codec := apitesting.TestCodec(codecs, examplev1.SchemeGroupVersion)

	certFile, keyFile, caFile := configureTLSCerts(t)
	defer os.RemoveAll(filepath.Dir(certFile))

	// override server config to be TLS-enabled
	etcdConfig := testserver.NewTestConfig(t)
	etcdConfig.ClientTLSInfo = transport.TLSInfo{
		CertFile:      certFile,
		KeyFile:       keyFile,
		TrustedCAFile: caFile,
	}
	for i := range etcdConfig.ListenClientUrls {

func GenerateKeyAndCertificate(subject, dir string) (string, string, error) {
	keyFile := filepath.Join(dir, fmt.Sprintf("%s-key.pem", subject))
	crtFile := filepath.Join(dir, fmt.Sprintf("%s-cert.pem", subject))
	if err := openssl(
		"req", "-x509", "-sha256", "-nodes",
		"-days", "365", "-newkey", "rsa:2048",
		"-subj", fmt.Sprintf("/CN=%s", subject),
		"-keyout", keyFile,
		"-out", crtFile,
	); err != nil {

// IntermediateCA is an intermediate CA for a single cluster.
type Intermediate struct {
	KeyFile  string
	ConfFile string
	CSRFile  string
	CertFile string
	Root     Root
}

// NewIntermediate creates a new intermediate CA for the given cluster.
func NewIntermediate(workDir, config string, root Root) (Intermediate, error) {
	ca := Intermediate{
		KeyFile:  filepath.Join(workDir, "ca-key.pem"),
		ConfFile: filepath.Join(workDir, "ca.conf"),

	}

	// Create the root key.
	if err := cert.GenerateKey(root.KeyFile); err != nil {
		return Root{}, err
	}

	// Create the root CSR
	if err := cert.GenerateCSR(root.ConfFile, root.KeyFile, root.CSRFile); err != nil {
		return Root{}, err
	}

	// Create the root cert
	if err := cert.GenerateCert(root.ConfFile, root.CSRFile, root.KeyFile, root.CertFile); err != nil {
		return Root{}, err
	}
	return root, nil

			CertFile: "/cluster-signing-kubelet-serving/cert-file",
			KeyFile:  "/cluster-signing-kubelet-serving/key-file",
		},
		KubeletClientSignerConfiguration: csrsigningconfig.CSRSigningConfiguration{
			CertFile: "/cluster-signing-kubelet-client/cert-file",
			KeyFile:  "/cluster-signing-kubelet-client/key-file",
		},

						CertFile: "/cluster-signing-kubelet-serving/cert-file",
						KeyFile:  "",
					},
					KubeletClientSignerConfiguration: csrsigningconfig.CSRSigningConfiguration{
						CertFile: "",
						KeyFile:  "",
					},
					KubeAPIServerClientSignerConfiguration: csrsigningconfig.CSRSigningConfiguration{
						CertFile: "",
						KeyFile:  "",
					},

	serveFunc := func() error {
		return http.ListenAndServe(":8080", nil)
	}

	if certFile != "" || keyFile != "" {
		if certFile == "" || keyFile == "" {
			log.Fatal("Please provide both a key file and a cert file to enable TLS.")
		}
		serveFunc = func() error {
			return http.ListenAndServeTLS(":8080", certFile, keyFile, nil)
		}
	}

	http.HandleFunc("/", mainHandler)

	log.Print("Listening on :8080")

	if err != nil {
		klog.ErrorS(err, "invalid certificate and key pair from file", "certFile", m.certFile, "keyFile", m.keyFile)
		return
	}
	m.currentTLSCertificate.Store(&cert)
	klog.V(4).InfoS("loaded certificate and key pair in kubelet server certificate manager", "certFile", m.certFile, "keyFile", m.keyFile)
}

// Current returns the last valid certificate key pair loaded from files.

	CertFile string
	// KeyFile is a file containing a PEM-encoded private key for the certificate specified by CertFile
	KeyFile string
}

type GeneratableKeyCert struct {
	// CertKey allows setting an explicit cert/key file to use.
	CertKey CertKey

	// CertDirectory specifies a directory to write generated certificates to if CertFile/KeyFile aren't explicitly set.

func NewDynamicServingContentFromFiles(purpose, certFile, keyFile string) (*DynamicCertKeyPairContent, error) {
	if len(certFile) == 0 || len(keyFile) == 0 {
		return nil, fmt.Errorf("missing filename for serving cert")
	}
	name := fmt.Sprintf("%s::%s::%s", purpose, certFile, keyFile)

	ret := &DynamicCertKeyPairContent{
		name:     name,
		certFile: certFile,
		keyFile:  keyFile,
		queue: workqueue.NewTypedRateLimitingQueueWithConfig(