How to Set or Change Hostname on AlmaLinux 9

To change the hostname on AlmaLinux 9, follow these steps:

Step 1 : Check the current hostname

First, verify the current hostname by running the following command:

hostname

Step 2 : Set a new hostname

To change the hostname, use the hostnamectl command. For example, to set the hostname to server-01, run:

sudo hostnamectl set-hostname server-01

Step 3 : Verify the new hostname

After setting the hostname, check if the change was applied by running:

cat /etc/hostname

Step 4 : Edit /etc/hosts

Next, open the /etc/hosts file to update the hostname mapping:

sudo nano /etc/hosts

Find the line that contains the old hostname and replace it with the new one.

Step 5 : Reboot the system

Finally, reboot your system for the changes to take effect:

sudo reboot

Congratulations, you have successfully changed the hostname on your AlmaLinux 9 system!