version: '2'
services:
  db1:
    image: peterbourgon/tns-db
    networks:
        - back-tier
  db2:
    image: peterbourgon/tns-db
    links:
        - db1
    networks:
        - back-tier
  db3:
    image: peterbourgon/tns-db
    links:
        - db1
        - db2
    networks:
        - back-tier

  app1:
    image: peterbourgon/tns-app
    links:
        - db1
        - db2
        - db3
    networks:
        - front-tier
        - back-tier
  app2:
    image: peterbourgon/tns-app
    links:
        - db1
        - db2
        - db3
    networks:
        - front-tier
        - back-tier

  lb1:
    image: peterbourgon/tns-lb
    links:
        - app1
        - app2
    ports:
        - 0.0.0.0:8001:80
    networks:
        - front-tier
  lb2:
    image: peterbourgon/tns-lb
    links:
        - app1
        - app2
    ports:
        - 0.0.0.0:8002:80
    networks:
        - front-tier
networks:
  front-tier:
    driver: bridge
  back-tier:
    driver: bridge