Credit to u/brentbrewer for suggesting this change

03.md

@@ -24,17 +24,15 @@ Once you've reconnected back:
 * Use `less` to view the file `/var/log/auth.log`, where any use of `sudo` is logged
 * You could "filter" this by typing: `grep "sudo" /var/log/auth.log` 
 
-If you wish to, you can now rename your server, which in Ubuntu is done by editing two files, and then rebooting:
+If you wish to, you can now rename your server. Traditionally you would do this by editing two files, `/etc/hostname` and `/etc/hosts` and then rebooting - but the more modern, and recommended, way is to use the `hostnamectl` command; like this:
 
-* Edit /etc/hostname using nano text editor, deleting the old name and setting up a new one:
+`hostnamectl set-hostname mylittlecloudbox`
 
-`sudo nano /etc/hostname`
-* Then edit the /etc/hosts file, replacing the existing computer name with your new one:
+No reboot is required.
 
-`sudo nano /etc/hosts`
-* Reboot the system for changes to take effect:
+For a cloud server, you might find that the hostname changes after a reboot. To prevent this, edit `/etc/cloud/cloud.cfg` and change the "preserve_hostname" line to read:
 
-`sudo reboot`
+`preserve_hostname: true`
 
 You might also consider changing the timezone your server uses. By default this is likely to be UTC (i.e. GMT) - which is pretty appropriate for a worldwide fleet of servers. You could also set it to the zone the server is in, or where you and your headquarters are. For a company this is a decision not to be taken lightly, but for now you can simply change as you please!