The answer is to configure the ECS service to use the CodeDeploy deployment controller, create an ECS application and deployment group in CodeDeploy, and define the blue/green target groups and listener in the deployment group. This is required because CodeDeploy orchestrates the traffic shifting between the blue (current) and green (new) environments by managing the load balancer listener and target groups, ensuring zero-downtime deployments. On the AWS Certified Developer Associate DVA-C02 exam, this tests your understanding of the CodeDeploy-ECS integration, often appearing as a scenario where you must select the three mandatory setup steps. A common trap is forgetting that the ECS service itself must be configured to use the CodeDeploy controller, not just the deployment group. Remember the mnemonic: "Service, Group, Listener" — the ECS service must use CodeDeploy, the deployment group defines the application, and the listener routes traffic between the two target groups.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which THREE actions are required to set up a blue/green deployment for an Amazon ECS service using AWS CodeDeploy? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an ECS application and deployment group in CodeDeploy.
Option B is correct because CodeDeploy requires an ECS application and deployment group to manage the deployment lifecycle, including traffic shifting and rollback. The deployment group defines the ECS service, target groups, and load balancer listener for routing traffic between blue and green environments.
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.
✗
Create a second ECS service for the green environment.
Why it's wrong here
CodeDeploy manages the green task set within the same service.
✓
Create an ECS application and deployment group in CodeDeploy.
Why this is correct
This is required to define the deployment settings.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new Application Load Balancer for the green environment.
Why it's wrong here
The existing load balancer is used; traffic is shifted.
✓
Specify the task definition and container images in the AppSpec file.
Why this is correct
The AppSpec file defines the deployment details.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the ECS service to use the CodeDeploy deployment controller.
Why this is correct
This enables blue/green deployments.
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 mistakenly think they need to create a second ECS service or a new ALB for the green environment, but CodeDeploy handles the green infrastructure automatically within the same service and ALB.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy orchestrates a blue/green deployment by creating a new task set (green) in the same ECS service, registering it with a replacement target group, and then shifting traffic from the original target group (blue) to the new one using the ALB listener rules. The AppSpec file defines the task definition, container images, and the load balancer listener port and target group names, enabling CodeDeploy to manage the traffic routing 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: Create an ECS application and deployment group in CodeDeploy. — Option B is correct because CodeDeploy requires an ECS application and deployment group to manage the deployment lifecycle, including traffic shifting and rollback. The deployment group defines the ECS service, target groups, and load balancer listener for routing traffic between blue and green environments.
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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