version: '3'
services:

  db:
    extends:
      file: ./test/assets/mysql_extends.yml
      service: db
    volumes:
      - db_data:/var/lib/mysql
    expose:
      - "3306"
  
  db1:
    extends:
      file: ./test/assets/mysql_extends.yml
      service: db_ext
    volumes:
      - db_data:/var/lib/mysql
    expose:
      - "3306"

volumes:
  db_data: {}