Docker学习笔记26

news2024/12/25 14:04:11

Docker stack应用：

1）Docker 层级关系中的最高层次——stack，一个stack就是一组有关联的服务的组合，可以一起编排，一起管理。

早期，使用service来发布服务。但是service每次只能发布一个service。

yaml可以发布多个服务，但是使用docker-compose的时候，只能在一台主机上发布。

借助docker swarm同时发布多服务，

是docker 生态service发布的最高层次。

案例：

实现远程管理容器主机及在swarm集群内容器主机运行容器监控：

1）远程管理docker host

2）监控docker host上运行的容器

编写docker-compose.yml文件：

[root@swarm-1 ~]# cat docker-compose.yml
vsesion: "3"

services:
  nginx:
    image: nginx:latest
    ports:
    - "80:80"
    deploy:
      mode: replicated
      replicas: 4

  visualizer:
    image: dockersamples/visualizer
    ports:
    - "9001:8080"
    volumes:
    - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      replicas: 1
      placement:
        constraints: [node.role == manager]

  portainer:
    image: portainer/portainer
    ports:
    - "9000:9000"
    volumes:
    - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      replicas: 1
      placement:
        constraints: [node.role == manager]

docker stack 运行多服务：

[root@swarm-1 ~]# docker stack --help

Usage:  docker stack COMMAND

Manage Swarm stacks

Commands:
  config      Outputs the final config file, after doing merges and interpolations
  deploy      Deploy a new stack or update an existing stack
  ls          List stacks
  ps          List the tasks in the stack
  rm          Remove one or more stacks
  services    List the services in the stack

Run 'docker stack COMMAND --help' for more information on a command.
[root@swarm-1 ~]#

[root@swarm-1 ~]# docker stack deploy -c docker-compose.yaml stack-demo
Creating network stack-demo_default
Creating service stack-demo_nginx
Creating service stack-demo_visualizer
Creating service stack-demo_portainer
[root@swarm-1 ~]#

说明：其中stack-demo_default 这个是创建的网络。

验证是否创建成功：

[root@swarm-1 ~]# docker stack ls
NAME         SERVICES
stack-demo   3

[root@swarm-1 ~]# docker stack services stack-demo
ID             NAME                    MODE         REPLICAS   IMAGE                             PORTS
51n7fc35y4om   stack-demo_nginx        replicated   4/4        nginx:latest                      *:80->80/tcp
vh8zlntxz8qz   stack-demo_portainer    replicated   1/1        portainer/portainer:latest        *:9000->9000/tcp
k0q49sihlbmn   stack-demo_visualizer   replicated   1/1        dockersamples/visualizer:latest   *:9001->8080/tcp
[root@swarm-1 ~]#

说明：REPLICAS：4/4的意思是：期望值是4个，启动了4个。

[root@swarm-1 ~]# docker stack ps stack-demo                                                                                  ID             NAME                      IMAGE                             NODE      DESIRED STATE   CURRENT STATE                ERROR     PORTS
nkcl95hzmbxo   stack-demo_nginx.1        nginx:latest                      swarm-2   Running         Running 3 minutes ago    
jvwpf1um0f5m   stack-demo_nginx.2        nginx:latest                      swarm-3   Running         Running 3 minutes ago    
uu0s6hdguh34   stack-demo_nginx.3        nginx:latest                      swarm-1   Running         Running 3 minutes ago    
mtn8qliw65gp   stack-demo_nginx.4        nginx:latest                      swarm-1   Running         Running 3 minutes ago    
ujfh7q7xho7b   stack-demo_portainer.1    portainer/portainer:latest        swarm-1   Running         Running 2 minutes ago    
mzpsqfkhlaai   stack-demo_visualizer.1   dockersamples/visualizer:latest   swarm-1   Running         Running about a minute ago
[root@swarm-1 ~]#

浏览器访问http://192.168.17.10:9000

可视化管理容器的portainer.io

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