Wired Gorilla » wiredgorilla

WHM – How To change NameServer Ip

wiredgorilla — Fri, 13 Jan 2012 22:31:45 +0000

The file that actually handles WHM > DNS Functions > Nameserver IPs area is at /var/cpanel/nameserverips.yaml location.

If you want this to be changed, you’d want to make a backup of that file first and then modify it:

cd /var/cpanel
cp nameserverips.yaml nameserverips.yaml.bak110112
vi nameserverips.yaml

Linux VPS speed test

wiredgorilla — Thu, 06 Oct 2011 11:24:55 +0000

Need to test the read and write speed of your VPS , checking your I/O speed ?

try this :

dd if=/dev/zero of=test bs=64k count=512 oflag=dsync

Classic Nintendo CEO statement

wiredgorilla — Wed, 03 Aug 2011 04:20:57 +0000

Video games don’t affect kids. If Pacman had affected us as kids , we’d all be running around in darkened rooms , munching magic pills and listening to repetitive electronic music!

How to change the hostname in Linux

wiredgorilla — Fri, 15 Jul 2011 15:54:20 +0000

If you are new to linux you probably will wonder how to change the hostname of your computer or server. (A hostname is the unique name by which a network attached device is known on a network.) If you enter the wrong hostname during the installation, and you need to change the hostname, here is the solution:-

Edit file /etc/sysconfig/network using your favourite editor. In my case is nano. So i’ll enter nano /etc/sysconfig/network
Look for HOSTNAME=xxxxxx
Change the xxxx to the name you wish to set for your computer. (ex: HOSTNAME=wiredgorilla.com)
Save the file and restart the xinetd service. (ex: type service xinetd restart in your shell)
Done! You have just changed your hostname in Linux platform

iOS 4.3.3: Install, Unthethered Jailbreak, Unlock with Sn0wbreeze

wiredgorilla — Sun, 19 Jun 2011 07:36:39 +0000

This is a step-by-step guide to Install, Jailbreak and unlock iPhone 4.3.3. You may choose to jailbreak iPod Touch, iPad with the same method except leaving the options that are only available to locked iPhones. You should jailbreak factory unlocked iPhone with Redsn0w

Step 1: Collecting essentials

1.1] Select and Download required 4.3.3 OS stock firmware file from this download page . [If you're on iPhone 3GS then you should choose 'iPhone 3G S (4.3.3/8J2)']

1.2] Download & install Sn0wbreeze 2.7 from this page

* Sn0wbreeze requires .NET Framework installed on Windows computer.

1.3] Download and install iTunes 10.2.2 (This is a must because it supports 4.3.3)

1.4] Take backup of iPhone data with iTunes.

1.5] If you have a jailbroken phone & Cydia apps installed on it then use AptBackup package from Cydia to backup application list.

See the whole tutorials here

Plesk Login prompt error

wiredgorilla — Sun, 05 Jun 2011 05:44:10 +0000

Plesk Login prompt Issue

A strange login prompt is presented when trying to view a website on a windows plesk account , even though the website directory is not password protected.

The Fix:
This issue results from the anonymous account password used to deliver the site to public web viewers , getting out of sync with the main account password. To fix, just re sync anonymous password by issuing the following command in the run dialog:

"%plesk_bin%\websrvmng.exe " --update-anon-password --domain-name=yourdomain.com

Excluding Packages from Yum Update

wiredgorilla — Mon, 09 May 2011 02:00:47 +0000

When running a ‘yum update’ under CentOS, there are certain packages you may be running which you wish to remain static, or which can potentially cause errors with the update eg. Samba.

In these situations it is useful to force yum to exclude certain packages from being updated under CentOS.

Yum uses a configuration file located at <strong>/etc/yum/yum.conf or /etc/yum.conf

If you wish to exclude packages you need to define a list for exclusion from updates or installs. This should be a space separated list. (Shell globs using wildcards * and ?) are allowed).

How do I exclude php and kernel packages when I use “yum update”?

Open /etc/yum.conf file:
# vi /etc/yum.conf

Append following line under [main] section, enter:

exclude=php* kernel*

At the end, it should look like as follows:

[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
exclude=php* kernel*

# Note: yum-RHN-plugin doesn’t honor this.
metadata_expire=1h

# Default.
# installonly_limit = 3

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
yum –exclude command line option

Finally, you can skip yum command updates on command line itself using following syntax:

# yum –exclude=package* update
# yum –exclude=php* update
# yum –exclude=kernel* update

Fix corrupted RPM database on CentOS 5

wiredgorilla — Thu, 05 May 2011 14:42:50 +0000

If rpm / yum command hangs during operations or you see error messages – it means your rpm database corrupted. /var/lib/rpm/ stores rpm database just delete the same and rebuild rpm database:

Command to rebuild rpm database

rm -f /var/lib/rpm/__db* rpm --rebuilddb -v -v

cPanel transfer restore error

wiredgorilla — Thu, 05 May 2011 14:40:53 +0000

Forcing the restore of a transfered cPanel account , even if the new system says the username is all ready in use

/scripts/restorepkg –force –skipres

How to install CPAN libwww-perl

wiredgorilla — Mon, 02 May 2011 08:59:34 +0000

When installing the CSF firewall on your CentOS server, you need to make sure that you have libwww-perl installed

This is easily done by installed it with yum on CentOS 5

yum install perl-libwww-perl

How to remove Tomcat on cPanel

wiredgorilla — Thu, 23 Dec 2010 13:31:53 +0000

Want to remove Tomcat from cPanel?

