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Error after installing RAC clusterware after adding nodes:

The specified nodes are not clusterable.

The following error was returned by the operating system: null

I have also installed several test rac environments before, and the problems encountered have also been encountered. Previously encountered this problem is the hosts file ghost, so this conditional reflex directly to check this file:

[root@node2 orcl]# more /etc/hosts

# Do not remove the following line, or various programs

# that require network functionality will fail.

127.0.0.1 localhost

10.85.10.119 node1

10.85.10.121 node2

192.168.0.119 node1prv

192.168.0.121 node2prv

10.85.10.122 node1vip

10.85.10.123 node2vip

The first line of hosts of the two nodes: 127.0.0.1 localhost has been modified, and there is no problem.

Google's results are as follows, which helped me a lot..

Alert: The specified nodes are not clusterable. This could be due to one or more of the following reasons:

1. The user performing the install is not configured in an equivalent manner on all nodes.

2. ssh and scp are not configured properly on all nodes.

3. rsh and rcp are not configured properly on all nodes.

Reconstruction checks for user equivalence. I remember that I had tested it when I created it. I thought that the problem could not be here, but after running it again, I found that the problem was still here.

Node1:

[oracle@node1 ~]$ ssh node1 date

[oracle@node1 ~]$ ssh node2 date

[oracle@node1 ~]$ ssh node1prv date

[oracle@node1 ~]$ ssh node2prv date

Node2:

[oracle@node2 ~]$ ssh node1 date

[oracle@node2 ~]$ ssh node2 date

[oracle@node2 ~]$ ssh node1prv date

[oracle@node2 ~]$ ssh node2prv date

On node2, there are two nodes that have not yet run ssh and still need to enter passwords. Problem solved after running ssh. Still careless. There are 2 SSH missing. It's a little sad..

Here is how to establish user equivalence:

1. group add dba oinstall group on two nodes, create oracle user, primary group oinstall, additional groups are dba and disk

#groupadd oinstall

#groupadd dba

#useradd -g oinstall -G dba oracle

#passwd oracle

2. Establishment of equivalent users

At node1:

[root@node1 opt]# su - oracle

[oracle@node1 ~]$ mkdir ~/.ssh

[oracle@node1 ~]$ chmod 700 ~/.ssh

[oracle@node1 ~]$ ssh-keygen -t rsa

[oracle@node1 ~]$ ssh-keygen -t dsa

At node2:

[root@node2 opt]# su - oracle

[oracle@node2 ~]$ mkdir ~/.ssh

[oracle@node2 ~]$ chmod 700 ~/.ssh

[oracle@node2 ~]$ ssh-keygen -t rsa

[oracle@node2 ~]$ ssh-keygen -t dsa

Switch back to node1 and execute:

[oracle@node1 ~]$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

[oracle@node1 ~]$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

Tip: The following command will prompt you to enter the oracle password for node2. Follow the prompt to enter it. If it fails, you can try to execute the command again.

Order.

[oracle@node1 ~]$ scp ~/.ssh/authorized_keys node2:~/.ssh/authorized_keys

[oracle@node1 ~]$ ssh node2 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

[oracle@node1 ~]$ ssh node2 cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

[oracle@node2 ~]$ scp ~/.ssh/authorized_keys node1:~/.ssh/authorized_keys

Make sure that both nodes have node information about each other.

The two machines execute each other to see if they still need to enter the password

[oracle@node1 ~]$ ssh node1 date

[oracle@node1 ~]$ ssh node2 date

[oracle@node1 ~]$ ssh node1prv date

[oracle@node1 ~]$ ssh node2prv date

Switch to node2 execution

[oracle@node2 ~]$ ssh node1 date

[oracle@node2 ~]$ ssh node2 date

[oracle@node2 ~]$ ssh node1prv date

[oracle@node2 ~]$ ssh node2prv date

After building equivalence, you need to enter a password for the first ssh node, and you don't need it for the second time. Therefore, after building equivalence, you must ssh all relevant nodes. If you don't, you will have a cup...

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