all:
  children:
    postgres:
      hosts:
        postgres_master:
          ansible_host: 192.168.51.2
        postgres_slave:
          ansible_host: 192.168.51.3
    postgres_slaves:
      hosts:
        postgres_slave:
          ansible_host: 192.168.51.3
    mongo:
      hosts:
        mongo_primary:
          ansible_host: 192.168.52.2
          mongodb_master: True
        mongo_secondary:
          ansible_host: 192.168.52.3
        mongo_arbiter:
          ansible_host: 192.168.52.4
# запись эквивалентна записи в ini
# [postgres]
# postgres_master ansible_host=192.168.51.2
# postgres_slave ansible_host=192.168.51.3
# [postgres_slaves]
# postgres_slave ansible_host=192.168.51.3
# [mongo]
# mongo_primary ansible_host=192.168.52.2 mongodb_master=True
# mongo_secondary ansible_host=192.168.52.3 mongodb_master=True
# mongo_arbiter ansible_host=192.168.52.4 mongodb_master=True