5 月 162018
 

Docker Swarm集群管理节点的提升和降级

查看集群节点状态,仅有一个管理节点

[root@swarm1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
rlle6k39z3xk82f1wqmjpd4m4 * swarm1 Ready Active Leader 18.03.1-ce
fzi0eoey60bd25cklvt5qg6p5 swarm2 Ready Active 18.03.1-ce
59optctp5n9zvv3lvaifel7bx swarm3 Ready Active 18.03.1-ce
ixqldqaby2jrgfqx7ckjpg0zs swarm4 Ready Active 18.03.1-ce
[root@swarm1 ~]#

查看工作节点仅监听7946端口

[root@swarm4 ~]# netstat -lnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp6 0 0 :::7946 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:25 :::* LISTEN
[root@swarm4 ~]#

提升swarm4为管理节点

[root@swarm1 ~]# docker node promote swarm4
Node swarm4 promoted to a manager in the swarm.
[root@swarm1 ~]#

查看swarm4节点端口监听状态,新增监听2237端口

[root@swarm4 ~]# netstat -lnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp6 0 0 :::2377 :::* LISTEN
tcp6 0 0 :::7946 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:25 :::* LISTEN
[root@swarm4 ~]#

在管理节点查看集群节点状态

降级为工作节点

[root@swarm1 ~]# docker node demote swarm4
Manager swarm4 demoted in the swarm.
[root@swarm1 ~]#

集群管理节点容错数量

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