Hostname X FQDN
Hostname
Hostname is the name that you give to your machine.
It is used on your local network and is shown at terminal after the name of loged user,
ex: john@[hostname]. There is no way to access your server remotely with this name.
The name could be anything that start with a letter and can have numbers, undercore and dash.
Ex: “john-notebook” or “office-pc3” or “plato”.
1 | $ echo "machine-name" > /etc/hostname |
FQDN
Full Qualified Domain Name is the domain that you pay to register.
It is the only way that you can access your machine by a name and not by an IP.
ex: company.com, myblog.net, or restaurant.com.br, it is your choice.
Configure it is mandatory when you want to have a valid reverse dns.
Update /etc/hosts
Here you will configure your external IP followed by your FQDN and your hostname, in that order.
If yout dont follow that order, you can`t have your reverse dns working.
1 | 127.0.0.1 localhost.localdomain localhost |