前言
一、環境
centos 7.3
Docker version 1.12.6
ip | 角色 |
192.168.6.130 | manager |
192.168.6.131 | worker |
192.168.6.132 | worker |
二、集群
2.1、在192.168.6.130中,初始化集群
[root@jacky jacky]# docker swarm init --advertise-addr 192.168.6.130:2377 Swarm initialized: current node (4devzwb6rpimfpteqr17h2jx9) is now a manager. To add a worker to this swarm, run the following command: docker swarm join \ --token SWMTKN-1-5r3ujri3th4038jp7q66zrfo56eqo0sabyage8ahc10121evog-ah9bptj9d7txdu6y91w7qxd81 \ 192.168.6.130:2377 To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions. [root@jacky jacky]#
說明:--advertise-addr 設置監聽Ip和端口號
2.2、初始化完、查看集群上的節點列表
[root@jacky jacky]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
4devzwb6rpimfpteqr17h2jx9 * jacky.localdomain Ready Active Leader
說明:目前只有一個節點,狀態為Ready,是個Leader
2.3、192.168.6.131,加入集群
首先,切換到192.168.6.131,然后輸入
[root@jacky jacky]# docker swarm join \ > --token SWMTKN-1-5r3ujri3th4038jp7q66zrfo56eqo0sabyage8ahc10121evog-ah9bptj9d7txdu6y91w7qxd81 \ > 192.168.6.130:2377 This node joined a swarm as a worker. [root@jacky jacky]#
2.4、192.168.6.132,加入集群
首先,切換到192.168.6.132,然后輸入
[root@jacky jacky]# docker swarm join \ > --token SWMTKN-1-5r3ujri3th4038jp7q66zrfo56eqo0sabyage8ahc10121evog-ah9bptj9d7txdu6y91w7qxd81 \ > 192.168.6.130:2377 This node joined a swarm as a worker. [root@jacky jacky]#
2.5、接着回到192.168.6.130中,查看集群中節點信息
[root@jacky jacky]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4devzwb6rpimfpteqr17h2jx9 * jacky.localdomain Ready Active Leader 5mjtda2uzzu43v2xuxdco5ogr jacky.localdomain Ready Active a8wdtux82dolsbgmv6ff0uu94 jacky.localdomain Ready Active
說明:
AVAILABILITY列:
顯示調度程序是否可以將任務分配給節點:
- Active 意味着調度程序可以將任務分配給節點。
- Pause 意味着調度程序不會將新任務分配給節點,但現有任務仍在運行。
- Drain 意味着調度程序不會向節點分配新任務。調度程序關閉所有現有任務並在可用節點上調度它們。
MANAGER STATUS列
顯示節點是屬於manager或者worker
- 沒有值 表示不參與群管理的工作節點。
- Leader 意味着該節點是使得群的所有群管理和編排決策的主要管理器節點。
- Reachable 意味着節點是管理者節點正在參與Raft共識。如果領導節點不可用,則該節點有資格被選為新領導者。
- Unavailable 意味着節點是不能與其他管理器通信的管理器。如果管理器節點不可用,您應該將新的管理器節點加入群集,或者將工作器節點升級為管理器。
2.6、創建集群網絡overlay
[root@jacky jacky]# docker network create --driver overlay skynet 843z9qb9c6douf7ir7l3iimqn [root@jacky jacky]# docker network ls NETWORK ID NAME DRIVER SCOPE ad5125729239 bridge bridge local 5a15f008fb38 host host local 6echvokyh2m3 ingress overlay swarm 28068704e605 none null local 843z9qb9c6do skynet overlay swarm
可以看到新創建的網絡名稱為skynet,類型為overlay
三、部署測試
3.1、在管理節點中執行
docker service create -p 80:80 --name webserver --replicas 5 httpd
3.2、查看集群中的服務
[root@node1 jacky]# docker service ls ID NAME REPLICAS IMAGE COMMAND 0blhke4vywh8 viz 0/1 manomarks/visualizer 7batkp4zv9f3 portainer 1/1 portainer/portainer -H unix:///var/run/docker.sock 7kw3ovihgqgb webserver 5/5 httpd
3.3、查看集群中的webserver服務
[root@node1 jacky]# docker service ps webserver ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR e0jqrg479muha7ow8bf34rv39 webserver.1 httpd node1.jacky.com Running Running 2 hours ago 23n9df2vww079h5rgkxlri4uy \_ webserver.1 httpd node1.jacky.com Shutdown Complete 2 hours ago 8b8cs13u9yjsoru3ybyzzv9e6 \_ webserver.1 httpd node2.jacky.com Shutdown Rejected 20 hours ago "No such image: httpd:latest" 8lvx0ynaohlcfyp11jgji4m3q webserver.2 httpd node1.jacky.com Running Running 2 hours ago 0q8lrzlybo1exl3bngwwfy386 \_ webserver.2 httpd node1.jacky.com Shutdown Complete 2 hours ago eoq4a2sqx80a0hly6tizt5ucf \_ webserver.2 httpd node3.jacky.com Shutdown Shutdown 4 hours ago 10juv2jp1ay9rjbu5hgw6yhs3 \_ webserver.2 httpd node3.jacky.com Shutdown Failed 20 hours ago "starting container failed: er…" 7xa8uoa8775i5nl0zzi373xbt \_ webserver.2 httpd node3.jacky.com Shutdown Failed 20 hours ago "starting container failed: er…" 6puw8t22w0exgiwqzt5vi8fc1 webserver.3 httpd node1.jacky.com Running Running 2 hours ago 74osfdgl5ovp1c3e5s012b3f6 \_ webserver.3 httpd node1.jacky.com Shutdown Complete 2 hours ago cwzuewjsolewap28ctvy3jxaa \_ webserver.3 httpd node3.jacky.com Shutdown Shutdown 4 hours ago 9bb5q38zqk153uqdex1yfcu4e \_ webserver.3 httpd node3.jacky.com Shutdown Failed 20 hours ago "starting container failed: er…" 1uvoczhsfz5ncp1emdueljwqa \_ webserver.3 httpd node3.jacky.com Shutdown Failed 20 hours ago "starting container failed: er…" 0j9hsq18v3pzoecmrjg0qtynh webserver.4 httpd node1.jacky.com Running Running 2 hours ago dyhyy55xlkm3abw2cqm0k8y6h \_ webserver.4 httpd node1.jacky.com Shutdown Complete 2 hours ago 8dymtjskyxhw5zj0ombpv0pm1 \_ webserver.4 httpd node2.jacky.com Shutdown Shutdown 4 hours ago 1b6u7rtknpgmwyfn3j3p94wm6 \_ webserver.4 httpd node2.jacky.com Shutdown Rejected 20 hours ago "No such image: httpd:latest" 1af72d5vpu1xg3u0qypnvlier \_ webserver.4 httpd node2.jacky.com Shutdown Rejected 20 hours ago "No such image: httpd:latest" 897au9dm88i94l0scg69slu6z webserver.5 httpd node1.jacky.com Running Running 2 hours ago eqt7g4bk6e2kqy6qbnr13gfeh \_ webserver.5 httpd node1.jacky.com Shutdown Complete 2 hours ago 7vq8u2eycraafwzlmcgg1e80d \_ webserver.5 httpd node3.jacky.com Shutdown Shutdown 4 hours ago ehu6f1xun8ha6lw7cyex7jjrw \_ webserver.5 httpd node2.jacky.com Shutdown Shutdown 4 hours ago
3.4、訪問http://192.168.6.130、http://192.168.6.131或http://192.168.6.132
說明:192.168.6.131和192.168.6.132沒有部署httpd也能狗訪問,swarm搭建docker集群測試成功
四、安裝Portainer,圖形化管理docker
4.1、關閉selinux
setenforce 0
4.2、在manager節點中執行,如下:
docker service create \ --name portainer \ --publish 9000:9000 \ --constraint 'node.role == manager' \ --mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \ portainer/portainer \ -H unix:///var/run/docker.sock
4.3、訪問192.168.6.130.9000
五、swarm集群其他操作
5.1、更新節點的可見性狀態
[root@node1 jacky]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4devzwb6rpimfpteqr17h2jx9 * node1.jacky.com Ready Active Leader 5mjtda2uzzu43v2xuxdco5ogr node3.jacky.com Ready Active a8wdtux82dolsbgmv6ff0uu94 node2.jacky.com Ready Active [root@node1 jacky]# docker node update --availability Drain node2.jacky.com node2.jacky.com [root@node1 jacky]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4devzwb6rpimfpteqr17h2jx9 * node1.jacky.com Ready Active Leader 5mjtda2uzzu43v2xuxdco5ogr node3.jacky.com Ready Active a8wdtux82dolsbgmv6ff0uu94 node2.jacky.com Ready Drain [root@node1 jacky]# docker node update --availability Active node2.jacky.com node2.jacky.com [root@node1 jacky]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4devzwb6rpimfpteqr17h2jx9 * node1.jacky.com Ready Active Leader 5mjtda2uzzu43v2xuxdco5ogr node3.jacky.com Ready Active a8wdtux82dolsbgmv6ff0uu94 node2.jacky.com Ready Active [root@node1 jacky]#
5.2、升級或降級節點
您可以將工作程序節點提升為manager角色。這在管理器節點不可用或者您希望使管理器脫機以進行維護時很有用。 類似地,您可以將管理器節點降級為worker角色。
無論您升級或降級節點,您應該始終在群中維護奇數個管理器節點。
- 升級節點
[root@node1 jacky]# docker node promote node3.jacky.com node2.jacky.com [root@node1 jacky]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4devzwb6rpimfpteqr17h2jx9 * node1.jacky.com Ready Active Leader 5mjtda2uzzu43v2xuxdco5ogr node3.jacky.com Ready Active Unreachable a8wdtux82dolsbgmv6ff0uu94 node2.jacky.com Ready Active Reachable
- 降級節點
[root@node1 jacky]# docker node demote node3.jacky.com node2.jacky.com Manager node3.jacky.com demoted in the swarm. Manager node2.jacky.com demoted in the swarm. [root@node1 jacky]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 4devzwb6rpimfpteqr17h2jx9 * node1.jacky.com Ready Active Leader 5mjtda2uzzu43v2xuxdco5ogr node3.jacky.com Ready Active a8wdtux82dolsbgmv6ff0uu94 node2.jacky.com Ready Active
5.3、退出docker swarm集群
在對應的worker節點執行如下命令
[root@node1 jacky]# docker swarm leave
如果想把manager節點上已經退出集群的節點信息刪除,如下:
[root@node1 jacky]# docker node rm node2.jacky.com