Update Swarm mode
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* [安装](machine/install.md)
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* [使用](machine/usage.md)
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* [Docker 三剑客之 Docker Swarm](swarm/README.md)
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* [Swarm mode](swarm_mode/README.md)
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* [基本概念](swarm_mode/overview.md)
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* [创建 Swarm 集群](swarm_mode/create.md)
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* [在 Swarm 集群部署服务](swarm_mode/deploy.md)
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* [在 Swarm 集群中使用 docker-compose.yml](swarm_mode/stack.md)
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* [Etcd 项目](etcd/README.md)
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* [简介](etcd/intro.md)
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* [安装](etcd/install.md)
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version: "3"
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services:
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wordpress:
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image: wordpress
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ports:
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- 80:80
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networks:
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- overlay
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environment:
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WORDPRESS_DB_HOST: db:3306
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WORDPRESS_DB_USER: wordpress
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WORDPRESS_DB_PASSWORD: wordpress
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deploy:
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mode: replicated
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replicas: 3
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db:
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image: mysql
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networks:
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- overlay
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volumes:
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- db-data:/var/lib/mysql
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environment:
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MYSQL_ROOT_PASSWORD: somewordpress
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MYSQL_DATABASE: wordpress
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MYSQL_USER: wordpress
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MYSQL_PASSWORD: wordpress
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deploy:
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placement:
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constraints: [node.role == manager]
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visualizer:
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image: dockersamples/visualizer:stable
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ports:
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- "8080:8080"
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stop_grace_period: 1m30s
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volumes:
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- "/var/run/docker.sock:/var/run/docker.sock"
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deploy:
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placement:
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constraints: [node.role == manager]
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volumes:
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db-data:
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networks:
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overlay:
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## 在 Swarm 集群中使用 docker-compose.yml
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正如之前使用 `docker-compose.yml` 来一次启动、管理多个容器,在 `Swarm` 集群中也可以使用 `docker-compose.yml` 来配置多个服务。
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上一节中,我们使用 `docker service create` 一次只能部署一个服务,使用 `docker-compose.yml` 我们可以一次启动多个关联的服务。
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我们以在 `Swarm` 集群中部署 `WordPress` 为例进行说明。
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```yaml
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version: "3"
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services:
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wordpress:
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image: wordpress
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ports:
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- 80:80
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networks:
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- overlay
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environment:
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WORDPRESS_DB_HOST: db:3306
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WORDPRESS_DB_USER: wordpress
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WORDPRESS_DB_PASSWORD: wordpress
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deploy:
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mode: replicated
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replicas: 3
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db:
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image: mysql
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networks:
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- overlay
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volumes:
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- db-data:/var/lib/mysql
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environment:
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MYSQL_ROOT_PASSWORD: somewordpress
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MYSQL_DATABASE: wordpress
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MYSQL_USER: wordpress
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MYSQL_PASSWORD: wordpress
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deploy:
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placement:
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constraints: [node.role == manager]
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visualizer:
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image: dockersamples/visualizer:stable
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ports:
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- "8080:8080"
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stop_grace_period: 1m30s
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volumes:
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- "/var/run/docker.sock:/var/run/docker.sock"
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deploy:
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placement:
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constraints: [node.role == manager]
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volumes:
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db-data:
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networks:
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overlay:
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```
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在 `Swarm` 集群管理节点新建该文件,其中的 `visualizer` 服务提供一个可视化页面,我们可以从浏览器中很直观的查看集群中各个服务的运行节点。
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在 `Swarm` 集群中使用 `docker-compose.yml` 我们用 `docker stack` 命令,下面我们对该命令进行详细讲解。
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### 部署服务
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部署服务使用 `docker stack deploy`,其中 `-c` 参数指定 Compose 文件名。
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```bash
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$ docker stack deploy -c docker-compose.yml wordpress
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```
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现在我们打开浏览器输入 `任一节点IP:8080` 即可看到各节点运行状态。如下图所示:
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![](image/wordpress.png)
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在浏览器新的标签页输入 `任一节点IP` 即可看到 `WordPress` 安装界面,安装完成之后,输入 `任一节点IP` 即可看到 `WordPress` 页面。
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### 查看服务
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```bash
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$ docker stack ls
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NAME SERVICES
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wordpress 3
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```
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### 移除服务
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要移除服务,使用 `docker stack down`
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```bash
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$ docker stack down wordpress
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Removing service wordpress_db
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Removing service wordpress_visualizer
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Removing service wordpress_wordpress
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Removing network wordpress_overlay
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Removing network wordpress_default
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```
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该命令不会移除服务所使用的 `数据卷`,如果你想移除数据卷请使用 `docker volume rm`
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