How Kubernetes operators function as feedback controllers for running stateful workloads at scale
Summary
An in-depth technical exploration of Kubernetes operators as feedback controllers, explaining how they reconcile desired state through closed-loop control systems. The author draws on a decade of experience operating Kubernetes clusters and running stateful systems like Postgres and MySQL at PlanetScale, arguing that Kubernetes' true power lies in its framework for building feedback loops that enable running workloads at massive scale.
Source
bskyHow Kubernetes operators function as feedback controllers for running stateful workloads at scaleplanetscale.comKey quotes
· 3 pulledPeople ask me what an operator actually does. The canonical answer is: 'it reconciles desired state.' This is correct, but it also tells you almost nothing.
An operator is a feedback controller. It's the same closed loop that
Kubernetes is a framework for feedback controllers: write down what you want, observe what exists, make the next change, and repeat.
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