Scaffold a Kubernetes operator project with Kubebuilder and implement a basic reconcile loop

domain: book.kubebuilder.io · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

  1. Run `kubebuilder init --domain example.com --repo github.com/org/my-operator` to initialize the project
  2. Run `kubebuilder create api --group apps --version v1alpha1 --kind MyApp` to generate the CRD and controller scaffolding
  3. Edit the generated `Reconcile` function in `internal/controller/myapp_controller.go` to fetch the CR with `r.Get`
  4. Implement desired-state logic: create or update child resources (Deployment, Service) using `controllerutil.CreateOrUpdate`
  5. Set owner references on child resources with `controllerutil.SetControllerReference` so garbage collection is automatic
  6. Run `make generate && make manifests` to regenerate deepcopy functions and CRD YAML, then `make run` to test locally

Known gotchas

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