How to Set or Change Hostname on Debian 13

To change the hostname on Debian 13, follow the steps below:

Step 1 : Check the current hostname with this command:

hostname

Step 2 : Set the new hostname to server-01 using hostnamectl:

sudo hostnamectl set-hostname server-01

Step 3 : Confirm the new hostname by checking the hostname file:

cat /etc/hostname

Step 4 : Edit the hosts file to match the new hostname:

sudo nano /etc/hosts

Update the entry to:

127.0.1.1   server-01

Save and exit the file.

Step 5 : Reboot the system to apply the changes:

sudo reboot

Congratulations, you have successfully set or changed the hostname on Debian 13.