Docker 集群Swarm创建和Swarm Web管理
關于Docker Swarm更多的介紹請查看《Docker管理工具-Swarm部署記錄》
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一、環境配置
1、安裝環境
# cat /etc/redhat-release CentOS Linux release 7.3.1611 (Core) # docker version Client:Version: 1.12.3API version: 1.24Go version: go1.6.3Git commit: 6b644ecBuilt: OS/Arch: linux/amd64Server:Version: 1.12.3API version: 1.24Go version: go1.6.3Git commit: 6b644ecBuilt: OS/Arch: linux/amd642、安裝iptables，并關閉firewall防火墻，
# yum install iptables-services -y && systemctl enable iptables && service iptables save # systemctl disable firewalld.service # systemctl stop firewalld.service關閉firewall防火墻，如果不開啟iptables nat，Docker容器將無法正常啟動。
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運行?sudo iptables -L | grep DOCKER?若輸出
DOCKER???? all? --? anywhere???????????? anywhere Chain DOCKER (1 references)則沒問題。
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否則，運行?iptables-save > /etc/sysconfig/iptables?并編輯添加相應的內容：
- *nat :PREROUTING ACCEPT [27:11935] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [598:57368] :POSTROUTING ACCEPT [591:57092] :DOCKER - [0:0] -A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER -A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER -A POSTROUTING -s 172.17.0.0/16 ! -o docker0 -j MASQUERADE COMMIT # Completed on Sun Sep 20 17:35:31 2015 # Generated by iptables-save v1.4.21 on Sun Sep 20 17:35:31 2015 *filter :INPUT ACCEPT [139291:461018923] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [127386:5251162] :DOCKER - [0:0] -A FORWARD -o docker0 -j DOCKER -A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -A FORWARD -i docker0 ! -o docker0 -j ACCEPT -A FORWARD -i docker0 -o docker0 -j ACCEPT COMMIT # Completed on Sun Sep 20 17:35:31 2015
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3、所有主機節點docker開啟2375監聽，docker版本不同，配置方式不一樣
vim /etc/sysconfig/docker
...... OPTIONS='-H 0.0.0.0:2375 -H unix:///var/run/docker.sock' //在OPTIONS參數項后面的''里添加內容?
或者
# cat /usr/lib/systemd/system/docker.service |grep ExecStart ExecStart=/usr/bin/dockerd -H 0.0.0.0:2375 -H unix:///var/run/docker.sock?
重啟docker服務
systemctl daemon-reload ##使配置文件生效 systemctl restart docker?
二、Swarm安裝和集群創建
1、Swarm鏡像下載
# docker pull swarm # docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/swarm latest 36b1e23becab 4 months ago 15.85 MB?
2、創建Swarm
# docker swarm init --advertise-addr 192.168.23.56:2377 Swarm initialized: current node (4cejtuairtof6d0wjq88merwb) is now a manager.To add a worker to this swarm, run the following command:docker swarm join \--token SWMTKN-1-3kntv9pmgo1w2uk4yqk79v0lw0z35uw2k5j6rw7cns2v0xv3tn-2zqnn7e2zf1azaad2teeh9arw \192.168.23.56:2377To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.上面命令執行后，該機器自動加入到swarm集群。這個會創建一個集群token，獲取全球唯一的 token，作為集群唯一標識。后續將其他節點加入集群都會用到這個token值。
其中，--advertise-addr參數表示其它swarm中的worker節點使用此ip地址與manager聯系。命令的輸出包含了其它節點如何加入集群的命令。
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3、添加集群節點
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[root@kbsonlong ~]# docker swarm join \ > --token SWMTKN-1-3kntv9pmgo1w2uk4yqk79v0lw0z35uw2k5j6rw7cns2v0xv3tn-2zqnn7e2zf1azaad2teeh9arw \ > 192.168.23.56:2377 This node joined a swarm as a worker.?
