DOP-C02 Question 342
Select 3You are managing a production environment running on AWS with multiple microservices deployed using Amazon ECS. Recently, one of the services experienced intermittent failures, causing downtime for users. After reviewing the CloudWatch logs, you observe elevated error rates but no clear indications of the root cause. Which combination of actions should you take to perform a thorough root cause analysis and implement a fix?
- A
Enable AWS X-Ray tracing on the ECS service to analyze request flows and latency issues.
- B
Use AWS Config to identify recent configuration changes made to the ECS service or its underlying resources.
- C
Increase the ECS service task count to handle the elevated error rates and prevent downtime.
- D
Configure CloudWatch Alarms to notify you of elevated error rates in real-time.
- E
Review VPC Flow Logs to analyze network connectivity issues between the ECS service and its dependencies.
Show answer and explanation
Correct answers: A, B, E
Explanation
Root cause analysis requires a systematic approach to identifying and understanding the underlying issue. AWS X-Ray tracing helps pinpoint application-level problems, AWS Config helps track configuration changes that might have introduced the issue, and VPC Flow Logs assist in diagnosing network-related issues. Together, these tools provide a comprehensive method for identifying the root cause of the failures. Temporary fixes or monitoring solutions, like increasing task counts or configuring alarms, do not directly contribute to identifying the root cause.
- A. Correct.
AWS X-Ray tracing helps identify problems in distributed systems by analyzing request flows, latency, and dependencies. This is highly effective for isolating performance bottlenecks and errors in microservices.
- B. Correct.
AWS Config provides a detailed history of configuration changes, which can help identify if a recent change triggered the failures.
- C. Incorrect.
Increasing the ECS service task count might temporarily mitigate the issue but does not address the root cause of the failures. This is not a root cause analysis step.
- D. Incorrect.
Configuring CloudWatch Alarms is useful for monitoring and notifying you of issues but does not directly contribute to determining the root cause.
- E. Correct.
VPC Flow Logs can help diagnose network connectivity issues between the ECS service and its dependencies, which may be a potential root cause for the failures.