- A
Set the deployment configuration to 'AllAtOnce' and enable termination of the original task set
Why wrong: The 'AllAtOnce' deployment configuration is not valid for ECS blue/green deployments. ECS blue/green uses 'Canary' or 'Linear' or custom configurations based on traffic shifting. 'AllAtOnce' is for Lambda or EC2/On-Premises compute platforms. Also, termination of the original task set is done after success, not on failure.
- B
Define a blue/green deployment using an AppSpec file with a 'Hooks' section to specify a 'BeforeAllowTraffic' hook that checks health. If the check fails, CodeDeploy automatically rolls back.
Why wrong: Hooks can be used to run validation scripts, but automatic rollback on failure is configured separately in the deployment group under 'Rollback configuration'. The hooks themselves do not trigger a rollback; they can cause the deployment to fail, but the rollback behavior must be explicitly enabled.
- C
Set the deployment group's 'Rollback configuration' to automatically roll back failed deployments and configure the 'Deployment configuration' to terminate the original task set on success, but keep it on failure.
By enabling automatic rollback in the deployment group, CodeDeploy will automatically roll back to the original task set if the deployment fails. The 'terminate original task set on success' setting ensures that after a successful deployment, the old task set is terminated. The rollback configuration handles the failure case by terminating the new task set and keeping the original.
- D
Use a manual approval step in the pipeline to decide whether to terminate the new task set.
Why wrong: A manual approval step does not provide automatic rollback on failure. It requires human intervention and does not automatically terminate the new task set on failure.
Quick Answer
The correct configuration is to set the deployment group’s rollback configuration to automatically roll back failed deployments and adjust the deployment configuration to terminate the original task set only on success, keeping it on failure. This works because CodeDeploy for ECS blue/green deployments uses two task sets: the original (serving traffic) and the new (being tested). By default, the original task set is terminated after the new one succeeds, but if you configure it to keep the original on failure and enable automatic rollback, CodeDeploy will abort the new task set and redirect traffic back to the original, ensuring zero manual intervention. On the AWS Certified Developer Associate DVA-C02 exam, this tests your understanding of CodeDeploy’s lifecycle hooks and rollback triggers—a common trap is confusing the deployment configuration (which controls task set termination) with the rollback configuration (which triggers the reversal). Memory tip: “Keep the old on fail, kill the old on success” to remember the termination behavior.
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 developer is deploying a microservice using AWS CodeDeploy with an Amazon ECS compute platform. The service must be updated with a blue/green deployment strategy. The developer wants to ensure that if the deployment fails, the new task set is automatically terminated and the original task set continues to serve traffic. Which configuration should the developer set?
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
Set the deployment group's 'Rollback configuration' to automatically roll back failed deployments and configure the 'Deployment configuration' to terminate the original task set on success, but keep it on failure.
Option C is correct because AWS CodeDeploy for Amazon ECS blue/green deployments allows you to configure automatic rollback on failure within the deployment group settings. By enabling 'Rollback configuration' to automatically roll back failed deployments and setting the 'Deployment configuration' to terminate the original task set only on success (keeping it on failure), you ensure that if the deployment fails, the new task set is automatically terminated and the original task set continues to serve traffic. This directly meets the requirement without manual intervention.
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.
- ✗
Set the deployment configuration to 'AllAtOnce' and enable termination of the original task set
Why it's wrong here
The 'AllAtOnce' deployment configuration is not valid for ECS blue/green deployments. ECS blue/green uses 'Canary' or 'Linear' or custom configurations based on traffic shifting. 'AllAtOnce' is for Lambda or EC2/On-Premises compute platforms. Also, termination of the original task set is done after success, not on failure.
- ✗
Define a blue/green deployment using an AppSpec file with a 'Hooks' section to specify a 'BeforeAllowTraffic' hook that checks health. If the check fails, CodeDeploy automatically rolls back.
Why it's wrong here
Hooks can be used to run validation scripts, but automatic rollback on failure is configured separately in the deployment group under 'Rollback configuration'. The hooks themselves do not trigger a rollback; they can cause the deployment to fail, but the rollback behavior must be explicitly enabled.
- ✓
Set the deployment group's 'Rollback configuration' to automatically roll back failed deployments and configure the 'Deployment configuration' to terminate the original task set on success, but keep it on failure.
Why this is correct
By enabling automatic rollback in the deployment group, CodeDeploy will automatically roll back to the original task set if the deployment fails. The 'terminate original task set on success' setting ensures that after a successful deployment, the old task set is terminated. The rollback configuration handles the failure case by terminating the new task set and keeping the original.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a manual approval step in the pipeline to decide whether to terminate the new task set.
Why it's wrong here
A manual approval step does not provide automatic rollback on failure. It requires human intervention and does not automatically terminate the new task set on failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'Rollback configuration' with hook-based health checks, not realizing that hooks alone do not trigger automatic rollback—you must explicitly enable rollback in the deployment group settings.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy for ECS blue/green deployments uses an 'original' and 'replacement' task set managed by Amazon ECS. The 'Rollback configuration' triggers a CloudWatch event when a deployment fails, which then instructs CodeDeploy to stop the replacement task set and redirect traffic back to the original. The 'Deployment configuration' setting (e.g., 'CodeDeployDefault.ECSAllAtOnce') determines when to terminate the original task set—only after the replacement is healthy and traffic is shifted. In a real-world scenario, if a health check fails during the 'AfterAllowTraffic' hook, the rollback configuration ensures the new task set is terminated and the original remains active, preventing downtime.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: Set the deployment group's 'Rollback configuration' to automatically roll back failed deployments and configure the 'Deployment configuration' to terminate the original task set on success, but keep it on failure. — Option C is correct because AWS CodeDeploy for Amazon ECS blue/green deployments allows you to configure automatic rollback on failure within the deployment group settings. By enabling 'Rollback configuration' to automatically roll back failed deployments and setting the 'Deployment configuration' to terminate the original task set only on success (keeping it on failure), you ensure that if the deployment fails, the new task set is automatically terminated and the original task set continues to serve traffic. This directly meets the requirement without manual intervention.
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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Last reviewed: Jun 11, 2026
This DVA-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 DVA-C02 exam.
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