? ?最近都在忙，久不更新博客了,今天更新下Docker swarm集群和集群容錯測試：

1、如下拓撲：

2、環境說明：

Master/nfs服務器:192.168.63.217 Worker:192.168.63.217 Worker:192.168.63.216

3、創建一個nfs掛載目錄，用于存放wordpress代碼（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、掛載/web目錄(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 ##掛載之后上傳wordpress代碼

5、把我們在Dockerfile構建的鏡像推送到本地倉庫（這一塊可以參考之前的博客，Dockerfile章節）

[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

##為了worker節點下載速度快點，我們建議先docker pull到本地

6、構建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節點上面操作，加入這個集群：

[root@node2?~]#docker?swarm?join??--token?SWMTKN-1-37fe5tarzcy50mazbe1e3ewyblkfk7xf9kx9ncanz0wx3q70e1-a7wn9tiepd114if6smuiqlez3?192.168.63.217:2377

7、查看集群的節點狀態：

[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、為了使得Docker swarm集群容器互相通訊，我們先創建一個overlay網絡：

[root@master?docker]#?docker?network?create?--driver?overlaynginx_network

##注意內核版本要3.18以上，不夠的話要升級

9、隨機創建調度一個9000端口的Php service運行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、啟動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、再啟動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、我們也可以在復制出一個web service:

[root@master?wordpress]#?docker?servicescale?web=2 web?scaled?to?2

13、看一下我們的容器到底運行在哪個linux主機上呢：

[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、我們已經確認所有的容器都已經起起來并且正常運行了，訪問一下web就可以進行80端口的訪問了，192.168.63.217：

###

####直接到安裝完成：

15、為了測試高可用性，我們把node1節點關閉掉，看容器是否轉移：

我們在node1執行關閉docker:

[root@node1?web]#?systemctl?stop?docker

16、在master節點上查看一下狀態：

[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、我們可以看到node1節點已經Down，然后我們的Docker 容器也已經轉移到了別的worker節點上：

[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

##我們可以看到在node1節點上之前運行的容器已經shutdown了，然后轉移到了master和node2上，再次訪問也是不影響的：

##到處已經完成了，我們可以看到通過Docker swarm構建集群是非常簡單的，那么有沒有compose可以結合swarm呢？在compose v3版本之后就體現了這個功能的強大。

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Docker詳情與集群架構部分可以查看http://www.roncoo.com/course/view/3e9d9c48f76f4c698b8349d04b763467

轉載于:https://blog.51cto.com/xiaoluoge/1920377

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