What happen if no spot instance are available ?

Question

I'm going to use spot instance request on my production.
But i have few questions about how it work at specific moments.

Here is my configuration :
Auto-Scaling-Group : Min instance = 2 Max instance = 10   100% spot instance and minimum of 1 on-demand.

What happen when the ASG need to scale up and there is no spot instance available ? Will he wait for spot instance, or will he ask for a on demand instance until a spot is available ?

Answer

According to our [documentation](https://docs.aws.amazon.com/autoscaling/ec2/userguide/launch-template-spot-instances.html), the danger is if you set your maximum price and the spot market exceeds that price, you may not get an instance.

What happen if no spot instance are available ?

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