# docker-compose.yml
version: '3'
services:
  #PHP Service
  [...]

  # NGINX Service
  [...]

  #MySQL Service
  db:
    image: mysql:5.7.22
    container_name: db
    restart: unless-stopped
    tty: true
    ports:
      - "3306:3306"
    environment:
      - MYSQL_DATABASE=homestead
      - MYSQL_USER=homestead
      - MYSQL_PASSWORD=secret
      - MYSQL_ROOT_PASSWORD=secret
    volumes:
      - ./dbdata:/var/lib/mysql/
      - ./mysql/my.cnf:/etc/mysql/my.cnf