SSH sem senha

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No RAC do Oracle 11gR2 esta configuração é automática!

rewry@hostA:~> ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/rewry/.ssh/id_rsa):
Created directory '/home/rewry/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/rewry/.ssh/id_rsa.
Your public key has been saved in /home/rewry/.ssh/id_rsa.pub.
The key fingerprint is:
3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A

rewry@hostA:~> ssh rewry@hostB mkdir -p .ssh
rewry@hostB's password:

rewry@hostA:~> cat .ssh/id_rsa.pub | ssh rewry@hostB 'cat >> .ssh/authorized_keys'
rewry@hostB's password:

rewry@hostA:~> ssh rewry@hostB
hostB~>