ssh configuration
ON EACH HOST:
Log in as oracle
$ ssh-keygen –t rsa
$cd .ssh
$cat id_rsa.pub > authorized_keys
$chmod 600 *
Then concatenate all the authorized_keys files into one file of the same name and ensure this is on all the hosts in the .ssh directory with protection of 600.
ON EACH HOST:
Enter the following command changing the hostname to each hostname in the cluster and then changing the hostname to each fully qualified hostname in the cluster.
  $ ssh hostname date
  $ ssh hostname.domainname date
e.g.
n.b. none of these commands should request a password.
 $ssh hostname date
 $ssh hostname.domain date
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