I want to make sure that an instance type in a particular Availability Zone is available when I need it. How do I purchase an Amazon Elastic Compute Cloud (Amazon EC2) Reserved Instance that does that?

By default, newly purchased Reserved Instances don't reserve capacity.

To purchase a Reserved Instance that reserves capacity for a specific Availability Zone, follow these steps:

  1. Open the Amazon EC2 console and then choose Reserved Instances.
  2. Choose Purchase Reserved Instances.
  3. In the purchasing menu, in the upper right, select the Only show offerings that reserve capacity box.
  4. Choose the desired instance characteristics from the drop-down menus.
  5. Choose Search.

A column for Availability Zone appears in the search results. These Reserved Instances reserve that capacity for your use in that Availability Zone.

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Published: 2017-05-31

Updated: 2019-01-11