hostname -f unknown host for CoreOS Droplet

When I run hostname -f on my CoreOS droplet it keeps returning unknown host does anyone know why or if there is a workout for this?

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Below steps should work for me;

hostnamectl set-hostname <>

vi /etc/hosts server1

hostname -f


In order to set your hostname, you will want to use the command

hostnamectl set-hostname yourhostnamehere

After that, run


again to confirm the change.