Log-into your server as root using ssh:

Execute the following command to stop the Tomcat process:
# /usr/sbin/stoptomcat

…and to remove the next files, enter:
# rm -f /usr/sbin/starttomcat
# rm -f /usr/sbin/startomcat
# rm -f /usr/sbin/stoptomcat

Finally, remove all mod_jk lines from httpd.conf, including addmodule, loadmodule, and include lines.

Apache logs

wiredgorilla — Sun, 14 Nov 2010 09:16:32 +0000

Issues with suhosin or mod_security , then best check your Apache error logs

tail -f /usr/local/apache/logs/error_log

Virtuozzo: Fixing Windows VPS Container Start Errors

wiredgorilla — Wed, 24 Mar 2010 01:53:49 +0000

Due to the way the Virtuozzo virtualization platform works, all VPS containers are linked to the Host Node Operating System. For this reason, Windows updates are specifically disabled in Virtuozzo VPS Containers as any changes or updates to Windows System Files or Drivers, that differ from the host node can render the VPS Container unusable – All Windows Updates must be approved by SWSoft/Parallels and offered as Virtuozzo updates, which have to be applied on the Host Node.

Unfortunately, some users not familiar with Virtuozzo will often attempt to manually override the disabled Windows Update options, for example by downloading and manually installing Windows Updates. All will be fine until a container restart is attempted which will fail with the following errors or something similar:

Failed to start Virtual Private Server ’21656′. System error 1:
Virtuozzo API function call ‘VzkrnlStartVps’ failed dwErr = 0x000004FB

This generally means the VPS was updated using Windows update, as above – with Virtuozzo you can only install approved patches from SWSoft/Parallels (http://www.parallels.com)

In order to fix this, the easiest method would be to restore a recent VPS Container backup. However, this may not always be an option with users either having no backups, or backups which are out of date.

In order to begin fixing this, we will need to resynchronize the problem Container’s system files with that of the Host Node Operating System. If these file differs from the Host Node, the VPS Container simply cannot start ie. Copying the “c:\Windows\System32\drivers\” folder.

To do this you must log into the Virtuozzo Host Node via RDP, open a command prompt, and perform the following, which simply replaces what was patched/replaced with what the Host Node is using:

copy c:\WINDOWS\system32\drivers\ c:\vz\privte\VEID\root\c\WINDOWS\system32\drivers\

Where “VEID” is the VPS Container ID.

Now, because the VPS Container is down, Virtuozzo will most likely have unmounted the root file system for this container. Which means you will have to temporarily mount the file system in order to make changes to the file system, which you can perform with the following steps:

1) Make sure the container is stopped

vzctl stop VEID

You may also wish to backup the containers file system at this point eg. Do copy of z:\vz\private\VEID\root.efd for emergency cases.

2) a) Mount the root.efd file

vzdskctl mount z:\vz\private\VEID\root.efd GUID – making sure the root.efd path is correct for this container.

2) b) To obtain the container’s unique GUID required above:

vzcfgt get VEID GUID

This will return the unique GUID in the form “{799251BE-720C-468E-B877-913F49476001}”

3) Once the vzdskctl mount command returns “SUCCESS”, the file system for the container is mounted and you can copy the Windows System files over.

4) Once you’ve finished copying:

vzdskctl umount GUID

This will unmount the file system, so you can attempt to start the container again. However, you may also want to assimilate the VPS Container by running the following command from the Virtuozzo BIN folder (usually C:\Program Files\SWsoft\Virtuozzo\BIN):

vzfsctl assimilate VEID

Now to restart the container either via PIM or command line

vzctl start VE

Unsuspend Plesk Domain Accounts

wiredgorilla — Mon, 22 Feb 2010 23:09:10 +0000

Occasionally Plesk can be a little temperamental and suspend accounts over expired validity errors. Attempting to “unsuspend” the account from your Plesk control panel will generally fail, and you will need to activate the domain by force using the command line.

In Windows, goto Start -> Run and cd to your Plesk “bin” folder – typically c:\Program Files\Parallels\Plesk\admin\bin

Then type the following:

domain.exe –on yourdomain.com

This can take a little while but you should see “SUCCESS, status of domain changed”, and the domain will again appear as “Active” from your Plesk Control Panel.

