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There's an excellent implementation using AWS lambda to manage spot instances at https://github.com/AutoSpotting/AutoSpotting

What's fantastic about the autospotting implementation is:

1. It dynamically replaces existing instances with spot instances just by setting a tag

2. Rather than replacing the instance with a fixed spot instance type, it will choose the cheapest that fits the requirements.

3. If there are no spot instances available that fit the requirements, it will spin up on demand instances until spot instances are available.

If you have experience working with spot then you will know that these are really outstanding features that hopefully amazon will bake-in in the future.



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