3 Steps to Perform SSH Login Without Password Using ssh-keygen & ssh-copy-id
http://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/
* Step 1: Create public and private keys using ssh-key-gen on local-host
* Step 2: Copy the public key to remote-host using ssh-copy-id
* Step 3: Login to remote-host without entering the password