Wednesday, November 11, 2009

How To Add An IP Address from SSH

cd /etc/sysconfig/network-scripts

In this directory, you will find some files that begin with “ifcfg-”. There will be one file for each of your physical network adapters and one file for each of your virtual adapters. In my case, the existing script files are:

  • ifcfg-lo => this is the loopback interface
  • ifcfg-venet0 => this is my one and only physical adapter
  • ifcfg-venet0:0 => virtual adapter #1
  • ifcfg-venet0:1 => virtual adapter #2
  • ifcfg-venet0:2 => virtual adapter #3
  • ifcfg-venet0:3 => virtual adapter #4

So now what you need to do is to either copy an existing configuration file (if you have one of course) or create a new one. The new configuration file name must include the number of the virtual adapter. So supposing you want to add a fifth IP address from an existing script, you would issue:

# cp ifcfg-venet0:3 ifcfg-venet0:4

Next you will need to edit this file so that it contains your new IP address. You can use “vi” to do so.


Now you’ve got a new IP address and cPanel is running fine but there’s one more step to go.

Although you’ve added a new IP address at the operating system level, you now have to make it available for cPanel. Log in WHM as root ( and click on Add a new IP address from the IP Functions menu.

Now simply enter the new IP address with the subnet mask and hit the “Submit” button.

So that’s it! You’ve now got an additionnal IP address available for your web server.


Of course you’ll have to change for your new IP. Save the file when you’re done.

To activate the new virtual adapter, issue this command:

# /etc/init.d/network restart

To make sure your new virtual adapter has been activated, use the “ifconfig” command. You should see the new adapter configuration details at the end.

At this point, the new IP address should be working but now cPanel will be deactivated. To re-activate it, simply issue this command:


Saturday, November 7, 2009

ip_conntrack table full, dropping packet error

If you are getting error
kernel: ip_conntrack: CT 87726*: table full, dropping packet.

Generally, the ip_conntrack_max is set to the total MB of RAM installed multiplied by 16.

You need to increase

# echo 37072 > /proc/sys/net/ipv4/ip_conntrack_max
This will increase ip_conntrack number to 37072

Command to check the current count
# cat /proc/sys/net/ipv4/ip_conntrack_max

To make this persistent you have to add a line like
‘net.ipv4.ip_conntrack_max=37072′ to /etc/sysctl.conf


Thursday, November 5, 2009

How to increase quotaugidlimit in a vps from NODE

# vzctl set 100 --save --quotaugidlimit 1000

101 will be your VPS ID

To apply changes it is required to restart VE:
# vzctl restart 100


Tuesday, November 3, 2009

Install YUM from VZ Node

Run this command from node
#vzpkg install VEID -p yum

VEID will be your VPS ID.


Monday, November 2, 2009

Features of Apache 2.2

Please check

Install mod_xsendfile

mod_xsendfile is a small Apache2 module that processes X-SENDFILE headers registered by the original output handler.

If it encounters the presence of such header it will discard all output and send the file specified by that header instead using Apache internals including all optimizations like caching-headers and sendfile or mmap if configured.

It is useful for processing script-output of e.g. php, perl or any cgi.

Download from source


Compile and install

apxs -cia mod_xsendfile.c

Restart apache

Works in apache2.2



Sunday, November 1, 2009

SSHD Failed

If you are getting error while starting ssh

sshd dead but subsys locked

Do the following

remove /dev/null
and then: "mknod /dev/null c 1 3"

this will create the /dev/null and sshd should start as normal.


GeoIP installation for Linux

Download the current GeoLite Country, GeoLite City and Organization (AS Numbers) databases


Create GeoIP data directory if it doesn't already exist

if [ ! -d /usr/local/share/GeoIP ] ; then
mkdir /usr/local/share/GeoIP

Move data files to directory and unzip.

mv GeoIP.dat.gz /usr/local/share/GeoIP/
gunzip /usr/local/share/GeoIP/GeoIP.dat.gz

mv GeoLiteCity.dat.gz /usr/local/share/GeoIP/
gunzip /usr/local/share/GeoIP/GeoLiteCity.dat.gz

mv GeoIPASNum.dat.gz /usr/local/share/GeoIP/

Install the GeoIP program.

There are two options:

  1. Install a C program and a Perl program
  2. Install just a Perl program.

Option a) will provide the fastest performance.

The instructions for a) are known to work using Fedora Core 6 - FC6.

  1. Install GeoIP C API

Download the GeoIP-*.tar.gz file, uncompress it and compile.

tar -xvzf GeoIP-1.4.5.tar.gz
cd GeoIP-1.4.5

make check

2007-10-10: Thanks to James Rice who notified us of version 1.4.3. 2007-02-21: Thanks to Daniel Wallace who notified us of version 1.4.2. 2007-01-13: Thanks to Daniel Wallace who notified us of version 1.4.1. 2006-09-25: Thanks to Oleg Nerus who notified us of version 1.4.0. 2006-05-21: Thanks to Florian Burka who notified us of the availability of version 1.3.17.

With a text editor, add the directory was installed in, i.e. /usr/local/lib, to /etc/, and execute ldconfig

  1. Install Geo::IP Perl Module

Download the Geo-IP-*.tar.gz file, uncompress it and compile.


tar -xvzf Geo-IP-1.35.tar.gz
cd Geo-IP-1.35

perl Makefile.PL LIBS='-L/usr/local/lib'
make test

Option b) (in lieu of option a!)

PurePerl Module (is slower, but does not require C library). Download latest Geo-IP-PurePerl-*.tar.gz file, uncompress and compile. Replace the version below with the current version.

wget tar -xvzf Geo-IP-PurePerl-1.17.tar.gz -C /usr/local/src/ cd /usr/local/src/Geo-IP-PurePerl-1.17 perl Makefile.PL make make test make install

Update your awstats.mysite.conf configuration file

Look for the following geoip LoadPlugin options in your AWStats configuration file. Update them with the full path to each of the two database files.

LoadPlugin="geoip GEOIP_STANDARD /usr/local/share/GeoIP/GeoIP.dat"
LoadPlugin="geoip_city_maxmind GEOIP_STANDARD /usr/local/share/GeoIP/GeoLiteCity.dat"

LoadPlugin="geoip_org_maxmind GEOIP_STANDARD /usr/local/share/GeoIP/GeoIPASNum.dat"

sudo make install

sudo make install

gunzip /usr/local/share/GeoIP/GeoIPASNum.dat.gz

Source : Antezeta

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