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Question 981 of 1,616

Deployment →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration. This works because CodeDeploy’s AutoRollbackConfiguration allows you to specify a CloudWatch alarm as a trigger; when the alarm’s evaluation period is set to 10 minutes, any health check failure on a new EC2 instance within that window will automatically revert the deployment to the last known good revision. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how CodeDeploy integrates with CloudWatch for health monitoring, and a common trap is confusing alarm-based rollback with the simpler “deployment failure” rollback option, which only triggers on a failed deployment event, not on post-deployment health checks. Remember the key distinction: for health-check-driven rollbacks, you must explicitly create a CloudWatch alarm and link it in the AutoRollbackConfiguration. A helpful memory tip is “Alarm for Arm” — a CloudWatch alarm arms your automatic rollback against unhealthy instances.

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. A key principle to apply: codeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms.. 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 using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The developer wants the deployment to automatically roll back if any of the new instances fail a health check within the first 10 minutes after deployment. Which configuration should the developer set in the CodeDeploy 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.

Question 1hardmultiple choice

Full question →

A
Configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration.
The AutoRollbackConfiguration in the deployment group allows you to specify events that trigger an automatic rollback, including alarm (CloudWatch alarm). The developer can set an alarm that monitors health check metrics and configure the deployment group to roll back if that alarm is in the ALARM state.
B
Set the DeploymentStyle to 'BLUE_GREEN' and configure the 'LoadBalancerInfo' with the target group.
Why wrong: This configures a blue/green deployment, but does not set up automatic rollback. Rollback still requires additional configuration.
C
Create a lifecycle hook for the Auto Scaling group to trigger a rollback script.
Why wrong: Lifecycle hooks allow you to perform custom actions before instances launch or terminate, but they do not inherently trigger a CodeDeploy rollback.
D
Set a TriggerConfiguration in the deployment group to send notifications on deployment failure.
Why wrong: TriggerConfiguration is used for SNS notifications, not for automatic rollback. Rollback must be configured separately.

Full breakdown with real-world context →

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

✓

Configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration.

Option A is correct because CodeDeploy's AutoRollbackConfiguration allows you to specify CloudWatch alarms as triggers for automatic rollback. By creating a CloudWatch alarm that monitors the EC2 Auto Scaling group's health check failures and setting the alarm's evaluation period to 10 minutes, the deployment will automatically roll back if any new instance fails a health check within that window. This directly meets the requirement without custom scripting or manual intervention.

Key principle: CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms.

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 a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration.
Why this is correct
The AutoRollbackConfiguration in the deployment group allows you to specify events that trigger an automatic rollback, including alarm (CloudWatch alarm). The developer can set an alarm that monitors health check metrics and configure the deployment group to roll back if that alarm is in the ALARM state.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms.
✗
Set the DeploymentStyle to 'BLUE_GREEN' and configure the 'LoadBalancerInfo' with the target group.
Why it's wrong here
This configures a blue/green deployment, but does not set up automatic rollback. Rollback still requires additional configuration.
✗
Create a lifecycle hook for the Auto Scaling group to trigger a rollback script.
Why it's wrong here
Lifecycle hooks allow you to perform custom actions before instances launch or terminate, but they do not inherently trigger a CodeDeploy rollback.
✗
Set a TriggerConfiguration in the deployment group to send notifications on deployment failure.
Why it's wrong here
TriggerConfiguration is used for SNS notifications, not for automatic rollback. Rollback must be configured separately.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse event-based notifications (TriggerConfiguration) with automated rollback actions (AutoRollbackConfiguration), or mistakenly think lifecycle hooks or deployment style settings inherently provide health-check-based rollback.

Detailed technical explanation

How to think about this question

Under the hood, CodeDeploy's AutoRollbackConfiguration polls the specified CloudWatch alarm state; when the alarm enters ALARM state, CodeDeploy automatically initiates a rollback to the last known good revision. The CloudWatch alarm can be based on metrics like ELB's UnHealthyHostCount or EC2's StatusCheckFailed, with a period and evaluation periods that sum to the desired 10-minute window. A real-world scenario is when a deployment introduces a misconfiguration that causes new instances to fail the target group health check; the alarm triggers within minutes, rolling back before user impact escalates.

KKey Concepts to Remember

CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms.
It can also roll back on deployment failure or manual stop.
CloudWatch alarms monitor metrics and transition to `ALARM` state based on defined thresholds.
Rollback reverts the application to its last successfully deployed revision.

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

CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms.

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. CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms. 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.

Review codeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms., then practise related DVA-C02 questions on the same topic to reinforce the concept.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Deployment — This question tests Deployment — CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms..

What is the correct answer to this question?

The correct answer is: Configure a CloudWatch alarm and enable alarm-based automatic rollback in the AutoRollbackConfiguration. — Option A is correct because CodeDeploy's AutoRollbackConfiguration allows you to specify CloudWatch alarms as triggers for automatic rollback. By creating a CloudWatch alarm that monitors the EC2 Auto Scaling group's health check failures and setting the alarm's evaluation period to 10 minutes, the deployment will automatically roll back if any new instance fails a health check within that window. This directly meets the requirement without custom scripting or manual intervention.

What should I do if I get this DVA-C02 question wrong?

Review codeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms., then practise related DVA-C02 questions on the same topic to reinforce the concept.

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?

CodeDeploy's `AutoRollbackConfiguration` can be triggered by CloudWatch alarms.

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Same concept, more angles

1 more ways this is tested on DVA-C02

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 using AWS CodeDeploy to deploy an application to an EC2 Auto Scaling group. The deployment must be rolled back automatically if any instance in the deployment fails a health check within 10 minutes after the deployment. Which configuration should the developer set in the CodeDeploy deployment group?

medium

A.Set the deployment style to in-place and enable automatic rollback with event triggers.
B.Configure a deployment configuration with a minimum healthy hosts of 90% and enable CloudWatch alarm-based rollback.
C.Set the deployment style to blue/green and enable automatic rollback for deployment failure.
✓ D.Configure a deployment group with automatic rollback enabled and set the rollback trigger to instance failure.

Why D: Option D is correct because the developer needs to configure the CodeDeploy deployment group with automatic rollback enabled and set the rollback trigger to 'instance failure'. This configuration ensures that if any instance fails a health check within the specified monitoring period (10 minutes after deployment), CodeDeploy automatically rolls back the deployment to the last known good revision. The 'instance failure' trigger specifically monitors the health of each instance and initiates a rollback when a health check fails, meeting the requirement exactly.

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