Recipe: Password-less auto-login with SSH


Generate key
============
$ ssh-keygen -t rsa 
Generating public/private rsa key pair. 
Enter file in which to save the key (/home/slynux/.ssh/id_rsa): 
Created directory '/home/slynux/.ssh'. 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/slynux/.ssh/id_rsa. 
Your public key has been saved in /home/slynux/.ssh/id_rsa.pub. 
The key fingerprint is: 
f7:17:c6:4d:c9:ee:17:00:af:0f:b3:27:a6:9c:0a:05 slynux@slynux-laptop 
The key's randomart image is: 
+--[ RSA 2048]----+ 
|           .     | 
|            o . .| 
|     E       o o.| 
|      .     ..oo | 
|       .S .+  +o.| 
|      .  . .=....| 
|     .     +.o...| 
|      . . + o.  .| 
|       ..+       | 
+-----------------+ 


Append key
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$ ssh USER@REMOTE_HOST "cat >> ~/.ssh/authorized_keys" < ~/.ssh/id_rsa.pub
Password: