12-Docker Swarm(二)：Service的创建维护和水平扩展

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1.wordpress服务创建与水平扩容

在swarm集群的Swarm节点上
创建overlay网络：

[root@swarm-manager ~]# docker network create -d overlay demo

创建mysql服务

docker service create --name mysql --env MYSQL_ROOT_PASSWORD=root --env MYSQL_DATABASE=wordpress --network demo --mount type=volume,source=mysql-data,destination=/var/lib/mysql mysql:5.7.24

创建wordpress服务

 docker service create --name wordpress -p 80:80 --env WORDPRESS_DB_PASSWORD=root --env WORDPRESS_DB_HOST=mysql --network demo wordpress

水平扩容wordpress服务，扩容至6个：

[root@swarm-manager ~]# docker service scale wordpress=6
wordpress scaled to 6
overall progress: 6 out of 6 tasks 
1/6: running   [==================================================>] 
2/6: running   [==================================================>] 
3/6: running   [==================================================>] 
4/6: running   [==================================================>] 
5/6: running   [==================================================>] 
6/6: running   [==================================================>] 
verify: Service converged 

删除wordpress服务：

[root@swarm-manager ~]# docker service rm wordpress
wordpress