How to Change Hostname on Ubuntu 20.04
Display the Current Hostname
To view the current hostname, enter the following command:
g g ~ $ hostnamectl Static hostname: g Icon name: computer-desktop Chassis: desktop Machine ID: 9974fd32a5d045e8bb34b25e6961a21f Boot ID: 059fe99116a645c8a81c5fd587f22ba5 Operating System: Ubuntu 20.04.1 LTS Kernel: Linux 5.4.0-42-generic Architecture: x86-64
As you can see in the image above, the current hostname is set to g.
Change the Hostname
The following steps outline how to change the hostname in Ubuntu 20.04.
- Change the hostname using
In Ubuntu 20.04 we can change the system hostname and related settings using the command hostnamectl.
For example, to change the system static hostname to
dev, you would use the following command:
sudo hostnamectl set-hostname dev
hostnamectl command does not produce output. On success, 0 is returned, a non-zero failure code otherwise.
- Edit the
/etc/hosts file and change the old hostname to the new one.
127.0.0.1 localhost 127.0.0.1 dev # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters
- Edit the cloud.cfg file.
If the cloud-init package is installed you also need to edit the
cloud.cfg file. This package is usually installed by default in the images provided by the cloud providers such as AWS and it is used to handle the initialization of the cloud instances.
To check if the package is installed run the following ls command :
ls -l /etc/cloud/cloud.cfg
If you see the following output it means that the package is not installed and no further action is required.
ls: cannot access '/etc/cloud/cloud.cfg': No such file or directory
If the package is installed the output will look like the following:
-rw-r--r-- 1 root root 3169 Apr 27 09:30 /etc/cloud/cloud.cfg
In this case you’ll need to open the
sudo vim /etc/cloud/cloud.cfg
Search for preserve_hostname and change the value from
/etc/cloud/cloud.cfg # This will cause the set+update hostname module to not operate (if true) preserve_hostname: true
Save the file and close your editor.
Verify the change
To verify that the hostname was successfully changed, once again use the
hostnamectl Static hostname: dev Icon name: computer-vm Chassis: vm Machine ID: 6f17445f53074505a008c9abd8ed64a5 Boot ID: 1c769ab73b924a188c5caeaf8c72e0f4 Virtualization: kvm Operating System: Ubuntu 18.04 LTS Kernel: Linux 4.15.0-22-generic Architecture: x86-64
You should see your new server name printed on the console.
In this tutorial, we have shown you how to easily change your Ubuntu server hostname without restarting the machine.
Feel free to leave a comment if you have any questions.