- A
Configure the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer
Provides both automatic rollback on alarm and failure, and alerting on rollback failure.
- B
Create a CloudWatch Events rule that triggers an AWS Lambda function to roll back the deployment when the alarm state is reached, and configure the Lambda function to send an SNS notification on failure
Why wrong: More complex than using built-in CodeDeploy features.
- C
Add a manual approval step before the deploy stage in CodePipeline and require the on-call engineer to approve or reject the deployment
Why wrong: Manual approval defeats automation.
- D
Enable the 'rollback when a deployment fails' option in the deployment group and create a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer via Amazon SNS
Why wrong: This handles failure but not the alarm-based rollback.
DOP-C02 CodeDeploy automatic rollback Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: codeDeploy automatic rollback. 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 has a CI/CD pipeline using AWS CodePipeline that deploys a critical web application to an Auto Scaling group of EC2 instances. The pipeline includes a deploy stage using AWS CodeDeploy. Recently, the deployment failed because the new application version caused an increase in HTTP 500 errors. The operations team manually rolled back the deployment by redeploying the previous version. However, the team wants to automate this process so that future failed deployments are automatically rolled back. Additionally, they want to ensure that if the rollback itself fails, the system should alert the on-call engineer. Currently, the deployment group is configured with 'rollback when a deployment fails' disabled. The team has also set up a CloudWatch alarm that triggers when the HTTP 500 error rate exceeds a threshold. What should a DevOps engineer do to meet these requirements with minimal operational overhead?
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 the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer
Option A is correct because it uses CodeDeploy's built-in features to automatically roll back when a CloudWatch alarm (HTTP 500 error rate) triggers, and also enables rollback on deployment failure. If the rollback itself fails, the deployment group's failure metric triggers a CloudWatch alarm to notify the on-call engineer via SNS. This meets all requirements with minimal operational overhead. Option B is incorrect because it adds unnecessary complexity with a Lambda function, while CodeDeploy already supports alarm-based rollback. Option C introduces manual intervention, which contradicts the automation requirement. Option D only enables rollback on failure, not on alarm, so it would not detect HTTP 500 errors during deployment.
Key principle: CodeDeploy automatic rollback
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 the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer
Why this is correct
Provides both automatic rollback on alarm and failure, and alerting on rollback failure.
Related concept
CodeDeploy automatic rollback
- ✗
Create a CloudWatch Events rule that triggers an AWS Lambda function to roll back the deployment when the alarm state is reached, and configure the Lambda function to send an SNS notification on failure
Why it's wrong here
More complex than using built-in CodeDeploy features.
- ✗
Add a manual approval step before the deploy stage in CodePipeline and require the on-call engineer to approve or reject the deployment
Why it's wrong here
Manual approval defeats automation.
- ✗
Enable the 'rollback when a deployment fails' option in the deployment group and create a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer via Amazon SNS
Why it's wrong here
This handles failure but not the alarm-based rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may think that a custom Lambda or manual approval is needed, but CodeDeploy natively supports rolling back based on CloudWatch alarms.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- CodeDeploy automatic rollback
- CloudWatch alarm on deployment failure metric
- Rollback on CloudWatch alarm
- SNS notification
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 automatic rollback
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 automatic rollback Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Review codeDeploy automatic rollback, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — CodeDeploy automatic rollback.
What is the correct answer to this question?
The correct answer is: Configure the deployment group to automatically roll back when a CloudWatch alarm is triggered, and also enable automatic rollback on deployment failure. Set up a CloudWatch alarm on the deployment group's failure metric to notify the on-call engineer — Option A is correct because it uses CodeDeploy's built-in features to automatically roll back when a CloudWatch alarm (HTTP 500 error rate) triggers, and also enables rollback on deployment failure. If the rollback itself fails, the deployment group's failure metric triggers a CloudWatch alarm to notify the on-call engineer via SNS. This meets all requirements with minimal operational overhead. Option B is incorrect because it adds unnecessary complexity with a Lambda function, while CodeDeploy already supports alarm-based rollback. Option C introduces manual intervention, which contradicts the automation requirement. Option D only enables rollback on failure, not on alarm, so it would not detect HTTP 500 errors during deployment.
What should I do if I get this DOP-C02 question wrong?
Review codeDeploy automatic rollback, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CodeDeploy automatic rollback
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Last reviewed: Jun 20, 2026
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