docker-compose.yml

version: "3.5"

volumes:
  bundle:
    driver: local
  mysql:
    driver: local
  tmp:
    driver: local
  node-modules:
    driver: local

services:
  app:
    build:
      args:
        BUNDLE_WITHOUT: "darwin"
        RAILS_ENV: development
      target: base
      context: .
    image: "my-app:1.0"
    # so things like pry work
    tty: true
    stdin_open: true
    volumes:
      # bind-mount your working directory of code
      - .:/home/app
      # attach a volume at /bundle to keep gems outside of the container image
      - bundle:/bundle
      # attach a volume at ./node_modules to keep node modules cached in a volume
      - node-modules:/home/app/node_modules
      # attach a volume at ./tmp to cache asset compilation, rails cache files
      - tmp:/home/app/tmp
    environment:
      - RAILS_ENV=development
      - MYSQL_HOST=mysql
      - MYSQL_USER=root
      - MYSQL_PASSWORD=root
      - BUNDLE_PATH=/bundle
      - BUNDLE_JOBS=2
      - BUNDLE_RETRY=3
    ports:
      - "3000:3000"
    links:
      - mysql

  mysql:
    image: mysql:8.0.21
    command:
      - --default-authentication-plugin=mysql_native_password
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=app_development
    ports:
      - "3306:3306"
    volumes:
      - mysql:/var/lib/mysql