How to Set or Change Hostname on Ubuntu 24.10

To change the hostname on Ubuntu 24.10, follow these steps to update it across your system properly.

Step 1 : Check the current hostname

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

hostname

This will display the current hostname of your system.

Step 2 : Change the hostname

To set a new hostname, use the hostnamectl command. Replace "server-01" with your desired hostname:

sudo hostnamectl set-hostname server-01

Step 3 : Verify the new hostname

After setting the new hostname, confirm that it has been updated:

hostname

You should see the new hostname listed.

Step 4 : Update the /etc/hosts file

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

sudo nano /etc/hosts

Look for any lines with the old hostname and replace it with the new one (e.g., "server-01").

Step 5 : Reboot the system

To apply the changes fully, reboot your system:

sudo reboot

Congratulations! You've successfully changed the hostname on your Ubuntu 24.10 system.