DOP-C02 Question 339
Select 2Your team recently updated the configuration of an Amazon EC2 Auto Scaling group to use a new AMI. Shortly after the deployment, several application instances began failing health checks, resulting in degraded performance. As part of your root cause analysis, you need to identify the underlying issue. Which of the following steps should you perform to pinpoint the root cause? (Select TWO.)
- A
Review the Auto Scaling activity history and EC2 instance state transition logs for anomalies.
- B
Analyze the application logs on the failing instances to identify errors or misconfigurations.
- C
Increase the desired capacity of the Auto Scaling group to mitigate the immediate performance issues.
- D
Check the AMI's configuration, including installed software versions and dependencies.
- E
Revert the Auto Scaling group to the previous AMI to restore functionality.
Show answer and explanation
Correct answers: A, B
Explanation
Root cause analysis involves systematically investigating the failure to identify its origin. Examining the Auto Scaling activity history and EC2 instance state transition logs can reveal issues like failed instance launches, while analyzing application logs can uncover errors or misconfigurations. These steps focus on gathering evidence to pinpoint the exact cause rather than simply mitigating symptoms or reverting changes.
- A. Correct.
Correct: Reviewing the Auto Scaling activity history and EC2 instance state transition logs can help identify if the issue is related to instance lifecycle events, such as failed launches or terminations.
- B. Correct.
Correct: Analyzing application logs is critical for identifying root causes related to misconfigurations, software errors, or missing dependencies introduced by the new AMI.
- C. Incorrect.
Incorrect: Increasing the desired capacity addresses the symptoms (performance degradation) but does not help identify or resolve the root cause.
- D. Incorrect.
Incorrect: While checking the AMI configuration is important during testing or pre-deployment, analyzing logs and activity history is more specific to post-deployment troubleshooting.
- E. Incorrect.
Incorrect: Reverting to the previous AMI may restore functionality, but it does not directly contribute to identifying the root cause of the failure.