How to change FQDN ( domain name ) on Ubuntu 20.04 Focal Fossa Linux

First, check your current hostname:
```
$ hostname
server1
$ hostname --fqdn
server1
```
At this point, both, the hostname and FQDN are set to server1.

Optionally, change your hostname before proceeding to the next step.
As an example now we will define the hostname server1 as retrieved in the previous step to be an alias for the fully qualified domain name www.linuxconfig.org on the IP address 1.2.3.4. To do so edit the /etc/hosts file by using the sudoedit /etc/hosts command and add the following line:
```
1.2.3.4 www.linuxconfig.org server1

NOTE
The order is important! The FQDN www.linuxconfig.orgmust precede the hostname server1.
```
All done and no reboot is required. Check your FQDN by using the hostname command:
```
$ hostname --fqdn
www.linuxconfig.org
```
Alternatively, also check your domain name:
```
$ dnsdomainname 
linuxconfig.org
```

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