Spot Instance interruptions - Amazon Elastic Compute Cloud
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Spot Instance interruptions

You can launch Spot Instances on spare EC2 capacity for steep discounts in exchange for returning them when Amazon EC2 needs the capacity back. When Amazon EC2 reclaims a Spot Instance, we call this event a Spot Instance interruption.

When Amazon EC2 interrupts a Spot Instance, it either terminates, stops, or hibernates the instance, depending on what you specified when you created the Spot request.

Demand for Spot Instances can vary significantly from moment to moment, and the availability of Spot Instances can also vary significantly depending on how many unused EC2 instances are available. It is always possible that your Spot Instance might be interrupted.

An On-Demand Instance specified in an EC2 Fleet or Spot Fleet cannot be interrupted.