- A
Create a CloudWatch alarm that triggers when the healthy task count of the ECS service falls below a threshold. Configure the CodeDeploy deployment group to automatically roll back when this alarm is in ALARM state.
This allows automatic rollback based on health check failure, as the healthy task count will drop.
- B
Modify the CodeDeploy deployment group to enable automatic rollback when a deployment fails. The deployment will automatically revert to the last successful deployment.
Why wrong: CodeDeploy can roll back on deployment failure, but the question says the deployment 'failed' already; the team wants rollback on health check failure, which is a different condition.
- C
Increase the deployment timeout in the CodeDeploy deployment configuration to allow more time for the new task set to become healthy.
Why wrong: This only delays the failure, it does not add automatic rollback.
- D
Configure the ECS service to automatically roll back to the previous task definition if the deployment fails. Use the ECS service's deployment circuit breaker.
Why wrong: ECS deployment circuit breaker can roll back, but for blue/green deployments managed by CodeDeploy, the rollback is configured in CodeDeploy, not ECS.
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 team is using AWS CodePipeline to deploy a critical application to Amazon ECS. The pipeline has a deployment stage that uses Amazon ECS (Blue/Green) action with CodeDeploy. Recently, the deployment failed because the new task set did not become healthy within the specified timeout. The team wants to ensure that future deployments automatically roll back if the health check fails. What should the team do?
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
Create a CloudWatch alarm that triggers when the healthy task count of the ECS service falls below a threshold. Configure the CodeDeploy deployment group to automatically roll back when this alarm is in ALARM state.
Option A is correct because it leverages CloudWatch alarms to monitor the health of the ECS service's new task set. When the alarm triggers due to insufficient healthy tasks, CodeDeploy can automatically initiate a rollback to the previous revision. This approach provides a proactive, health-based rollback mechanism that directly addresses the failure condition described (new task set not becoming healthy within timeout).
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 CloudWatch alarm that triggers when the healthy task count of the ECS service falls below a threshold. Configure the CodeDeploy deployment group to automatically roll back when this alarm is in ALARM state.
Why this is correct
This allows automatic rollback based on health check failure, as the healthy task count will drop.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Modify the CodeDeploy deployment group to enable automatic rollback when a deployment fails. The deployment will automatically revert to the last successful deployment.
Why it's wrong here
CodeDeploy can roll back on deployment failure, but the question says the deployment 'failed' already; the team wants rollback on health check failure, which is a different condition.
- ✗
Increase the deployment timeout in the CodeDeploy deployment configuration to allow more time for the new task set to become healthy.
Why it's wrong here
This only delays the failure, it does not add automatic rollback.
- ✗
Configure the ECS service to automatically roll back to the previous task definition if the deployment fails. Use the ECS service's deployment circuit breaker.
Why it's wrong here
ECS deployment circuit breaker can roll back, but for blue/green deployments managed by CodeDeploy, the rollback is configured in CodeDeploy, not ECS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'automatic rollback on deployment failure' (Option B) with 'health-based rollback via CloudWatch alarms' (Option A), not realizing that the former only triggers after the deployment times out, while the latter proactively rolls back during the health check phase.
Detailed technical explanation
How to think about this question
CodeDeploy Blue/Green deployments for ECS use a 'shift traffic' process where the new task set is created and must pass health checks before traffic is shifted. A CloudWatch alarm on the 'HealthyTaskCount' metric (or 'Service' metric) can be configured as a deployment group alarm; when the alarm enters ALARM state, CodeDeploy automatically rolls back to the previous task set without waiting for the deployment timeout. This is distinct from a simple deployment failure rollback, which only activates after the entire deployment fails.
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.
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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: Create a CloudWatch alarm that triggers when the healthy task count of the ECS service falls below a threshold. Configure the CodeDeploy deployment group to automatically roll back when this alarm is in ALARM state. — Option A is correct because it leverages CloudWatch alarms to monitor the health of the ECS service's new task set. When the alarm triggers due to insufficient healthy tasks, CodeDeploy can automatically initiate a rollback to the previous revision. This approach provides a proactive, health-based rollback mechanism that directly addresses the failure condition described (new task set not becoming healthy within timeout).
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 24, 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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