Wordpress docker file

docker-compose.yml

version: '3'
services:
  wordpress:
    depends_on:
      - db
    image: wordpress:4.9.4
    restart: always
    volumes:
      - ./wp-content:/var/www/html/wp-content 
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
      WORDPRESS_DB_NAME: wordpress
      WORDPRESS_TABLE_PREFIX: wp_
    ports:
      - 80:80 # Expose http and https
      - 443:443
    domainname: local.testsite.co.uk
    networks:
      - back
  db:
    image: mysql:5.7
    restart: always
    volumes:
       - db_data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: wordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    ports:
      - 4306:3306
    networks:
      - back
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    restart: always
    ports:
      - 8080:80
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: wordpress
    networks:
      - back
networks:
  back:
volumes:
  db_data: