 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP i........
  • Wordpress overwrites and wipes out custom htaccess rules and changes soluton


    cat .htaccess RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . index.php [L] I keep reading there is a "# BEGIN WordPress" and a "# END WordPress" in the wordpress htaccess above but there is clearly not. Even more strange is that my permissions are just 444 (read only). so i changed it........
  • Apache htaccess and mod_rewrite how to redirect and force all URLs and visitors to the SSL / HTTPS version


    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........
  • Virtualbox vbox not starting "No suitable module for running kernel found"


    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. So the first thing you should do is install your kernel source by running this: sudo apt-get install linux-headers-`uname -r` Then install the dkms/kernel module for vbox sudo apt-get install virtu........
  • Bind / named not responding to queries solution


    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";........
  • ImageMagick Convert PDF Not Authorized


    You'll have to edit the policy.xml file to fix this: convert -density 300 output.pdf agreement.jpg convert.im6: not authorized `output.pdf' @ error/constitute.c/ReadImage/454. convert.im6: no images defined `agreement.jpg' @ error/convert.c/ConvertImageCommand/3044. sudo vi /etc/ImageMagick*/policy.xml #change # ........
  • ImageMagick Converted PDF to JPEG some files have a black background solution


    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........
  • Ubuntu/Gnome/Mint/Centos How To Take a partial screenshot


    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 how to verify your host key / avoid MIM attacks


    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........
  • Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions


    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. Here is Cisco's guide (timing is everything and it is more tricky than trying to jail break your iPhone): Step 1 -- While powering up the phone, press and hold #. Step 2 -- When the light on the mute button and h........
  • Linux Mint 18 Disable User Name List from showing on Login Screen


    Click "Administration" ->"Login Window"........
  • Firefox Cannot Hit Enter Key In Address Bar and Location History Not Working


    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........
  • Cisco Unified Communications Manager / CUCM IP 8.6,10,12 Install Error Solution


    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........
  • Ubuntu Debian Mint Linux SSHD OpenSSH Server Not Starting After Reboot Solution


    If you get error messages like this it is usually because /var/run/sshd does not exist. root@userbox:/# service sshd status ● 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)........
  • Windows 7,8,10 and Server 2008, 2012, 2016, 2019 Read Only Attribute Won't Go Away


    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........
  • Cisco Unified Communications Manager 12 Install Errors on Proxmox/KVM


    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 ........
  • Cisco Unified Communications Manager 12 CUCM 12 - How To Enable Video Calling


    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.........
  • Cisco Unified Communications Manager / CUCM IP Telephony Definitions


    DN = Directory Number: It is basically the extension of the phone In the example below, 55 is a DN assigned to the phone.........
  • tftp Linux xinetd verbose logging


    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........
  • QEMU-KVM Windows and Server Guest Installs Mouse Tracking Pointer Location Solution


    You may have noticed if you are running QEMU/KVMmanually that in Windows the the position of the physical mouse does not match where the mouse is positioned within Windows. There is an easy command to pass to qemu-kvm or qemu-system (whatever you call your binary): -usbdevice tablet The above flag will fix your mouse pointing problems whether you are running Windows 95, 98, NT, XP 2000, 2003, Vista, 7, 8 10 or Server 2000, 2003, 2008, 2012, 2016 or 2........
  • SSH Keep Alive To stop Disconnections


    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)........
  • Linux How To Disable SATA NCQ For Better Performance


    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........
  • WebRTC Vulnerability Shows Local IP Address Even When Using a Proxy or VPN Firefox Fix And Disable Solution


    If you visit a site that exploits the WebRTC vulnerability including whatismyipaddress.com it may show "Local IP Address" which would be the real IP of your machine. The vulnerability works on Windows and Linux machines (contrary to false information on the web which claims it only affects Windows). The above works and happens even if you are using a proxy or VPNaccount like ProVPNAccounts.com It is easy........
  • chroot in Linux Howto Simple and Easy Guide


    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........
  • qemu-kvm qemu-system 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 'ra


    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........
  • Linux Over VNC VMWare How To Switch Virtual Terminals Console Without Using Ctrl+Alt+F1


    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........
  • Skype For Business 2015 and 2019 Guide, Reference, Howto and Troubleshooting Solutions


    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........
  • Centos 6 or 7 no DHCP IP during startup on first boot or reboot solution


    This is usually because of STP causing a delay in the negotiation. Edit your ifcfg script eg: /etc/sysconfig/network-scripts/ifcfg-eth0 Add a LINKDELAY of 30 seconds or whatever works for you: LINKDELAY=30 After that you should have an IP during bootup.........
  • Linux bash prompt why does it not show username@host and the current directory?


