多容器 GRPC 服务通信

1. 创建 docker network

   docker network create flask-admin-dev

2. 编排容器

   # server
   version: "2"
   services:
       notify_service_dev:
           build: .
           image: notify-service:0.1
           container_name: notify_service_dev
           volumes:
               - .:/code
           networks:
               - back
           ports:
               - "50051:50051"
               - "7001:7001"
           tty: true
           restart: always
           entrypoint: /bin/sh -c "npm run dev"
   
   networks:
       back:
           external:
               name: flask-admin-dev
               
   
   # client
   version: "2"
   services:
       mysql_dev:
           image: mysql:5.7.14
           container_name: fa_mysql_dev
           environment:
               - MYSQL_ROOT_PASSWORD=Chuangyizhi2013,
           volumes:
               - ./mysql/my.cnf:/etc/mysql/my.cnf
               - ./init_database.sql:/docker-entrypoint-initdb.d/init_database.sql
               - ./mysql/data:/var/lib/mysql
           ports:
               - "13306:3306"
           networks:
               - back
           restart: always
   
       flask-admin_dev:
           build: .
           image: flask-admin-dev:0.1
           container_name: flask-admin-dev
           volumes:
               - .:/code
           links:
               - mysql_dev
           environment:
               - ENV=dev
               - MYSQL_HOST=mysql_dev
               - MYSQL_USER=root
               - MYSQL_PASSWORD=Chuangyizhi2013,
               - MYSQL_DATAbase=flask_notify
               - MYSQL_PORT=3306
               - FLASK_ENV=development
           networks:
               - back
           ports:
               - "5000:5000"
           tty: true
           restart: always
           entrypoint: /bin/sh -c "python app.py db upgrade && python app.py runserver -h 0.0.0.0 -p 5000"
   
   networks:
       back:
           external:
               name: flask-admin-dev
               
   
   # 注意：需要保证 server 和 client 在同一个 docker 网桥中
   
   

3. server 端启动服务

   host: 0.0.0.0 或者 127.0.01

4. client 端连接 GRPC Service 需要使用 GRPC server 中的容器名连接

   with grpc.insecure_channel(notify_service_dev:50051) as ch:

保证服务同一个网桥段下原因：docker 默认会为每个容器创建一个独立的名称空间，如果不指定同一网桥下容器 host，docker 默认会找本容器中的 localhost 地址，由于容器见网络是独立导致多个 GRPC 服务无法相互访问

参考：https://stackoverflow.com/questions/44642241/use-grpc-to-communicate-between-containers