升級Grid Infrastructure時遭遇[INS-06006] Passwordless SSH connectivity not set up between the following node(s)錯誤，如下圖：

一、環境說明：
DB版本：Oracle 11.2.0.4
OS版本：Redhat 6.4
二、處理方法
1、使用ssh驗證等效性
[grid@jzh03 ~]$ date;ssh jzh03 date
Wed Dec 10 17:06:23 CST 2014
Wed Dec 10 17:06:24 CST 2014

[grid@jzh03 ~]$ date;ssh jzh04 date
Wed Dec 10 17:06:51 CST 2014
Wed Dec 10 17:06:51 CST 2014
結果依然報錯。
2、修改grid使用者密碼
[root@jzh03 Desktop]# passwd grid
Changing password for user grid.
New password:
BAD PASSWORD: it is too short
BAD PASSWORD: is too simple
Retype new password:
passwd: all authentication tokens updated successfully.
結果依然報錯。
3、修改.ssh目錄
[root@jzh03 grid]# chmod 700 .ssh
[root@jzh03 grid]# ls -la
total 44
drwxr-xr-x 5 grid oinstall 4096 Dec 11 10:48 .
drwxr-xr-x. 4 root root 4096 Dec 11 10:21 ..
-rw------- 1 grid oinstall 66 Dec 11 10:59 .bash_history
-rw-r--r-- 1 grid oinstall 18 Aug 29 2012 .bash_logout
-rw-r--r-- 1 grid oinstall 472 Dec 11 10:37 .bash_profile
-rw-r--r-- 1 grid oinstall 124 Aug 29 2012 .bashrc
drwxr-xr-x 2 grid oinstall 4096 Jul 14 2010 .gnome2
-rw-r--r-- 1 grid oinstall 124 Jun 28 2011 .mkshrc
drwxr-xr-x 4 grid oinstall 4096 Nov 13 06:37 .mozilla
drwx------ 2 grid oinstall 4096 Dec 11 10:55 .ssh
-rw------- 1 grid oinstall 646 Dec 11 10:37 .viminfo
結果依然報錯。
4、刪除手工配置的ssh,採用grid infrastructure配置--->依然報錯。
5、上MOS查詢相關文章，發現11.2.0.4 runInstaller: [INS-06006] Passwordless SSH connectivity not set up between the following nodes(s) (文件 ID 1597212.1)，描述如下：
Installing 11.2.0.4 Grid Infrastructure patch set, runInstaller reports error: [INS-06006] Passwordless SSH connectivity not set up between the following nodes(s): [racnode1].

installActions<timestamp>.log

INFO: Preparing to check passwordless SSH Connectivity between nodes: [RACNODE1, RACNODE2] ====>> "hostname" command returns upper case hostname
INFO: Testing passwordless SSH connectivity between the selected nodes. This may take several minutes, please wait...
INFO: OverallStatus of User Equivalence check using CVU is SUCCESSFUL
FINEST: oracle.install.driver.oui.OUISSHSupportManager:Checking whether RACNODE1 is a local node or not.
FINEST: oracle.install.driver.oui.OUISSHSupportManager:Identified RACNODE1 as the local node.
INFO: Finding passwordless SSH connectivity setup on remote nodes
INFO: Preparing remote commands to check passwordless SSH connectivity setup on remote nodes
INFO: Total number of remote commands to be executed is 4
WARNING: Failed while executing remote commands to check SSH connectivity to other nodes..
Refer associated stacktrace #oracle.install.driver.oui.OUISSHSupportManager:964
INFO: Source Node: racnode1 Target Node: racnode1
INFO: Exception: null
INFO: Status log: oracle.install.driver.oui.OUISSHSupportManager$SSHSetupVerificationCommand: 0|ssh: Could not resolve hostname -o FallBackToRsh=no : Temporary failure in name resolution :failed

....

INFO: Remote node(s) not configured for passwordless SSH connectivity : [racnode1]
INFO: Details about the list of remote node(s), not configured for passwordless SSH connectivity
---------------------------------
NODE REMOTE NODES
---------------------------------
racnode1 [racnode1, racnode2] ====>> converted to lower case in the code
---------------------------------

oraInstall<timestamp>.err

---# Begin Stacktrace #---------------------------
ID: oracle.install.driver.oui.OUISSHSupportManager:569
oracle.ops.mgmt.cluster.ClusterException: ssh: -o FallBackToRsh=no : Name or service not known :failedssh: -o FallBackToRsh=no : Name or service not known :failed :successful :successful
at oracle.ops.mgmt.cluster.ClusterConfig.submit(ClusterConfig.java:578)
at oracle.ops.mgmt.cluster.ClusterCmd.submit(ClusterCmd.java:269)
at oracle.ops.mgmt.cluster.ClusterCmd.submit(ClusterCmd.java:294)
at oracle.install.driver.oui.OUISSHSupportManager.getUnconfiguredRemoteNodes(OUISSHSupportManager.java:428)
at oracle.install.driver.oui.OUISSHSupportManager.getSSHConnectivityDetails(OUISSHSupportManager.java:378)
at oracle.install.commons.net.support.SSHSupportManager.getSSHConnectivityDetails(SSHSupportManager.java:181)
at oracle.install.ivw.common.view.SSHSetupPane$8.perform(SSHSetupPane.java:305)
at oracle.install.ivw.common.view.SSHSetupPane$SSHOperation.run(SSHSetupPane.java:336)

---# End Stacktrace #-----------------------------

hostname is in mixed case (in this example upper case)

	$ grep RACNODE /etc/hosts

 10.0.0.101 RACNODE1.US.ORACLE.COM RACNODE1

 10.0.0.102 RACNODE2.US.ORACLE.COM RACNODE2

The bug is fixed in 12.1.0.2

The workaround is to either allow OUI or manually (note 300548.1) setup ssh user equivalence for the installing user, then in command line window, ensure ssh doesn't prompt for password for both real hostname and lower case hostname.

For example:

	$ ssh RACNODE1 date                    ====>> real hostname for node1

 Fri Nov 8 10:01:03 PST 2013      

 $ ssh racnode1 date                    ====>> lower case hostname for node1

 Fri Nov 8 10:01:04 PST 2013

 $ ssh RACNODE2 date

 Fri Nov 8 10:01:05 PST 2013

 $ ssh racnode2 date

 Fri Nov 8 10:01:06 PST 2013

In the case of upgrade, the alternate workaround is to update inventory to set to lower case nodename instead of real hostname:

	$ <OLD_GI_HOME>/oui/bin/runInstaller -updateNodelist ORACLE_HOME=<OLD_GI_HOME> "CLUSTER_NODES={racnode1,racnode2}" CRS=true

Note in above command it's racnode1,racnode2 in lower case despite the hostname is upper case.

原來是個bug，想不到第一次安裝11.2.0.4就遇到bug，將主機名全部改為小寫之後就順利安裝成功了。