awesome-compose/ruby_on_rails-postgres/docker-compose.yml

version: '2'
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
    environment:
      POSTGRES_USER: 'username'
      POSTGRES_HOST_AUTH_METHOD: trust
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && yarn install --check-files && rake db:create db:migrate && bundle exec rails s -b 0.0.0.0"
    volumes:
      - ./web:/myapp
    ports:
      - "3000:3000"
    depends_on:
      - db