YAML entity files

YAML files are the default expected format, so you can use .yml, .yaml, or even .txt - as long as the file contains a valid yaml LIST, then it will be loaded.

/etc/OliveTin/servers.yaml
server1:
  state: started
  hostname: server1.example.com
  ip: 192.168.0.1
server2:
  state: started
  hostname: server2.example.com
  ip: 192.168.0.2
server3:
  state: stopped
  hostname: server3.example.com
  ip: 192.168.0.3