The answer is missing configuration files, because a running process that returns HTTP 503 during CodeDeploy ValidateService failure indicates the application is not fully functional despite the service being up. The health check endpoint is failing due to missing dependencies or configuration files, which prevents the web server from serving traffic correctly, while the CodeDeploy agent logs show no errors and the process itself remains active. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding that ValidateService validates application readiness, not just process existence—a common trap is assuming a running process equals a healthy deployment. Remember the memory tip: "Process up, but 503? Check your config, not your logs."
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group. The deployment fails during the 'ValidateService' lifecycle event. The CloudWatch Agent reports that the target process is running but the health check endpoint returns HTTP 503. The CodeDeploy agent logs show no errors. What is the most likely cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application is not fully functional due to missing configuration files
Option B is correct because the health check is failing (HTTP 503) even though the process is running, indicating the application is not serving traffic properly, likely due to missing dependencies or configuration. Option A is incorrect because CodeDeploy agent logs showed no errors. Option C is incorrect because Auto Scaling group health checks are separate from CodeDeploy's validation. Option D is incorrect because the process is running.
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.
✗
The Auto Scaling group is not healthy
Why it's wrong here
Auto Scaling health checks are not part of ValidateService.
✗
The CodeDeploy agent is not installed on the instances
Why it's wrong here
The agent logs were available, so it is installed.
✓
The application is not fully functional due to missing configuration files
Why this is correct
Process is running but health check fails, suggesting configuration issue.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The target process is not listening on the expected port
Why it's wrong here
The process is running; it might be listening but returning 503.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application is not fully functional due to missing configuration files — Option B is correct because the health check is failing (HTTP 503) even though the process is running, indicating the application is not serving traffic properly, likely due to missing dependencies or configuration. Option A is incorrect because CodeDeploy agent logs showed no errors. Option C is incorrect because Auto Scaling group health checks are separate from CodeDeploy's validation. Option D is incorrect because the process is running.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A DevOps team uses AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment fails with a 'HealthCheckFailed' error. The application is running, but the health check endpoint returns HTTP 500. What should the team do to resolve this issue?
medium
A.Change the deployment configuration to use AllAtOnce to avoid health checks.
B.Increase the health check grace period in the Auto Scaling group.
C.Disable the health check in the CodeDeploy deployment configuration.
✓ D.Modify the application to handle the health check endpoint correctly and return HTTP 200.
Why D: Option A is correct: fix the application to return a healthy status. Option B ignores the issue. Option C does not fix the application. Option D is not possible.
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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
Question Discussion
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