SSH Passwordless Login Using SSH Keygen in 5 Easy Steps

SSH Client : 10.11.1.x
SSH Remote Host : 10.88.1.x

Step 1: Create Authentication SSH-Kegen Keys on –10.11.1.x

$ 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:
5f:ad:40:00:8a:d1:9b:99:b3:b0:f8:08:99:c3:ed:d3 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 – 10.88.1.x

ssh oracle@10.88.1.X mkdir -p .ssh

The authenticity of host '10.88.1.X (10.88.1.X)' can't be established.
RSA key fingerprint is 45:0e:28:11:d6:81:62:16:04:3f:db:38:02:la:22:4e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.88.1.X' (ECDSA) to the list of known hosts.
oracle@10.88.1.X's password: [Enter Your Password Here]

Step 3: Upload Generated Public Keys to –10.88.1.x

$ cat .ssh/id_rsa.pub | ssh oracle@10.88.1.X 'cat >> .ssh/authorized_keys'

oracle@10.88.1.X's password: [Enter Your Password Here]

Step 4: Set Permissions on –10.88.1.x

 

ssh oracle@10.88.1.X "chmod 700 .ssh; chmod 640 .ssh/authorized_keys"

oracle@10.88.1.X's password: [Enter Your Password Here]

Step 5: Login from 10.11.1.X to 10.88.1.x Server without Password

 ssh oracle@10.88.1.X