Advanced DevOps – Puppet, Terraform and Kubernetes — Lesson 3: Applying Puppet Baselines and Preparing Kubernetes Nodes

Technical Scope

• Puppet classes, modules, facts, templates, and Hiera
• Package, service, kernel, and runtime configuration
• Certificates, secrets, and environment classification
• Convergence testing and configuration drift

Instructor Demonstration

Apply a Kubernetes node baseline and verify repeatable Puppet convergence.

Applied Workshop

Create separate control-plane and worker profiles with shared hardening.

1. Translate the scenario into configuration, access, state, pipeline, or module decisions.
2. Implement the change in a controlled workspace or repository.
3. Capture the plan, logs, outputs, policy results, and post-change checks.
4. Explain one safer or more maintainable alternative and its trade-off.

Validation Standard

Repeated runs are stable and nodes meet the prerequisites expected by the cluster layer.

• The intended target, identity, environment, and state boundary are confirmed.
• The plan or execution evidence contains no unexplained destructive action.
• Security, reliability, maintainability, and operational ownership are reviewed.
• The final result can be reproduced from version-controlled inputs.

Failure Analysis

Resolve catalog failures, certificate issues, Hiera lookup errors, and non-converging resources.

Learners isolate the smallest verified cause, correct it, rerun the relevant validation step, and record the preventive action in the course improvement log.