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Change Hostname in Ubuntu 16.04 Without Restart

Last updated: June 13, 2016

computer name ubuntu 16.04

Quick tutorial for those who want to change the Hostname (Computer name) in Ubuntu 16.04 Server or Desktop without a restart.

1. To change hostname temporarily so it works until you reboot the machine:

In terminal / command console, run the command:

sudo hostname NEW_NAME_HERE

2. To permanently change your computer name, you may edit the “/etc/hostname” and “/etc/hosts” files.

Open terminal and run command:

gksudo gedit /etc/hostname /etc/hosts

You may need to install gksu first via command sudo apt install gksu.

For Ubuntu Server, use two nano commands instead (Press Ctrl+X, followed by Y, and then Enter to save changes):

sudo nano /etc/hostname
sudo nano /etc/hosts

edit-hostname

When the files open, set the new hostname:

  • /etc/hostname is a simple one line file, change the name to whatever your want.
  • /etc/hosts maps IP addresses to host names, change the name in second line and make it SAME to the name in /etc/hostname.

Without restarting your machine, just run the command below to restart hostname service to apply changes:

systemctl restart systemd-logind.service

3. There’s also hostnamectl command with set-hostname flag, which will alter the pretty, the static, and the transient hostname alike:

hostnamectl set-hostname NEW_NAME_HERE

ISSUE: After changing hostname, gedit and other graphical apps use X11/Mir protocol won’t launch from terminal via gksudo, you’ll get something like below:

Failed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(gedit:20511): Gtk-WARNING **: cannot open display: :0

To fix it:

run xauth list command to check authentication cookie.
add a matching cookie for the new hostname:

xauth add "NEW_HOSTNAME/unix:0" MIT-MAGIC-COOKIE-1 cookie-id-here

add-xauth

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    I'm a freelance blogger who started using Ubuntu in 2007 and wishes to share my experiences and some useful tips with Ubuntu beginners and lovers. Please comment to let me know if the tutorial is outdated! And, notify me if you find any typo/grammar/language mistakes. English is not my native language. Contact me via [email protected] Buy me a coffee: https://ko-fi.com/ubuntuhandbook1

    6 responses to Change Hostname in Ubuntu 16.04 Without Restart

    1. Ravi September 12, 2016 at 1:07 pm

      Hi Ji,

      following command not working to take effect of changed hostname :

      systemctl restart systemd-logind.service

      Can you please update?

      Thanks

      • Joel September 25, 2016 at 2:35 am

        @Ravi

        Hi, it is the right command. If you’re not root you’ll need to use it with sudo though. Like so:.

        # sudo systemctl restart systemd-logind.service

        @Ji

        Thanks for the nice tutorial. Clear & concise

    2. John January 11, 2017 at 8:46 am

      Why they decided to change a simple administrative task, which should need only one command, to be so awkward?

      the hostname manpage has no indicator whatsoever that it’s effects are only temporary. Who needs this anyway?

      Thanks for your article.

    3. Bob January 30, 2017 at 5:30 pm

      Hi ji m,
      Thanks for your very clear and concise instructions.
      Worked OK first time.
      I have seen many of your articles and used quite a few. All without problems for me, so its time I made a comment.
      Keep up your good work.
      Cheers

    4. Rodney Adams February 24, 2017 at 2:52 pm

      I followed the 2 step method and it worked perfectly. Thanks!

    5. SB March 10, 2017 at 5:38 am

      It changed the hostname but after rebooting, I am unable to login.