possible reasons that Amazon EC2 will interrupt your Spot Instances

Price – The Spot price is greater than your maximum price.

Capacity – If there are not enough unused EC2 instances to meet the demand for Spot Instances, Amazon EC2 interrupts Spot Instances. The order in which the instances are interrupted is determined by Amazon EC2.

Constraints – If your request includes a constraint such as a launch group or an Availability Zone group, these Spot Instances are terminated as a group when the constraint can no longer be met.

An On-Demand Instance specified in a Spot Fleet cannot be interrupted.

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