- A
Increase the health check grace period in the Auto Scaling group.
Why wrong: Grace period only delays health checks, does not prevent termination of old instances.
- B
Add a manual approval step before the deploy stage.
Why wrong: Manual approval does not solve the rollback failure.
- C
Configure the pipeline to deploy to a new Auto Scaling group each time.
Why wrong: This adds complexity and does not guarantee rollback success.
- D
Use a blue/green deployment strategy in CodeDeploy to keep the old instances running until the new ones pass health checks.
Blue/green deployment preserves the old environment for rollback.
Question 824 of 1,750
Using Blue/Green Deployment in CodeDeploy to Preserve Old Instances for Rollback
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 team uses AWS CodePipeline to deploy a web application. The pipeline has a deploy stage that uses CodeDeploy to deploy to an Auto Scaling group. During deployment, the new instances fail health checks and the deployment rolls back. However, the rollback also fails because the old instances have been terminated. What should the team do to avoid this issue?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a blue/green deployment strategy in CodeDeploy to keep the old instances running until the new ones pass health checks.
Option D is correct because a blue/green deployment strategy in CodeDeploy keeps the old instances running until the new instances pass health checks, preventing the rollback failure due to terminated instances. Option A is incorrect: increasing the health check grace period only delays health checks but does not solve the root cause of unhealthy instances. Option B is incorrect: a manual approval step before deployment does not affect the rollback mechanism. Option C is incorrect: deploying to a new Auto Scaling group does not inherently keep old instances alive; without blue/green, the old instances would still be terminated during the deployment.
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.
- ✗
Increase the health check grace period in the Auto Scaling group.
Why it's wrong here
Grace period only delays health checks, does not prevent termination of old instances.
- ✗
Add a manual approval step before the deploy stage.
Why it's wrong here
Manual approval does not solve the rollback failure.
- ✗
Configure the pipeline to deploy to a new Auto Scaling group each time.
Why it's wrong here
This adds complexity and does not guarantee rollback success.
- ✓
Use a blue/green deployment strategy in CodeDeploy to keep the old instances running until the new ones pass health checks.
Why this is correct
Blue/green deployment preserves the old environment for rollback.
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.
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.
- →
Resilient Cloud Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a blue/green deployment strategy in CodeDeploy to keep the old instances running until the new ones pass health checks. — Option D is correct because a blue/green deployment strategy in CodeDeploy keeps the old instances running until the new instances pass health checks, preventing the rollback failure due to terminated instances. Option A is incorrect: increasing the health check grace period only delays health checks but does not solve the root cause of unhealthy instances. Option B is incorrect: a manual approval step before deployment does not affect the rollback mechanism. Option C is incorrect: deploying to a new Auto Scaling group does not inherently keep old instances alive; without blue/green, the old instances would still be terminated during the deployment.
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.
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 →
Same concept, more angles
1 more ways this is tested on DOP-C02
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 company uses AWS CodeDeploy to deploy a new version of an application to EC2 instances. They want to minimize downtime and roll back quickly if the deployment fails. Which deployment type should they use?
easy- A.Canary deployment
- B.Linear deployment
- ✓ C.Blue/green deployment
- D.In-place deployment
Why C: Blue/green deployment creates two separate environments (blue and green) and shifts traffic from the old to the new after testing. This minimizes downtime because traffic is switched instantly, and rollback is achieved by reverting traffic to the original environment. Option A (Canary) is a traffic shifting pattern used within blue/green deployments, not a standalone deployment type that offers immediate rollback. Option B (Linear) is also a traffic shifting pattern for blue/green. Option D (In-place) updates existing instances, causing downtime during deployment and requiring a manual rollback process.
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Last reviewed: Jun 20, 2026
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.
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