The answer is to configure the Auto Scaling group to use an ELB health check with a sufficient grace period, set up CloudWatch alarms on the failed health check metric, and enable automatic rollback in the CodeDeploy deployment group. This combination works because the ELB health check determines instance readiness, the grace period prevents premature termination during startup, and the CloudWatch alarm triggers the rollback when the health check failure threshold is breached, while the CodeDeploy rollback setting ensures the previous revision is redeployed. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how CodeDeploy’s automatic rollback integrates with Auto Scaling lifecycle hooks and ELB health checks—a common trap is confusing deployment group alarms with instance-level alarms, or forgetting that the grace period must be long enough to avoid false positives. A useful memory tip is “Alarm, Grace, Rollback”: the alarm detects failure, the grace period buys time, and the rollback restores stability.
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 is using AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment is failing because the new instances are not passing the health checks. The team wants to automatically roll back the deployment if health checks fail. Which THREE steps should the team take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a CloudWatch alarm based on the ELB health check metric.
Option A configures rollback. Option B configures alarms. Option C configures health check grace period. Option D is not needed. Option E is not for rollback.
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 a deployment configuration with a high minimum healthy host percentage.
Why it's wrong here
Incorrect: Not directly for rollback.
✓
Create a CloudWatch alarm based on the ELB health check metric.
Why this is correct
Correct: Alarm can trigger rollback.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the deployment group to automatically roll back when a deployment fails.
Why this is correct
Correct: Enables automatic rollback on failure.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the Auto Scaling group to use an ELB health check with a sufficient grace period.
Why this is correct
Correct: Ensures health check is properly configured.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store the deployment artifacts in an S3 bucket with versioning enabled.
Why it's wrong here
Incorrect: Not related to rollback.
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.
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: Create a CloudWatch alarm based on the ELB health check metric. — Option A configures rollback. Option B configures alarms. Option C configures health check grace period. Option D is not needed. Option E is not for rollback.
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 →
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 web application to an Auto Scaling group. After a deployment, some instances fail the health check and are terminated by the Auto Scaling group. What should the DevOps engineer do to prevent this?
hard
A.Configure a CloudWatch alarm to stop the deployment if instances are unhealthy.
B.Modify the deployment configuration to deploy to only one instance at a time.
✓ C.Update the deployment group to use an Elastic Load Balancer and configure health checks.
D.Increase the desired capacity of the Auto Scaling group to tolerate failures.
Why C: Option C is correct because configuring an Elastic Load Balancer (ELB) with health checks in the CodeDeploy deployment group allows CodeDeploy to monitor instance health during deployment. If an instance fails the ELB health check, CodeDeploy can automatically roll back or stop the deployment, preventing the Auto Scaling group from terminating unhealthy instances. This integrates the deployment lifecycle with load balancer health signals, ensuring only healthy instances serve traffic.
Last reviewed: Jun 20, 2026
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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.
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