Follow this step from the machine that you want to get access to remote machine
Step 1: Create public and private keys using ssh-key-gen on local-host
patelm@local-host$ [Note: You are on local-host here] patelm@local-host$ ssh-keygenGenerating public/private rsa key pair. Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] Enter passphrase (empty for no passphrase): [Press enter key] Enter same passphrase again: [Pess enter key] Your identification has been saved in /home/patelm/.ssh/id_rsa.Your public key has been saved in /home/patelm/.ssh/id_rsa.pub. The key fingerprint is:f3:58:0d:f8:65:d6:8f:95:8B:11:89:1a:e5:d6:b0:64 patelm@local-host The key's randomart image is: +--[ RSA 2048]----+ | .E.oo | | oo.=o+ .| | . +++o.o.| | o.* + | | S o . . .| | = | | . . | | | | | +-----------------+
Step 2: Copy the public key to remote-host using ssh-copy-idpatelm@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host patelm@remote-host's password: Now try logging into the machine, with "ssh 'remote-host'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting.Note: ssh-copy-id appends the keys to the remote-host’s .ssh/authorized_key.
Step 3: Login to remote-host without entering the passwordpatelm@local-host$ ssh remote-host Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 [Note: SSH did not ask for password.] patelm@remote-host$ [Note: You are on remote-host here]