    Perhaps you've just seen this in the bash prompt: -bash-4.1# Instead of the expected user@hostname# It is probably because you are missing .bash_profile or .bashrc in your home directory Check for yourself: ls -al ~/|grep -E ".bash_profile|.bashrc" -rw-r--r--. 1 root root&nbs........
  • Microsoft SQL Server Check What Version is Running


    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 ........
  • How to install and setup LXC Containers (OpenVZ alternative) on Centos 6 / 7


    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:........
  • Cisco CUCM Unified Communication Manager Howto Guide and Tutorials


    Shutdown/restart the actual server utils system shutdown utils system restart show hostname show myself change set or reset password set password user [username] set hostname set network hostname service management........
  • ssh reverse proxy to enable remote access behind a LAN and firewall


    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........
  • How To Use Letsencrypt SSL/TLS Encryption to Create Certificates without installing on the target machine


    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   Eventually you will get prompted to create a certain path and file with certain data: Create a file containing just this data: Casdfasfadsfsad........
  • Cisco Router Setup Guide and Tutorial Howto With Commands and Examples


    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). In these examples I as........
  • Cisco DHCP Snooping Relay Setup Information


    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........
  • Cisco Switch Setup Guide Command List


    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........
  • Cisco 2960 Switch Reset To Factory Defaults


    *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 configuration is reset and the system will now reboot 00:04:09: %SYS-5-REL........
  • How To Boot Cisco CUCM UCSInstall 8.6, 10, 11 and 12 on KVM/Proxmox


    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........
  • VBOX VirtualBox How To Import Raw .img Disk File


    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........
  • Ubuntu 18.04 / Linux Mint 19.1 Cannot Type or Login - solution


    It was broken because of this package for xorg I installed: xserver-xorg-core-hwe-18.04 Just remove it even if you have to chroot from a live USB/CD: sudo apt-get remove xserver-xorg-core-hwe-18.04........
  • LUKS Hard Drive Encryption on Linux Mint Ubuntu Debian etc how to mount encrypted hard drive


    The key thing here is to know the actual partition that is encrypted. Often in Linux Mint's installer that ends up being partition 5 or /dev/sda5 sudo cryptsetup luksOpen /dev/sda5 anynamehere You will then be prompted for your irrecoverable passphrase: Enter passphrase for /dev/sda5: If all goes well it won't say anything further. If it says ""No key available with this passphr........
  • Linux Mint 18.2 Create Config File To Start Application Upon Login


    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........
  • sudoers file in /etc warning about comments/includes!


    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........
  • letsencrypt certbot error "Unable to find a virtual host listening on port 80 which is currently needed for Certbot to prove to the CA that you control your domain. Please add a virtual host for port 80."


    ./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........
  • SSH error cannot Forward or Listen "bind: Cannot assign requested address"


    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........
  • Using Microsoft's Group Policy Management Editor (GPME) To Change Default Permissions and Internet Explorer Security Settings


    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.........
  • VMWare Pro Workstation Nic Disconnected and No IP Using NAT


    By default VMWare Workstation often doesn't work as we would like. If you create a VM with a default NAT IP it won't work you will find the NIC is disconnected (even though on the VMWare side it says connected including at Power On). How To Solve It 1.) Create New VMNet for NAT Click "Edit" -> "Virtual Network Editor" Click "Add Network" Select Network To Add "VMNet1" (........
  • mdadm force resync when resync=PENDING solution


    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........
  • Debian 9 SSH root password authentication failure password not working problem / solution


    In Debian a lot of times SSH disables the root user to login by password by default. This means you will get an authentication failure as if you typed in the wrong password. The logs also indicate the password is wrong but what is often the case is in the config file Check /etc/ssh/sshd_config cat /etc/ssh/sshd_config|grep -i permitrootlogin Make sure it says: PermitRootLogin yes If not change it and restart SSH........
  • PHP Issues With Decoding Strange Smart Quotes And Non-Standard ASCII Characters


    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........
  • /etc/iproute2/rt_tables default settings file in Linux Centos 6,7 and most other NIX's


    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........
  • bind named error solutions named[2169]: error (no valid DS) resolving / error (broken trust chain) resolving / : error (no valid RRSIG) resolving 'com/DS/IN':


    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........
  • How To Edit Linux Based NM Network Manager Connection Settings Without GUI


    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........
  • Linux use growisofs to burn a larger file on a BD-R / Bluray Disc


