In this modern world we tend to speak a lot, we all believe that speaking is a leadership quality, while we forget the importance of listening. Let us be very cautious when we talk about listening.
http://girishg.net/art-of-listening/
1. Run ssh-keygen command on SYS1 to generate Public and Private
Key.Now add the content from id_rsa.pub created in SYS1 to all the
other nodes (SYS2 & SYS3) to respective location as below.Private file
(id_rsa) should have permission 600 and should be stored secure in
SYS1 alone.We can also change passphrase of private key by using
command ssh-keygen -p -f ~/.ssh/id_rsa.
http://girishg.net/ssh-password-less-authentication-setup-guide/