Linux How To Change Hostname
If you are setting up or managing a Linux system there is a good chance that you will want to change the hostname at some point. Fortunately this is relatively easy to do.
If you are running systemd ( modern Ubuntu/Debian systems, Arch, Red Hat, etc. ) you can use the hostnamectl command to change your hostname like this. This will immediately change the hostname and update the configuration in the /etc/hostname file but may not necessarily update the /etc/hosts file for you.
Update your hostname with systemd:
hostnamectl set-hostname zippy-zap
Check that the hostname was updated:
Alternative Method to Change Hostname on Linux
You can also use these steps.
Change your hostname now with this command:
sudo hostname zippy-zap
Change the hostname in this file ( swap old name for new ):
sudo nano /etc/hostname
Change it in this file as well ( swap old name for new ):
sudo nano /etc/hosts
Reboot to make sure that your configs are valid and that the change will survive a reboot.
Check your hostname to verify that it was in fact changed to what you want.