Answer Posted / jani

Step 1: Create Authentication SSH-Kegen Keys on – (192.168.1.1)
First login into server 192.168.1.1 with user tecmint and generate a pair of public keys using following command.
[tecmint@tecmint.com ~]$ ssh-keygen -t rsa

Generating public/private rsa key pair.
Enter file in which to save the key (/home/tecmint/.ssh/id_rsa): [Press enter key]
Created directory '/home/tecmint/.ssh'.
Enter passphrase (empty for no passphrase): [Press enter key]
Enter same passphrase again: [Press enter key]
Your identification has been saved in /home/tecmint/.ssh/id_rsa.
Your public key has been saved in /home/tecmint/.ssh/id_rsa.pub.
The key fingerprint is:
af:bc:25:72:d4:04:65:d9:5d:11:f0:eb:1d:89:50:4c tecmint@tecmint.com
The key's randomart image is:
+--[ RSA 2048]----+
| ..oooE.++|
| o. o.o |
| .. . |
| o . . o|
| S . . + |
| . . . o|
| . o o ..|
| + + |
| +. |
+-----------------+
Step 2: Create .ssh Directory on – 192.168.1.2
Use SSH from server 192.168.1.1 to connect server 192.168.1.2 using sheena as user and create .ssh directory under it, using following command.
[tecmint@tecmint ~]$ ssh sheena@192.168.1.2 mkdir -p .ssh

The authenticity of host '192.168.1.2 (192.168.1.2)' can't be established.
RSA key fingerprint is d6:53:94:43:b3:cf:d7:e2:b0:0d:50:7b:17:32:29:2a.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.2' (RSA) to the list of known hosts.
sheena@192.168.1.2's password: [Enter Your Password Here]
Step 3: Upload Generated Public Keys to – 192.168.1.2
Use SSH from server 192.168.1.1 and upload new generated public key (id_rsa.pub) on server 192.168.1.2 under sheena‘s .ssh directory as a file name authorized_keys.
[tecmint@tecmint ~]$ cat .ssh/id_rsa.pub | ssh sheena@192.168.1.2 'cat >> .ssh/authorized_keys'

sheena@192.168.1.2's password: [Enter Your Password Here]
Step 4: Set Permissions on – 192.168.1.2
Due to different SSH versions on servers, we need to set permissions on .ssh directory and authorized_keys file.
[tecmint@tecmint ~]$ ssh sheena@192.168.1.2 "chmod 700 .ssh; chmod 640 .ssh/authorized_keys"

sheena@192.168.1.2's password: [Enter Your Password Here]
Step 5: Login from 192.168.1.1 to 192.168.1.2 Server without Password
From now onwards you can log into 192.168.1.2 as sheena user from server 192.168.1.1 as tecmint user without password.
[tecmint@tecmint ~]$ ssh sheena@192.168.1.2

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