构建wordpress集群

桃扇骨 2021-11-17 09:52 316阅读 0赞

1、![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1M4d2Fkdw_size_16_color_FFFFFF_t_70]  
2、环境说明：  
Master/nfs服务器:192.168.63.217  
Worker:192.168.63.217  
Worker:192.168.63.216  
3、创建一个nfs挂载目录，用于存放wordpress代码（63.217）：

[root@master ~]#yum install -y nfs-utils   
    [root@master ~]## cat /etc/exports
    /web 192.168.63.0/24(rw,sync,fsid=0)
    [root@master ~]#systemctl enable rpcbind.service    
    [root@master ~]#systemctl enable nfs-server.service    
    [root@master ~]#systemctl start rpcbind.service    
    [root@master ~]#systemctl start nfs-server.service

4、挂载/web目录(worker)：

[root@node2 ~]#yum install -y nfs-utils
    [root@node2 ~]#systemctl enable rpcbind.service
    [root@node2 ~]#systemctl start rpcbind.service
    [root@webstatus ~]# 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）

[root@masterwordpress]# docker p_w_picpath tag lnmp/php:1.0 192.168.63.217:5000/lnmp/php:1.0
    [root@masterwordpress]# docker p_w_picpath tag lnmp/nginx:1.0 192.168.63.217:5000/lnmp/nginx:1.0
    [root@masterwordpress]# docker p_w_picpath tag lnmp/mysql:1.0 192.168.63.217:5000/lnmp/mysql:1.0
    [root@master wordpress]# docker push192.168.63.217:5000/lnmp/php:1.0
    [root@master wordpress]# docker push192.168.63.217:5000/lnmp/nginx:1.0
    [root@master wordpress]# 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：

[root@master~]# 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：  
\[root@node2 ~\]\#docker swarm join --token SWMTKN-1-37fe5tarzcy50mazbe1e3ewyblkfk7xf9kx9ncanz0wx3q70e1-a7wn9tiepd114if6smuiqlez3 192.168.63.217:2377  
7、查看集群的节点状态：

[root@master wordpress]# docker node ls
    ID                           HOSTNAME  STATUS AVAILABILITY  MANAGER STATUS
    e9naz0ctzaaer4bwleruo34x6 *  master   Ready   Active        Leader
    rfcbavxd8yrixximm9e1i6dsn    node1    Ready   Active        
    shrzku0k3xx87526lkkkyrxsi    node2    Ready   Active

8、为了使得Docker swarm集群容器互相通讯，我们先创建一个overlay网络：  
\[root@master docker\]\# 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:

[root@masterwordpress]# 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 
    [root@masterwordpress]# docker service ls

ID NAME MODE REPLICAS IMAGE  
ira3ezabroai php replicated 1/1 192.168.63.217:5000/lnmp/php:1.0  
10、启动nginx service:

[root@masterwordpress]#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:1.0

11、再启动mysql service:

[root@masterwordpress]# 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:1.0

12、我们也可以在复制出一个web service:  
\[root@master wordpress\]\# docker servicescale web=2  
web scaled to 2  
13、看一下我们的容器到底运行在哪个linux主机上呢：

[root@master wordpress]# 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
    #####
    [root@master wordpress]# docker service ps php
    ID                 NAME                IMAGE                              NODE                DESIRED STATE       CURRENT STATE           ERROR               PORTS
    ptxokpvq1b7s       php.1              192.168.63.217:5000/lnmp/php:1.0  master              Running             Running 5 minutes ago                       
    [root@master wordpress]# docker service ps mysql
    ID                  NAME                IMAGE                                NODE                DESIRED STATE       CURRENT STATE           ERROR               PORTS
    zowbxqnr9toi       mysql.1            192.168.63.217:5000/lnmp/mysql:1.0  node2               Running             Running 2 minutes ago                       
    [root@master wordpress]# docker service ps web
    ID                 NAME                IMAGE                                NODE                DESIRED STATE       CURRENT STATE                ERROR               PORTS
    vhk44hij7gnu       web.1              192.168.63.217:5000/lnmp/nginx:1.0  node1               Running             Running 3 minutes ago                            
    u1vdnr0ujzl7       web.2              192.168.63.217:5000/lnmp/nginx:1.0  node2               Running             Running about a minute ago

14、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：  
wKiom1kCx7KhKE6mAAD-az3Of0E450.png

###  ###

wKiom1kCx7KymaRMAAC09aIyIkg356.png  
\#\#\#\#直接到安装完成：  
wKioL1kCyA6RzeYiAADO6Ttre5k995.png  
15、为了测试高可用性，我们把node1节点关闭掉，看容器（坚果云：[www.jianguoyun.com][]）是否转移：  
我们在node1执行关闭docker:  
\[root@node1 web\]\# systemctl stop docker  
16、在master节点上查看一下状态：

[root@master web]# docker node ls
    ID                          HOSTNAME  STATUS  AVAILABILITY MANAGER STATUS
    e9naz0ctzaaer4bwleruo34x6 * master    Ready   Active       Leader
    rfcbavxd8yrixximm9e1i6dsn   node1     Down    Active        
    shrzku0k3xx87526lkkkyrxsi   node2     Ready   Active

17、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：

[root@master web]# docker service ps php
    ID                 NAME                IMAGE                              NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
    ptxokpvq1b7s       php.1              192.168.63.217:5000/lnmp/php:1.0  master              Running             Running 18 minutes ago                       
    [root@master web]# docker service ps mysql
    ID                  NAME                IMAGE                                NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
    zowbxqnr9toi       mysql.1            192.168.63.217:5000/lnmp/mysql:1.0  node2               Running             Running 15 minutes ago                       
    [root@master web]# docker service ps web
    ID                 NAME                IMAGE                                NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
    jqcuqzjdgi9y       web.1              192.168.63.217:5000/lnmp/nginx:1.0  master              Running             Running 2 minutes ago                        
    vhk44hij7gnu         \_web.1          192.168.63.217:5000/lnmp/nginx:1.0  node1               Shutdown            Running 2 minutes ago                        
    u1vdnr0ujzl7       web.2              192.168.63.217:5000/lnmp/nginx:1.0  node2               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：  
wKiom1kCyOeD4KN7AABGKc\_cgQI661.png  
\#\#到处已经完成了，我们可以看到通过Docker swarm构建集群是非常简单的，那么有没有compose可以结合swarm呢？在compose v3版本之后就体现了这个功能的强大。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1M4d2Fkdw_size_16_color_FFFFFF_t_70]: /images/20211116/c20ce45d7bfb4470bbac7cb27501463e.png
[www.jianguoyun.com]: http://www.jianguoyun.com