version: '2'
services:
  db:
    container_name: mysql_db
    image: mysql:5.7
    volumes:
      - "./.data/db:/var/lib/mysql"
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: wordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress

  wordpress:
    container_name: wordpress
    depends_on:
      - db
    image: wordpress:latest
    links:
      - db
    ports:
      - "8000:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_PASSWORD: wordpress
    volumes:
      - wordpress/:/var/www/html/

volumes:
    wordpress:

MacBookAir:wordpress carlwainwright$ docker volume inspect wordpress_wordpress
[
    {
        "Name": "wordpress_wordpress",
        "Driver": "local",
        "Mountpoint": "/var/lib/docker/volumes/wordpress_wordpress/_data",
        "Labels": null,
        "Scope": "local"
    }
]
MacBookAir:wordpress carlwainwright$ ls -l /var/lib/docker/volumes/wordpress_wordpress/_data/
ls: /var/lib/docker/volumes/wordpress_wordpress/_data/: No such file or directory