Docker学习笔记26-编程知识

Docker学习笔记26

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:latestports:- "80:80"deploy:mode: replicatedreplicas: 4visualizer:image: dockersamples/visualizerports:- "9001:8080"volumes:- "/var/run/docker.sock:/var/run/docker.sock"deploy:replicas: 1placement:constraints: [node.role == manager]portainer:image: portainer/portainerports:- "9000:9000"volumes:- "/var/run/docker.sock:/var/run/docker.sock"deploy:replicas: 1placement:constraints: [node.role == manager]

docker stack 运行多服务：

[root@swarm-1 ~]# docker stack --helpUsage:  docker stack COMMANDManage Swarm stacksCommands:config      Outputs the final config file, after doing merges and interpolationsdeploy      Deploy a new stack or update an existing stackls          List stacksps          List the tasks in the stackrm          Remove one or more stacksservices    List the services in the stackRun '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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