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.........
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:
list-units [PATTERN...] List loaded units
A quick check in /dev/pts shows a lot of entries but what are they for?:
0 10 12 14 16 18 2 21 23 25 27 29 30 32 4 6 8 ptmx
1 11 13 15 17 19 20 22 24 26 28 3 31 33 5 7 9
Basically they are pseudo-termi........
It could just be my specific Java but other KVM/IP works ok on my machine but with Supermicro's IPMI for some reason the console window doesn't resize and even putting it in full screen leaves the window cut off as shown below:
As you can see above the screen is cut off you can't see the "Iagree" on the right side.
The window resi........
BootModuleConfig.sh echo host-ind nfcd........
[root@thetor2017 conf]# service httpd restart
Stopping httpd: [ OK ]
Starting httpd: WARNING: MaxClients of 3000 exceeds ServerLimit value of 300 servers,
lowering MaxClients to 300. To increase........
We all know Linux is known for good memory management but is it really? It seems all on its own with hardly anything running that you can come back in days or weeks and find that almost all of your RAMis used!
And many will say "no don't worry it's buffers for optimization" but it doesn't seem to help because what is in buffers is not available to use for new programs running or ones that allocate more RAM as far as Ican tell.
The reason Iknow........
You can search for this bug and it seems like it may be related to ecryptfs and is many years old.
The symptoms are that you return to the computer and the screensaver was active or the screen was asleep/black and it doesn't seem to come back. But you check by SSH the computer is running fine and are frustrated you'll lose your running programs and have to reboot.
There is a simple solution:
Ctrl + Alt + F1
Ctrl +Alt + F8
#mount the VCSA DVD
mount /dev/sr0 /mnt/cd
#alternatively you could mount the iso directly
mount -o loop vcsa.iso /your/mount/path
#for this purpose we are using the CLI installer on Linux
#no it's not going to be that easy you can't just run vcsa-deploy like that you need to use a template or configured .json file
Usage: vcsa-deploy [-h] [--version] [--supported-deploymen........
A simple way that may work for a lot of people who just need basic output for their scripts or daemons to announce an action is this:
echo "body or message" | mail -s "realtechtalk.com" firstname.lastname@example.org
If you want to send a text file as the body just do this instead:
mail -s "realtechtalk.com" email@example.com < /tmp/sometxtfile.txt
These are some ve........
Sometimes if you have a very basic configuration OpenVPN on the client side for some reason sends all traffic to the OpenVPN server IP through the tun0 which is of course impossible and creates a block or routing loop.
This is because you need to use your normal ISP/LANgateway to hit the OpenVPN server if it is remote/offsite as is usually the case. So if you are connected to the OpenVPN through say a tun0 device and your routing is set to connect to the OpenVPN&nbs........
This is one thing that has me wondering about SMF. It is apparently a known issue but in the latest version and new install nothing looked right because it was using http://127.0.0.1 to find everything! How on earth would it ever do this or think it is normal?
Excerpt of crazy html code it produces that causes the issue:
It's fairly simple to start or stop a check but I do wish mdadm's command had this built in. Sometimes it will do a check at the worst time causing the server to crawl to a halt.
Stop check on md126:
echo idle > /sys/block/md126/md/sync_action
Start check on md126:
echo check > /sys/block/md126/md/sync_action
vzquota : (error) Quota on syscall for id 4532: No such file or directory
vzquota on failed 
vzquota drop 4532
Then start the container and it should work. It actually happened after migrating the VPS manually to ano........
It has been a big pain for a long-time to install Windows from a Linux environment. I used to run a windows install server and it never worked right for some reason (the install would fail on most servers).
Before getting start be sure to setup your samba share so once you boot into WinPE you can mount the install for whatever Windows you want
path = /tftpboot/images/winstall
guest ok = yes........
ALTER TABLE existingtable ADD newfieldname VARCHAR(255);........
ALTER TABLE thetable ADD newfield VARCHAR(255)
It's very simple just specify "the table" and then the newfield type........
You are using Centos 5 which is deprecated so nothing in yum will work until you follow this post to use the vault:
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* epel: fedora-archive.ip-connect.vn.ua
It is not obvious but the rsync --help
rsync --help|grep port
--port=PORT specify double-colon alternate port number
--port does not do anything at all actually for some strange reason it still uses 22
You have to specify a manual ssh command to make it work:
-e 'ssh -........
