Create a Key Pair
To use Application Discovery Service with EC2 instances, you must create a key pair. AWS uses public-key cryptography (key pairs) to secure the login information for EC2 instances.
If you haven't created a key pair already, you can create one using the Amazon EC2 console. Note that if you plan to launch instances in multiple regions, you'll need to create a key pair in each region. For more information about regions, see Regions and Availability Zones (Linux).
For more information, see Amazon EC2 Key Pairs.