- A
Create a CloudWatch alarm that monitors the DeploymentFailure metric and configure it as a rollback trigger in the deployment group.
This is the correct method. CodeDeploy can use CloudWatch alarms as rollback triggers. When the alarm enters the ALARM state, the deployment is automatically rolled back.
- B
Define a lifecycle hook in the Auto Scaling group that terminates instances with failing health checks.
Why wrong: Lifecycle hooks allow you to pause instance launch or termination for custom actions, but they do not automatically roll back a deployment.
- C
Set the deployment configuration to use a minimum healthy host percentage of 80% and a timeout of 5 minutes.
Why wrong: This only controls how many instances must remain healthy during the deployment. It does not automatically roll back if health checks fail after the deployment completes.
- D
Configure the AppSpec file with a rollback section that specifies the health check failure threshold.
Why wrong: The AppSpec file does not have a rollback section. Rollback settings are configured in the deployment group, not in the AppSpec.
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 company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group of EC2 instances. The deployment must automatically roll back if the new application version causes health check failures for more than 20% of the instances within the first 5 minutes after deployment. Which configuration should the developer set in the deployment group?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 monitors the DeploymentFailure metric and configure it as a rollback trigger in the deployment group.
Option A is correct because AWS CodeDeploy supports CloudWatch alarm-based rollback triggers. By creating a CloudWatch alarm that monitors the DeploymentFailure metric (or a custom metric reflecting health check failures) and configuring it as a rollback trigger in the deployment group, the deployment will automatically roll back if the alarm state is breached within the specified monitoring period (e.g., 5 minutes). This directly meets the requirement to roll back when more than 20% of instances fail health checks.
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 monitors the DeploymentFailure metric and configure it as a rollback trigger in the deployment group.
Why this is correct
This is the correct method. CodeDeploy can use CloudWatch alarms as rollback triggers. When the alarm enters the ALARM state, the deployment is automatically rolled back.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Define a lifecycle hook in the Auto Scaling group that terminates instances with failing health checks.
Why it's wrong here
Lifecycle hooks allow you to pause instance launch or termination for custom actions, but they do not automatically roll back a deployment.
- ✗
Set the deployment configuration to use a minimum healthy host percentage of 80% and a timeout of 5 minutes.
Why it's wrong here
This only controls how many instances must remain healthy during the deployment. It does not automatically roll back if health checks fail after the deployment completes.
- ✗
Configure the AppSpec file with a rollback section that specifies the health check failure threshold.
Why it's wrong here
The AppSpec file does not have a rollback section. Rollback settings are configured in the deployment group, not in the AppSpec.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deployment configuration settings (like minimum healthy hosts) with rollback triggers, not realizing that rollback triggers require explicit CloudWatch alarm integration rather than just threshold-based deployment settings.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy's CloudWatch alarm rollback trigger works by polling the alarm state during the deployment. If the alarm enters ALARM state, CodeDeploy immediately initiates a rollback to the last known good revision, even if the deployment is still in progress. This is particularly useful in scenarios where health checks are slow to fail or where you need to react to application-level metrics (e.g., HTTP 5xx errors) rather than just instance-level status.
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 monitors the DeploymentFailure metric and configure it as a rollback trigger in the deployment group. — Option A is correct because AWS CodeDeploy supports CloudWatch alarm-based rollback triggers. By creating a CloudWatch alarm that monitors the DeploymentFailure metric (or a custom metric reflecting health check failures) and configuring it as a rollback trigger in the deployment group, the deployment will automatically roll back if the alarm state is breached within the specified monitoring period (e.g., 5 minutes). This directly meets the requirement to roll back when more than 20% of instances fail health checks.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
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