SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company uses AWS CodePipeline to deploy a web application. They want to automatically roll back the deployment if the new version fails CloudWatch alarm-based health checks. Which feature should they use?
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
✓
CodeDeploy automatic rollback configuration with CloudWatch alarm.
AWS CodeDeploy natively supports automatic rollback triggered by CloudWatch alarms. When a deployment causes a CloudWatch alarm to enter an ALARM state, CodeDeploy can automatically revert to the previous working version. This is the most straightforward and integrated solution for the requirement. Option A (Lambda + CloudWatch Events) is possible but not the primary recommended feature. Option B (Route 53 health checks) is for DNS-level failover, not deployment rollback. Option C (CodeBuild post-build actions) is for build phase, not post-deployment monitoring.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Lambda function invoked by CloudWatch Events.
Why it's wrong here
Lambda could be used, but CodeDeploy has built-in rollback based on alarms.
- ✗
Amazon Route 53 health checks with failover routing.
Why it's wrong here
Route 53 health checks are for DNS-level failover, not deployment rollback.
- ✗
AWS CodeBuild with post-build actions.
Why it's wrong here
CodeBuild is for building and testing, not deployment rollback.
- ✓
CodeDeploy automatic rollback configuration with CloudWatch alarm.
Why this is correct
CodeDeploy supports automatic rollback when a CloudWatch alarm is in ALARM state.
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 |
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