#if you have nvidia make sure you install the nvidia-cuda-toolkit so hardware acceleration can be used
tar -jxvf ffmpeg-3.3.2.tar.bz2
install prefix /usr/local
source path ........
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........
sudo mkdir -p /etc/X11/xorg.conf.d/
sudo vi /etc/X11/xorg.conf.d/20-intel.conf
Type "i" and enter the following:
Identifier "Intel Graphics"
If you have this problem: http://realtechtalk.com/mencoder_bmovl_error_vf_bmovl_Unknown_command_Ignoring_-1860-articles
Then ffmpeg is for you. Go here if you are using Linux Mint and cannot find or install it to use an external PPA........
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........
This is especially helpful if you run your own servers. If you are presented with an error message or warning that the signature has changed or does not match the IP/domain you are connecting to you always want to verify manually.
So your e-mail/web client will show you an SHA-1 fingerprint like this:
"Could not verify this certificate because the issuer is unkown" or other reasons such as a mismatch in IP/domain.
It will also show you........
An easy way to pay companies and friends/family since PayPal does not have an option when sending money to make it a subscription:
"business" = The e-mail or PayPal ID of the person/organization to pay to.
a3 The recurring amount "eg. 115" will be 115 USD
p3 The time period (eg. 2)
t3 Unit of time period m=monthly,w=weekly,y=yearly
item_name = "the note/product service reason you are paying ha........
I have two lines on my PAP2T and the only thing that solved this problem rather instantly was to change the line with the problem to using port 5060 instead of 5061 (so both lines are using port 5600). Note that I am not forwarding either port in my router either.
Some of the symptoms of this problem for me were the following:
No dialtone or it would take several tries.
You answer a call but the phone keeps ringing (takes a few times t........
If Linux Mint 17 or other has no window buttons/controls you can do the following from terminal:
Sometimes it can be fixed if you go to your themes/appearance and choose a new one but in the case like mine where Compiz is installed but not running/working then that fix will not work and will require the marco command above.
What if you can't type in a terminal Window?
If you close........
This is a real pain because I had to manually unplug ethernet cables for network testing or to use an alternate network or guarantee physical access to one network segment is cut off.
For some reason this happened after Ikilled dbus because it was confused and blocking packets thinking they were coming from the wrong interface since eth0 and eth1 both had the same subnet and gateway.
I eventually did a "service network-manager restart" but the option was........
Here is the scenario you or a client have a remote machine that was installed as a standard/default minimal Centos 6.x machine on a single disk with LVM for whatever reason. Often many people do not know how to install it to a RAID array so it is common to have this problem and why reinstall if you don't need to? In some cases on a remote system you can't easily reinstall without physical or KVM access.
So in this case you add a second physical or disk or already ha........
Your firefox is out of date if you get errors like below:
Secure Connection Failed
ProCurve J4903A Switch 2824
Software revision I.10.77
Copyright (C) 1991-2009 Hewlett-Packard Co. All Rights Reserved.
RESTRICTED RIGHTS LEGEND
Use, duplication, or disclosure by the Government is subject........
I kept thinking it was esniper but somehow my bash settings have a preset proxy that was creating the issue.
https://signin.ebay.com/ws/eBayISAPI.dll?SignIn: Couldn't connect to server: couldn't connect to host
curl manually to any URL is the same:
curl: (7) couldn't connect to host
Run curl with -vvvvvv mode to see the issue:
curl -vvvvvvvvvv http://realtechtalk.com
* About to c........
It really seems that 4.4.4 is not ready or stable for the i717 yet and this makes sense since it takes a lot of work/development and testing to get the factory stock ROMs working well. In the end I used the 4.1.2 based Blackstra BlackJelly because it was fast, stable and just works and feels great. The aftermarket support is great but many devs are focussed on adding features and customization that most of us don't want or need rather than getting things smooth and stable.........
There is a weird quirk with how this works, but there is a variable called "src" that defaults to 0 or disabled if not specified as 1.
The default 0 means not to recur billing on a subscription. It's too bad it's not more obvious anywhere nor is there an explanation or warning during payment or after to both the seller and buyer.
Here's a proper subscription code example that does recur and does not cancel........
