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Fatih Arslan

Fatih Arslan

For the past few years I've spent most of my time building database operators on top of Kubernetes. Along the way I kept coming back to the same idea: under all the YAML and the moving parts, Kubernetes is really a framework for feedback controllers. It's control theory turned into something ordinary people can use. The same closed loop that keeps a thermostat at the right temperature is also the one that keeps your database alive.
So I finally sat down and wrote about it on the PlanetScale blog.
The post starts from running Postgres by hand, picking a node, attaching a disk, setting up replication, and writing a small watchdog script to fix things when they break. Then it walks through how each of those manual steps maps to a control loop inside Kubernetes, and why operators are built the way they are. It dips into a bit of control theory along the way. I think even if you don't use Kubernetes, you'll enjoy reading it.
You can read it here: The Feedback Loops Behind Kubernetes.
https://arslan.io/2026/06/16/kubernetes-runs-on-feedback-loops/

Kubernetes runs on feedback loops
Fatih ArslanKubernetes runs on feedback loopsFor the past few years I've spent most of my time building database operators on top of Kubernetes. Along the way I kept coming back to the same idea: under all the YAML and the moving parts, Kubernetes is really a framework for feedback controllers. It's control theory
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