Building Your First Kubernetes Operator in Go

Operators look intimidating until you’ve written a reconcile loop once. This walks through scaffolding one with kubebuilder and wiring up a basic controller.

Scaffolding

kubebuilder init --domain example.com --repo github.com/example/operator
kubebuilder create api --group apps --version v1 --kind Widget

The reconcile loop

The reconcile function is just a function from desired state to actions — treat it like a pure function wherever you can.