Persisting hostname for cloud-init enabled Cloud VPS/VDS

As cloud-init sets the hostname on each reboot, the hostname you wish to set may not be persistent or reboot safe.

There are several possibilities to make sure your hostname remains:

1. simply set the hostname via cloud-init, please refer to Set Hostname. Then it will always be set to the desired name.
2. disable cloud-init altogether by sudo touch /etc/cloud/cloud-init.disabled
3. perform a proper shutdown or reboot of your operating system e.g. via reboot. This will eject the cloud-init file mounted causing setting the hostname on each reboot.