version: '3'  
services:
   mysql:
     image: registry.cn-chengdu.aliyuncs.com/hhjwqh/mysql:5.5
     restart: always
     ports:
       - "3306:3306"

   hello:
     depends_on: 
       - mysql
     image: registry.cn-chengdu.aliyuncs.com/hhjwqh/hello:1.0
     ports:
       - "88:8080"  
     restart: always
     environment:
       DB_HOST: mysql