4、查看集群節點
[root@along ~]# docker node list ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4cejtuairtof6d0wjq88merwb * along.party Ready Active Leader 9388mi6e3fnk9l70g24cljhr5 kbsonlong Ready Active [root@along ~]# docker node list ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4cejtuairtof6d0wjq88merwb * along.party Ready Active Leader 9388mi6e3fnk9l70g24cljhr5 kbsonlong Ready Active //將kbsonlong 節點下線。如果要刪除node1節點，命令是"docker node rm --force kbsonlong " [root@along ~]# docker node update --availability drain kbsonlong kbsonlong [root@along ~]# docker node list ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4cejtuairtof6d0wjq88merwb * along.party Ready Active Leader 9388mi6e3fnk9l70g24cljhr5 kbsonlong Ready Drain [root@along ~]# //可以看到kbsonlong節點狀態變為Drain，那么該節點就不會接受task任務分發，就算之前已經接受的任務也會轉移到別的節點上。//再次修改為active狀態（及將下線的節點再次上線） [root@along ~]# docker node update --availability active kbsonlong kbsonlong [root@along ~]# docker node list ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4cejtuairtof6d0wjq88merwb * along.party Ready Active Leader 9388mi6e3fnk9l70g24cljhr5 kbsonlong Ready Active [root@along ~]#?
##關于Swarm更多的命令行操作，請查看《Docker管理工具-Swarm部署記錄》
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三、Swarm 的Web管理（Portainer、Shipyard、Docerkui）
1、Portainer安裝
# docker run -d -p 9000:9000 -v /var/run/docker.sock:/var/run/docker.sock portainer/portainer -d 參數以detach方式運行 -p 將容器工作端口映射至物理機端口 HOST端口:容器端口 -v 將容器目錄掛載(映射)到物理機對應位置,這里指定通訊方式為sock portainer/portainer 為鏡像名稱portainner 也支持用TCP通訊，啟動命令 # docker run -d -p 9000:9000 portainer/portainer -H tcp://<REMOTE_HOST>:<REMOTE_PORT>?
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優點
缺點
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2、Shipyard
一鍵安裝腳本
curl -sSL https://shipyard-project.com/deploy | bash -s注意：由于Shipyard使用shipyard-proxy代理容器，所以需要把docker配置的tcp 0.0.0.0:2375關閉
[root@kbsonlong ~]# docker ps -a |grep shi 7122d3f37464 shipyard/shipyard:latest "/bin/controller --de" About an hour ago Up About an hour 0.0.0.0:8080->8080/tcp shipyard-controller b350b117d76d swarm:latest "/swarm j --addr 172." About an hour ago Up About an hour 2375/tcp shipyard-swarm-agent a7feb0759efe swarm:latest "/swarm m --replicati" About an hour ago Up About an hour 2375/tcp shipyard-swarm-manager 3e784b0b2140 shipyard/docker-proxy:latest "/usr/local/bin/run" About an hour ago Up About an hour 0.0.0.0:2375->2375/tcp shipyard-proxy 49f9700f0811 alpine "sh" About an hour ago Up About an hour shipyard-certs 7fe4c0e821c1 microbox/etcd:latest "/bin/etcd -addr 172." About an hour ago Up About an hour 0.0.0.0:4001->4001/tcp, 0.0.0.0:7001->7001/tcp shipyard-discovery e3750c5de7e2 rethinkdb "rethinkdb --bind all" About an hour ago Up About an hour 8080/tcp, 28015/tcp, 29015/tcp shipyard-rethinkdb [root@kbsonlong ~]#可以看到啟動了7個Shipyard相關的容器
1、shipyard-rethinkdb? ：數據存放
2、shipyard-discovery ：自動發現
3、shipyard-certs：認證
4、shipyard-proxy：代理
5、shipyard-swarm-manager： swarm管理節點
6、shipyard-swarm-agent： swarm 工作節點 work
7、shipyard-controller：shipyard控制臺，即Web頁面
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2、添加Swarm work節點，使用Shipyard時添加Swarm節點有點不一樣
curl -sSL https://shipyard-project.com/deploy | ACTION=node DISCOVERY=etcd://10.0.1.10:4001 bash -s?
ACTION
This controls the action for the deployment. Available options are:
- deploy: Deploy a new Shipyard instance
- upgrade: Upgrade an existing instance (note: you will need to pass the same environment variables as when you deployed to keep the same configuration)
- node: Add current Docker engine as a new Swarm node in the cluster
- remove: Completely removes Shipyard
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DISCOVERY自動發現
etcd://10.0.1.10:4001? 管理節點上的自動發現服務
:8080">:8080">:8080">:8080">http://<server_ip>:8080? admin/shipyard
優點：
缺點
創建的Swarm集群無法使用Swarm service功能
轉載于:https://www.cnblogs.com/adolfmc/p/9007115.html
總結
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