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This guide explains the purpose of Kubernetes Federation, its benefits for multi‑cluster management, step‑by‑step installation using Helm and kubefedctl, how to join and unjoin clusters, enable resource federation, and provides a cheat sheet of common commands for reliable cross‑cluster deployments.
This article explains why Kubernetes single‑cluster scalability is limited to about 5,000 nodes, introduces the concept of multi‑cluster federation, compares the legacy kubefed project with the actively maintained Karmada solution, and shows how policies and replica‑scheduling enable flexible cross‑AZ deployments and failover.
This article details the architectural background, challenges, and practical solutions implemented in SOFAStack CAFE for cloud‑native multi‑cluster deployment, including a custom multi‑topology CRD, an independent federation API server, enhanced KubeFed controller features, and network proxy integration to support hybrid‑cloud scenarios.