sample-docker-compose.yml

version: "3.7"

networks:
  default:
    driver: bridge

x-base: &base
  networks:
    - default

services:
  postgres:
    <<: *base
    image: postgres:9.6
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 10s
      timeout: 5s
      retries: 5
      start_period: 10s
    environment:
      POSTGRES_PASSWORD: postgres
      POSTGRES_USER: postgres
    ports:
      - 5432
    volumes:
      - ./.data/postgres/data:/var/lib/postgresql/data

  app:
    <<: *base
    image: ruby:2.7
    command: bundle exec puma -b 0.0.0.0 -p 3000
    workdir: /usr/src/app
    ports:
      - 3000
    volumes:
      - ./app:/usr/src/app
    depends_on:
      - database