Shufengs-iMac:~ wangbo$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/wangbo/.ssh/id_rsa): [enter-return]
Enter passphrase (empty for no passphrase): <span style="font-family: Arial, Helvetica, sans-serif;">[enter-return]</span>
Enter same passphrase again: <span style="font-family: Arial, Helvetica, sans-serif;">[enter-return]</span>
Your identification has been saved in /Users/wangbo/.ssh/id_rsa.
Your public key has been saved in /Users/wangbo/.ssh/id_rsa.pub.
The key fingerprint is:
6e:14:e8:ae:48:2a:ae:29:ac:95:82:8f:8b:cc:1c:df wangbo@Shufengs-iMac.local
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|       .         |
|      . .        |
|     .   .       |
|      . S        |
|.  . . o         |
|+.+   . o        |
|BXo... .         |
|#*o..E           |
+-----------------+

2. Make sure there is ~/.ssh folder on remote server

3. Apend new public key to remote server

Shufengs-iMac:~ wangbo$ cat .ssh/id_rsa.pub | ssh oracle@192.168.0.111 'cat >> .ssh/authorized_keys'
oracle@192.168.0.111's password:

4. Try to login

5. If login still need password you may need to do following steps on remote server

[oracle@ol65 .ssh]$ chmod 644 .ssh/authorized_keys

[oracle@ol65 ~]$ chmod 700 .ssh