SOA-C02 Question 34
Single answerYour company hosts a critical e-commerce application on AWS using an Auto Scaling group of EC2 instances behind an Application Load Balancer (ALB). CloudWatch monitoring shows a consistent increase in the 5xx error rates on the ALB over the last hour, and customers report frequent errors when trying to complete purchases. Which action should you take to remediate the issue?
- A
Check the health check configuration of the ALB and verify that the target instances are healthy.
- B
Increase the desired capacity of the Auto Scaling group to handle the additional load.
- C
Investigate the application logs on the EC2 instances to identify potential application-level issues.
- D
Update the ALB listener to redirect 5xx errors to a static error page hosted on Amazon S3.
Show answer and explanation
Correct answer: C
Explanation
5xx errors on an ALB typically point to issues with the backend service (e.g., application or EC2 instances) rather than the load balancer itself. The appropriate remediation step is to investigate the application logs on the EC2 instances to identify the root cause of the errors. Other options either do not address the root cause or only provide temporary workarounds.
- A. Incorrect.
This option may help identify if the 5xx errors are caused by unhealthy instances, but it does not directly address the root cause of the issue.
- B. Incorrect.
Increasing the desired capacity could help with scaling issues, but 5xx errors typically indicate an application or server-side problem rather than a capacity issue.
- C. Correct.
Investigating the application logs on the EC2 instances is the correct first step to identify the root cause of the 5xx errors since they usually indicate a server-side application issue.
- D. Incorrect.
Redirecting 5xx errors to an S3-hosted static page may improve the user experience but does not resolve the issue causing the errors in the first place.