Red Hat Linux 6.5 ,  Oracle 12.1.0.2 GI , 两节点， 之前安装过GI及RAC数据库， 由于人为异常将目录权限更改混乱，后手工删除，重新装GI及RAC. 

在安装GI时，检查前提条件的步骤，提示 swap不行，这个可以忽略，还有一个 Domain Sockets 出现warning ,  查询detail信息，提示需要删除
/var/tmp/.oracle 下的一些文件或目录， 忽然想起来，可能这个节点没有执行删除 /var/tmp/.oracle 目录， 导致之前安装时的文件还在，所以出现
warning  ， 按照错误的action提示删除整个 /var/tmp/.oracle 后， 再次检查发现只剩下swap 一项warning了。   

具体报错： 

Perform Prerequisite Checks 

Domain Sockets  warning .....  

Domain Sockets - This task verifies Clusterware domain sockets
  Check Failed on Nodes: [szxtsp137-or] Check Succeeded On Nodes: [szxtsp138-or]  
Verification result of failed node: szxtsp137-or Details: 
-
PRVG-11750 : File "/var/tmp/.oracle/ora_gipc_szxtsp137-or_DBG_OHASD_lock" exists on node "szxtsp137-or". - Cause: The specified file is not expected to be present on the node. - Action: Remove the specified file from the node. 
-
PRVG-11750 : File "/var/tmp/.oracle/ora_gipc_szxtsp137-or_DBG_CTSSD_lock" exists on node "szxtsp137-or". - Cause: The specified file is not expected to be present on the node. - Action: Remove the specified file from the node. 
-
PRVG-11750 : File "/var/tmp/.oracle/ora_gipc_sszxtsp137-orgridszxtsp1-clusterCRFM_SIPC_lock" exists on node "szxtsp137-or". - Cause: The specified file is not expected to be present on the node. - Action: Remove the specified file from the node. 
-
...... 
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PRVG-11750 : File "/var/tmp/.oracle/mdnsd.pid" exists on node "szxtsp137-or". - Cause: The specified file is not expected to be present on the node. - Action: Remove the specified file from the node. 
-
PRVG-11750 : File "/var/tmp/.oracle/ora_gipc_szxtsp137-or_DBG_GIPCD_lock" exists on node "szxtsp137-or". - Cause: The specified file is not expected to be present on the node. - Action: Remove the specified file from the node.