DVA-C02 CI/CD, Runtime Config, and Rollbacks Guide

This lesson covers the highest-value release judgment in DVA-C02. AWS wants developers to know how code moves from commit to build to test to staged deployment, how runtime configuration can shape behavior dynamically, and how to roll back safely when a release goes wrong.

Canary deployment: Release strategy that shifts a small portion of traffic to the new version first, then expands if the results stay healthy.

Rollback: Return to a previously known-good version when the new deployment fails or creates unacceptable risk.

Release flow that DVA-C02 expects you to recognize

    flowchart LR
	  A["Commit or merge"] --> B["Build artifact"]
	  B --> C["Automated tests"]
	  C --> D["Deploy to controlled environment"]
	  D --> E["Canary or staged promotion"]
	  E --> F["Observe alarms and health"]
	  F --> G["Promote fully or roll back"]

What AWS is really testing here

AWS wants you to distinguish:

• pipeline trigger from release strategy
• static package build from runtime configuration
• full replacement deployment from blue/green or canary promotion
• rollback readiness from blind release speed

High-yield chooser

Common traps

• choosing the fastest deployment instead of the safest one
• treating runtime config like a substitute for version control
• forgetting that rollback planning must exist before deployment
• confusing “pipeline exists” with “release strategy is safe”

Decision order that usually wins

1. Ask whether the challenge is progressive exposure, release safety, or rollback speed.
2. If a new version should reach only a small percentage of users first, think canary deployment.
3. If the release fails, the strongest next need is a quick return to a known-good version.
4. Keep deployment strategy and monitoring signal paired; rollout without rollback is incomplete.
5. DVA-C02 rewards the answer that limits blast radius instead of maximizing release speed.

Quiz