How to setup password less ssh login in linux server

SSH is an open-source and most trusted network protocol that is use to login to remote server. It is use to transfer file from one host to remote host over the network using SCP protocol.

In this article , we will discuss how to setup password-less login on RedHat linux, OE linux and solaris.

First of all login on source server 192.168.0.10 and generate pair of public keys using below command.

Source server 192.168.0.10

Destination server 192.168.0.11

Step 1:- Generate public authentication  keys on 192.168.0.10.

[root@backup ~]# ssh-keygen -t rsa

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:

4d:05:39:fc:42:84:b6:e7:29:55:ee:32:dh:8b:ff:19 root@backup.xx-xxxx.com

Step 2:- Create .ssh Directory on – 192.168.0.11

ssh root@192.168.0.11 mkdir -p .ssh

Step 3: Copy/Upload Generated Public Keys to – 192.168.0.11

cat .ssh/id_rsa.pub | ssh root@192.168.0.11 'cat >> .ssh/authorized_keys'

Step 4:- Set permission on 192.168.0.11

The most common issue is permission on remote server. The permissions of the directories should be 

chmod 700 .ssh; chmod 640 .ssh/authorized_keys

Step 5 :- Login from 192.168.0.10 to 192.168.0.11 without password.

$ssh root@192.168.0.11