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How to change the primary IP addres of a WHM/cPanel server?

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8 May 2019 7:30 AM
- cPanel

This is for CentOS/RHEL based servers.

Steps in WHM:

- Log into WHM and go to Basic cPanel & WHM Setup
- Change the Primary IP here with the option that says "The IP address (only one address) that will be used for setting up shared IP virtual hosts"
- Note: This might not actually be necessary.
Log in to SSH, and do the following:

- Edit /etc/sysconfig/network-scripts/ifcfg-eth0
  - Change the IPADDR and GATEWAY lines to match the new IP and Gateway for the new ip

- Edit /etc/sysconfig/network
  - Change the GATEWAY line here if it does not exist in the ifcfg-* file.

- Edit /etc/ips
  - Remove the new primary IP from this file if it is present
  - Add the old primary IP to this file with the format ::
- Edit /var/cpanel/mainip
  - Replace the old primary IP with the new primary IP

- Edit /etc/hosts
  - Replace the old primary IP with the new one if needed. The hostname's dns will need to be updated too

- Restart the network service to make the new IP the primary
  - service network restart
  - Note: You're probably going to be disconnected at this point, and have to log in to ssh using the new primary ip.

- Restart the ipaliases script to bring up the additional IP
  - service ipaliases restart
- Run ifconfig and make sure all IPs show up correctly.

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