## How the controller-runtime Cache Actually Works, and Why Your Controller Does Not Crash the API Server

- 種別: release
- 関連技術: kubernetes, go
- 公開日時: 2026-07-29T18:00:00.000Z
- 情報源: Kubernetes Blog (https://kubernetes.io/blog/2026/07/29/controller-runtime-cache-explained/)
- パーマリンク: https://vulnpulse.app/items/kubernetes-fa8dc50b2456

This article has been revised since it was first published, to correct several significant technical inaccuracies in the original text. Kubernetes has long been the default platform for distributed workloads, and writing your own controller for it is now a matter of a few hours. The common path — Golang, using kubebuilder on top of controller-runtime — gives you a project scaffold, types, and a reconciler. For typical scenarios that is more than enough. But as soon as load grows or the controller starts behaving in ways you did not expect, a whole class of edge cases shows up. Most of them tr…