Example docker-compose.yml for a Rails application

docker-compose.yml

app:
  build: .
  links:
    - db:db
    - redis:redis
    - memcache:memcache
  volumes:
    - ./:/app
  environment:
    PGHOST: db
    PGUSER: postgres
    REDIS_URL: redis://redis
    MEMCACHE_SERVERS: memcache
db:
  image: postgres
redis:
  image: redis
memcache:
  image: tutum/memcached