    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........
  • Linux partprobe/partx cannot access last and 4th partition


    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........
  • DRBD Errors Caused By Physical Corruption


    In a RAID array I had a have periodically lost a drive here and there over the past several months. Iwas always able to readd and resync without losing data. However at some point it looks like some minor corruption happened and this makes DRBD unhappy. Using fsck did not help either. Dec 19 06:01:45 storageboxtest4 kernel: [19005.945890] EXT3-fs error (device drbd0): ext3_get_inode_loc: unable to read inode block - inode=22184379........
  • mdadm: add new device failed for /dev/sdb4 as 3: Invalid argument solution


    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........
  • Adobe Acrobat Reader for Linux to use and view XFA Fillable Forms


    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........
  • Why SMART is not smart at all and doesn't properly predict disk errors that cause a kernel panic or crash


    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........
  • iSCSI on Centos 7 Configuration and Setup Guide for Initiator and Target


    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........
  • httpd AH00534: httpd: Configuration error: No MPM loaded. solution


    httpd AH00534: httpd: Configuration error: No MPM loaded. Simple Solution (assuming you don't have this line in httpd.conf aleady: echo "Include conf.modules.d/*.conf" >> /etc/httpd/conf/httpd.conf ........
  • bash scripting how to create a function


    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........
  • Centos 7 PHP MySQL Not Working Solution


    PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so' - /usr/lib64/php/modules/pdo_mysql.so: symbol mysql_options, version libmysqlclient_18 not defined in file libmysqlclient.so.18 with link time reference in Unknown on line 0 #not sure what is wrong with php-mysql but I removed it and installed mysqlnd yum -y remove php-mysql yum -y install php-mysqlnd........
  • How Does Cisco CUCM (Cisco Unified Communication Manager) Work?


    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 DNS Options Does Active Directory Offer in Windows Server 2008,2012,2016 ?


    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........
  • syntax error, unexpected T_SL in PHP Solution


    This happened in a PHPscript with heredoc but it could really happen anywhere. The issue was whitespace in code like this: $variable = ........
  • How To Mathematically Convert and Calculate Binary Value To Decimal Value


    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 management using systemctl and journalctl to check systemd logs


    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........
  • Linux What is umask (user mask) for file and directory creation permissions and how to calculate umask and change the defaults


    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........
  • Linux Permissions and Groups Real Usecase for Group Access


    Ihave a directory structure which the primary user needs full access on but wanted a user to access only a specific directory within the main directory (so they could write in there only and nowhere else). Here's what Idid: [root@compevo8001 dllnow]# ls -alh drwxrwxr-x 2 someuser software 4.0K Oct 19 2017 ExpireYMD-2017-11-20 drwxrwxr-x 2 someuser software 4.0K Nov 19 2017 ExpireYMD-20........
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  • MySQL Cannot Update/Write to any database table solution


    This happened on Centos for no apparent reason with no obvious issue in the logs. Data could be read fine but not written (possibly due to some corruption or out of memory issue in the OpenVZ container is the best guess). All mysql update and insert queries failed freezing without any error log on any database and table. Tried to restart: service mysqld restart Timeout error occurred trying to stop MySQL........
  • MySQL Maximum INT Size Truncation Issue/Warning


    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........
  • PHP geoip.so fatal error Solution


    PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/geoip.so' - /usr/lib64/php/modules/geoip.so: undefined symbol: GeoIP_country_code_by_name_v6 in Unknown on line 0 Remove the GEOIP from PHP: php71w-pecl-geoip-1.1.1-1.w6.x86_64 PHP Fatal error: PHP Startup: apc_shm_create: shmget(0, 67108864, 914) failed: Invalid argument. It is possible that the........
  • possible SYN flooding on ctid 42131, port 80. Sending cookies. - Solution


    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_........
  • Install Windows From a Linux TFTP Server instead of using WDS Solution


    yum -y install samba vi /etc/samba/smb.conf https://www.kernel.org/pub/linux/utils/boot/syslinux/syslinux-6.03.zip mkdir syslinux;cd syslinux;unzip syslinux-6.03.zip mkdir -p /tftpboot/libs/ cp bios/com32/modules/linux.c32 /tftpboot/libs/ cp bios/com32/libutil/libutil.c32 /tftpboot/libs/ cp bios/com32/lib/libcom32.c32 /tftpboot/libs/ #add lib path echo "PATH libs" >> /tftpboot/pxeli........
  • tftp: client does not accept options - solution if you are using UEFI PXEBoot disable it!


