cloud-init is a tool for early initialization of servers,
  usually in a cloud environment.

It can be used to set the hostname, configure SSH and APT repositories,
  add users, install and configure services, ...

See https://cloudinit.readthedocs.io/en/stable/

 -- Nicolas Braud-Santoni <nicolas@braud-santoni.eu>, Sat, 24 Sep 2016 14:13:24 +0200