version: '3.3'

services:
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: testdb
      MYSQL_USER: test_user
      MYSQL_PASSWORD: test_password
    ports:
      - 44444:3306
volumes:
    db_data: {}