How to login root user from one server to another server on Linux

Access from host-A to host-B without authentication

Step 1:

Login as a root user in host B

Run this command

#ssh-keygen -t rsa

It will create id_rsa and id_rsa.pub files.

We have to copy the content id_rsa.pub file.

Step 2:

Login host-A as root user

#cd .ssh

#vim authorized_keys

Past the content of host-B id_rsa.pub in authorized_keys

Save and exit.

Login from host-A to host-B

First time it will ask accept yes the key

Login from host-A

ssh root@host-B

It will login without any authendication.