7.7 Docker Stack部署Wordpress

docker-compose.yml相关字段

• ENTRYPOINT_MODE 有vip模式和dnssr模式，vip模式就是使用多个容器统一的虚拟ip，dnsrr就是使用真实的IP，然后轮询ip，默认使用vip模式
• MODE 一种是global、一种是replicated，前者不支持横向扩展，后者支持。
• PLACEMENT 指定容器部署的节点、操作系统等等。
• RESOURCES 主要是做一些CPU、内存等资源的限制
• RESTART_POLICY 用于设定容器自动重启的条件
• update_config 用于更新时候的配置

使用docker-compose.yml在swarm上部署

version: '3'
services:
  web:
    image: wordpress
    ports:
      - 8080:80
    depends_on:
      - mysql
    environment:
      WORDPRESS_DB_HOST: mysql
      WORDPRESS_DB_PASSWORD: root
    networks:
      - wordpress-overlay
    deploy:
      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:
      - wordpress-overlay
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == manager
volumes:
  mysql-data:
networks:
  wordpress-overlay:
    driver: overlay

配置部署

docker stack deploy -c docker-compose.yml wordpress

查看分布

[vagrant@swarm-manager wordpress-overlay]$ docker stack services wordpress
ID NAME MODE REPLICAS IMAGE PORTS
gzhzyuo71ycz wordpress_web replicated 3/3 wordpress:latest *:8080->80/tcp
v2lsqkq0sjr3 wordpress_mysql global 1/1 mysql:5.7

使用如下三个链接都是可以访问的

http://192.168.205.10:8080
http://192.168.205.11:8080
http://192.168.205.12:8080

销毁stack

docker stack rm wordpress