Spot Instance Definition: Spot Instances are spare EC2 compute capacity in the AWS Cloud available to you at savings of up to 90% off compared to On-Demand prices
My Confusions are:
- How this Spare EC2 compute capacity is calculated
- This Spare Capacity calculation is based on the Current Account OR Current Region OR Entire AWS Regions ?
CodePudding user response：
Anybody with an AWS Account can launch an Amazon EC2 instance as a Spot Instance. If there is available capacity for the selected Instance Type and Availability Zone, the Spot Instance will be launched and you will be charged a price that is at the current Spot Price (normally much less than On-Demand prices).
However, AWS can stop/terminate that Spot Instance at any time when they need the capacity for customers who are using On-Demand instances. Therefore, the Spot Instance is not guaranteed to keep running.
You have no visibility into the available capacity or the likelihood that the Spot Instance will be stopped/terminated. If you want to maintain a level of capacity using Spot Instances, then you can use a Spot Fleet - Amazon Elastic Compute Cloud, which can automatically replace Spot Instances when they are stopped/terminated.