Ubuntu Linux Change Hostname (computer name)

Posted on in Categories , , last updated January 27, 2016

I am a new Ubuntu Linux laptop user. I setup my computer name to ‘tom’ during installation but now I would like to change the computer name to ‘jerry’. How can I remove tom and set it to jerry on Ubuntu Linux? How do I change the Ubuntu computer name from ‘ubuntu’ to ‘AvlinStar’?

You can use the hostname command to see or set the system’s host name. The host name or computer name is usually at system startup in /etc/hostname file. Open the terminal application and type the following command.

Display the current Ubuntu hostname

Simply type the following command:
$ hostname
Sample outputs:

Fig.01: Ubuntu Linux Show the hostname/computer name command
Fig.01: Ubuntu Linux Show the hostname/computer name command

Ubuntu change hostname command

The procedure to change the computer name on Ubuntu Linux:

  1. Type the following command to edit /etc/hostname using nano or vi text editor:
    sudo nano /etc/hostname
    Delete the old name and setup new name.
  2. Next Edit the /etc/hosts file:
    sudo nano /etc/hosts
    Replace any occurrence of the existing computer name with your new one.
  3. Reboot the system to changes take effect:
    sudo reboot

Sample outputs:

Gif 01: Ubuntu change the computer name demo
Gif 01: Ubuntu change the computer name demo

How to change the Ubuntu server hostname without a system restart?

Type the following commands:
$ sudo hostname new-server-name-here
Next edit the /etc/hostname file and update hostname:
$ sudo nano /etc/hostname
Finally, edit the /etc/hosts file and update the lines that reads your old-host-name:
$ sudo nano /etc/hosts
From: old-host-name
To: new-server-name-here
Save and close the file.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

7 comment

  1. Dear Vivek,
    The above is good and solves to Change/Modify hostname/hosts..
    But the same is not holds for System Name
    Ex: [email protected] is changed as [email protected]_desktop or anything else..
    But It could not change “vivek” to newname

  2. Hi it worked and Thank you very much for your help
    I have a Doubt about AWS EC2
    i created a new instance using existing instance and i want to change the hostname of new instance automatically but it showing its private ip address only for the new one
    please help me

    my code is
    aws ec2 create-tags –resources `aws ec2 run-instances –image-id –count 1 –instance-type t2.micro –key-name –user-data file://my-userdata.sh –subnet-id –security-group-ids |jq -r “.Instances[0].InstanceId”` –tags “Key=Name,Value=servername”

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