Learn which AWS service is best for dynamically scaling Amazon EC2 instances based on variable application demand. Explore how Amazon EC2 Auto Scaling can reduce costs and improve performance.
Question
A company’s application has high customer usage at certain times of the day. The company wants to reduce the number of running Amazon EC2 instances when application usage is low. Which AWS service or instance purchase option should the company use to meet this requirement?
A. EC2 Instance Savings Plans
B. Spot Instances
C. Reserved Instances
D. Amazon EC2 Auto Scaling
Answer
D. Amazon EC2 Auto Scaling
Explanation
Amazon EC2 Auto Scaling is an AWS service that can help users reduce the number of running Amazon EC2 instances when application usage is low. Amazon EC2 Auto Scaling allows users to create scaling policies that automatically adjust the number of EC2 instances based on demand or on a schedule.
The correct answer to the question is D. Amazon EC2 Auto Scaling. This service is specifically designed to dynamically adjust the number of Amazon EC2 instances based on real-time application demand, making it the most suitable choice for handling high customer usage during peak times and reducing running instances when demand is low.
Why Amazon EC2 Auto Scaling?
Amazon EC2 Auto Scaling provides several essential features that align with the requirements stated in the question:
- Dynamic Scaling: It automatically adds or removes EC2 instances based on predefined scaling policies, ensuring optimal resource utilization during varying demand periods. This reduces costs by terminating unnecessary instances during low usage periods and improves performance during high demand.
- Predictive Scaling: By analyzing historical traffic patterns, this feature can proactively scale resources in advance of anticipated demand spikes, ensuring seamless application performance.
- Cost Optimization: Since you only pay for the resources you use, Auto Scaling eliminates the need to overprovision resources, significantly reducing operational costs.
- Fault Tolerance and Availability: It monitors instance health and replaces unhealthy instances automatically, ensuring high availability and reliability of applications.
Why Not the Other Options?
A. EC2 Instance Savings Plans: Savings Plans are cost-saving mechanisms for predictable workloads but do not provide dynamic scaling capabilities. They are unsuitable for fluctuating demand as they require a commitment to a consistent usage level3.
B. Spot Instances: While Spot Instances offer significant cost savings, they are not ideal for applications requiring consistent availability because they can be interrupted with little notice. They are better suited for fault-tolerant workloads like batch processing or testing.
C. Reserved Instances: Reserved Instances provide cost savings for long-term, steady-state workloads but lack flexibility for scaling up or down dynamically based on real-time demand.
Amazon EC2 Auto Scaling is the most effective solution for managing variable application demand while optimizing costs and maintaining performance. It ensures that your application has the right amount of compute capacity at all times, making it an indispensable tool for dynamic workloads in AWS environments.
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