Fix wrong guide for egress selection.

[lshgdut]

This PR fix the wrong guide according to the commit bellow:

apiserver: support egress selection name 'controlplane' and deprecate 'master'

[linux-foundation-easycla]

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• ✅ login: lshgdut / name: monk (abcf77f)

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[divya-mohan0209]

Hey @lshgdut , thank you for your contribution! I'd rather we have this change technically approved & signed off in one language i.e. English & then replicated via PRs in different languages.

[lshgdut]

Hey @lshgdut , thank you for your contribution! I'd rather we have this change technically approved & signed off in one language i.e. English & then replicated via PRs in different languages.

OK! I have reverted files changed except English.

[divya-mohan0209]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: divya-mohan0209

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[lshgdut]

/approve

I'm sorry. I have force pushed again to correct the commit message.

[kbhawkey]

Hi @lshgdut . Thanks for contributing.
Do you know if controlplane is an accepted value? I am trying to locate information about this change.

[lshgdut]

The ref commit is here kubernetes/kubernetes@a0aebf9

# file: staging/src/k8s.io/apiserver/pkg/server/egressselector/egress_selector.go
func lookupServiceName(name string) (EgressType, error) {
	switch strings.ToLower(name) {
	// 'master' is deprecated, interpret "master" as controlplane internally until removed in v1.22.
	case "master":
		klog.Warning("EgressSelection name 'master' is deprecated, use 'controlplane' instead")
		return ControlPlane, nil
	case "controlplane":
		return ControlPlane, nil
	case "etcd":
		return Etcd, nil
	case "cluster":
		return Cluster, nil
	}
	return -1, fmt.Errorf("unrecognized service name %s", name)
}

BTW, the "master" value is also accepted but deprecated, it will automatically convert to "controlplane".

Please take a look at staging/src/k8s.io/apiserver/pkg/apis/apiserver/v1alpha1/conversion.go

func Convert_v1alpha1_EgressSelection_To_apiserver_EgressSelection(in *EgressSelection, out *apiserver.EgressSelection, s conversion.Scope) error {
	if err := autoConvert_v1alpha1_EgressSelection_To_apiserver_EgressSelection(in, out, s); err != nil {
		return err
	}
	if out.Name == "master" {
		out.Name = "controlplane"
	}
	return nil
}

[kbhawkey]

Thanks for the information!

[kbhawkey]

Thanks @lshgdut

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 74f066cdb93eb6acec8b3b6ec78008aaeb2665b5