Docker Stack WordPress phpmyadmin mysql

docker-stack.yml

version: '2'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: wordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   phpmyadmin:
     image: corbinu/docker-phpmyadmin
     ports:
       - 8181:80
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: wordpress
       MYSQL_USER: wordpress
       MYSQL_USERNAME: wordpress
       MYSQL_PASSWORD: wordpress
       MYSQL_PORT_3306_TCP_ADDR: db
       PMA_USERNAME: wordpress
       PMA_PASSWORD: wordpress

   wordpress:
     image: wordpress:latest
     ports:
       - 80
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       
volumes:
    db_data:

https://stackoverflow.com/questions/33376438/phpmyadmin-connection-for-controluser-as-defined-in-your-configuration-failed

https://stackoverflow.com/questions/50553958/cant-get-access-to-db-via-phpmyadmin-docker

https://github.com/corbinu/docker-phpmyadmin/blob/master/sources/config.inc.php#L38

https://github.com/portainer/templates/blob/master/stacks/wordpress/docker-stack.yml