我在 3 个虚拟机（称为controller1、controller2、controller3）上为 mariadb 创建集群，它们工作正常。
但是，在我重新启动虚拟机后，mariadb 未启动：
[root@controller1 ~]# rabbitmqctl cluster_status
Cluster status of node rabbit@controller1 ...
Error: unable to connect to node rabbit@controller1: nodedown
DIAGNOSTICS
===========
attempted to contact: [rabbit@controller1]
rabbit@controller1:
* connected to epmd (port 4369) on controller1
* epmd reports: node 'rabbit' not running at all
no other nodes on controller1
* suggestion: start the node
current node details:
- node name: 'rabbitmq-cli-24@controller1'
- home dir: /var/lib/rabbitmq
- cookie hash: MpCdZgRS3T3SYr+AfOYx+A==
正常情况下，我们知道如果重新启动集群节点，mariadb 集群也会重新启动。
我的虚拟机系统是 CentOS 7.2，我确信 ntp 日期是相同的。