hosts.yml

hosts:
  db:
    master:
      hosts:
        - db-master1.domain.tld
      roles:
        - unix_users
        - postgres_master
        - prometheus_pg_exporter
    slave:
      hosts:
        - db-slave1.domain.tld
      roles:
        - unix_users
        - postgres_slave
        - prometheus_node_exporter
        - prometheus_pg_exporter
    etl:
      hosts:
        - etl1.domain.tld
      roles:
        - unix_users
        - python
        - prometheus_node_exporter
        - my_own_etl_role
  redis:
    hosts:
      - redis1.doman.tld
    roles:
      - unix_users
      - redis
      - prometheus_redis_exporter
  api:
    hosts:
      - app1.domain.tld
      - app2.domain.tld
      - app3.domain.tld
    roles:
      - unix_users
      - ruby
      - prometheus_node_exporter
      - prometheus_rails_exporter
  worker:
    hosts:
      - worker1.domain.tld
      - worker2.domain.tld
    roles:
      - unix_users
      - ruby
      - prometheus_node_exporter
      - prometheus_sidekiq_exporter