Method to setup SSH password less login using ssh keygen in rhel 7/Centos 7/ Oracle 7 linux step by step guide

Setup SSH passwordless login on Rhel 7 / Centos 7/ Oracle 7 |SSH is an open source and secure network protocol that is used to login remote machine  for execution commands  and run any programs. It is also used to transfer files securely from one system to other system over network using SCP protocol.

Uses of SSH Protocol

•       Providing secure access for users
•       Providing secure file transfer
•       Executing remote commands

How  does  SSH protocol works

The working mechanism maintains the client and server model. Client  initiated the request to the server. Sever send the public keys to the client machine. After that client and server both negotiate the parameters and established a secure channel .After established secure channel  user can login to the remote sever through client.

In this article learn about the  SSH password less  login using  ssh keygen on the Linux server.

Assume that  we have two servers

IPaddress of server1:192.168.56.11

IPaddress of server2:192.168.56.12

We  are going to establish the password less connection  between server 1 and server2.First we generate public key from sever1 using ssh keygen .After generating the public key upload the public key to sever2 into authorized file which is located at .ssh directory and set the necessary permission .

After completed the above step the user from sever1 will connect to server2 without promting the password.

The whole process demonstrate below:

Step1: Create ssh authentication keys on server1

 We are going to create ssh key on server1 using the following command

ssh-keygen -t rsa

              Create ssh authentication keys

Step2: Create .ssh Directory on sever2

We access server2 from server1 using ssh and ceate .ssh directory on server2 using the following command

ssh root@192.168.56.12 mkdir -p .ssh

                       Create .ssh Directory

 Step3:Upload generated public key to server2

We access server2 from server1 using ssh and upload the key which is generated from server1 to sever2 on authorized file which is located at .ssh directory

cat .ssh/id_rsa.pub | ssh root@192.168.56.12 'cat >> .ssh/authorized_keys'

Step4:Set Permission

Set the Permission of .ssh directory and authorized file

ssh root@192.168.56.12 "chmod 700 .ssh; chmod 640 .ssh/authorized_keys"

Step5:Access from server1 to server2 without prompting password

After completing all above steps when we connect to sever2 from sever1 we are not facing any password authentication.

ssh root@192.168.56.12

ssh passwordless login

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