This one is going to be pretty simple, its changing the hostname of your linux machine whether its your home PC or server. We will go over 2 different ways to do it, the old school way that still works and the new way using hostnamectl. We will also go over adding a domain to your host.

Old School Way

1. The old school way to change the hostname is to edit the file /etc/hostname. Simply add your hostname of choice which will be the only line on that file.

sudo vim /etc/hostname

2. Replace whatever is currently in the text file with the new hostname and save.

debian

3. Now lets edit the /etc/hosts file and add our hostname using the following format.

sudo vim /etc/hosts

172.16.32.5 debian debian

4. Reboot linux to apply changes.

5. Run the  command to verify the new hostname.

debian@debian:~$ hostname
debian

New School Way

1. Run the following command to set your new hostname.

sudo hostnamectl set-hostname debian

2. Logout and log back in and run the following command to verify the hostname.

debian@debian:~$ hostname
debian

Set FQDN

1. Edit the /etc/hosts file and append the domain name to the second field.

sudo vim /etc/hosts

172.16.32.5 debian.linuxman.local debian

2. Reboot linux and check the FQDN using the following command.

debian@debian:~$ hostname -f
debian.linuxman.local

Check only the domain:

debian@desktop:~$ hostname -d
linuxman.local

Done! Simple!