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建立 Docker swarm 與 Node

Env

  • Master
    • ubuntu 16
    • IP：192.168.15.129
  • Node
    • ubuntu 16
    • IP：192.168.15.130
  • Node
    • ubuntu 16
    • IP：192.168.15.131
每個虛擬機必須安裝 Docker 環境

init Master

itachi@swarm-master:~$ sudo docker swarm init --advertise-addr 192.168.15.129
Swarm initialized: current node (t4eswocpwjpo3479z0w0oectd) is now a manager. # 我是 manager

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-5hmpdgirn7mt0nq7rc9lr2wkpgaj40404h8v4td5as7dz0ltkc-aepc1hnh91ot2dux8dojuh18z 192.168.15.129:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

新增 worker 到 swarm 的 token

docker swarm join --token SWMTKN-1-5hmpdgirn7mt0nq7rc9lr2wkpgaj40404h8v4td5as7dz0ltkc-aepc1hnh91ot2dux8dojuh18z 192.168.15.129:2377

將 Node 加入 token 

itachi@swarm-node01:~$ sudo docker swarm join --token SWMTKN-1-5hmpdgirn7mt0nq7rc9lr2wkpgaj40404h8v4td5as7dz0ltkc-3jc1to2cd73rqh921vahc01vs 192.168.15.129:2377
This node joined a swarm as a manager.
itachi@swarm-node2:~$ sudo docker swarm join --token SWMTKN-1-5hmpdgirn7mt0nq7rc9lr2wkpgaj40404h8v4td5as7dz0ltkc-3jc1to2cd73rqh921vahc01vs 192.168.15.129:2377
This node joined a swarm as a manager.

離開 swarm

docker swarm leave -f

查看 swarm 的各個節點

其中 * 號為目前在哪台機器上使用，Leader 只能有一個，但是可以置換。
itachi@swarm-node2:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd     swarm-master        Ready               Active              Leader              18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4     swarm-node01        Ready               Active              Reachable           18.04.0-ce
xns8cu2c4db8kdjzk2ur8ecf1     swarm-node01        Down                Active              Reachable           18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx *   swarm-node2         Ready               Active              Reachable           18.04.0-ce

查看 node 詳細資料

itachi@swarm-master:~$ sudo docker inspect t4eswocpwjpo3479z0w0oectd

demote 節點

執行完後 MANAGER STATUS 狀態會為空
itachi@swarm-master:~$ sudo docker node demote xns8cu2c4db8kdjzk2ur8ecf1
Manager xns8cu2c4db8kdjzk2ur8ecf1 demoted in the swarm.

移除 node 節點

itachi@swarm-master:~$ sudo docker node rm xns8cu2c4db8kdjzk2ur8ecf1
xns8cu2c4db8kdjzk2ur8ecf1
itachi@swarm-master:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd *   swarm-master        Ready               Active              Leader              18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4     swarm-node01        Ready               Active              Reachable           18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx     swarm-node2         Ready               Active                                  18.04.0-ce

promote 節點

以 master 為範例，當 master demote 時會從新選擇一個 Leader 
itachi@swarm-node01:~$ sudo docker node demote swarm-master
Manager swarm-master demoted in the swarm.
itachi@swarm-node01:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd     swarm-master        Ready               Active                                  18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4 *   swarm-node01        Ready               Active              Reachable           18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx     swarm-node2         Ready               Active              Leader              18.04.0-ce
將 master promote，此時 Leader 並不會變回它
itachi@swarm-node01:~$ sudo docker node promote swarm-master
Node swarm-master promoted to a manager in the swarm.
itachi@swarm-node01:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd     swarm-master        Ready               Active              Reachable           18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4 *   swarm-node01        Ready               Active              Reachable           18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx     swarm-node2         Ready               Active              Leader              18.04.0-ce

Update a node

有時候可能某些節點需要進行維護的工作，所以必須先離線。
此時可以使用 --availability 參數，有三種狀態
  • active
  • pause
  • drain
以 swarm-node01 為例
AVAILABILITY 狀態轉為 Drain
itachi@swarm-node01:~$ sudo docker node update --availability drain swarm-node01
swarm-node01
itachi@swarm-node01:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd     swarm-master        Ready               Active              Leader              18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4 *   swarm-node01        Ready               Drain               Reachable           18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx     swarm-node2         Ready               Active              Reachable           18.04.0-ce
節點維護好使 swarm-node01 上線
AVAILABILITY 狀態轉為 Active
itachi@swarm-master:~$ sudo docker node update --availability active swarm-node01
[sudo] password for itachi:
swarm-node01
itachi@swarm-master:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd *   swarm-master        Ready               Active              Leader              18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4     swarm-node01        Ready               Active              Reachable           18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx     swarm-node2         Ready               Active              Reachable           18.04.0-ce

離開 swarm 群

以 node01 為例
itachi@swarm-node01:~$ sudo docker swarm leave -f
Node left the swarm.
從 node2 查看發現 node01 MANAGER STATUS：Unreachable STATUS：Down
itachi@swarm-node2:~$ sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
t4eswocpwjpo3479z0w0oectd     swarm-master        Ready               Active              Leader              18.04.0-ce
l5ehmx995qoiaw4knawnqz4b4     swarm-node01        Down                Active              Unreachable         18.04.0-ce
6wq3zr5i1f0bvgcf5je6sf4tx *   swarm-node2         Ready               Active              Reachable           18.04.0-ce
那再把 node01 加入 swarm 群中
itachi@swarm-node2:~$ sudo docker swarm join-token worker
To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-5hmpdgirn7mt0nq7rc9lr2wkpgaj40404h8v4td5as7dz0ltkc-aepc1hnh91ot2dux8dojuh18z 192.168.15.130:2377
itachi@swarm-node01:~$ sudo docker swarm join --token SWMTKN-1-5hmpdgirn7mt0nq7rc9lr2wkpgaj40404h8v4td5as7dz0ltkc-aepc1hnh91ot2dux8dojuh18z 192.168.15.130:2377
This node joined a swarm as a worker.

參考資料：
https://shpica.com/docker-swarm/

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