Tuesday 6 November 2012

SSH login without password in Linux

Hi to login into Linux System through SSH with out password Follow Below Steps
two systems (Below IP addresses are for Example)
system1 ip : 2.2.2.2
system2 ip : 3.3.3.3

Note: For Below Command don't type any thing Simply press Enter


root@system1:~# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): (Press Enter)
Enter passphrase (empty for no passphrase): (Press Enter)
Enter same passphrase again: (Press Enter)
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
d8:b7:3b:d8:12:19:47:de:43:e9:8b:54:ba:b4:af:c4 root@system1
The key's randomart image is:
+--[ RSA 2048]----+
|           ..    |
|          ...o   |
|          .+* .  |
|       o oo* .   |
|      . S ....    |
|         + +.+.   |
|         oE.o    |
|        ..oo     |
|          o.     |
+-----------------+

root@system1:~# ssh-copy-id  3.3.3.3
root@3.3.3.3's password: 

Now try logging into the machine, with "ssh '3.3.3.3'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

root@system1:~# ssh 3.3.3.3
(If Login success OK,if Login Fail and Got Below Error )

Agent admitted failure to sign using the key.
root@3.3.3.3's password: 

root@system1:~# ssh-add
Identity added: /root/.ssh/id_rsa (/root/.ssh/id_rsa)

Now
root@system1:~# ssh 3.3.3.3
Last login: Wed Nov  7 10:27:23 2012 from 2.2.2.2
root@system2:~#

Success









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