docker mysql + phpmyadmin

gistfile1.yml

version: '2'
services:
    db:
        image: mysql:5.7
        ports:
            - "3306:3306"
        volumes:
            - ./mysqldata:/var/lib/mysql:rw,delegated
        environment:
            MYSQL_ROOT_PASSWORD: "root"
            MYSQL_DATABASE: "symfony"
            MYSQL_USER: "symfony"
            MYSQL_PASSWORD: "symfony"
            MYSQL_ALLOW_EMPTY_PASSWORD: 1

    myadmin:
         image: phpmyadmin/phpmyadmin
         ports:
             - "8080:80"
         depends_on:
             - db