How to Change Hostname on Ubuntu

Introduction

A hostname is a user-generated custom name that identifies a computer system in a network. In Ubuntu, users assign a hostname to the machine during the operating system (OS) setup.

In this tutorial, you will learn how to change a hostname on Ubuntu using the Linux command line or GUI.

Prerequisites

• Ubuntu installed (this tutorial uses Ubuntu 22.04).
• An account with sudo or root privileges.
• Access to the Terminal for non-GUI methods.

How to Check Current Hostname on Ubuntu

To check the current hostname of your Ubuntu system, use one of the two available commands: <strong>hostname</strong> or hostnamectl.

To print only the hostname, run the hostname command:

hostname

To display both the hostname and additional information about your system, run hostnamectl:

hostnamectl

The Static hostname line displays your machine's hostname.

Change Hostname on Ubuntu via CLI (No Reboot)

If you wish to permanently change the hostname without rebooting your computer, use the hostnamectl command.

Step 1: Use set-hostname to Change the Hostname

Type the following command to change your hostname:

hostnamectl set-hostname new-hostname

For example, to change the hostname to test-pnap, run the following:

hostnamectl set-hostname test-pnap

Step 2: Confirm the Change

If successful, hostnamectl set-hostname does not produce any output. Therefore, use hostname or hostnamectl to check the result.

hostname

Step 3: Change the Pretty Hostname (Optional)

A "pretty" hostname is the hostname presented to the user, not to other computers on a network. A computer system identifies another computer only by its static hostname.

To change a machine's pretty hostname, use the same hostnamectl command with the --pretty option:

hostnamectl set-hostname new-hostname --pretty

For example, set your machine's pretty hostname to pnap-test with:

hostnamectl set-hostname pnap-test --pretty

Since the command has no output, check the result with hostnamectl:

hostnamectl

The output prints an additional line, listing the computer's pretty hostname.

Change Hostname on Ubuntu via CLI (Reboot Required)

Another way to permanently change the hostname is by editing two configuration files: /etc/hostname and /etc/hosts.

The changes take effect immediately after the system reboots.

Step 1: Open /etc/hostname and Change the Hostname

Edit the file with a text editor of your choice. In this example, we use the Vim editor. Take the following steps:

1. Access the /etc/hostname file:

sudo vim /etc/hostname

The /etc/hostname file contains only the current hostname.

2. Replace the current hostname with your new choice. For example, test.

3. Save the file and exit.

Step 2: Open /etc/hosts and Change the Hostname

Edit the /etc/hosts file in the same way. Take the following steps:

1. Access the file in Vim or a different text editor:

sudo vim/etc/hosts

The file /etc/hosts maps hostnames to IP addresses.

2. Look for the hostname you wish to change and replace it with your new choice, for example, with test.

3. Save the edits and exit.

Step 3: Reboot the System

Reboot your computer to apply the changes:

sudo systemctl reboot

Change Hostname on Ubuntu via GUI

The Ubuntu GUI also provides a way to edit the system hostname. Take the following steps:

1. Access Settings.

2. Navigate to the About section.

3. Locate the Device Name field.

Click the Device Name field to open the Rename Device dialogue box.

4. In the Rename Device dialogue box, replace the current hostname with a new one and confirm your choice by clicking the Rename button. For example, set the new hostname as pnap.

This action permanently changes the hostname.

Temporarily Change Hostname on Ubuntu

Use the hostname command to change your computer's hostname temporarily. The syntax is:

sudo hostname new-hostname

For example, to temporarily change the hostname to test-pnap, run:

sudo hostname test-pnap

If successful, this step does not provide any output. To confirm the result, check the current system hostname:

Conclusion

This article presented different methods for changing the hostname on your Ubuntu machine using the command line or GUI. It also showed you how to change your hostname temporarily.