Validation

Changing the hostname (computer name) in Ubuntu can be done through various methods. Keep in mind that altering the hostname might require a system reboot for the changes to take effect. Here’s a detailed guide on how to change the hostname in Ubuntu.

Changing the Hostname via the Command Line:

1) Open the Terminal:

Press Ctrl + Alt + T to open the terminal.

2) Check the Current Hostname:

Execute the following command:

hostname

3) Modify the Hostname:

Edit the /etc/hostname file using a text editor, e.g., using nano:

sudo nano /etc/hostname

Replace the current hostname with the new one and save the changes ( ctrl + x ).

4) Update the Hostname in the hosts file:

Edit the /etc/hosts file:

sudo nano /etc/hosts

4) Apply the Changes:

Reboot the server to apply the new hostname:

sudo reboot



Changing the Hostname using hostnamectl command:

1) Check the Current Hostname:

hostnamectl

2) Modify the Hostname:

sudo hostnamectl set-hostname new_hostname

3) Apply the Changes:

sudo systemctl restart systemd-hostnamed

Or, reboot the server.



Verify the Changes:

After the server reboot, check if the changes have taken effect:

hostname

You should now see the new hostname.

Changing the hostname in Ubuntu is a standard procedure, but be aware that some programs and services may rely on the hostname. Therefore, exercise caution when making these changes in a production environment, and test in a safe environment before applying them.