docker-compose with .env (2)

version: '2'
services:
  web:
    image: kamalzairig/drupal-drush
    volumes:
      - /root/drupal:/var/www/html
    ports:
      - ${DRUPAL_PORT}:80
    links:
      - db:mysql
  db:
    image: mysql:5.6
    environment:
      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
      MYSQL_DATABASE: ${MYSQL_DATABASE}
      MYSQL_USER: ${MYSQL_USER}
      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
    volumes:
      - /root/data/mysql:/var/lib/mysql
    ports:
      - ${MYSQL_EXTERNAL_PORT}:3306
  phpmyadmin:
    image: phpmyadmin/phpmyadmin
    links:
      - db:db
    ports:
      - ${PMA_PORT}:80