Password less authentication for SFTP/SSH between two host

Hello Viewer,

Below are the steps to establish password less authentication between two host.

Example :
you are on "machine1.info.company1.com" and you want password less authentication on "machine2.info1.company2.com" for user "shyam"

Follow the below steps:

1) Log in to "machine1.info.company1.com" with user "user1".

2)  Go to below directory:
     cd /home/user1/.ssh/

3) Generate public-private key pair using below command.
     ssh-keygen -t rsa

     Enter file in which to save the key (/home/web/.ssh/id_rsa):Press Enter
     Enter passphrase (empty for no passphrase): Press Enter
     Enter same passphrase again: Press Enter

     Your identification has been saved in /home/web/.ssh/id_rsa.
     Your public key has been saved in /home/web/.ssh/id_rsa.pub.

     Verify the date of the above files.

4) SSH to other machine and perform below steps.
    ssh shyam@machine2.info1.company2.com , enter the password
    cd /home/shyam
    Change .ssh directory to 700 permission
    cd .ssh
    Take the backup of authorized key folder
    Change authorized_keys to 600 permissions
    ctrl+C

5) Execute the below command:
    cat /home/user1/.ssh/id_rsa.pub | ssh shyam@machine2.info1.company2.com 'cat >> .ssh/authorized_keys'

6) Close the current session and again log in to "machine1.info.company1.com" with user "user1"

7) Try  ssh shyam@machine2.info1.company2.com
   
This time it should not ask for the password.

Thanks a lot for your patience!!!

Regards
-Ashish