kubeadm: Default to v1.6.0 stable in offline scenarios in beforehand

cmd/kubeadm/app/apis/kubeadm/v1alpha1/defaults.go

@@ -28,7 +28,7 @@ const (
 	DefaultServicesSubnet    = "10.96.0.0/12"
 	DefaultKubernetesVersion = "latest-1.6"
 	// This is only for clusters without internet, were the latest stable version can't be determined
-	DefaultKubernetesFallbackVersion = "v1.6.0-beta.1"
+	DefaultKubernetesFallbackVersion = "v1.6.0"
 	DefaultAPIBindPort               = 6443
 	DefaultDiscoveryBindPort         = 9898
 	DefaultAuthorizationMode         = "RBAC"
@@ -46,7 +46,7 @@ func addDefaultingFuncs(scheme *runtime.Scheme) error {
 
 func SetDefaults_MasterConfiguration(obj *MasterConfiguration) {
 	if obj.KubernetesVersion == "" {
-		obj.KubernetesVersion = DefaultKubernetesVersion
+		obj.KubernetesVersion = DefaultKubernetesFallbackVersion
 	}
 
 	if obj.API.BindPort == 0 {

cmd/kubeadm/app/cmd/cmd.go

@@ -56,7 +56,7 @@ func NewKubeadmCommand(f cmdutil.Factory, in io.Reader, out, err io.Writer) *cob
 			    ┌──────────────────────────────────────────────────────────┐
 			    │ On the second machine                                    │
 			    ├──────────────────────────────────────────────────────────┤
-			    │ node# kubeadm join --token=<token> <ip-of-master>        │
+			    │ node# kubeadm join --token=<token> <ip-of-master>:<port> │
 			    └──────────────────────────────────────────────────────────┘
 
 			    You can then repeat the second step on as many other machines as you like.

cmd/kubeadm/app/constants/constants.go

@@ -57,7 +57,7 @@ const (
 	SchedulerKubeConfigFileName         = "scheduler.conf"
 
 	// Important: a "v"-prefix shouldn't exist here; semver doesn't allow that
-	MinimumControlPlaneVersion = "1.6.0-beta.1"
+	MinimumControlPlaneVersion = "1.6.0-beta.3"
 
 	// Some well-known users and groups in the core Kubernetes authorization system