If you’ve been following the previous steps of this guide, you should have a secure, freshly updated installation of Ubuntu Server which you can access from another computer on the network using SSH. If that’s the case, you can safely unplug the keyboard and monitor from your server – you won’t be needing them. If you’re running your server behind a router (e.g., on a home network), chances are your server won’t be accessible from the outside world. This section explains how to make your server available to the public Internet so you can access it from home or while on the go.
Now that you know how to use your shiny new Linux server, it’s time to make it accessible over the network. After all, the client-server model mentioned earlier doesn’t work very well if the client and the server are the same machine. This part of the guide explains how to set up your server to communicate safely with other devices.