An application runs exclusively on Amazon EC2 Spot Instances within an Auto Scaling group that also uses scheduled scaling actions. However, instances frequently fail to start on schedule and are interrupted multiple times per day. What change will help ensure instances launch reliably at scheduled times and experience fewer interruptions?
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Correct answer: Use the capacity-optimized allocation strategy for Spot and include a wider set of instance types in the Auto Scaling group..
Why this is the answer
The capacity-optimized allocation strategy for Spot Instances helps reduce interruptions by launching instances in Spot capacity pools that are least likely to be interrupted. Combining this with a wider set of instance types gives the Auto Scaling group more options to choose from, increasing the likelihood of finding available capacity and further reducing interruptions. Using the lowest-price strategy prioritizes cost over availability, making interruptions more likely. Increasing instance sizes alone doesn't guarantee availability or fewer interruptions; it might even limit available capacity if larger instances are scarce.
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