Merge pull request kubernetes#75420 from fabriziopandini/fix-kubeadm-…

…init-output

fix kubeadm init output

cmd/kubeadm/app/cmd/init.go

@@ -63,11 +63,25 @@ var (
 		Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
 		  https://kubernetes.io/docs/concepts/cluster-administration/addons/
 
-		You can now join any number of machines by running the following on each node
-		as root:
-
-		  {{.joinCommand}}
-
+		{{if .ControlPlaneEndpoint -}}
+		{{if .UploadCerts -}}
+		You can now join any number of the control-plane node running the following command on each as root:
+					  
+		  {{.joinControlPlaneCommand}}
+					
+		Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
+		As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use 
+		"kubeadm init phase upload-certs --experimental-upload-certs" to reload certs afterward.
+		  
+		{{else -}}
+		You can now join any number of control-plane nodes by copying certificate authorities 
+		and service account keys on each node and then running the following as root:
+				  
+		  {{.joinControlPlaneCommand}}	  
+		  
+		{{end}}{{end}}Then you can join any number of worker nodes by running the following on each as root:
+						  
+		{{.joinWorkerCommand}}
 		`)))
 )
 
@@ -509,14 +523,22 @@ func (d *initData) Tokens() []string {
 }
 
 func printJoinCommand(out io.Writer, adminKubeConfigPath, token string, i *initData) error {
-	joinCommand, err := cmdutil.GetJoinCommand(adminKubeConfigPath, token, i.certificateKey, i.skipTokenPrint, i.uploadCerts, i.skipCertificateKeyPrint)
+	joinControlPlaneCommand, err := cmdutil.GetJoinControlPlaneCommand(adminKubeConfigPath, token, i.certificateKey, i.skipTokenPrint, i.skipCertificateKeyPrint)
+	if err != nil {
+		return err
+	}
+
+	joinWorkerCommand, err := cmdutil.GetJoinWorkerCommand(adminKubeConfigPath, token, i.skipTokenPrint)
 	if err != nil {
 		return err
 	}
 
-	ctx := map[string]string{
-		"KubeConfigPath": adminKubeConfigPath,
-		"joinCommand":    joinCommand,
+	ctx := map[string]interface{}{
+		"KubeConfigPath":          adminKubeConfigPath,
+		"ControlPlaneEndpoint":    i.Cfg().ControlPlaneEndpoint,
+		"UploadCerts":             i.uploadCerts,
+		"joinControlPlaneCommand": joinControlPlaneCommand,
+		"joinWorkerCommand":       joinWorkerCommand,
 	}
 
 	return initDoneTempl.Execute(out, ctx)

cmd/kubeadm/app/cmd/token.go

@@ -228,11 +228,8 @@ func RunCreateToken(out io.Writer, client clientset.Interface, cfgPath string, c
 	// if --print-join-command was specified, print the full `kubeadm join` command
 	// otherwise, just print the token
 	if printJoinCommand {
-		key := ""
 		skipTokenPrint := false
-		uploadCerts := false
-		skipCertificateKeyPrint := false
-		joinCommand, err := cmdutil.GetJoinCommand(kubeConfigFile, internalcfg.BootstrapTokens[0].Token.String(), key, skipTokenPrint, uploadCerts, skipCertificateKeyPrint)
+		joinCommand, err := cmdutil.GetJoinWorkerCommand(kubeConfigFile, internalcfg.BootstrapTokens[0].Token.String(), skipTokenPrint)
 		if err != nil {
 			return errors.Wrap(err, "failed to get join command")
 		}

cmd/kubeadm/app/cmd/util/join.go

@@ -30,19 +30,24 @@ import (
 )
 
 var joinCommandTemplate = template.Must(template.New("join").Parse(`` +
-	`{{if .UploadCerts}}You can now join any number of control-plane node running the following command on each as a root:{{else}}You can now join any number of control-plane node by copying the required certificate authorities on each node and then running the following as root:{{end}}
-	kubeadm join {{.ControlPlaneHostPort}} --token {{.Token}}{{range $h := .CAPubKeyPins}} --discovery-token-ca-cert-hash {{$h}}{{end}} --experimental-control-plane {{if .UploadCerts}}--certificate-key {{.CertificateKey}}
-
-  Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
-  As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use kubeadm init phase upload-certs to reload certs afterward.{{end}}
-	
-  Then you can join any number of worker nodes by running the following on each as root:
-	kubeadm join {{.ControlPlaneHostPort}} --token {{.Token}}{{range $h := .CAPubKeyPins}} --discovery-token-ca-cert-hash {{$h}}{{end}}`,
+	`kubeadm join {{.ControlPlaneHostPort}} --token {{.Token}} \
+    {{range $h := .CAPubKeyPins}}--discovery-token-ca-cert-hash {{$h}} {{end}}{{if .ControlPlane}}\
+    --experimental-control-plane {{if .CertificateKey}}--certificate-key {{.CertificateKey}}{{end}}{{end}}`,
 ))
 
-// GetJoinCommand returns the kubeadm join command for a given token and
+// GetJoinWorkerCommand returns the kubeadm join command for a given token and
 // and Kubernetes cluster (the current cluster in the kubeconfig file)
-func GetJoinCommand(kubeConfigFile, token, key string, skipTokenPrint, uploadCerts, skipCertificateKeyPrint bool) (string, error) {
+func GetJoinWorkerCommand(kubeConfigFile, token string, skipTokenPrint bool) (string, error) {
+	return getJoinCommand(kubeConfigFile, token, "", false, skipTokenPrint, false)
+}
+
+// GetJoinControlPlaneCommand returns the kubeadm join command for a given token and
+// and Kubernetes cluster (the current cluster in the kubeconfig file)
+func GetJoinControlPlaneCommand(kubeConfigFile, token, key string, skipTokenPrint, skipCertificateKeyPrint bool) (string, error) {
+	return getJoinCommand(kubeConfigFile, token, key, true, skipTokenPrint, skipCertificateKeyPrint)
+}
+
+func getJoinCommand(kubeConfigFile, token, key string, controlPlane, skipTokenPrint, skipCertificateKeyPrint bool) (string, error) {
 	// load the kubeconfig file to get the CA certificate and endpoint
 	config, err := clientcmd.LoadFromFile(kubeConfigFile)
 	if err != nil {
@@ -81,8 +86,8 @@ func GetJoinCommand(kubeConfigFile, token, key string, skipTokenPrint, uploadCer
 		"Token":                token,
 		"CAPubKeyPins":         publicKeyPins,
 		"ControlPlaneHostPort": strings.Replace(clusterConfig.Server, "https://", "", -1),
-		"UploadCerts":          uploadCerts,
 		"CertificateKey":       key,
+		"ControlPlane":         controlPlane,
 	}
 
 	if skipTokenPrint {