SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company uses AWS CloudFormation to deploy infrastructure. The operations team notices that stack updates frequently fail because of updates to resources that are not supported for updates. What is the BEST way to handle this?
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
✓
Use a change set to review the proposed changes before executing the update.
The best practice is to use a change set to preview changes and identify unsupported updates before executing the update.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS Config rules to prevent updates.
Why it's wrong here
AWS Config rules only evaluate resource compliance after changes occur; they cannot intercept a CloudFormation stack update or substitute replacement resources. Config is designed for continuous compliance auditing and drift detection across accounts. The scenario needs CloudFormation to replace unsupported resources automatically, which Config rules never perform.
- ✗
Delete the stack and create a new one for each update.
Why it's wrong here
Deleting and recreating the stack destroys all resources and their data, causing an outage, and cannot update resources in place. It is tempting because full replacement guarantees a clean state when drift or immutable resources block updates, but CloudFormation stack update with resource import or replacement handles unsupported updates without teardown.
- ✗
Use AWS Service Catalog to enforce version control.
Why it's wrong here
AWS Service Catalog governs which products end users may provision and their versions; it does not alter how CloudFormation applies a stack update, so updates to immutable resource properties still fail. It is tempting because Service Catalog does provide version control over provisioned products, which suits governed self-service catalogues rather than repairing failing stack updates.
- ✓
Use a change set to review the proposed changes before executing the update.
Why this is correct
Change sets preview exactly which resources CloudFormation will replace, modify or leave untouched, exposing unsupported-update resources before execution. Reviewing this plan lets the operations team detect and correct problematic resource definitions ahead of the update, directly preventing the frequent stack-update failures described in the stem.
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