[Osiris]

Source Set your hostname in Linux

If you are an administrator then you know what a hostname is. If you are not an administrator then you should know the hostname of a computer is the name which a network attached device is known. Unless you have manually changed your hostname, or set it up during installation, your hostname will most likely be “localhost.localdomain”.
Hostnames are most often used for administrative habits. In other words hostnames will show up in some scanning applications, can be used for name to IP address resolution, and much more. But to make this useful you will have to manually set your hostname on your Linux machine. This article will show you just how to do that.