Please note that all the EC2 resources described below need to be allocated in the same availability zone
Amazon allocates EC2 resources (IP addresses, virtual hardware) in specific facilities that are meant to cover different geographic regions (also called availability zones). We support three zones: US East (N. Virginia), US West (Oregon) and US West (N. California).
For more detailed information on creating and using a key pair with your EC2 instances, please see AWS Documentation: EC2 Key Pairs
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