I'm confused about when you can or cannot hibernate spot instances.
(1.) Under "Hibernation prerequisites," the documentation says that hibernation "is available for On-Demand Instances and Reserved Instances. It is not available for Spot Instances. For more information, see Hibernating interrupted Spot Instances." https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Hibernate.html#hibernating-prerequisites
(2.) But the following article: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-interruptions.html#hibernate-spot-instances
... says that you can set instances to automatically hibernate upon interruption.
What explains this apparent contradiction?
My guess would be that you cannot manually initiate hibernation from a spot instance, but you can configure a spot to hibernate automatically upon interruption. Is that right?
You cannot manually hibernate a Spot Instance.
However, a Spot Instance can be hibernated automatically if the Spot Instance is interrupted and hibernation has been configured.