Docker Stack简介及使用

1.简介

Docker Compose的缺点是不能在分布式多服务器上使用，Docker swarm的缺点是不能同时编排多个服务，所以才有了Docker Stack，可以在分布式多服务器上同时编排多个服务。

2.使用实例

1.准备docker-compose文件
本地准备两个镜像后，编写compose文件/root/docker-compose.yml：

version: "3.9"
services:
  service1:
    image: "masonzhang/service1:V1"
    deploy:
        replicas: 2
    ports:
      - "8080:8080"

  service2:
    image: "masonzhang/service2:V1"
    deploy:
        replicas: 3
    ports:
      - "8081:8081"

2.swarm集群搭建
可参考：docker swarm安装使用

3.stack部署

$ docker stack deploy myapps --compose-file=/root/docker-compose.yml

4.stack其他操作
查看所有stack的信息

$ docker stack ls

NAME      SERVICES   ORCHESTRATOR
myapps    2          Swarm

查看某个stack中的所有任务信息

$ docker stack ps myapps

ID             NAME                IMAGE                    NODE      DESIRED STATE   CURRENT STATE
tvvujrf3qcr1   myapps_service1.1   masonzhang/service1:V1   node1     Running         Running 46 seconds ago       
igjeydmmvzzm   myapps_service1.2   masonzhang/service1:V1   manager   Running         Running 46 seconds ago       
7p5c96eplwl3   myapps_service2.1   masonzhang/service2:V1   node1     Running         Running 34 seconds ago       
7shglsajip5d   myapps_service2.2   masonzhang/service2:V1   manager   Running         Running 39 seconds ago       
upo0mr7j9tn1   myapps_service2.3   masonzhang/service2:V1   node2     Running         Preparing 41 seconds ago  

查看某个stack中的所有服务信息

$ docker stack services myapps

ID             NAME              MODE         REPLICAS   IMAGE                    PORTS
icz3kjn0skb3   myapps_service1   replicated   2/2        masonzhang/service1:V1   *:8080->8080/tcp
myuzlwnrxag4   myapps_service2   replicated   3/3        masonzhang/service2:V1   *:8081->8081/tcp

移除stack

docker stack rm myapps