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How to Set or Change System Hostname?

Step 1 - Check your Current Hostname

Check the Hostname with hostname Command.

$ hostname

Step 2 - Change Hostname with hostnamectl Command

Change the Hostname from oxygen to hydrogen.

$ sudo hostnamectl set-hostname hydrogen

Step 3 - Update /etc/hosts

Use your favorite text editor to change any instances of your old hostname to the new hostname in /etc/hosts. If you have a DNS name pointed to this instance, it's a best practice to also set that name here.

$ sudo nano /etc/hosts

From: localhost oxygen

To: localhost hydrogen.example.com hydrogen

Step 4 - Confirm the Change

Reboot the Server.

Test your change with hostname.

$ hostname