Docker para WordPress com Compose

docker-compose.yml

wp:
  image: wordpress:latest
  ports:
    - 80:80
  volumes:
    - ./html:/var/www/html/
  environment:
    WORDPRESS_DB_NAME: wp
    WORDPRESS_DB_USER: root
    WORDPRESS_DB_PASSWORD: 123
  links:
    - db:mysql

db:
  image: mariadb
  environment:
    MYSQL_ROOT_PASSWORD: 123
  volumes:
    - ./db:/var/lib/mysql

phpmyadmin:
  image: phpmyadmin/phpmyadmin
  ports:
    - 8080:80
  links:
    - db:mysql
  environment:
    PMA_HOST: mysql