kubernetes custom resource definition required field - kubernetes

Question

I am trying to write a kubernetes crd validation schema. I have an array (vc) of structures and one of the fields in those structures is required (name field).
I tried looking through various examples but it doesn't generate error when name is not there. Any suggestions what is wrong ?
vc:
type: array
items:
type: object
properties:
name:
type: string
address:
type: string
required:
- name

Answer 1

If you are on v1.8, you will need to enable the CustomResourceValidation feature gate for using the validation feature. This can be done by using the following flag on kube-apiserver:
--feature-gates=CustomResourceValidation=true
Here is an example of it working (I tested this on v1.12, but this should work on earlier versions as well):
The CRD:
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: foos.stable.example.com
spec:
group: stable.example.com
versions:
- name: v1
served: true
storage: true
version: v1
scope: Namespaced
names:
plural: foos
singular: foo
kind: Foo
validation:
openAPIV3Schema:
properties:
spec:
properties:
vc:
type: array
items:
type: object
properties:
name:
type: string
address:
type: string
required:
- name
The custom resource:
apiVersion: "stable.example.com/v1"
kind: Foo
metadata:
name: new-foo
spec:
vc:
- address: "bar"
Create the CRD.
kubectl create -f crd.yaml
customresourcedefinition.apiextensions.k8s.io/foos.stable.example.com created
Get the CRD and check if the validation field exists in the output. If it doesn't, you probably don't have the feature gate turned on.
kubectl get crd foos.stable.example.com -oyaml
Try to create the custom resource. This should fail with:
kubectl create -f cr-validation.yaml
The Foo "new-foo" is invalid: []: Invalid value: map[string]interface {}{"metadata":map[string]interface {}{"creationTimestamp":"2018-11-18T19:45:23Z", "generation":1, "uid":"7d7f8f0b-eb6a-11e8-b861-54e1ad9de0be", "name":"new-foo", "namespace":"default"}, "spec":map[string]interface {}{"vc":[]interface {}{map[string]interface {}{"address":"bar"}}}, "apiVersion":"stable.example.com/v1", "kind":"Foo"}: validation failure list:
spec.vc.name in body is required