SSH Login Without Password Using ssh-keygen & ssh-copy-id 

 
 
1.)First we need to create Public and Private keys in the host machine. 
Use the following command in the host machine.
 
jsmith@local-host$ ssh-keygen
 
If created correctly, you might find the following output.
Generating public/private rsa key pair.
Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key]
Enter passphrase (empty for no passphrase): [Press enter key]
Enter same passphrase again: [Pess enter key]
Your identification has been saved in /home/jsmith/.ssh/id_rsa.
Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub.
The key fingerprint is:
33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 jsmith@local-host 


2.) You will see the two keys id_rsa and id_rsa.pub created in your home folder in 
which id_rsa.pub is the public key which you need to copy to the destination machines 
home folder 
using the following command.








jsmith@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
jsmith@remote-host's password:
Now try logging into the machine, with "ssh 'remote-host'", and check in:

.ssh/authorized_keys

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


 


 


for example if you need access to destination server as root, use the command 


format as 


 
jsmith@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub root@destinationHostname


 

3.) Login to remote server without password.




jsmith@local-host$ ssh remote-host
Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2
[Note: SSH did not ask for password.]


 


 


 


 


 


 






































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