Mysql Compose

version: '3.1'

services:

  db:
    image: mysql
    environment:
      MYSQL_ROOT_PASSWORD: example
        MYSQL_DATABASE: docker_db
    ports:
      - "3306:3306"
    volumes:
      - mysql-data:/var/lib/mysql

  adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080
volumes:
  mysql-data:Path on Host