Add an IP address to CentOS server

Sometimes due to business growth or testing purposes, we do need an IP address assigned to the server interface. When I came across with adding IP to server, it was little annoying. I followed many number of Google results but ended with wrong configuration.

Finally I myself found out that simply restarting network after adding IP address would be enough.

To add IP,

Make a copy of existing interface config in /etc/sysconfig/network-scripts/ifcfg-eth0 to ifcfg-eth0:0

Get in to the folder,

#cd /etc/sysconfig/netwok-scripts

#cp ifcfg-eth0 ifcfg-eth0:0

Edit newly created interface,

#nano ifcfg-eth0:0

Change the device to eth0:0

And change the IP address,

# Please read /usr/share/doc/initscripts-*/sysconfig.txt

# for the documentation of these parameters.

TYPE=Ethernet

DEVICE=eth0:0

HWADDR=xx:xx:xx:xx:xx:xx

BOOTPROTO=none

NETMASK=255.255.255.0

IPADDR=192.168.1.12

Save and close the file.

Finally restart network as /etc/init.d/network restart

Verify the added IP by  running ifconfig

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