how to reuse k8s validation in my own CRD controller

You would need to import a couple packages first:

import (    "k8s.io/kubernetes/pkg/apis/core/validation"    "k8s.io/apimachinery/pkg/util/validation/field")

Then make use of ValidatePodSpec in your controller method:

errs := validation.ValidatePodSpec(instance.podSpec, field.NewPath("podSpec"))

kubernetes openapi kubebuilder

Also desire such a functionality to be provided as a library. There is a comment about using go get for k8s.io/kubernetes upstream.https://github.com/kubernetes/kubernetes/issues/80316#issuecomment-512991205And the issue that is caused by using wrong configuration for PodTemplateSpec could be found here https://github.com/googleforgames/agones/issues/1298Namely: we create a CRD successfully, however it become unhealthy later because pod could not be created.

CodeHunter