The answer is to access the instance via EC2 Instance Connect and check /var/log/cloud-init-output.log. This is correct because cloud-init, the service that processes user data scripts on Linux instances, captures all stdout and stderr output from the script execution and writes it to this specific log file, making it the primary source for debugging script failures. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of EC2 bootstrapping and the distinction between cloud-init logs and other AWS services like CloudTrail or Systems Manager, which do not capture user data execution output. A common trap is assuming CloudWatch Logs automatically collects this data, but the agent must be explicitly configured within the user data script itself. Memory tip: think of "cloud-init-output" as the direct terminal output of your script—if it runs, its story is told in that log.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A DevOps engineer is troubleshooting a failed AWS CloudFormation stack creation. The stack creates an EC2 instance with a user data script that runs a configuration management tool. The instance launches successfully, but the user data script fails. How can the engineer retrieve the user data execution logs to debug the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Access the instance via EC2 Instance Connect and check /var/log/cloud-init-output.log.
Option A is correct. User data scripts run as root, and the output is typically logged to /var/log/cloud-init-output.log on Linux instances. Option B is incorrect because CloudTrail does not capture user data execution logs. Option C is incorrect because Systems Manager Run Command is not used to retrieve logs from user data. Option D is incorrect because CloudWatch Logs agent must be configured in the user data to send logs; it is not automatically enabled.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use AWS CloudTrail to view the user data execution events.
Why it's wrong here
CloudTrail logs API calls, not script execution.
✗
Use AWS Systems Manager Run Command to retrieve the logs remotely.
Why it's wrong here
Run Command is for running commands, not retrieving logs from user data.
✗
Check the CloudWatch Logs group for the instance.
Why it's wrong here
Logs are not automatically sent to CloudWatch; the CloudWatch agent must be installed.
✓
Access the instance via EC2 Instance Connect and check /var/log/cloud-init-output.log.
Why this is correct
Cloud-init logs contain the output of user data scripts.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Run Command is for running commands, not retrieving logs from user data.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Access the instance via EC2 Instance Connect and check /var/log/cloud-init-output.log. — Option A is correct. User data scripts run as root, and the output is typically logged to /var/log/cloud-init-output.log on Linux instances. Option B is incorrect because CloudTrail does not capture user data execution logs. Option C is incorrect because Systems Manager Run Command is not used to retrieve logs from user data. Option D is incorrect because CloudWatch Logs agent must be configured in the user data to send logs; it is not automatically enabled.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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