Basic docker Wordpress setup with persing database (don't know where it is stored) and persisting Wordpress root and phpMyAdmin running

docker-compose.yml

version: '3'

services:
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: somewordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
  phpmyadmin:
    image: phpmyadmin/phpmyadmin:latest
    ports:
      - "2223:80"
    links:
      - db:mysql
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    volumes:
      - ./:/var/www/html
    ports:
      - "8080:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
volumes:
  db_data: