RSA key pair generation
RSA keys are used to avoid the login prompt when you try to SSH to the server. Generating RSA keys is very simple.
Please follow the steps given below.
From the server1,
$ ssh-keygen -t rsa
Press key to accept the default file location of /root/.ssh/id_rsa
Change the permission to 755 to the directory “/root/.ssh/id_rsa”
$ chmod 755 /root/.ssh/id_rsa
Now create a file “/root/.ssh/authorized_keys” on the target system.
$ touch /root/.ssh/authorized_keys
From server1, copy the contents of the file “/root/.ssh/id_rsa.pub” to the file “/root/.ssh/authorized_keys2″ on server2. You can do it using the command “scp” as follows.
$ scp /root/.ssh/id_rsa.pub root@server2:/root/.ssh/authorized_keys
That’s all
Now you can connect the server2 from server1 through SSH without typing the password.
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