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Answer: Maintain a baseline with Reserved Instances and supplement with Spot Instances for additional capacity.
The optimal solution to minimize EC2 costs while ensuring availability is to use Reserved Instances for the baseline level of usage and Spot Instances for any additional capacity required. Reserved Instances provide a lower hourly rate compared to On-Demand Instances, making them cost-effective for predictable workloads. Using Spot Instances for additional capacity during peak times can further reduce costs as they are typically cheaper than On-Demand Instances. Therefore, the correct answer is B.
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A stateless web application is deployed on Amazon EC2 On-Demand Instances with an Application Load Balancer. The application has varying usage patterns: heavy during an 8-hour business day, moderate overnight, and low on weekends. The company seeks a cost-minimizing solution for EC2 without compromising availability. What is the recommended approach?
A
Deploy the entire workload on Spot Instances.
B
Maintain a baseline with Reserved Instances and supplement with Spot Instances for additional capacity.
C
Ensure baseline usage with On-Demand Instances and scale with Spot Instances for extra capacity.
D
Use Dedicated Instances for the baseline and scale with On-Demand Instances for additional needs.
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