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Question 307 - SOA-C02 discussion

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An application runs on Amazon EC2 instances in an Auto Scaling group. Following the deployment of a new feature on the EC2 instances, some instances were marked as unhealthy and then replaced by the Auto Scaling group. The EC2 instances terminated before a SysOps administrator could determine the cause of the health status changes. To troubleshoot this issue, the SysOps administrator wants to ensure that an AWS Lambda function is invoked in this situation.

How should the SysOps administrator meet these requirements?

A.
Activate the instance scale-in protection setting for the Auto Scaling group. Invoke the Lambda function through Amazon EventBridge (Amazon CloudWatch Events).
Answers
A.
Activate the instance scale-in protection setting for the Auto Scaling group. Invoke the Lambda function through Amazon EventBridge (Amazon CloudWatch Events).
B.
Activate the instance scale-in protection setting for the Auto Scaling group. Invoke the Lambda function through Amazon Route 53.
Answers
B.
Activate the instance scale-in protection setting for the Auto Scaling group. Invoke the Lambda function through Amazon Route 53.
C.
Add a lifecycle hook to the Auto Scaling group to invoke the Lambda function through Amazon EventBridge (Amazon CloudWatch Events).
Answers
C.
Add a lifecycle hook to the Auto Scaling group to invoke the Lambda function through Amazon EventBridge (Amazon CloudWatch Events).
D.
Add a lifecycle hook to the Auto Scaling group to invoke the Lambda function through Amazon Route 53.
Answers
D.
Add a lifecycle hook to the Auto Scaling group to invoke the Lambda function through Amazon Route 53.
Suggested answer: C

Explanation:

To enable troubleshooting of EC2 instances marked as unhealthy before they are terminated by the Auto Scaling group, you can use lifecycle hooks:

Add a Lifecycle Hook: Configure a lifecycle hook in the Auto Scaling group. This hook will hold the instance in a 'wait' state either when it launches or terminates (in this case, when it's about to be terminated due to health check failure).

Integration with Amazon EventBridge (CloudWatch Events): Set up the lifecycle hook to send an event to EventBridge (formerly CloudWatch Events) when an instance is in the termination lifecycle state.

Invoke Lambda Function: Configure EventBridge to trigger an AWS Lambda function when it receives the termination lifecycle event from the Auto Scaling group. This Lambda function can then perform necessary diagnostics, logging, or data capture activities on the instance before it's terminated.

This configuration allows the SysOps administrator to perform necessary investigations on why instances were marked unhealthy before they are automatically replaced, offering a chance to diagnose and potentially correct underlying issues.

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asked 16/09/2024
Aleksei Chernikov
47 questions
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