CPanel says you can access 98% of the functions through CLI which experienced Unix/Linux admins prefer for simplicity and for scripting. I've never found CPanel easy to use from the admin panel, it seems everything is hard to find and a simple task becomes a series of hunts.
So for people like me here's the list: http://cpanel.net/system-administrators/command-line-scrip........
Say if you have a form/button like this:
To activate your Windows 2008 server trial which gives you 180 days:
Start ->Right Click (My Computer).
Click "Activate Windows now"
To renew your license for 6 days (can be done 3 times):
Start -> Type this command:
Wait a few minutes until it says it is successful (unless you get that message it has not worked or been done)........
Hit Alt + F10 before the system boots and you'll boot into the recovery drive and be able to restore your system, of course note that all of your data will be wiped out.........
Current Direct stable URL from Fedora: https://fedoraproject.org/wiki/Windows_Virtio_Drivers
Direct Downoad of Stable Virtio: https://fedorap........
I was worried the server was hacked, I was logged in already as root but couldn't login to CPanel or a new SSHsession. I even reset the password from the shell and it did not work still.
The reason is CPanel Hulk, it detected a brute-force attack so it locked down the root account entirely even from the correct password. According to cPanel the best way around this is to whitelist your IP.........
ALTER TABLE yourtable ADD COLUMN info VARCHAR(255)........
user the "--spider"switch and you can see what it would do.
wget -r --spider dontryrealtechtalk.com........
On the same OS with the same kernels basically I cannot boot FreeBSD installer, I believe the issue is the host CPU.
One host runs an Intel and works, while an Opteron 2373 does not work despite suggestions from this thread: http://188.8.131.52/showthread.php?t=36761
I've tried cpu options like "kvm64" "Opteron_G3" and none........
vzquota : (error) Quota on syscall for id 42131: No such file or directory
vzquota on failed 
mv quota.42131 quota.42131-disable
vzctl start 42131
Initializing quota ...
Container is mounted
Adding IP address(es):
Setting CPU units: 1000
Container start in progress...
relay=alt4.gmail-smtp-in.l.google.com. [184.108.40.206], dsn=4.0.0, stat=Deferred: 421-4.7.0 [ 10] Our system has detected an unusual rate of
This is strange because the mail server IP is not blacklisted anywhere and the IP itself has not been used for years and this server is clean and has only sent a few e-mails to gmail.com in its entire time.
I wonder if this is a legacy block on a whole range of IPs as punishment for others in the block........
At first it was configured as a RAID 0, then I deleted the Virtual Disk Group.
I thought both drives would be shown and detected in Linux as sda and sdb but it actually shows nothing.
To make them work you have to hit Ctrl+R before the system boots (when prompted) and create a Virtual Disk Group. In my case I created each one as RAID 0 (with a single drive only) as I just wanted JBOD but there is no such option or default in these Dell Pe........
The error itself "mkdir(): Too Many Links" is not very useful, but I'll translate it into plain English.
It means you've reached the filesystem's limit of how many directories can be created in a single directory.
In this case for ext3 the limit is 32000 and it was exceeded.
What's the solution?
The simple solution is to move those directories into more subdirectories possibly sorting them by date, alphabet or numerically.........
The program itself catches it, just make sure it's actually focused on rdesktop and it sends Ctrl+Alt+Delete to the remote machine and not the local.........
This is useful for developing a lot of applications, I'm putting it here to keep it handy for myself and hopefully others:
Choose CountryCanadaJapanUnited StatesUnited KingdomAfghanistan........
Solution To The Following:
yum -y install zlib-devel
yum -y install e2fsprogs*
*** Cannot find /usr/include/et/com_err.h. (yum install libcom_err-devel) ***
Installation didn't pass, halting install.
Once requirements are met, run the following to continue the install:
Common pre-install commands:
Step #1 - Create Wrapper Script
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
For whatever reason it seems the r8169 driver that ships and has shipped with most Linux distros for years is still flawed and does not work properly on these cards, causing 100mbit connectivity when it should be 1gbit and even worse, causing random network dropouts. The r8169 driver in Linux kernels is simply not meant to be used on th........
cat | grub --device-map=/dev/null
Now pay close to the attention of the beginning.
Type: "device (hd0) VPS.img" this is telling what hd0 will be to GRUB and we're telling it the disk image file "VPS.img" in the current directory is hd0, you can specify alternate paths and image names of course.
