SSH-PASSWORDESS

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SSH: SSH (SECURE SHELL ) is an Open Source and most trusted protocol that is used to remote login to other Linux Machines.

Scenario: If you would like to connect to another remote host via command line we can use ssh <hostname> to connect to the host by entering username and password.

Command:

server1$ ssh server2

password:

one you have entered the password you will be login to the server2 via command line.

In IT Industry we may need to work with multiple hosts. Entering a password every time connecting to other hosts is a very time-consuming and repetitive task. to overcome this we have a password-less authentication method using ssh keys.

Generating ssh keys:

$ssh-keygen -t rsa (Press Enter for every question asked after executing the command)

This generates the RSA keys id_rsa and id_rsa.pub keys

now you can manually append the authorized_keys on the remote host(server2) with the .pub key on the node(server1) on which you have created the keys.

or run the below command which does the work for you

$ssh-copy-id server2 (Enter the password for one last time Boom now you have set up your password less ssh authentication)






 

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