Build environments, caching, and VPC access

Exam alignment: DOP-C02 Domain 1 task statements for pipelines, testing, artifacts, or deployment.

Learning objective

Optimize build time and private connectivity without losing reproducibility.

Difficulty / Schwierigkeitsgrad	Intermediate
Study time / Lernzeit	120 minutes
Prerequisites / Voraussetzungen	Previous lessons in this volume

Professional scenario

Dependencies download every run and a private package endpoint is reachable only inside a VPC.

Core concepts

• Managed images reduce maintenance; custom images require patching.
• Cache accelerates builds but must not define correctness.
• VPC builds require routes, DNS, security groups, and endpoints or egress.
• Compute choice should follow measurement.

Architecture flow

1. Identify the release input and immutable identity.
2. Select the managed AWS control plane and least-privilege role.
3. Execute build, test, artifact, or deployment work.
4. Collect service events, logs, reports, and runtime metrics.
5. Stop, retry, or roll back according to explicit rules.

Decision matrix

Requirement	Preferred choice	Reason
Low maintenance	Managed image	AWS-maintained baseline
Private dependency	VPC-enabled build	Private network path
Repeated downloads	Dependency cache	Shorter build time

Failure modes and troubleshooting

• VPC build has no NAT or endpoints.
• Stale cache causes confusing output.
• Larger compute does not help I/O bottleneck.

Security and operations

• Use short-lived service roles and least privilege.
• Encrypt artifacts and protect logs from secret exposure.
• Record changes and approvals for audit.

Hands-on lab

Goal / Ziel: Measure a clean and cached build.

Tasks

1. Create the smallest safe test architecture.
2. Implement or simulate the main workflow.
3. Introduce one controlled failure.
4. Diagnose it from service evidence.
5. Document cleanup and one improvement.

Validation

• The workflow uses an immutable version.
• A required failure blocks promotion.
• The diagnosis identifies the first failed transition.

Cost control / Kostenkontrolle: Keep resources short lived; read cleanup before starting.

Cleanup

1. Delete pipeline/build/deployment resources.
2. Delete temporary artifacts, images, logs, and roles.

Exam traps

• Treating cache as repository.
• Selecting largest compute without data.

Key takeaways

• Managed images reduce maintenance; custom images require patching.
• Compute choice should follow measurement.
• Decisions must be justified by requirements and failure behavior.

Review questions

1. What is the immutable release identity?
2. Which evidence proves failure or success?
3. What is the safest recovery action?

Answers

1. A version, digest, or uniquely versioned artifact.
2. Service events, logs, reports, health checks, and runtime metrics.
3. Restore the known-good version using the configured rollback path.