Google Compute Engine: how to set hostname permanently?

Question

How do I set the hostname of an instance in GCE permanently? I can set it via hostname,but after reboot it is gone again.

I tried to feed in metadata (hostname:f.q.d

Answer 1

An easy way to fix this is to set up a startup script with custom metadata.

Key :startup-script 
Value: 
#! /bin/bash 
hostname