Generate and add SSH Key

Generate Your SSH2-RSA Key Pair

The SSH key will be used for connecting to instances as root user.

Open Terminal
Type: ssh-keygen -t rsa
Accept the default path and modify the file name if you wish (Enter file in which to save the key (~/.ssh/id_dsa)
Enter a passphrase and confirm (make sure this is SECURE, and noted somewhere for future reference)
Private and public keys will be generated

Download and run PuTTYgen
Click on Generate button and follow instructions displayed to help PuTTYgen generate your private public key-pair.
Once PuTTYgen finishes generating keys it will display the public key and other details in the application window.
Enter a passphrase and confirm. (make sure this is SECURE, and noted somewhere for future reference)
Click Save public key and save the key with a filename (ex: red5pro_node) on your file system in a secure location (or a common standard folder such as ~/.ssh/ under your user profile). Provide an extension of .pub to the file (public key).
Click Save private key and save the key with the same filename as the public key (ex: red5pro_node) on your file system in a secure location (or a common standard folder such as ~/.ssh/ under your user profile). Provide an extension of .ppk to the file (private key).

Now select SSH Keys from the list.
Click on Add SSH key.
Add a label name for example → red5pro-ssh-key
Copy the public key and paste the contents of the key in the SSH Public Key field.
Click on Add key.