Creating an EC2 key pair - Amazon CloudFormation
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Creating an EC2 key pair

The use of some Amazon CloudFormation resources and templates will require you to specify an Amazon EC2 key pair for authentication, such as when you are configuring SSH access to your instances.

Amazon EC2 key pairs can be created with the Amazon Web Services Management Console. For more information, see Amazon EC2 key pairs in the Amazon EC2 User Guide for Linux Instances.