version: "2"
services:
  mysql55:
    image: mysql:5.5
    ports:
      - "3307:3306"
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD=true
  mysql56:
    image: mysql:5.6
    ports:
      - "3306:3306"
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD=true

Use docker to simplify running MySQL versions.
Use docker to simplify running MySQL versions.
