A quick tutorial for the steps required to change the hostname on your Debian 9 system.
The hostname is set at the time when the Debian operating system is installed or if you are spinning up a virtual machine it is dynamically assigned to the instance at startup.
The method described in this tutorial will work without the need of restarting your Linux system.
Prerequisites:
Before continuing with this tutorial, make sure you are logged in as a user with sudo privileges.
Display the Current Hostname:
Copy to Clipboard1
hostnamectl
Change the Hostname:
Step 1. Change the hostname
Copy to Clipboard1
sudo hostnamectl set-hostname new-host-name.example.com
Step 2. Edit the hosts file:
Copy to Clipboard1
sudo nano /etc/hosts
The file should look similar to this one:Copy to Clipboard1
127.0.0.1 localhost
127.0.0.1 new-host-name.example.com
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
