The answer is to add the `s3:PutObject` permission to the CodeBuild service role for the artifact bucket. This error occurs because the CodeBuild project’s IAM service role lacks the specific permission required to write the build output (artifacts) to the designated S3 bucket; without this action, the service cannot complete the upload step, resulting in the "Access Denied" failure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of least-privilege IAM policies for CI/CD pipelines—a common trap is confusing artifact write permissions with source read permissions or misattributing the error to CloudWatch Logs or KMS encryption settings. Remember, CodeBuild needs explicit `s3:PutObject` for its output bucket, while source fetching uses `s3:GetObject` on a different bucket. A helpful memory tip: "Put your artifacts, get your source"—the action verb matches the data flow direction.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. 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 CodeBuild project. The build fails with an error: 'Access Denied: Unable to put object to S3.' The build project has an S3 bucket as the artifact store. What should the engineer do to resolve this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add s3:PutObject permission to the CodeBuild service role for the artifact bucket.
Option A is correct because the CodeBuild service role needs s3:PutObject permission. Option B is wrong because the issue is about writing artifacts, not reading source. Option C is wrong because CloudWatch Logs is for logs, not artifacts. Option D is wrong because KMS is for encryption, not direct write permission.
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.
✓
Add s3:PutObject permission to the CodeBuild service role for the artifact bucket.
Why this is correct
The service role lacks write permission.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable server-side encryption on the artifact bucket.
Why it's wrong here
Encryption does not affect permissions.
✗
Enable CloudWatch Logs for the build project.
Why it's wrong here
Logs do not affect artifact upload.
✗
Add s3:GetObject permission to the CodeBuild service role for the source bucket.
Why it's wrong here
Source bucket may already have read, but error is about put.
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.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add s3:PutObject permission to the CodeBuild service role for the artifact bucket. — Option A is correct because the CodeBuild service role needs s3:PutObject permission. Option B is wrong because the issue is about writing artifacts, not reading source. Option C is wrong because CloudWatch Logs is for logs, not artifacts. Option D is wrong because KMS is for encryption, not direct write permission.
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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