This article covers how to change the hostname on Debian 9 system using different methods. Basically, the hostname is a label that is assigned during the initial server setup and it is used to identify and easily distinguish one server from another.
To check your current hostname:
And to check your Fully Qualified Domain name (FQDN) you can run the following command instead:
$ hostname -f
How to Change your Debian hostname ?
1. To change your hostname, we can simply run the following command:
$ hostname new.hostname.com
2. So in order to change our hostname permanently, you will need to update this file. You can open it with your favorite text editor, for example:
$ nano /etc/hostname
3. Change the hostname, save the file and exit the text editor.