http://blog.guiltry.com/docker-for-development/

docker-compose.yml

web:
  build: .
  command: bundle exec rails s
  volumes:
    - .:/myapp
  ports:
    - "3000:3000"
  links:
    - db
    - redis
    - elasticsearch

db:
  image: mongo:2.6.10
  ports:
    - "27017:27017"

redis:
  image: redis:2.8.21
  ports:
    - "6379:6379"

elasticsearch:
  image: elasticsearch:1.5.2
  ports:
    - "9200:9200"