使用Docker swarm构建高可用wordpress集群
最近都在忙，久不更新博客了,今天更新下Docker swarm集群和集群容错测试：1、如下拓扑：2、环境说明：Master/nfs服务器:192.168.63.217 Worker:192.168.63.217 Worker:192.168.63.2163、创建一个nfs挂载目录，用于存放wordpress代码（63.217）：#yum install -y nfs-utils ## cat /etc/exports /web 192.168.63.0/24(rw,sync,fsid=0) #systemctl enable rpcbind.service #systemctl enable nfs-server.service #systemctl start rpcbind.service #systemctl start nfs-server.service4、挂载/web目录（worker）#yum install -y nfs-utils #systemctl enable rpcbind.service #systemctl start rpcbind.service # mount192.168.63.217:/web /web ##挂载之后上传wordpress代码5、把我们在Dockerfile构建的镜像推送到本地仓库（这一块可以参考之前的博客，Dockerfile章节）# docker image tag lnmp/php:1.0 192.168.63.217:5000/lnmp/php:1.0 # docker image tag lnmp/nginx:1.0 192.168.63.217:5000/lnmp/nginx:1.0 # docker image tag lnmp/mysql:1.0 192.168.63.217:5000/lnmp/mysql:1.0 # docker push192.168.63.217:5000/lnmp/php:1.0 # docker push192.168.63.217:5000/lnmp/nginx:1.0 # docker push192.168.63.217:5000/lnmp/mysql:1.0##为了worker节点下载速度快点，我们建议先docker pull到本地6、构建Docker swarm集群63.217操作：# docker swarm init --advertise-addr 192.168.63.217 To add a worker to this swarm, run the following command: docker swarm join \ --tokenSWMTKN-1-37fe5tarzcy50mazbe1e3ewyblkfk7xf9kx9ncanz0wx3q70e1-a7wn9tiepd114if6smuiqlez3\ 192.168.63.217:2377##在worker节点上面操作，加入这个集群：
#docker swarm join--token SWMTKN-1-37fe5tarzcy50mazbe1e3ewyblkfk7xf9kx9ncanz0wx3q70e1-a7wn9tiepd114if6smuiqlez3 192.168.63.217:2377
7、查看集群的节点状态：# docker node ls ID HOSTNAMESTATUS AVAILABILITYMANAGER STATUS e9naz0ctzaaer4bwleruo34x6 *master Ready Active Leader rfcbavxd8yrixximm9e1i6dsn node1 Ready Active shrzku0k3xx87526lkkkyrxsi node2 Ready Active8、为了使得Docker swarm集群容器互相通讯，我们先创建一个overlay网络：# docker network create --driver overlaynginx_network##注意内核版本要3.18以上，不够的话要升级
9、随机创建调度一个9000端口的Php service运行Docker容器:# docker service create --mount type=bind,source=/web/,target=/web/--network nginx_network --name php -p 9000:9000192.168.63.217:5000/lnmp/php:1.0# docker service ls ID NAME MODE REPLICAS IMAGE ira3ezabroai php replicated 1/1 192.168.63.217:5000/lnmp/php:1.010、启动nginx service:# docker service create --mount type=bind,source=/web/,target=/web/ --network nginx_network --name web -p 80:80 192.168.63.217:5000/lnmp/nginx:1.011、再启动mysql service:# docker service create --mounttype=bind,source=/data/,target=/var/lib/mysql/ --network nginx_network --namemysql -p 3306:3306 192.168.63.217:5000/lnmp/mysql:1.012、我们也可以在复制出一个web service:# docker servicescale web=2 web scaled to 213、看一下我们的容器到底运行在哪个linux主机上呢：# docker service ls ID NAME MODE REPLICAS IMAGE ira3ezabroai php replicated 1/1 192.168.63.217:5000/lnmp/php:1.0 kcxqzxwe0dzb mysql replicated 1/1 192.168.63.217:5000/lnmp/mysql:1.0 ufn1n5phtsqn web replicated 2/2 192.168.63.217:5000/lnmp/nginx:1.0###### docker service ps php ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS ptxokpvq1b7s php.1 192.168.63.217:5000/lnmp/php:1.0master Running Running 5 minutes ago # docker service ps mysql ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS zowbxqnr9toi mysql.1 192.168.63.217:5000/lnmp/mysql:1.0node2 Running Running 2 minutes ago # docker service ps web ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS vhk44hij7gnu web.1 192.168.63.217:5000/lnmp/nginx:1.0node1 Running Running 3 minutes ago u1vdnr0ujzl7 web.2 192.168.63.217:5000/lnmp/nginx:1.0node2 Running Running about a minute ago14、我们已经确认所有的容器都已经起起来并且正常运行了，访问一下web就可以进行80端口的访问了，192.168.63.217：#######直接到安装完成：
15、为了测试高可用性，我们把node1节点关闭掉，看容器是否转移：我们在node1执行关闭docker:# systemctl stop docker16、在master节点上查看一下状态：# docker node ls ID HOSTNAMESTATUSAVAILABILITY MANAGER STATUS e9naz0ctzaaer4bwleruo34x6 * master Ready Active Leader rfcbavxd8yrixximm9e1i6dsn node1 Down Active shrzku0k3xx87526lkkkyrxsi node2 Ready Active17、我们可以看到node1节点已经Down，然后我们的Docker 容器也已经转移到了别的worker节点上：# docker service ps php ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS ptxokpvq1b7s php.1 192.168.63.217:5000/lnmp/php:1.0master Running Running 18 minutes ago # docker service ps mysql ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS zowbxqnr9toi mysql.1 192.168.63.217:5000/lnmp/mysql:1.0node2 Running Running 15 minutes ago # docker service ps web ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS jqcuqzjdgi9y web.1 192.168.63.217:5000/lnmp/nginx:1.0master Running Running 2 minutes ago vhk44hij7gnu \_web.1 192.168.63.217:5000/lnmp/nginx:1.0node1 Shutdown Running 2 minutes ago u1vdnr0ujzl7 web.2 192.168.63.217:5000/lnmp/nginx:1.0node2 Running Running 14 minutes ago
##我们可以看到在node1节点上之前运行的容器已经shutdown了，然后转移到了master和node2上，再次访问也是不影响的：
参考内容：http://www.roncoo.com/course/view/3e9d9c48f76f4c698b8349d04b763467
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