In the user guide [1] , it is stated that for your on demand ec2 instances to be billed under your reserved instances, they have to match four criteria.
The Platform is confusing, because I use a custom Ubuntu AMI and in the EC2 Dashboard, my Platform field is blank.
When choosing a Reserved Instance, you can choose from "Linux/UNIX " and "Linux/UNIX ( Amazon VPC ) " , Red Hat , SUSE , etc.
So how will I get charged?
[1] http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/reserved-instances-fundamentals.html
Term: AWS offers Standard RIs for 1-year or 3-year terms. Reserved Instance Marketplace sellers also offer RIs often with shorter terms. AWS offers Convertible RIs for 1-year or 3-year terms.
Reserved Instances offering capacity reservation cannot be shared with linked accounts; they must be used in the account in which they were purchased. Discounts for Reserved Instances purchased on one account are applied to the combined usage for that instance type on the payer account's bill.
For certain services like Amazon EC2 and Amazon RDS, you can invest in reserved capacity. With Reserved Instances, you can save up to 75% over equivalent on-demand capacity. Reserved Instances are available in 3 options – All up-front (AURI), partial up-front (PURI) or no upfront payments (NURI).
Reserved instances is a discount billing concept in which business can obtain significant discounts compared to standard “On Demand” cloud computing prices in return for committing to a specified level of usage. However, the terms under which a Reserved Instances discount is offered vary from provider to provider.
You would choose "Linux/Unix". Flavors of Linux such as Redhat and SUSE include additional licensing fees not charged for other versions of linux, which is why they are considered separate platforms.
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