AWS Amazon EC2 Spot pricing?

So long as your bid price is above the spot instance market price, you can continue to run whatever spot instances you want, and only pay the market price.

So long as your bid price is above the spot instance market price, you can continue to run whatever spot instances you want, and only pay the market price. However, when the market price goes above your bid price, you lose your instances. Without any warning.

They just terminate. While the spot price rarely spikes, and when it does it tends to come back down again quickly, for many applications the possibility of losing all your instances without warming is unacceptable. You can insulate yourself against that possibility by bidding higher, but then you risk having to pay that much.TL;DR: If your application is tolerant to sudden termination, then spot instances are great.

But there is a risk involved in using them.

Spot on, if your bid price always remains above the spot price. I couldn't find any other explicit mention of when they will terminate your instance. I would have assumed it would be when they would require that capacity for customers willing to pay full charges for the instance, but then again, the spot price could technically go above the on-demand price.

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