Creating subdomain in amazon ec2 instance

Question

I have the instance ec2-xx-xxx-xxx-xxx.ap-southeast-1.compute.amazonaws.com. It is running a bitnami lamp stack.
How do I create a subdomain for this like subDomain.ec2-xx-xxx-xxx-xxx.ap-southeast-1.compute.amazonaws.com?
Is it possible to do such this or should I purchase a domain first?
Thanks

Answer 1

You cannot manage AWS domains. You need to have your own domain first and use Route 53 or any other DNS provider to create an A record pointing to this specific EC2 instance.

Before creating the A record however you will need to provision an Elastic IP and assign it to your EC2. Please keep in mind that every account starts out with only 5 Elastic IPs and if you need more you will have to get in touch with Amazon for approval.