最近在学习RAC，搭建实验环境后自己乱敲发现一处问题。
node1
[root@node1 bin]# /u01/app/11.2.0/grid/bin/crsctl check cluster
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4529: Cluster Synchronization Services is online
CRS-4533: Event Manager is online
node2
[root@node2 ~]# /u01/app/11.2.0/grid/bin/crsctl check cluster
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4529: Cluster Synchronization Services is online
CRS-4534: Cannot communicate with Event Manager
百度 发现node2 iptables未关闭，
关闭iptables依然出现问题
待续
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第二日
发现node1 iptables也未关闭（为什么，虚拟机问题吗？？？）。
关闭iptables并重启两节点。
恢复正常