GNU GRUB version 0.97 (640K lower / 3072K upper memory)
[ Minimal BASH-li........
mdadm --manage /dev/md1 --add /dev/sdb1
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: /dev/sdb1 not large enough to join array
md1's first primary member /dev/sda3 has 57394 cylinders while the /dev/sdb1 has 57393 (1 less cylinder) which is why it won't work.
fdisk -l /dev/sda3
Disk /dev/sda3: 47........
I'm running Ubuntu 10.10 with Asus NVIDIA GT430
2.6.35-32-generic-pae #65-Ubuntu SMP Tue Jan 24 14:06:16 UTC 2012 i686 GNU/Linux
Nvidia binary driver: 260.19.06
The screen sometimes completely freezes and locks up or everything starts going very slow:
[1903398.100007] NVRM: os_schedule: Attempted to yield the CPU while in atomic or interrupt context
[1903402.373210] NVRM: Xid (0001:00): 53, CMDre 00000000 00000080 00000000 00000005 00........
One of my test Centos 5 containers was on a partition that filled up and it threw all sorts of errors and stopped responding but now I can't boot it again anymore.
All the console shows is the Linux Penguin on the top left corner and the xm console says "usbcore: registered new driver hub" and has halted there.
Centos 5 Xen container stuck/frozen won't boot on "usbcore: registered new driver hub"
Another great way of troubleshooting is booting fro........
Many people aren't aware but recently Dual-Master Replication setups have become increasingly popular. That's because you get similar features and benefits of having a full-blown cluster (difficult to setup and maintain and requires I believe 3 servers just as controllers).
With a dual-master you just have a different off-set for the keys and you should be good, but of course there is the chance that at some point replication will halt because of an unexpected or unforseen error........
That is pinging to the gateway IP on the same switch, the same IP is pingable externally without any problems which makes me think the switch is fine.
64 bytes from 220.127.116.11: icmp_seq=4 ttl=255 time=1.07 ms
64 bytes from 18.104.22.168: icmp_seq=1 ttl=255 time=3536 ms
64 bytes from 22.214.171.124: icmp_seq=2 ttl=255 time=2536 ms
64 bytes from 126.96.36.199: icmp_seq=3 ttl=255 time=1536 ms
64 bytes from 188.8.131.52: icmp_seq=8 ttl=255 time=1.20 ms
I've only used it on Centos, soI thought I'd make a quick Debian guide:
Install the DRBD Package
apt-get install drbd8-utils
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
Use 'apt-get autoremove' to remove them.
yum exits in the middle
The problem is this VPS seems to be an OpenVZ template from HyperVM. The only way to make it work was to disable i386 packages since this was an x64 kernel. That shouldn't be necessary but it was the only way to make yum stop quitting after the first package or two. I couldn't find any issue by checking the logs either.
echo y|yum install vim-minimal telnet expect jwhois net-tools slocate iptables elinks gawk
This happens on some systems due to a video issue with Intel Videocards, after you see the kernel load you may see almost immediately that you get a black screen.
The following kernel parameters usually solve it:
nomodeset i915.modeset=0 xforcevesa
some people just use "nomodeset" and others use "i915.modeset=0". I think nomodeset may also do the same for each video driver so it may imply i915.modeset=0 anyway but I am not sure.........
The most basic is the start menu, which is accessed with Alt+F1........
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........
md: Autodetecting RAID arrays.
md: autorun ...
md: considering sdb1 ...
md: adding sdb1 ...
md: adding sda1 ...
md: created md0
md: kicking non-fresh sda1 from array!
raid1: raid set md0 active with 1 out of 2 mirrors
The md0 raid kicked sda1 ou........
This is obviously a bug in the r8169 kernel module and it seems to affect a lot of people. I upgraded to the latest kernel and hope this won't happen anymore, as it is a very serious error. This is especially serious for those who are running servers with this chipset, who can afford for the NIC to randomly go off-line for no apparent reason?
[655548.189113] type=1505 audit(1277067560.902:5): operation="profile_load" name="/usr/bin/freshclam&q........
I've never understood how to enable and disable services for different run levels in Debian based distros, it's just weird, annoying and doesn't make sense. I much prefer chkconfig from RHEL.
Just install the package called 'rcconf' and be done with it. rcconf makes things easy for you.
apt-get install rcconf
Reading package lists... Done
Building dependency tree
Reading state information... Done........
