hostnamectl

Setup Hostname

• We will set up a hostname to identify the server uniquely.

  hostnamectl set-hostname mail.domain.com
  

-Then, verify the change by running this command:

```
hostname
```

• The output should look like this:

  mail.domain.com
  

-Next, update the hosts file:

```
vim /etc/hosts
```

• Change an entry like this:

  x.x.x.x vmi123456.server.net vmi123456 mail.domain.com
  

• Reboot the server to apply the changes.

  shutdown -r now