SOA-C02 Question 35
Select 3Your organization is running a critical web application on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). CloudWatch alarms have recently triggered alerts indicating that CPU utilization is consistently above 80% on the EC2 instances. This is causing performance degradation for end users. What actions can you take to remediate this issue effectively based on the monitoring metrics?
- A
Increase the desired capacity of the Auto Scaling group to add more EC2 instances.
- B
Enable Auto Scaling policies to dynamically scale the number of EC2 instances based on CPU utilization.
- C
Upgrade the instance type in the Auto Scaling group's launch template to a larger instance type with more CPU capacity.
- D
Use AWS Systems Manager to restart the EC2 instances showing high CPU utilization to temporarily resolve the issue.
- E
Configure the Application Load Balancer (ALB) to cache responses and reduce load on the EC2 instances.
Show answer and explanation
Correct answers: A, B, C
Explanation
To remediate high CPU utilization in an Auto Scaling group, you can increase the desired capacity to add more instances, enable Auto Scaling policies for dynamic scaling, or upgrade to larger instance types. These actions directly address the issue and ensure the application remains available and performant. Restarting instances does not address the underlying problem, and caching at the ALB level is not a feasible solution as ALBs do not support response caching.
- A. Correct.
Correct: Increasing the desired capacity will add more EC2 instances, distributing the load and reducing the CPU utilization on individual instances.
- B. Correct.
Correct: Enabling Auto Scaling policies allows the group to dynamically adjust the number of instances based on real-time CPU utilization metrics, providing a sustainable solution.
- C. Correct.
Correct: Upgrading to a larger instance type can help handle more load per instance, reducing CPU utilization issues.
- D. Incorrect.
Incorrect: Restarting EC2 instances may temporarily relieve the issue but doesn't address the root cause of high CPU utilization.
- E. Incorrect.
Incorrect: While caching at the ALB level could reduce some load, ALBs do not natively cache responses. This option is not applicable to the scenario.