docker stack,docker secret,docker config

docker stack

之前学的docker-compose.yml 就是一个单机版的多应用服务启动脚本.
那么docker stack 就是个集群版本的多应用服务启动脚本,语法和compose基本相同.

docker stack是基于cluster集群模式，发布服务的一个功能。
docker stack 有如下几个命令
docker stack deploy 发布或者更新一个stack
docker stack list 获取所有stack
docker stack ps 列出stack中运行的task
docker stack services 列出stack中的服务
docker stack rm 移除stack

version: '3'
 
services:
 
  web:
    image: wordpress
    ports:
      - 8080:80
    environment:
      WORDPRESS_DB_HOST: mysql
      WORDPRESS_DB_PASSWORD: root
    networks:
      - my-network
    depends_on:
      - mysql
    deploy: #和单机版不同,这里会设定这个web服务的创建副本数是几个
      mode: replicated
      replicas: 3
      restart_policy:
        condition: on-failure
        delay: 5s
        max_attempts: 3
      update_config:
        parallelism: 1
        delay: 10s
 
  mysql:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: wordpress
    volumes:
      - mysql-data:/var/lib/mysql
    networks:
      - my-network
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == manager
 
volumes:
  mysql-data:
 
networks:
  my-network:
    driver: overlay