How to create password-less SSH for Linux

Sometimes you might need setting up Password-less SSH for running script or for application where you dont want to use password everytime. Here is a quick method to setup password-less SSH.

Lab Scenerio:

Machine1: 192.168.160.194

Machine2: 192.168.160.197

a. Run this command on Machine1:

#ssh-keygen -t rsa

It will show you this output. Just press Enter throughout the queries asked.

Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:

b. Let’s copy the key to remote Machine2:

#ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.160.197

It will show you the following output.

Now try logging into the machine, with “ssh ‘root@192.168.160.197′”, and check in:

.ssh/authorized_keys

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

c. Now passwordless SSH is ready. Just test by typing this:

#ssh 192.168.160.197