[Issue] no kind "CronTab" is registered for version "stable.example.com/v1" about cnat HOT 8 CLOSED

If you add a type to a scheme, its Go type name is used as kind (via reflection).

Now I also understand what is going on. You are getting a CronTab from the server and the client tries to find a CronTab in its scheme. It only finds a Crontab, which is not helpful. So the server returns an unexpected object. Those two have to match.

Where Crontab is added to the scheme in register.go, you can give a custom name with the capital T. Then it will work too.

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@sttts @mhausenblas thanks for the help. it works.

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Thanks for raising this @yang-wang11 and I'm unsure I follow what exactly your steps were. You mentioned generate-groups.sh (I assume you're referring to https://github.com/kubernetes/code-generator?) Maybe @sttts has a better view?

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@mhausenblas @sttts yes, I follow the book step by step(chapter 4-5). I did the following changes:

1. upgrade to v1 instead of v1alpha1 for CRD
2. remove the sub-resource status for CRD

you may see below code generated from generate-groups.sh, it seems to look good.

var Scheme = runtime.NewScheme()
var Codecs = serializer.NewCodecFactory(Scheme)
var ParameterCodec = runtime.NewParameterCodec(Scheme)
var localSchemeBuilder = runtime.SchemeBuilder{
	stablev1.AddToScheme,
}
var AddToScheme = localSchemeBuilder.AddToScheme

func init() {
	v1.AddToGroupVersion(Scheme, schema.GroupVersion{Version: "v1"})
	utilruntime.Must(AddToScheme(Scheme))
}

I tried to force execute its init function. the error does seem not to disappear.

_ "typedClient/client/clientset/versioned/scheme"

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Note the different spelling: CronTab vs. Crontab. The scheme has the latter, the clients wants the former.

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no kind "CronTab" is registered for version "stable.example.com/v1" in scheme "pkg/crd/typedClient/client/clientset/versioned/scheme/register.go:15"

Is this a copy-and-pasted error message? Am not sure where client-gen gets the CronTab type from. It is based on the Go type, not the CRD yaml. Hence, it should print a "Crontab" error, not "CronTab" 🤔

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@sttts thanks for the help.
I'm a little confused, is that mean I need to rename my go type from Crontab to CronTab? like below

func addKnownTypes(scheme *runtime.Scheme) error {
	scheme.AddKnownTypes(SchemeGroupVersion,
		&CronTabList{},
		&CronTab{},
	)
	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
	return nil
}

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no kind "CronTab" is registered for version "stable.example.com/v1" in scheme "pkg/crd/typedClient/client/clientset/versioned/scheme/register.go:15"

Is this a copy-and-pasted error message? Am not sure where client-gen gets the CronTab type from. It is based on the Go type, not the CRD yaml. Hence, it should print a "Crontab" error, not "CronTab" 🤔

yes, this error message copy from the console.

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