Rebuilding/Restarting Exim Mail Server

wiredgorilla — Wed, 17 Feb 2010 01:24:53 +0000

When troubleshooting the Exim log file:

tail -f /var/log/exim_mainlog

If you need to restart or rebuild Exim, you can dump your databases
* /etc/exim.conf
* /var/spool/exim/db

Which Exim just rebuilds automatically by issuing the following command via SSH:

rm -fv /var/spool/exim/db/*

Then to start Exim:

/scripts/eximup –force

cPanel Server : Restoring MySQL SimLink.

wiredgorilla — Tue, 16 Feb 2010 07:08:04 +0000

If you’re unable to restart mysqld and troubleshooting the cause: if u log into SSH and go to /tmp you may see that there is no simlink

To create a simlink you can do the following:

cd /var/lib/mysql/
touch mysql.sock
chmod 1777 mysql.sock
chown mysql.mysql mysql.sock

Create a symlink for the sock file :-
ln -s /var/lib/mysql/mysql.sock /tmp

Restart mysql :- service mysql restart

Then your MySQL service should be back to normal.

Linux server tip: force reboot/shutdown

wiredgorilla — Wed, 22 Apr 2009 15:31:05 +0000

Forcing reboot

A Linux Server is not Windows XP and if reboot fail you usually still connect by SSH and do something. This commands will show you how to remotely hard reboot machine. Hard reboot mean that shutdown scripts will not run and machine reboot immediately without syncing hard disk drives, shutdown applications etc, it’s more like hitting the reset button.

echo 1 > /proc/sys/kernel/sysrq

echo b > /proc/sysrq-trigger

This commands enable sysrq and after this calls fast reboot. If you want to force shutdown machine try this.

Force shutdown

echo 1 > /proc/sys/kernel/sysrq

echo o > /proc/sysrq-trigger

This came handy, when I had a server that had some IO error and it can no longer read from disk, only few cached binaries into memory kept it running (kernel, SSHD, bash), I could still access the machine via SSH but can no longer do anything, forcing the reboot as mentioned above was my only resort, and it worked like charm…

How To Set Up A Load-Balanced MySQL Cluster With MySQL 5.1

wiredgorilla — Sat, 18 Apr 2009 01:05:47 +0000

This tutorial is based on Falko Timme’s tutorial for MySQL Cluster 5.0. It shows how to configure a MySQL 5.1 cluster with five nodes: 1 x management, 2 x storage nodes and 2 x balancer nodes. This cluster is load-balanced by an Ultra Monkey package which provides heartbeat (for checking if the other node is still alive) and ldirectord (to split up the requests to the nodes of the MySQL cluster).

In this document I use Debian Etch 4.0 for all nodes. Therefore the setup might differ a bit for other distributions. The two data nodes were x64 to use all of the 8GB RAM. Servers were compiled from source so you should be able to make it running on any platform. The MySQL version I use in this setup is 5.1.24-rc. It’s a release candidate, but I wanted to use 5.1 to take advantage of Memory-Disk Based tables.

Beginning with MySQL 5.1.6, it is possible to store the non-indexed columns of NDB tables on disk, rather than in RAM as with previous versions of MySQL Cluster.[More here]

This howto is just a scratch to make it running, for many of you I am suggesting to read some off docs from MySQL page to be prepared to how manage the whole cluster and always know whats going on.

This document comes without warranty of any kind! Bare in mind you need to make tests and prepare your databases before using it in production mode.

http://www.howtoforge.com/setting-up-a-loadbalanced-mysql-cluster-with-mysql5.1

How to update Virtuozzo Node to the newest Kernel

wiredgorilla — Sun, 05 Apr 2009 13:38:57 +0000

Virtuozzo includes a utility to update itself and the included templates. To run this, you will need to ssh into the hardware node and execute the command:

vzup2date

In order to update the templates, add a -t to the command thusly:

vzup2date -t

It should be noted that if Virtuozzo is installed on the server, the standard Redhat up2date command should never be run.

If you are running Virtuozzo on a Windows server, then you can run the Virtuozzo update utility accessed through the Start menu.

E-mail Alert on Root SSH Login

wiredgorilla — Fri, 27 Mar 2009 12:18:57 +0000

Want to be notified instantly when someone logs into your server as root?

No problem, check out this nice tutorial on email notification for root logins. Keeping track of who logs into your server and when is very important, especially when you’re dealing with the super user account. We recommend that you use an email address not hosted on the server your sending the alert from

1. Login to your server and su to root, I know the irony!

2. cd /root

3. pico .bashrc

4. Scroll to the end of the file then add the following:
echo ‘ALERT – Root Shell Access (YourserverName) on:’ `date` `who` | mail -s “Alert: Root Access from `who | cut -d”(” -f2 | cut -d”)” -f1`” you@yourdomain.com

Replace YourServerName with the handle for your actual server
Replace you@yourdomain.com with your actual email address

5. Crtl + X then Y

Now logout of SSH, close the connection?and log back in! You should receive an email address of the root login alert a few minutes afterwards.

Note: This is a great tool for servers that have multiple admins or if you give someone SSH access for whatever reason, although you should give out the root password to as few people as humanly possible and be sure to change it often.

This will not magically alert you when a hacker runs the latest kernel exploit on your server and logs into SSH because they will create their own SSH/telnet connection. You should keep your system up to date, install a firewall and follow the latest security releases.