I removed the should-be-totally-unnecessary code for NP from pkg/apis/extensions - leaving it in pkg/apis/extensions/v1beta1 It compiles. I can POST a networking/v1 object, and it is stored in etcd as extensions/v1beta1 - yay! I can NOT POST an extensions/v1beta1 object. ``` $ cat /tmp/netpol.yaml apiVersion: extensions/v1beta1 kind: NetworkPolicy metadata: name: my-netpol spec: podSelector: {} $ kubectl create -f /tmp/netpol.yaml error: error validating "/tmp/netpol.yaml": error validating data: couldn't find type: v1beta1.NetworkPolicy; if you choose to ignore these errors, turn validation off with --validate=false $ kubectl create -f /tmp/netpol.yaml --validate=false error: unable to recognize "/tmp/netpol.yaml": no matches for extensions/, Kind=NetworkPolicy ``` Looking up that 2nd error, I get to staging/src/ k8s.io/apimachinery/pkg/api/meta/multirestmapper.go, where I see things like: ``` return nil, &NoKindMatchError{PartialKind: gk.WithVersion("")} ``` ...and I am lost https://github.com/kubernetes/kubernetes/compare/master...thockin:pr-39164-plus?expand=1 At this point, I am stopping my investigation. I don't have time to crawl around. If the worst problem we have is duplicated code, I guess I will live. It does feel like this should be possible.