Overview

Stop writing scripts. Start engineering platforms. Kubernetes has won the container war. But for many organizations, ""using"" Kubernetes still means drowning in a sea of YAML files, manual kubectl commands, and fragile Bash scripts that break at 3 AM. To scale infrastructure, you cannot just be a Kubernetes User. You must become a Kubernetes Extender. The Operator Handbook is the definitive guide for SREs, DevOps Engineers, and Go Developers who are ready to cross the chasm from consumer to creator. It moves beyond the ""Hello World"" tutorials and basic reconciliation loops to reveal the deep physics of the Kubernetes Control Plane. This is not a book about how to deploy a Pod. This is a book about how to build the software that deploys the Pods for you, heals them when they break, and upgrades them without downtime. Inside, you will navigate the entire lifecycle of a production-grade Operator: The Physics of the API: Understand Level-Triggered Logic, Informers, Workqueues, and the optimistic concurrency of etcd. The Reconciliation Loop: Master the core pattern of Kubernetes. Learn to write idempotent logic, implement Server-Side Apply (SSA), and optimize performance with Event Filters and Predicates. Safety & Governance: Build robust admission controllers with Mutating and Validating Webhooks to reject bad config before it reaches the database. prevent deadlocks and ensure structural integrity. State Management: Handle the difficult ""Day 2"" operations. Implement Finalizers for external cleanup, manage OwnerReferences for garbage collection, and orchestrate complex state machines for cloud resources. Production Observability: Instrument your Operator with custom Prometheus metrics, structured logs, and distributed tracing to answer the question, ""Where did the time go?"" Testing Strategy: Move beyond simple unit tests. Learn to use the envtest framework for integration testing, KUTTL for End-to-End scenarios, and native Go fuzzing to bulletproof your CRD inputs. Distribution & Maintenance: Package your software for the world using Helm and OLM Bundles. Master the art of CRD versioning, conversion webhooks, and storage migration to ensure zero-data-loss upgrades. Who is this book for?If you are tired of pasting the same YAML 100 times, if you want to build internal developer platforms (IDPs), or if you want to package your company's software for the OperatorHub, this book is your blueprint. Don't just run Kubernetes. Program it. Scroll up and grab your copy today to start building the next generation of cloud-native software.

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