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)
The IP (DHCP &........
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 firstname.lastname@example.org "echo $key >> ~/.ssh/auth........
Out of memory: kill process 7559 (rsync) score 635 or a child
Killed process 7559 (rsync)
I was surprised to see this in my dmesg whenmy rsync backup suddenly stalled/stopped.
This system has 3 gigs of RAM and lots of free memory so I don't understand what is happening.
rsync invoked oom-killer: gfp_mask=0x200d2, order=0, oomkilladj=0
Pid: 7600, comm: rsync Not tainted 184.108.40.206 #83
I thought there would be an error message or warning from MySQL in the case that the text you submit is greater than the allowed limit based on the field.
So essentially I submitted text that was about 120,000 characters long, whereas the limit of TEXT is just 65,535 characters! I almost lost half of my data/what I typed without knowing it!
I just altered the field type in my database from TEXT to LONGTEXT. I can't see how LONGTEXT wouldn't be long enough for MOST........
The folder I was trying to archive is about 72GB, but much like rsync at about 17GB it chokes because of the filesize. What's with so many common and essential Linux tools having such limitations? I guess it is likely that the authors never wrote their code with the idea that files would be so large but it's still very annoying. It's important to stay on top of these limitations on production servers because I didn't realize what happened until I checked the file with "........
Here are the results, it is Sempron 3000+ AMD Mobile, 500Gig HDD, 512MB RAM with shared ATI Radeon graphics.
# # # # # # # ##### ###### # # #### # #
# # ## # # # #&nb........
Great sound tutorialThis is great if you need users to be able to start/stop playing sound on your page with the click of a button.
http://www.smartwebby.com/Flash/sound_button.aspHere's a simple one except that it doesn't do rollovers.
I actually could not get the rollovers to work using the other tutorial so it is either a mistake on the webmaster's part or........
Changing field names[quote:91ea6831b6]ALTER TABLE [u:91ea6831b6]table_name[/u:91ea6831b6] CHANGE [i:91ea6831b6]existing_field_name[/i:91ea6831b6] [b:91ea6831b6]new_field_name[/b:91ea6831b6] INT(11);[/quote:91ea6831b6]........
REMOVE a field[quote:effdb203d8]ALTER TABLE table_name DROP field_name[/quote:effdb203d8]........
Create Table with structure of another existing tableOk, this has many valid uses such as if you need to create backups or the ability to undo changes, you would want to create new tables with the same structure as another. Here is how you do it.
Also remember Indexes such as PRIMARY KEYS [b:7ed9581493]will not be preserved[/b:7ed9581493] so you will have to readd them manually.[/i:7ed9581493]
[code:1:7ed9581493]CREATE TABLE NewName AS SEL........
ADD PRIMARY KEY to TableHere is an example of readding a PRIMARY KEY with an AUTO_INCREMENT field:
[b:40986c2a8b]First make the field NOT NULL[/b:40986c2a8b]
ALTER TABLE tableName MODIFY FieldNAME INT(18) NOT NULL;
[b:40986c2a8b]Create The Primary Key[/b:40986c2a8b]
[code:1:40986c2a8b]ALTER TABLE tableName ADD CONSTRAINT PRIMARY KEY(FieldName);[/code:1:40986c2a8b........
Basic Port ListingHopefully someone finds this useful or at least interesting.
Name Port Protocol Description
Small services ........
Linux Security Mini-tutorialThis site has a good tutorial to get you started on securing your Linux system. Although I'm sure all of our systems are already 100% secure :lol:
Other Security Web SitesSeveral websites actively track security issues. This list provides you with the major providers
of security information on the Web. Many of these organizations also provide newsletters and
mailings to announce changes or security threats:
Center for Education and Research in Information Assurance and Security (CERIAS)
CERIAS is an industry-sponsored center at Purdue University that is focused on technology and
This way should work on all Linux machines, at least RHEL/Debian (Ubuntu) based distros but most likely all and also should work on many Unix style machines I believe.
Many OS's have tools to update the timezone, but most of them (even if command line) require several bloated packages and even Xorg/KDE based packages etc..
Your time zone info file is actually in /etc/localtime if you open this file in vi/vim/pico you'll see it's gibberish (binary code or another encodin........
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........
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........
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