In this tutorial how to change hostname from ubuntu 21.04 server. This is latest release April 22, 2021. Many features include this ubuntu version. Also change logo and background color.

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Step #01: Check server version using below command.

root@ubuntu21:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.5 LTS
Release:        21.04
Codename:       Hirsute

Must be change cloud.cfg file. Open cloud.cfg file using any editor.

root@ubuntu21:~# vi /etc/cloud/cloud.cfg

Then change false to true. As like below

preserve_hostname: true

Then save press Esc type :wq then press Enter.

Step #02: Open hosts file and edit server ip address and hostname.

root@ubuntu21:~# vi /etc/hosts

as like below

127.0.0.1 localhost
10.66.100.9 Server.technologyrss.local Server

Then save press Esc type :wq then press Enter.

Then again open hostname file and edit your hostname.

root@ubuntu21:~# vi /etc/hostname

As like below

Server

Then save press Esc type :wq then press Enter.

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