Many of you guys have different accounts on different systems on linux .. and you might log on from one system to other system regularly . like me. But each time you login it asks for a password and some of you might not want this as you have to type the password each and every time and this is unnecessary effort . So here is a method you can use for login in ssh shells without a password .
Suppose you want to login from system A to system B on user X. Then you might try these commands .. But you need your password of user X at system B once .. if you have it then type the following commands on system A ..
[user@A]ssh-keygen -t rsa [enter]
RSA here is the type of encryption used .. you can have RSA as well as DSA on most standard unix systems.
it will give the following output
Generating public/private rsa key pair.
Enter file in which to save the key (/home/ajay/.ssh/id_rsa): [enter]
Enter passphrase (empty for no passphrase):[enter]
Enter same passphrase again:[enter]
Your identification has been saved in id_rsa.
our public key has been saved in id_rsa.pub.
The key fingerprint is:
ef:b8:fd:d8:de:63:d2:f0:ea:3b:ba:1b:ad:e9:b6:ce user@localhost.localdomain
[user@A]
dont worry about it now run the command
[user@A]scp ~/.ssh/id_rsa.pub X@B:.ssh/authorized_keys2 [enter]
X@B’s password: ******* [enter]
give it the password ..
you are done .. now each time you login frm system A to system B using user X it wont ask you for password .. But be careful as someone else might login to ur private account on B once it gets access to A ..Nyways yeah it saves a lot of work specially for those who keep long and strong passwords for their accounts ..
