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Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 496 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional SAP-C02
Question #: 496
Topic #: 1
[All AWS Certified Solutions Architect - Professional SAP-C02 Questions]

A company hosts an application that uses several Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). During the initial startup of the EC2 instances, the EC2 instances run user data scripts to download critical content for the application from an Amazon S3 bucket.

The EC2 instances are launching correctly. However, after a period of time, the EC2 instances are terminated with the following error message: “An instance was taken out of service in response to an ELB system health check failure.” EC2 instances continue to launch and be terminated because of Auto Scaling events in an endless loop.

The only recent change to the deployment is that the company added a large amount of critical content to the S3 bucket. The company does not want to alter the user data scripts in production.

What should a solutions architect do so that the production environment can deploy successfully?

  • A. Increase the size of the EC2 instances.
  • B. Increase the health check timeout for the ALB.
  • C. Change the health check path for the ALB.
  • D. Increase the health check grace period for the Auto Scaling group.
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Suggested Answer: D 🗳️
by zapper1234 at June 25, 2024, 8:22 p.m.
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ebbff63
Highly Voted 10 months ago
Selected Answer: D
D. Increase the health check grace period
upvoted 9 times
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AhmedSalem
Highly Voted 10 months ago
Selected Answer: D
Answer D. Extending the grace period allows the instances more time to complete their startup tasks, including downloading the additional content from S3, before health checks start. This solution does not require altering the user data scripts in production, which aligns with the company’s requirements.
upvoted 7 times
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nimbus_00
Most Recent 4 months, 3 weeks ago
Selected Answer: D
https://docs.aws.amazon.com/autoscaling/ec2/userguide/health-check-grace-period.html#:~:text=In%20the%20console%2C%20by%20default,the%20health%20check%20grace%20period.
upvoted 1 times
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AzureDP900
5 months ago
D is right. Since the EC2 instances are being terminated due to an ELB system health check failure, it's likely that the health checks are timing out while the user data scripts are still running and downloading content from S3. This causes the ALB to think the instance is unhealthy, leading to termination. By increasing the health check grace period for the Auto Scaling group, you give the instances more time to complete their startup process, including the execution of the user data scripts, before considering them healthy or unhealthy. This should prevent the endless loop of launching and terminating EC2 instances due to health check failures.
upvoted 1 times
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JoeTromundo
6 months, 2 weeks ago
Selected Answer: D
Correct answer: D - The grace period in Auto Scaling allows new instances time to finish initialization (like downloading data or running user scripts) before health checks start. By increasing this grace period, you provide more time for the EC2 instances to complete the startup process and avoid premature termination. Incorrect answer: B - This only extends the time the ALB waits for a response on a health check, but if the EC2 instance isn't ready to serve requests due to its long initialization time, it will still fail the health check.
upvoted 1 times
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liuliangzhou
7 months, 2 weeks ago
Selected Answer: B
I prefer B over D: The problem is that EC2 instances need to download content from S3 during the startup process, which may take some time. If ALB's health check is performed during this period and the EC2 instance is unable to respond to the health check request due to incomplete downloads, ALB may consider the instance unhealthy and remove it from the service. This may trigger the auto scaling group to start new instances, creating an endless loop.
upvoted 2 times
AzureDP900
5 months ago
D is right Increasing the health check timeout might allow more time for the user data scripts to run, but it doesn't give the instance a chance to recover and become healthy before termination.
upvoted 1 times
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