How do I add additional IP addresses? [CentOS, Ubuntu, Debian]

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CentOS
=========


To add additional IP addresses to your CentOS server you'll need to copy the ifcfg-eth0 or ifcfg-em1 file and rename it to ifcfg-eth0:0 or ifcfg-em1:0. In this tutorial we will use the em1 adapter:
cd /etc/sysconfig/network-scripts
cp ifcfg-em1 ifcfg-em1:0


Once we copied the ifcfg-em1 file and renamed it to ifcfg-em1:0 we can edit the file:
nano ifcfg-em1:0

Edit your file to match this (edit the ADDITIONAL.IP, the gateway and netmask to the details you'll find in the clientarea on the My Services page -> Server or contact support):
DEVICE="em1:0"
BOOTPROTO="static"
GATEWAY="5.200.23.129"

IPADDR="ADDITIONAL.IP"
NETMASK="255.255.255.255"
ONBOOT="yes"
BROADCAST="ADDITIONAL.IP"

Once you edited the file and saved it, you can start the adapter:
ifup em1:0

It can be the connection to your server is discontinued for 5-10 minutes.

If you want to add more IP's, repeat the process above. Rename the the filename to ifcfg-em1:X and set the device name to em1:X.

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Debian and Ubuntu
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To add an additional IP to debian or ubuntu like systems edit the file interfaces in /etc/network:
nano /etc/network/interfaces

You'll see a file that looks like this:
auto eth0
iface eth0 inet static
  address 192.168.1.1
  netmask 255.255.255.0
  gateway 192.168.1.254


Edit the file to look like this:

auto eth0
iface eth0 inet static
  address 192.168.1.1
  netmask 255.255.255.0
  gateway 192.168.1.254

auto eth0:0
iface eth0:0 inet static
  address 192.168.1.2
  netmask 255.255.255.0

Save the file and bring up the device with this command:
ifup eth0:0

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