The answer is to enable automatic rollback on failure within the CodeDeploy deployment group. This is correct because CodeDeploy provides a native configuration option that, when enabled, automatically reverts the deployment to the last known good revision if the current deployment fails due to unhealthy EC2 instances or any other deployment-level error. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of CodeDeploy’s built-in lifecycle hooks versus external pipeline triggers—a common trap is assuming you need to modify the CodePipeline stage with a manual approval or a Lambda function, but the rollback logic lives entirely within the deployment group settings. Remember that CodeDeploy handles the health check and rollback automatically, so you don’t need to write custom scripts or add extra stages. Memory tip: think “group config, not pipeline stage”—the rollback is set where the deployment happens, not where it’s orchestrated.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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 CodePipeline to deploy a critical web application. The pipeline has a source stage (CodeCommit), a build stage (CodeBuild), and a deploy stage (CodeDeploy). During a recent deployment, the CodeDeploy stage failed because the target EC2 instances were not in a healthy state. The developer needs to ensure that the pipeline automatically rolls back the deployment to the last successful version if the deployment fails. What should the developer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In the CodeDeploy deployment group, enable automatic rollback when a deployment fails.
Option A is correct because CodeDeploy deployment groups have a built-in automatic rollback configuration that can be enabled to revert to the last successful deployment revision when a deployment fails. This feature directly addresses the requirement without requiring additional services or manual steps, as it operates within the CodeDeploy service itself.
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.
✓
In the CodeDeploy deployment group, enable automatic rollback when a deployment fails.
Why this is correct
CodeDeploy supports automatic rollback on failure, which will revert to the last successful deployment.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS CloudFormation to manage the deployment and enable rollback on failure.
Why it's wrong here
CloudFormation rollback is for stack creation/update failures, not for CodeDeploy deployments.
✗
Configure a CloudWatch alarm to trigger a rollback in CodePipeline.
Why it's wrong here
CloudWatch alarms can be used but are not the standard way to automatically rollback on deployment failure.
✗
Modify the CodePipeline stage to include a manual approval step that checks health before proceeding.
Why it's wrong here
Manual approval does not automatically roll back on failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse CodePipeline's built-in rollback capabilities with CodeDeploy's automatic rollback, or incorrectly assume that CloudWatch alarms or manual approvals can directly perform rollbacks without custom logic.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy's automatic rollback works by tracking the last successful deployment revision and, upon failure, re-deploying that revision to the deployment group. This rollback can be triggered by deployment failure, alarm threshold, or both, and it respects the same deployment configuration (e.g., traffic shifting, health checks) as the original deployment. In real-world scenarios, this is critical for zero-downtime deployments where a failed deployment could leave instances in an unhealthy state, and automatic rollback ensures rapid recovery without manual intervention.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: In the CodeDeploy deployment group, enable automatic rollback when a deployment fails. — Option A is correct because CodeDeploy deployment groups have a built-in automatic rollback configuration that can be enabled to revert to the last successful deployment revision when a deployment fails. This feature directly addresses the requirement without requiring additional services or manual steps, as it operates within the CodeDeploy service itself.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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