How do I manually add a second IP address to my CentOS installation? Print

If you have purchased a second ip address for your CentOS installation and need to add the new static ip address, follow these simple steps:

You will first need to identify the current interface name, which will likely be either eth0 or ens3, you can find out by running the following command on the server:

ip link show

If you see eth0 referenced:

Create the following file:

/etc/sysconfig/network-scripts/ifcfg-eth0:1

And inside this file add the following contents, be sure to replace 123.45.67.89 with your new ip address:

DEVICE=eth0:1
BOOTPROTO=static
IPADDR=123.45.67.89
NETMASK=255.255.255.0
ONBOOT=yes

Once completed, activate this and restart networking with the following commands:

ifup eth0:1
service network restart

If you see ens3 referenced:

Create the following file:

/etc/sysconfig/network-scripts/ifcfg-ens3:1

And inside this file add the following contents, be sure to replace 123.45.67.89 with your new ip address:

DEVICE=ens3:1
BOOTPROTO=static
IPADDR=123.45.67.89
NETMASK=255.255.255.0
ONBOOT=yes

Once completed, activate this and restart networking with the following commands:

ifup ens3:1
service network restart

If you have any trouble, please do not hesitate to reach out to [email protected]