Add port constants

cmd/kubeadm/app/preflight/BUILD

@@ -23,6 +23,7 @@ go_library(
         "//cmd/kubeadm/app/images:go_default_library",
         "//cmd/kubeadm/app/util/runtime:go_default_library",
         "//cmd/kubeadm/app/util/system:go_default_library",
+        "//pkg/master/ports:go_default_library",
         "//pkg/registry/core/service/ipallocator:go_default_library",
         "//pkg/util/initsystem:go_default_library",
         "//pkg/util/ipvs:go_default_library",

cmd/kubeadm/app/preflight/checks.go

@@ -46,6 +46,7 @@ import (
 	"k8s.io/kubernetes/cmd/kubeadm/app/images"
 	utilruntime "k8s.io/kubernetes/cmd/kubeadm/app/util/runtime"
 	"k8s.io/kubernetes/cmd/kubeadm/app/util/system"
+	"k8s.io/kubernetes/pkg/master/ports"
 	"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
 	"k8s.io/kubernetes/pkg/util/initsystem"
 	ipvsutil "k8s.io/kubernetes/pkg/util/ipvs"
@@ -882,10 +883,10 @@ func RunInitNodeChecks(execer utilsexec.Interface, cfg *kubeadmapi.InitConfigura
 	checks := []Checker{
 		NumCPUCheck{NumCPU: kubeadmconstants.ControlPlaneNumCPU},
 		KubernetesVersionCheck{KubernetesVersion: cfg.KubernetesVersion, KubeadmVersion: kubeadmversion.Get().GitVersion},
-		FirewalldCheck{ports: []int{int(cfg.LocalAPIEndpoint.BindPort), 10250}},
+		FirewalldCheck{ports: []int{int(cfg.LocalAPIEndpoint.BindPort), ports.KubeletPort}},
 		PortOpenCheck{port: int(cfg.LocalAPIEndpoint.BindPort)},
-		PortOpenCheck{port: 10251},
-		PortOpenCheck{port: 10252},
+		PortOpenCheck{port: ports.InsecureSchedulerPort},
+		PortOpenCheck{port: ports.InsecureKubeControllerManagerPort},
 		FileAvailableCheck{Path: kubeadmconstants.GetStaticPodFilepath(kubeadmconstants.KubeAPIServer, manifestsDir)},
 		FileAvailableCheck{Path: kubeadmconstants.GetStaticPodFilepath(kubeadmconstants.KubeControllerManager, manifestsDir)},
 		FileAvailableCheck{Path: kubeadmconstants.GetStaticPodFilepath(kubeadmconstants.KubeScheduler, manifestsDir)},