Today, We will learn how to set up ssh passwordless login in Linux. SSH (Secure SHELL) is an open-source and most trusted network protocol that is used to log in to remote servers for the execution of commands and programs.
Here is the step to Passwordless SSH login:
Step 1: Generate ssh-keygen on source machine
$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/eduguru/.ssh/id_rsa): [Press enter key] Created directory '/home/eduguru/.ssh'. Enter passphrase (empty for no passphrase): [Press enter key] Enter same passphrase again: [Press enter key] Your identification has been saved in /home/eduguru/.ssh/id_rsa. Your public key has been saved in /home/eduguru/.ssh/id_rsa.pub. The key fingerprint is: 5f:ad:40:00:8a:d1:9b:99:b3:b0:f8:08:99:c3:ed:d3 firstname.lastname@example.org The key's randomart image is: +--[ RSA 2048]----+ | ..oooE.++| | o. o.o | | .. . | | o . . o| | S . . + | | . . . o| | . o o ..| | + + | | +. | +-----------------+
Step 2: Copy the ssh id to the remote host
$ ssh-copy-id email@example.com
Step 3: Test the passwordless SSH Login
$ ssh firstname.lastname@example.org