    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!........
  • Authentication refused: bad ownership or modes for directory /home/user SSH Public Key Authentication Failed Solution


    First of all I got this error after accidentally messing up my usergroup by using usermod -G user group When I would login using SSHkeys it would fail: sshd[2020]: Authentication refused: bad ownership or modes for directory /home/one No worries, the fix is simple! chmod g-w /home/use........
  • pcimodules and lspci not working alternative solution


    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........
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  • cannot mount kvm ntfs image


    guestmount -a kvmuserscra.img -m /dev/sda1 mount libguestfs: error: mount_options: /dev/sda1 on / (options: ''): mount: unknown filesystem type 'ntfs' guestmount: '/dev/sda1' could not be mounted. guestmount: Did you mean to mount one of these filesystems? guestmount: /dev/sda1 (ntfs) guestmount: /dev/sda2 (ntfs) yum -y install ntfs-3g still........
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    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;  ........
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    So you've got a responsive site with tables but it breaks them so anything not viewable on the screen is now cut off. Here is a simple solution that will allow users to scroll horizontally so they can see the whole table: &........
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    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........
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    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........
  • vbulletin 4.2.5 after upgrading from 3.6 white screen fatal php errors


    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 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.


    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........
  • kdenlive - No LADSPA plugins were found! Check your LADSPA_PATH environment variable. [producer_xml] failed to load transition "qtblend"


    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........
  • /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.


    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........
  • MySQL: table is marked as crashed solultion


    myisamchk can fix it But be careful and use the right options to avoid losing data. In fact if you haven't you should make a backup or at least manually copy /var/lib/mysql. Replace "YourDB" with the name of your database Replace "yourcrashedtable" with the name of your crashed table. The -o option is the safest and should avoid dataloss whereas -r is more aggressive and is a last option (I have lost data using -r and........
  • l2tp ipsec VPN Error 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


    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 5.9 Working Vault Repo file


    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........
  • Disable SSH Password Authentication to Increase Security and Harden SSH Linux Unix Server Ubuntu Mint Centos Debian


    Just a note before you do this you should have a sure, guaranteed way into the system such as local, KVMor preferably publickey making bruteforce SSH absolutely impossible since there is no password to bruteforce and even if someone knew the password they wouldn't be able to login except from the local console (presumably you should make sure no one unauthorized has physical access). 1. Edit /etc/ssh/sshd_config Find the section like this:........
  • Cannot allocate TUN/TAP dev dynamically - FreeBSD/OpenBSD OpenVPN Client error Solution


    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........
  • Linux Mint/Ubuntu/Debian apt how to downgrade a package


    First of all check to see which version if any you have available for a downgrade: apt-cache showpkg packagename Downgrade/Install old package: apt-get install package=version Example apt-cache showpkg caja Package: caja Versions: 1.10.3-1+rafaela (/var/lib/apt/lists/packages.linuxmint.com_dists_rafaela_import_binary-amd64_Packages) (/var/........
  • Ubuntu Linux Mint How To Exclude Stop Package from being Upgraded or Installed


    In Debian/Ubuntu this is called "holding". To hold/exclude a package from being installed or upgraded: sudo apt-mark hold packagename To allow the upgrade/installation unhold: sudo apt-mark unhold packagename........
  • Intel NUC Lower Power Green Computing Boxes Review/Comparison of J3160 and J3455 Models


    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........
  • kdenlive titles/text renders as white screen when using .sh script


    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:........
  • /usr/bin/ld: cannot find -lboost_system-mt-s /usr/bin/ld: cannot find -lboost_filesystem-mt-s /usr/bin/ld: cannot find -lboost_program_options-mt-s /usr/bin/ld: cannot find -lboost_thread-mt-s collect2: error: ld returned 1 exit status make: *** [cag


    cagecoin linux compile: sudo apt-get install qt4-qmake libqt4-dev build-essential libboost-dev libboost-system-dev libboost-filesystem-dev libboost-program-options-dev libboost-thread-dev libssl-dev libdb++-dev libminiupnpc-dev Solution: sed -i s/"BOOST_LIB_SUFFIX=-mt-s"/"#BOOST_LIB_SU........
  • Wine uninstalled broken on Linux Mint


    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:........
  • ffmpeg trouble concatenating similar but different files


    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 -........
  • ffmpeg Unable to Use Hardware Encoding with Nvidia 3.40 Driver and GT210 card


    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........
  • ffmpeg Linux Mint download, compile and install howto


    #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 ........
  • Linux how to copy GPT partition table with dd


    The old MBR 512 bytes partition table is no longer valid if you are using GPT. To copy a GPT table with dd to another disk do it like so: Below sda is the source disk and destination disk is sdb (change to meet your needs). dd if=/dev/sda of=/dev/sdb bs=1536 count=1 You can also use dd to backup your partition table like normal but with the bs of 1536 dd........
  • Migrate Centos 7 from Single HDD to mdadm RAID 10 array:


    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! One huge caveat if you are an oldschool user or sysadmin who has avoided UEFIbooting The normal way will not work here if your Centos was using UEFI. Newer systems use it by default. The easiest way to check is to do an fdisk -l if your sy........
  • How to change reserved blocks in Linux partition


    user@box:~$ sudo tune2fs -l /dev/md99 [sudo] password for user: tune2fs 1.42.9 (4-Feb-2014) Filesystem volume name: Last mounted on: /mnt/md50 Filesystem UUID: 976a8655-2619-4587-878c-dab07f7b7652 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Fi........
  • Centos 7 A start job is running for dev-mapper-clx2droot.device (8min 44s / no limit)


    This error is usually because of some sort of encryption in this case a Seagate enclosure with encryption (even though not enabled) did not allow this hard drive to boot.........
  • USB 3.0 External HDD Enclosure Seagate UAS problems - [sdd] tag#1 CDB: Write(16) 8a 00 00 00 00 01 70 04 08 68 00 00 00 08 00 00


    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........
  • Centos 7 Cudaminer Nvidia setup guide


    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........
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    Why won't my Linux Mint boot after I manually installed a new kernel? eg. apt-get install linux-image-newerone Do this dpkg -l|grep linux-image|grep extra ii linux-image-extra-3.16.0-38-generic 3.16.0-38.52~14.04.1&nb........
  • cudaminer freezes Linux Mint taints kernel


    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........
  • Linux Mint Intel Screen Tearing Horizontal Line Solution Fix


    sudo mkdir -p /etc/X11/xorg.conf.d/ sudo vi /etc/X11/xorg.conf.d/20-intel.conf Type "i" and enter the following: Section "Device" Identifier "Intel Graphics" Driver "intel" Option &........
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    **** 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. ****........
  • USB Device/MP3 Player not working properly and can't browse the device filesystem? Check the cable twice and again!


    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........
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    This sounds silly but if you don't know you don't know and the cable name is "RP-SMA" and allows you to extend your wifi antenna as long as the cable goes.........
  • Nvidia Linux Mint/Ubuntu screentearing horizontal line solution


    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........
  • Openshot 2.2 is very unstable always crashing in Linux Mint 18.1!


    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........
  • Track 01: 34 of 1726 MB written (fifo 100%) [buf 99%] 3.6x.Errno: 5 (Input/output error), write_g1 scsi sendcmd: cmd timeout after 1.897 (40) s CDB: 2A 00 00 00 44 A9 00 00 1F 00 resid: 6144 cmd finished after 1.897s timeout 40s write track da


    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........
  • Transaction Check Error: file /usr/lib64/php/modules/fileinfo.so conflicts between attempted installs of php-pecl-fileinfo-1.0.4-2.el6.rf.x86_64 and php-common-5.3.3-49.el6.x86_64 solution


    Transaction Check Error: file /usr/lib64/php/modules/fileinfo.so conflicts between attempted installs of php-pecl-fileinfo-1.0.4-2.el6.rf.x86_64 and php-common-5.3.3-49.el6.x86_64 solution you can't install php-pecl-fileinfo it seems to be incompatble with the php5.3 being installed: yum --exclude=php-pecl-fileinfo --skip-broken --disablerepo=epel install php-*........
  • Linux Mint Install Netboot PXE Guide Howto


    *Update so this doesn't work it must be something to do with the path of nfs or something else but the installer fails with "Installer crashed" at the end whereas with the CD/USB it works. This assumes you've already installed and configured a separate PXE/DHCP server somewhere else and your /tftpboot directory is setup. This is for Linux Mint 18.1 but generally applies to most versions although you may have tro change things like "casper"........
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    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........
  • [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) - Apache Error Solution


    Does this mean? [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) Basically it means you created your SSL Certificate as a CA the wrong way, usually with this command: openssl req -new -x509 -nodes -days 1530 -out server.crt -keyout server.key How can you fix it and do it properly? Step 1.) Make a new Private KeyCreate server pass key:........
  • Windows 2012 Essentials r2 error - "system_thread_exception_not_handled (srv.sys)"


    I'm getting this error randomly but suspect it is an update or application conflict. It also takes ages for this "collection" to happen. "system_thread_exception_not_handled (srv.sys)"........
  • strange vi errors in Linux Mint/Ubuntu line 58: E488: Trailing characters: t_Sbet line 63: E171: Missing :endif


