How to Change Hostname on CentOS Linux
Changing the hostname on CentOS Linux involves 4 easy steps. Follow the instructions below:
Step 1: Modify /etc/sysconfig/network
Open the /etc/sysconfig/network file with your favorite text editor, and modify the HOSTNAME value to match your Fully Qualified Domain Name (FQDN) hostname:
sudo nano /etc/sysconfig/networkChange the HOSTNAME value to your new hostname:
HOSTNAME=myserver.domain.comStep 2: Update the /etc/hosts File
Next, modify the /etc/hosts file to associate your server's IP address with the new hostname. This is necessary for internal networking:
sudo nano /etc/hostsEnsure that the new hostname is reflected in the appropriate entry in the hosts file.
Step 3: Use the Hostname Command
The hostname command allows you to change the hostname temporarily for the current session. However, this does not update the hostname for other running programs or ensure persistence after a reboot.
hostname myserver.domain.comStep 4: Restart Networking
Finally, restart the networking service to apply the changes and make sure they persist across reboots:
/etc/init.d/network restart