how to reserve a running amazon ec2 instance?

Question

We have a large ec2 instance running in Asia pacific region. We want to reserve that particular instance.In aws management console we see an option to purchase a reserved instance but there seems to be no option to change this instance into a reserved one.Are we missing out on something

Answer 1

Reserved instances can be purchased and AWS will itself start applying the discounted hourly rates to your already running instances, without you having to configure or modify your already running instances.

You just have to make sure that:

• Your reserved instances are in the same availability zones as your already running instances.
• your reserved instances are of the same instance type as your already running instances.