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  • Linux Mint/Ubuntu/Debian Nvidia driver becomes slow graphics performance issue


    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........
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    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........
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    A lot of times these files seem to lag and be incredibly slow even if just a few dozens rows of data. Here is how you can convert it with "gnumeric": ssconvert file.xlsx file.csv You may get lots of weird errors like this but the conversion seems to work fine: (ssconvert:15244): GLib-GObject-WARNING **: g_object_set_valist: object class 'SheetObjectImage' has no property named 'style'........
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    You can actually just pass multiple "-L" statements to achieve this. An example is as below: ssl -L 80:192.168.10.5:80 -L443:192.168.10.5:443 -L2068:192.168.10.5:2068 -L 8192:192.168.10.5:8192 user@remotehost.com The above essentially is saying forward ports 80,443,2068,8192 to the remote IPof 192.168.10.5 (even though it is behind NAT). Essentially SSH will do the NAT part even if the........
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    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........
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    The solution is simple this happens if you don't meet the requirements. In my case PHP 5.4 was required but I had PHP 5.3 installed. Once I installed a newer version the install of PHPBB was successful.........
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    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........
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    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........
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    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.........
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    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........
  • Directadmin Install Segfault Error


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    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 ........
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    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)........
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    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........
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  • Openvz Container IP not working suddenly Solution


    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........
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    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........
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    I found this technique listed in many places which shows you how to use a common Linux tool "dd" to dump the raw partition of your iPhone. I give credit to this site for showing me the correct way to dd from the iPhone, I never thought to try it in the other direction:http://log.ijulien.com/post/182804914/iphone-3gs-data-recovery Requirements 1.) Jailbreak your........
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    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........
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    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.........
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    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........
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  • Initializing quota ... Error: Not enough parameters, diskinodes quota not set


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  • Revert to GRUB 0.97/1 instead of GRUB2


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  • mdadm Linux Software RAID QuickStart Guide


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    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. ........
  • VirtualBox OSE/VBOX Can't Access Shared Folder Solution


    I shared a directory on my hostnode/local system (running Ubuntu 10.04) with my Guest system running Windows XP. I have no idea why it's not mentioned or documented in an obvious way, but in the Windows client you just access it with "\Vboxsvr" Once you access that share you'll have access to all of the VBOX shares on your local host. I think it should indicate it somewhere when you enable the sharing. Yes, I'm sure it's buried so........
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  • Shutdown/Power/Halt In Debian/Ubuntu/Centos Guide Systems Doesn't Work


    Different distributions such as Debian and Centos behave differently when trying to shutdown your system. shutdown -H now on Debian does not do what you'd expect. The system won't power down, it will halt and do everything but power down. shutdown -PH now will do the job though (actually power the system off). This is important to test especially if you are not near the system. If you just use -P it forcefully shuts off which is not........
  • OpenVZ/vzctl how to do an on-line migration without downtime


    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:........
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    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........
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    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........
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  • mdadm when a RAID 1 member dies


    [27969.398749] sd 5:0:0:0: [sdb] 3907029168 512-byte hardware sectors (2000399 MB) [27969.398749] sd 5:0:0:0: [sdb] Write Protect is off [27969.398749] sd 5:0:0:0: [sdb] Mode Sense: 00 3a 00 00 [27969.398749] sd 5:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [27972.117543] ata6.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0 [27972.117543] ata6.00: irq_stat 0x48000000 [27972.117543] ata6.00: cmd 60/08:00:ff:7........
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  • Use rcconf to edit startup/init.d/init scripts on Debian/Ubuntu based distributions


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  • cPanel complaint - No Shared SSL! cPanel 11.25.0-R46156 - WHM 11.25.0 - X 3.9


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  • Linux Centos/RHEL can't find php/apache/httpd/mysql/ftp/exim/sendmail ?


