---
all:
  hosts:
    mail.example.com:
  children:
    webservers:
      hosts:
        foo.example.com:
        bar.example.com:
        # ranges are supported:
        www[01:50].example.com:
        www[01:50:2].example.com:
          # these are variables:
          var_1: value_1
          another_var: 200
    dbservers:
      hosts:
        one.example.com:
        two.example.com:
        three.example.com:
    east:
      hosts:
        foo.example.com:
        one.example.com:
        two.example.com:
    west:
      hosts:
        bar.example.com:
        three.example.com:
    prod:
      children:
        east:
    test:
      children:
        west:
  # add variables for all hosts
  vars:
    my_var: 123