The user manual [1] states that for ec2 instances, on demand, which must be billed for your reserved instances, they must meet four criteria.
- region,
- Availability Zone
- instance type
- and the specified platform
The platform is confusing because I use custom Ubuntu AMI and in the EC2 control panel, my platform field is empty.
When choosing a reserved instance, you can select "Linux / UNIX" and "Linux / UNIX (Amazon VPC)", Red Hat, SUSE, etc.
So how will I charge?
[1] http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/reserved-instances-fundamentals.html
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