# How do I change the computer name?

When I connect to my server (ubuntu server 10.10), I get this:

name@server-name.belkin ~>


How can I remove ".belkin"?

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Try editing /etc/ hosts. gksudo gedit /etc/hosts and replace server-name.belkin by whatever name you desire. –  LFC_fan Oct 26 '10 at 8:39
Do you want to change the actual server name, or just the way it's displayed in the prompt? –  Dave Jennings Oct 26 '10 at 18:07

You need to edit the computer name in two files:

/etc/hostname


and

/etc/hosts


These will both need administrative access, so run

gksu gedit /path/to/file


Simply replace any instances of the existing computer name with your new one. When complete, restart your computer, and the name will have been changed.

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After that, just sudo service hostname restart and the hostname has been changed without rebooting. –  Anthony O. Nov 20 '13 at 0:37
In Ubuntu 14.04 there is no service 'hostname'. What can I do there to avoid reboot. –  Arpad Horvath Jul 28 '14 at 6:39
@ArpadHorvath status --system hostname tells me that the service exists. So, sudo service hostname restart or sudo restart hostname should work. You probably ran service hostname status and it didn't find it. Read this to learn why. –  Bruno Nova Oct 30 '14 at 12:07
sudo service hostname restart doesn't work on default install of ubuntu server 14.04 on AWS. I had to do full server restart –  gerrytan Oct 30 '14 at 21:47
On 14.04, I simply ran sudo hostname, and that did the trick. I didn't notice any immediate change, but when I opened a new terminal, I saw my hostname had indeed changed. –  TSJNachos117 Nov 22 '14 at 8:33

It's quite easy:

1. Edit /etc/hostname, make the name change, save the file.

2. You should also make the same changes in /etc/hosts file

3. Run sudo /etc/init.d/hostname restart or sudo service hostname restart

As long as you have no application settings depending on the 'old' hostname, you should be ok ;-)

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WARNING: If you do this without changing /etc/hosts accordingly you will be unable to use sudo because your hostname will fail to lookup –  João Pinto Dec 6 '10 at 16:10
You're right regarding editing the /etc/hosts, i forgot about it (just added it to my answer), though sudo seems to be working fine for me without changing it (i've restarted the machine and it still works) –  Pavlos G. Dec 6 '10 at 16:14
I don't have any reference to my hostname (new or old) in /etc/hosts, only localhost and some IPv6 rules. –  Oli Dec 9 '10 at 9:30
networkmanager adds it, at least that happens in my machine. –  Pavlos G. Dec 9 '10 at 10:30
I have xubuntu 10.10 and when did the second step, it told me to run sudo service hostname restart. –  Andrei Vajna II Jan 7 '11 at 10:20

It is safe to do, you just need to be sure you edit both the system hostname configuration file (/etc/hostname) and the hostname name resolution file (/etc/hosts). From a terminal execute the following:

sudo -s
editor /etc/hostname
editor /etc/hosts
shutdown -ry now

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You can avoid shutdown with sudo service hostname restart. –  Wtower Nov 19 '14 at 12:27

In addition to editing /etc/hosts and /etc/hostname, various services might have issues with the change as well. Mysql and postfix are installed by default in ubuntu. A broken postfix won't affect most ubuntu users, since it's a background email server that isn't used by much.

Postfix:

sudo editor /etc/postfix/main.cf
sudo service postfix restart


The default config for mysql doesn't use hostname, so it will work fine as-is. If you have customized it, edit the files in /etc/mysql/ and restart the service.

You may also want to edit /etc/motd (message of the day), which is shown on virtual terminals and remote logins. That one won't harm anything though.

Other services that you may have installed that would need fixing are apache, bind9, etc. In each case, find and edit the hostname in their config and restart the service.

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The host name uniquely identifies your computer on the local network (and possibly on the Internet as well) so it's not a good idea to change it unless you know what you are doing.

But you can change the shell prompt not to display the .belkin (domain name part):

export PS1='\u@\h \w> '


See the bash man page and specifically the section on prompting for more information.

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If you don't want to play with a text editor, Ubuntu Tweak (grab the deb from their website) has that as one of the little things you can play with (along with lots of other little tweaks that you might want to make but don't really want to play around with the terminal and the files themselves).

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Out of curiosity, is there any particular reason why Ubuntu Tweak is not in the software repos? –  Olivier Lalonde Dec 7 '10 at 22:31
They never got around to adding it/haven't been accepted. You can add their repo to your list either right after starting tweak or through the terminal/repo list. –  dkuntz2 Dec 7 '10 at 23:40
You can also add Ubuntu Tweak as a PPA with sudo add-apt-repository ppa:tualatrix/ppa then sudo apt-get update then sudo apt-get install ubuntu-tweak –  d3vid Oct 14 '11 at 7:15
note that since ~13.04 Ubuntu Tweak no longer provides this option –  d3vid Jun 15 '14 at 11:32

## Another better and safe way to rename hostname

Install ailurus

sudo add-apt-repository ppa:ailurus && sudo apt-get update

• Install ailurus

sudo apt-get install ailurus

• After installation it will be found under Applications>>System Tools>>Ailurus
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Why is this getting negative votes? Should be better to configure something with a dedicated tool than muck around on the command line and break things in the process. –  endolith Jan 20 '11 at 3:49
Installing such a big software just to change a hostname is a bit of an overkill –  Capt.Nemo Jun 17 '11 at 1:56
I agree that this is overkill -- in particular because the software not available in the repositories but has to be installed from a PPA... –  Marcel Stimberg Jul 5 '11 at 16:55
@karthick87 perhaps mention in your answer that this is a large piece of software (with other configuration options)? - personally I agree with endolith that a tool with a single, simple change point is better than lots of command line operations (I use Ubuntu Tweak, also currently available from a PPA) –  d3vid Oct 14 '11 at 7:19

If you want a GUI assisted process install Ubuntu-Tweak. Among other uses of this app is the ability to change computer name through tab "Computer-Details" -> "Hostname"

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Use the hostname command to change your hostname

sudo hostname newname


However, this does not edit your hosts file, which you must do so as to make sure that your computer recognizes itself

gksudo /etc/hosts


oldname  127.0.0.1
newname  127.0.0.1


You could remove the old entry as well, but I prefer to keep it there.

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Open a terminal and

sudo sed -i '1s/.*/desired-name/g' /etc/hostname

# you need restart to effect with...

sudo shutdown -r 0

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The following command change the hostname on the fly but to make it permanent, you have to edit /etc/hostname:

    echo 'new_hostname' > /proc/sys/kernel/hostname


Open a new terminal session and you'll see it right away.

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