Password less authentication between linux servers

Password less authentication between linux servers:-
Source server:-192.168.2.11
Target server:-192.168.2.12

Hostfile entry On both source and target server:

cat /etc/hosts
192.168.2.11 server1.soumya.com server1
192.168.2.12 server2.soumya.com server2

On source server:-

# ssh-keygen -t rsa
# ssh-keygen -t dsa
# cd /root/.ssh
# cat id_rsa.pub >>authorized_keys
# cat id_dsa.pub >>authorized_keys
# scp authorized_keys root@server2:/root/.ssh/

On target server:-
# ssh-keygen -t rsa
# ssh-keygen -t dsa
# cd /root/.ssh
# cat id_rsa.pub >>authorized_keys
# cat id_dsa.pub >>authorized_keys
# scp authorized_keys root@server1:/root/.ssh/


Now lets test if both servers can ssh each other w/o password or not:-

on source server:-
[root@server1 ~]# ssh server2
Last login: Fri May 29 08:32:06 2015 from 192.168.2.50

[root@server1 ~]# ssh server2 date
Fri May 29 08:37:28 IST 2015


on target server:-

[root@server2 ~]# ssh server1
Last login: Fri May 29 08:38:00 2015 from server2.soumya.com

[root@server1 ~]# ssh server1 date
Fri May 29 08:38:14 IST 2015

So we can see both servers can connect each other without prompting for any password.

Happy learning...




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