CustomResource Spec value returning null - kubernetes

Question

Hi I have created following CustomResourceDefinition - crd.yaml
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: test.demo.k8s.com
namespace: testns
spec:
group: demo.k8s.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
plural: testpod
singular: testpod
kind: testpod
The corresponding resource is as below - cr.yaml
kind: testpod
metadata:
name: testpodcr
namespace: testns
spec:
containers:
- name: testname
image: test/img:v5.16
env:
- name: TESTING_ON
valueFrom:
configMapKeyRef:
name: kubernetes-config
key: type
volumeMounts:
- name: testvol
mountPath: "/test/vol"
readOnly: true
When i use client-go program to fetch the spec value of cr object 'testpodcr' The value comes as null.
func (c *TestConfigclient) AddNewPodForCR(obj *TestPodConfig) *v1.Pod {
log.Println("logging obj \n", obj.Name) // Prints the name as testpodcr
log.Println("Spec value: \n", obj.Spec) //Prints null
dep := &v1.Pod{
ObjectMeta: meta_v1.ObjectMeta{
//Labels: labels,
GenerateName: "test-pod-",
},
Spec: obj.Spec,
}
return dep
}
Can anyone please help in figuring this out why the spec value is resulting to null

Answer 1

There is an error with Your crd.yaml file. I am getting the following error:
$ kubectl apply -f crd.yaml
The CustomResourceDefinition "test.demo.k8s.com" is invalid: metadata.name: Invalid value: "test.demo.k8s.com": must be spec.names.plural+"."+spec.group
In Your configuration the name: test.demo.k8s.com does not match plurar: testpod found in spec.names.
I modified Your crd.yaml and now it works:
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: testpods.demo.k8s.com
namespace: testns
spec:
group: demo.k8s.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
plural: testpods
singular: testpod
kind: Testpod
$ kubectl apply -f crd.yaml
customresourcedefinition.apiextensions.k8s.io/testpods.demo.k8s.com created
After that Your cr.yaml also had to be fixed:
apiVersion: "demo.k8s.com/v1"
kind: Testpod
metadata:
name: testpodcr
namespace: testns
spec:
containers:
- name: testname
image: test/img:v5.16
env:
- name: TESTING_ON
valueFrom:
configMapKeyRef:
name: kubernetes-config
key: type
volumeMounts:
- name: testvol
mountPath: "/test/vol"
readOnly: true
After that I created namespace testns and finally created Testpod object successfully:
$ kubectl create namespace testns
namespace/testns created
$ kubectl apply -f cr.yaml
testpod.demo.k8s.com/testpodcr created