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.
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:
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:
The key’s randomart image is:
+–[ RSA 2048]—-+
| ooB …..|
| * B . . .|
| * E + . .|
| + o + . . |
| S + . . |
| . + |
| . . |
b. Let’s copy the key to remote Machine2:
#ssh-copy-id -i ~/.ssh/id_rsa.pub email@example.com
It will show you the following output.
Now try logging into the machine, with “ssh ‘firstname.lastname@example.org′”, and check in:
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: