docker堆栈: Redis not working on worker node

Question

我刚刚完成了 docker 文档并在 aws 上创建了两个实例( http://13.127.150.218 、 http://13.235.134.73 )。第一个是经理，第二个是 worker 。以下是我用来部署的组合文件

version: "3"
services:
  web:
    # replace username/repo:tag with your name and image details
    image: username/repo:tag
    deploy:
      replicas: 5
      restart_policy:
        condition: on-failure
      resources:
        limits:
          cpus: "0.1"
          memory: 50M
    ports:
      - "80:80"
    networks:
      - webnet
  visualizer:
    image: dockersamples/visualizer:stable
    ports:
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints: [node.role == manager]
    networks:
      - webnet
  redis:
    image: redis
    ports:
      - "6379:6379"
    volumes:
      - "/home/docker/data:/data"
    deploy:
      placement:
        constraints: [node.role == manager]
    command: redis-server --appendonly yes
    networks:
      - webnet
networks:
  webnet:

这里redis服务有一个限制，限制它只能在管理节点上运行。现在我的问题是工作实例上的Web服务应该如何使用redis服务。

Answer 1

您需要在所有容器中使用hostname参数，以便您可以使用该值来访问worker上的服务或从worker上访问manager上的服务。

version: "3"
services:
  web:
    # replace username/repo:tag with your name and image details
    image: username/repo:tag
    hostname: "web"
    deploy:
      replicas: 5
      restart_policy:
        condition: on-failure
      resources:
        limits:
          cpus: "0.1"
          memory: 50M
    ports:
      - "80:80"
    networks:
      - webnet
  visualizer:
    image: dockersamples/visualizer:stable
    hostname: "visualizer"
    ports:
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints: [node.role == manager]
    networks:
      - webnet
  redis:
    image: redis
    hostname: "redis"
    ports:
      - "6379:6379"
    volumes:
      - "/home/docker/data:/data"
    deploy:
      placement:
        constraints: [node.role == manager]
    command: redis-server --appendonly yes
    networks:
      - webnet
networks:
  webnet:

令人上瘾的是，如果您使用 portainer 而不是可视化工具，您可以使用更多选项来控制您的 SWARM 堆栈:

https://hub.docker.com/r/portainer/portainer

BR，

卡洛斯