The answer is AWS CodeDeploy with a blue/green deployment configuration. This is the correct choice because CodeDeploy natively orchestrates blue/green deployments for Amazon ECS on Fargate, automatically shifting traffic from the old blue task set to the new green task set through your Application Load Balancer. It continuously monitors health checks during the deployment and triggers an automatic rollback if those checks fail, meeting the requirement for zero manual intervention. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how CodeDeploy integrates with ECS and ALB for safe, automated releases—a common trap is assuming you need to manually manage task sets or use a separate rollback service. Remember the mnemonic: CodeDeploy = Canary, Blue/Green, and Rollback, all in one service.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 microservices application on Amazon ECS using Fargate. The application uses an Application Load Balancer (ALB) to distribute traffic. The developer needs to perform a blue/green deployment with automatic rollback if health checks fail. What should the developer use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS CodeDeploy with a blue/green deployment configuration.
AWS CodeDeploy natively supports blue/green deployments for Amazon ECS, allowing you to specify a blue/green configuration that automatically shifts traffic from the old (blue) task set to the new (green) task set. It integrates with the ALB to perform health checks and can automatically roll back the deployment if the health checks fail, meeting 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.
✗
Configure ECS service auto scaling to replace tasks gradually.
Why it's wrong here
Auto scaling is not a deployment tool.
✗
Manually update the ECS service using the AWS Management Console.
Why it's wrong here
Manual updates do not provide automatic rollback.
✗
Use AWS CloudFormation to update the ECS service with a new task definition.
Why it's wrong here
CloudFormation updates the service but does not handle traffic shifting or rollback.
✓
Use AWS CodeDeploy with a blue/green deployment configuration.
Why this is correct
CodeDeploy automates blue/green deployments and rollback for ECS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse ECS service auto scaling or CloudFormation updates with deployment strategies, but neither provides the built-in blue/green traffic shifting and automatic health-check-based rollback that CodeDeploy offers.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy for ECS creates two task sets (blue and green) and uses a 'shift' or 'canary' traffic routing configuration via the ALB target groups. The deployment monitors the green task set's health against the ALB's health check settings; if the health check fails during the deployment lifecycle hook, CodeDeploy automatically triggers a rollback by shifting traffic back to the blue task set and terminating the green tasks. This is particularly useful in production environments where zero-downtime deployments and automated safety nets are critical.
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: Use AWS CodeDeploy with a blue/green deployment configuration. — AWS CodeDeploy natively supports blue/green deployments for Amazon ECS, allowing you to specify a blue/green configuration that automatically shifts traffic from the old (blue) task set to the new (green) task set. It integrates with the ALB to perform health checks and can automatically roll back the deployment if the health checks fail, meeting 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.
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 developer is deploying an application to Amazon ECS using AWS CodeDeploy with a blue/green deployment strategy. After the new task set is created, it fails health checks. The developer wants to immediately route traffic back to the original task set without waiting for CodeDeploy to complete the rollback process. Which action should the developer take?
medium
A.Update the ECS service to set the desired count of the new task set to zero.
✓ B.Use the CodeDeploy console to stop the deployment and then choose to reroute traffic.
C.Delete the new task set.
D.Update the Application Load Balancer listener rule to forward traffic to the original target group.
Why B: Option B is correct because CodeDeploy's blue/green deployments for ECS include a built-in 'Reroute traffic' option that allows you to immediately redirect traffic back to the original task set when a deployment fails health checks. This action bypasses the normal rollback process, which would wait for the deployment to complete or for the configured rollback triggers to fire, giving the developer instant control over traffic routing.
Variation 2. A developer is using AWS CodeDeploy to deploy an application to an Amazon ECS service using the Fargate launch type. The developer wants to ensure that the deployment rolls back automatically if the new task set fails health checks. Which configuration should the developer set?
easy
A.Set the deployment type to in-place.
✓ B.Enable rollback in the deployment group settings.
C.Set the deployment configuration to CodeDeployDefault.OneAtATime.
D.Configure CloudWatch alarms to trigger a rollback.
Why B: Option B is correct because enabling rollback in the deployment group settings allows CodeDeploy to automatically revert the deployment to the previous working task set if the new task set fails health checks. This is a native feature of CodeDeploy that monitors the health of the ECS service and triggers a rollback without manual intervention.
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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.
Question Discussion
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