Ubuntu 18.04 LTS Set Hostname Permanently

Ubuntu 18.04 LTS Set Hostname Permanently

 

In this article I will show how to set hostname in Ubuntu server 18.04 permanently. Lets say my server old hostname is: serv and should be changed to: serv1.

Ubuntu Server 18.04 Set hostname

 

In Ubuntu 18.04 hostnamectl command using for query, change the system hostname and related settings.

To show Ubuntu server 18.04 hostname type:

$ hostnamectl

As you see on picture below the current hostname is: serv.

Example output:

ubuntu 18.04 hostname

ubuntu 18.04 hostname

Now lets set hostname to serv1:

$ sudo hostnamectl set-hostname serv1

 

Display IP address on Ubuntu 18.04

 

If you know your server IP address you can skip this paragraph.

To display IP address on Ubuntu 18.04 type:

$ ip a

Example output:

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:52:df:f7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.83.131/24 brd 192.168.83.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe52:dff7/64 scope link
       valid_lft forever preferred_lft forever

So in my case on my IP address is: 192.168.83.131/24

 

 

Edit hosts file

 

Then we need edit hosts file: /etc/hosts (you can use any text editor)

$ sudo vi /etc/hosts

Ubuntu 18.04 hosts

After 127.0.0.1 localhost.localdomain localhost  add your host IP and desired hostname. Something like this:

127.0.0.1 localhost.localdomain localhost
192.168.83.131 serv1
::1 localhost6.localdomain6 localhost6

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

Now save and close your editor.

 

 

Preventing Ubuntu Revert To Old Hostname After Reboot

 

I know about common problem: Ubuntu hostname keeps reverting. To preserve hostname and preventing Ubuntu revert to old hostname after reboot you should edit cloud configuration file: /etc/cloud/cloud.cfg.

# vi /etc/cloud/cloud.cfg

Example output:

preserve hostname Ubuntu 18.04 LTS

Change from:

preserve_hostname: false

to:

preserve_hostname: true

Then save and close opened cloud.cfg file.

 

Now you can reboot your server and verify changes to make sure everything is fine after reboot.

$ hostnamectl

   Static hostname: serv1
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 636bc4706e6a4a4db155e10f427cf812
           Boot ID: a3eaf86094d24a6d8a966fdec88b020a
    Virtualization: vmware
  Operating System: Ubuntu 18.04.3 LTS
            Kernel: Linux 4.15.0-58-generic
      Architecture: x86-64

In this tutorial I explained how to change hostname  in Ubuntu 18.04 server.

Summary
Ubuntu 18.04 LTS Set Hostname Permanently
Article Name
Ubuntu 18.04 LTS Set Hostname Permanently
Description
Ubuntu 18.04 set hostname. How to to change hostname in Ubuntu Server 18.04 LTS permanently, and preserve hostname from changing after server reboot
Author
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ARSTECH
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