Get Started The Ultimate Guide to Amazon EC2 Reserved InstancesThe Ultimate Guide to Amazon EC2 Reserved Instances | 1 Understanding Reserved Instances It’s all very simple, really Amazon Elastic Compute Cloud (EC2) instances are priced in three ways: On-Demand, where you pay full price; Spot, where your price is determined by market availability; and Reserved, where you receive a discount based on a commitment to pay for a certain amount of EC2 usage, whether you use the hours or not. When you purchase an EC2 reservation, you’re essentially purchasing a coupon. Amazon EC2 Reserved Instances (RIs) allow you to make a commitment to AWS to utilize specific instance types in return for a discount on your compute costs. In addition, some RIs have a capacity assurance that gives

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