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kyser
kyser

Reputation: 107

AWS Spot Instances : At what price am i billed?

I have a small question on the spot pricing. Let us assume I have placed a max bid of $0.15 for a c3.large spot EC2 instance. And the current price at that time time was $0.08per hour. Eventually in the next hour the spot price dropped to $0.03 per hour. Now my question is at what price will I be charged?

  1. $0.08 for the first hour and $0.03 for the second hour?
  2. $0.08 for my entire usage?

Upvotes: 0

Views: 273

Answers (1)

Anthony Neace
Anthony Neace

Reputation: 26003

Per the documentation for Spot Instances:

Spot instance-hours are billed based on the Spot price at the start of each instance-hour. If your Spot Instance is interrupted in the middle of an instance-hour (because the Spot price exceeded your max bid price), you are not billed for that partial hour of Spot use. (However, if you terminate the Spot instance, you are charged for the partial hour of use.)

The important part there is that spot instance-hours are billed based on the Spot price at the start of each instance-hour.

So if the price dropped to $0.03 during the second hour, but not at the time that the second instance-hour began, then you would be charged $0.08 for the second hour. You would be charged $0.03 for the third hour, assuming the price does not change again.

Upvotes: 1

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