SSH setup - between 2 linux boxes without passwords

On Nagios Server

I created /home/nagios/.ssh/

root@Nagi:/home/nagios# ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa): /home/nagios/.ssh/id-dsa
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/nagios/.ssh/id-dsa.
Your public key has been saved in /home/nagios/.ssh/id-dsa.pub.
The key fingerprint is:
d2:f1:3b:2e:8a:8c:3a:db:33:81:ec:57:7e:0a:88:37 root@Nagi
The key's randomart image is:
+--[ DSA 1024]----+
|                 |
|                 |
|        .        |
|       . o       |
|..    . S .      |
|o.o  . .   .     |
|o.Eoo     o      |
|.+o=.o ... .     |
|o++oo.+. ..      |
+-----------------+
root@Nagi:/home/nagios#