Kubebuilder tutorial https://book.kubebuilder.io/introduction.html Reference https://github.com/mengqiy/kubebuilder-demo https://docs.cert-manager.io/en/latest/getting-started/install/kubernetes.html https://kind.sigs.k8s.io/docs/user/quick-start/ Solved issues: kubernetes-sigs/controller-tools#279 (comment)