docker swarm 删除节点重新加入

获取node信息

docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
j52o5frhmphiksqz0xq1mkbbh *   node1               Ready               Active              Leader              18.09.7
nq6v8dog0xzgpzx51x7bv59bp     node2               Ready               Active                                  18.09.7
6whtoqrhkzv3ax4xy9ab20gmy     node3               Ready               Active                                  18.09.7

让 node3 离开，排空 node3 的容器（在 master 上操作）

docker node update --availability drain 6whtoqrhkzv3ax4xy9ab20gmy

让 node3 主动离开集群，让节点处于down状态 （在 node3 上操作）

docker swarm leave

删除 node节点（在 master 上操作）

docker node rm 6whtoqrhkzv3ax4xy9ab20gmy

添加删除节点

[root@k8s-node1 ~]#  docker swarm join     --token SWMTKN-1-1f349i4b2etn0ods4l2q03dcr2l25qdmb5u9472uv2s015i9pr-1mum48hmekeqgbs55lbh536ql     10.0.23.156:2377
Error response from daemon: This node is already part of a swarm. Use "docker swarm leave" to leave this swarm and join another one.

报错是之前删除node是直接rm没有 执行排空、制动离开

解决办法：

要加入的node上执行
[root@k8s-node1 ~]# docker swarm leave
Node left the swarm.

在执行加入集群

[root@k8s-node1 ~]# docker swarm join     --token SWMTKN-1-1f349i4b2etn0ods4l2q03dcr2l25qdmb5u9472uv2s015i9pr-1mum48hmekeqgbs55lbh536ql     10.0.23.156:2377
This node joined a swarm as a manager.

master上执行就可以看到了

如token忘了可以执行获取token（master上操作）

[root@k8s-master1 ]# docker swarm join-token manager 
To add a manager to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-1f349i4b2etn0ods4l2q03dcr2l25qdmb5u9472uv2s015i9pr-1mum48hmekeqgbs55lbh536ql \
    10.0.23.156:2377