    I wasted a lot of time wondering why I could never find those packages. Check the /etc/yum.conf file and at the bottom look for the "exclude=" line. Below is what I found in mine exclude=apache* httpd* mod_* mysql* MySQL* da_* *ftp* exim* sendmail* php* bind-chroot* Just remove those entries or uncomment that line and you'll get access to the missing applications.........
  • How To Set DHCP/Static IP Address in Centos/RHEL/Fedora & Debian/Ubuntu/Kubuntu/MEPIS Set DHCP/Static IP Address


    Basically the two main types of distros are Debian and RHEL/Centos based. I'm just going to give a quick overview of how the configuration of IP interfaces works in Debian/Centos based distros. *Just one thing to remember, when setting IPs statically you have to manually specify a DNS server in /etc/resolv.conf (since DHCP is what normally does it automatically) Debian/Ubuntu/Kubuntu/MEPIS The IP (DHCP &........
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  • Great way to backup/clone/dd your Linux partitions


    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.........
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  • Debian 5.04 RAID 1 mdadm boot problem GRUB error


    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........
  • Centos 5.5 RAID 1 boot issue


    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........
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    This function and others may not work with the stock PHPinstall on Centos/CPanel: Fatal error: Call to > undefined function imagecreatefromjpeg() Even with libjpeg-devel installed it won't work because PHP was not compiled with jpeg support, so we have to do the dirty work ourselves :) Here is the command/yum's I did to install missing libraries for PHP that configure will complain about (yes it is a one by one process). yum install bzip2-........
  • Unixbench Score on Core i5 750 with OpenVZ Kernel vs Xen/Openvz


    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........
  • WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The f


    @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The fingerprint for the RSA key sent by th........
  • chroot into an off-line Linux version using a LiveCD/USB


    It's not just as simple as running the chroot command, you need to ensure the /proc and /dev entries are passed through and populated to the chroot environment. Step 1 - Mount Your Off-lineOS mount /dev/sda1 /mnt Step 2 - Mount Proc mount -t proc none /mnt/proc Step 3 - Mount Dev Most guides will tell you to use this: mount -o bind /dev /mnt//dev but that doesn't work for some reason in many cases: mount: wron........
  • OpenVZ user_beancounters kmemsize failcnt Processes Timing Out/Doing Nothing/Zombie


    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........
  • CPanel OpenVZ VPS Error - *** Notice *** No working loopback device files found. Try running `modprobe loop` as root via ssh and running this script again.


    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


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  • Windows install blue screen of death caused by faulty optical/DVD-RW drive.


    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........
  • SSH Automatic/Passwordless Logon - Setup Public Key Encryption In Single Command


    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........
  • Choose Which GCC Version to compile with via CC environment variable.


    It's very common to have multiple GCC versions for different reasons, as annoying as it is. Some newer/older programs only compile properly or at all on specific versions. You can export the following variable CC: export CC=gcc-4.1 Replace gcc-4.1 with the filename of the gcc you want eg. gcc-99........
  • Asus Eee PC 1000HE Crashed/Need To Recover/Restore Windows? Easy Solution is Hitting F9


    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........
  • Linux 2.6.33.3 Kernel Error 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 b


    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........
  • mdadm Linux Software RAID auto-detect and assemble RAID Array


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    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........
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    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........
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    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':........
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    I have played around with Pound a little bit. It is a reverse proxy and load balancer in one, and it can be used as only a reverse proxy if you like. It is very simple to configure as either, and Pound even senses if one of the systems is down and stops sending requests to the dead server. It supports SSL (but passes the request to the destination server unencrypted) and even the Apache log format. Pound is very simple, fast a........
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    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........
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    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........
  • Create/Enable SSL Certificates for Apache on Linux/Unix Systems eg. Redhat,Centos,Debian


    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........
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    This happened with a select statement which writes the result to an external file. I didn't remember the privilege "FILE" must be granted on *.* for this to work successfully, it wasn't actually an authentication issue as it implies since I was already in the SQL prompt and doing the query. SELECT some_id FROM sometable INTO OUTFILE '/tmp/result.txt'........
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    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........
  • How to Track Down/Find Cause of Linux high disk iowait/wa


    top - 09:34:12 up 2 days, 20:57, 2 users, load average: 1.83, 1.99, 2.03 Tasks: 59 total, 2 running, 57 sleeping, 0 stopped, 0 zombie Cpu(s): 0.3%us, 0.0%sy, 0.0%ni, 0.0%id, 99.7%wa, 0.0%hi, 0.0%si, 0.0%st That 99.7% wa is iowait, it means the server is waiting for a process to complete an IOoperation or in plain English, there is a delay in........
  • Windows Vista sysprep.exe /generalize error "The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed. To install Windows, click "OK" to restart the computer, and then restart the installation."


