example of what docker-compose + cloudgate might look like

common.yml

db:
  image: postgres:9.3
  expose:
    - "5432"

redis:
  image: redis:2.8
  expose:
    - "6379"

web:
  build: .
  links:
    - db
    - redis

  expose:
    - "3000"

  command: bundle exec rackup -p 3000

worker:
  build: .
  links:
    - db
    - redis

  command: bin/canvas_job run

development.yml

db:
  extends:
    file: common.yml
    service: db
    
redis:
  extends:
    file: common.yml
    service: redis

web:
  extends:
    file: common.yml
    service: web
  volumes:
    - .:/app
  links:
    - db
    - redis
  environment:
    VIRTUAL_HOST: notorious.docker

worker:
  extends:
    file: common.yml
    service: worker
  volumes:
    - .:/app

production.yml

web:
  extends:
    file: common.yml
    service: web
  links:
    - db
    - redis
  flavor: web
  instance_type: m3.large
  min_size: 2
  max_size: 10
  ssl_cert_arn: "arn:aws:iam::..."
  health_check_path: '/health_check'

worker:
  extends:
    file: common.yml
    service: worker
  links:
    - db
    - redis
  flavor: work
  instance_type: m3.large
  min_size: 1
  max_size: 10

db:
  cg_type: rds
  db_instance_class: db.m3.large
  allocated_storage: 100
  
redis:
  cg_type: elasticache
  num_cache_nodes: 1
  cache_node_type: cache.r3.large  

test.yml

db:
  extends:
    file: common.yml
    service: db
    
redis:
  extends:
    file: common.yml
    service: redis
    
test:
  extends:
    file: common.yml
    service: web
  volumes:
    - coverage:/app/coverage
  environment:
    RAILS_ENV: test
  command: bundle exec rake