Technology · Ebook

Open Cluster Management: A Hub for Your Kubernetes Fleet

by Shriira Press

Once an organization runs more than a handful of Kubernetes clusters, ordinary single-cluster tooling breaks down. Open Cluster Management (OCM) is a CNCF project that governs many clusters from one hub without becoming a bottleneck, using a pull-based klusterlet agent on each managed cluster. This book covers the hub-and-spoke architecture, the double opt-in registration handshake, the ManagedCluster inventory and cluster sets, Placement and PlacementDecision for selecting clusters, ManifestWork for distributing and tracking workloads, the addon framework that extends agents cleanly, and the governance policy framework that keeps a fleet compliant. It closes with operating OCM in practice and where it fits alongside Argo CD, KubeVela, Gatekeeper, and Istio.

Contents

1. 1Preface
2. 2Chapter 1 — The Many-Cluster Problem
3. 3Chapter 2 — Hub-and-Spoke Architecture
4. 4Chapter 3 — Registering a Cluster
5. 5Chapter 4 — The Cluster Inventory
6. 6Chapter 5 — Placement and Scheduling
7. 7Chapter 6 — Distributing Work with ManifestWork
8. 8Chapter 7 — The Addon Framework
9. 9Chapter 8 — The Governance Policy Framework
10. 10Chapter 9 — Operating OCM
11. 11Chapter 10 — OCM in Practice