    I wanted to disable the "Administrator" account for security purposes and Iread some "guide" on the internet that recommended that we run "C:WindowsSystem32sysprepsysprep.exe /generalize". I also clicked the option for "Generalize" and the computer rebooted and gave some OOBE error and restarted, and now I get the error above no matter what. I read that some drivers such as ones from AVIRA AV can cause this because they're unsign........
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    I didn't find any useful information that actually fixed this. My VPS was in the "Running State" and I could not stop or restart it. I kept getting "Container already locked" no matter what Idid (I tried all the suggestions in the Google results for this error). Most of the suggestions were for Windows but I only use Linux. The other solutioins also said to restart the VZ service or even the entire hostnode and this was not acceptable to me........
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    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........
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    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........
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    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........
  • Unixbench Score with Glusterfs/Openvz & Quad Core Xeon - Updated with GlusterFS 2.0.8


    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........
  • yum error not working rpmdb: mmap: No such device TypeError: rpmdb open failed


    Loaded plugins: fastestmirror rpmdb: mmap: No such device error: db4 error(19) from dbenv->open: No such device error: cannot open Packages index using db3 - No such device (19) error: cannot open Packages database in /var/lib/rpm 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&qu........
  • Tyan S2735-8M Maximum Hard Drive Limit/Not Working/Doesn't work with 1TB 1000GB hard drives


    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.........
  • Tyan S2735-8M motherboard/Rackable Systems 1u Server 100mbit NIC not working even when enabled in the BIOS


    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........
  • Unixbench Score with Glusterfs/Openvz & Quad Core Xeon


    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........
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    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........
  • Have an OpenVZ VPS/Linux Virtual Private Server and nothing works right?


    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........
  • MySQL Restoring And Dumping/Backing UP MySQL Data/Tables/Databases


    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........
  • Bash Script/Linux/Unix HTML/XML Parser


    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.........
  • Fake PR Pagerank Identification - How do you know/check/verify the real PR(Pagerank)?


    Here is an example that I recently found, most PR checkers will say this domain is PR8 or will say "cannot analyze PR". The example is domain "bonserotica.com" view Google's cache of the homepage and you'll see as in the picture below, it lists a different URL, which means they used a redirect to a high PR site to fool you and the PR checkers.........
  • iPhone Complaint Lock/Standby Disrupts WiFi and uses 3G instead


    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........
  • How to solve the iPhone 15 minute POP/IMAP checking delay option with virtual push


    You need to jailbreak your phone and inside Cydia you'll find "PushMod" which will allow you to set your mail check time to 1 minute instead of 15-minutes. This is a great mod and has saved me a lot of stress and frustration, the lack of Blackberry style "free push service" makes iPhone less attractive, but this solves that. Apple needs to make mobileme free and have a Blackberry style chat network to compete, I'm not willing to pay for something Blackberry........
  • Why Apple should thank the jailbreakers and not patch/stop the jailbreaking exploits


    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........
  • iPhone Backgrounder Adds True and Real iPhone multitasking on jailbroken phones


    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........
  • iPhone 3GS Jailbreak Information & Benefits


    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........
  • iPhone 3GS 32GB "Harsh Review"


    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........
  • iPhone Safari Browser and TinyMCE Support


    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........
  • Weird characters in Linux putty shell


    Iused to get all kinds of weird annoying characters like "" during compilation with gcc especially. example: dmg2img.c:456: error: BZ_OK undeclared (first use in this function) dmg2img.c:471: warning: implicit declaration of function BZ2_bzCompressEnd dmg2img.c:482: warning: implicit declaration of function BZ2_bzDecompress dmg2img.c:484: error: BZ_PARAM_ERROR undecl........
  • Using a Mac OSX DMG Image in Windows and Converting to Standard ISO Format use dmg2iso


    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........
  • Apple iPhone 3GS and predecessors are leading a revolution


    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........
  • Nokia N97 review, feedback and complaints


    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........
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    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........
  • SSH Slow Login even with SSHD UseDNS no parameter


    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


    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.........
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    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........
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    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 ........
  • Configuring OCFS2 Clustered File System on Debian Based Linux including Ubuntu and Kubuntu


    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........
  • Viewing and Connecting to an SMB Samba Share on Windows/Linux/Unix


    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........
  • 1U Servers are Loud - We Have The Quiet Solution


    I've read a lot of people complaining that their 1U servers are too loud for the office, home or whatever strange places people might want to put them. Whenever Isee the question asked, "what can be done about the noise", you'll see a myriad of silly answers like "you shouldn't have it at home or in your office at all", "1U servers are meant to be loud". These all might be valid points but they're not the solution. A good example is a........
  • Rackable Systems and their Microslice Clustered 1U Servers


    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........
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  • Writing/Burning a data CD-R/DVD-R or DVD+RW in Unix/Linux


    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........
  • Comments About Networking Technology


    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.........
  • Welcome to realtechtalk.com


    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.........
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