Technology · Ebook

Operator Framework: Building Kubernetes Operators

by Shriira Press

The Operator Framework is the CNCF toolkit for building, packaging, distributing, and managing Kubernetes Operators — software that encodes app-specific operational expertise (clustering, backups, failover, upgrades) so complex applications operate themselves. This free book teaches it from the ground up: the application operations problem and what the framework is, the operator pattern and Kubernetes extensibility, the framework's architecture (SDK, OLM, OperatorHub), the operator pattern (CRDs, controllers, reconciliation), the Operator SDK, building operators with Go, Helm, and Ansible, the Operator Lifecycle Manager (OLM), packaging, bundles, and OperatorHub, capability levels and best practices, and using the framework in practice. Ten focused chapters with clear diagrams that make Operators concrete — define a declarative app API (CRDs), write reconciliation logic that automates day-2 operations, package and distribute as bundles, and manage on clusters with OLM — turning operational expertise into automated, self-operating applications on Kubernetes.

Contents

1. 1Preface
2. 2Chapter 1 — What the Operator Framework Is
3. 3Chapter 2 — The Operator Pattern and Kubernetes Extensibility
4. 4Chapter 3 — Operator Framework Architecture
5. 5Chapter 4 — The Operator Pattern: CRDs, Controllers, and Reconciliation
6. 6Chapter 5 — The Operator SDK
7. 7Chapter 6 — Building Operators with Go, Helm, and Ansible
8. 8Chapter 7 — The Operator Lifecycle Manager (OLM)
9. 9Chapter 8 — Packaging, Bundles, and OperatorHub
10. 10Chapter 9 — Capability Levels and Best Practices
11. 11Chapter 10 — The Operator Framework in Practice