Make the Kubernetes control plane version configurable

cmd/kubeadm/app/api/types.go

@@ -54,6 +54,9 @@ type InitFlags struct {
 	PodNetwork struct {
 		CIDR net.IPNet
 	}
+	Versions struct {
+		Kubernetes string
+	}
 	CloudProvider string
 	Schedulable   bool
 }
@@ -61,6 +64,7 @@ type InitFlags struct {
 const (
 	DefaultServiceDNSDomain   = "cluster.local"
 	DefaultServicesCIDRString = "100.64.0.0/12"
+	DefaultKubernetesVersion  = "v1.4.0-beta.10"
 )
 
 var (

cmd/kubeadm/app/cmd/init.go

@@ -86,9 +86,12 @@ func NewCmdInit(out io.Writer, s *kubeadmapi.KubeadmConfig) *cobra.Command {
 		&s.InitFlags.Schedulable, "schedule-pods-here", false,
 		`(optional) Allow to schedule workload to the node`,
 	)
+	cmd.PersistentFlags().StringVar(
+		&s.InitFlags.Versions.Kubernetes, "use-kubernetes-version", kubeadmapi.DefaultKubernetesVersion,
+		`(optional) Choose a specific Kubernetes version for the control plane`,
+	)
 
 	// TODO (phase1+) @errordeveloper make the flags below not show up in --help but rather on --advanced-help
-
 	cmd.PersistentFlags().StringSliceVar(
 		&s.InitFlags.API.Etcd.ExternalEndpoints, "external-etcd-endpoints", []string{},
 		`(optional) etcd endpoints to use, in case you have an external cluster.`,

cmd/kubeadm/app/cmd/join.go

@@ -52,8 +52,8 @@ func NewCmdJoin(out io.Writer, s *kubeadmapi.KubeadmConfig) *cobra.Command {
 		},
 	}
 
-	cmd.PersistentFlags().StringVarP(
+	cmd.PersistentFlags().StringVar(
-		&s.Secrets.GivenToken, "token", "", "",
+		&s.Secrets.GivenToken, "token", "",
 		`Shared secret used to secure bootstrap. Must match the output of 'kubeadm init'.`,
 	)
 

cmd/kubeadm/app/images/images.go

@@ -19,6 +19,8 @@ package images
 import (
 	"fmt"
 	"runtime"
+
+	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/api"
 )
 
 const (
@@ -41,20 +43,17 @@ const (
 	exechealthzVersion = "1.1"
 )
 
-// TODO(phase1): Make this configurable + default to a v1.4 value fetched from: https://storage.googleapis.com/kubernetes-release/release/stable.txt
+func GetCoreImage(image string, cfg *kubeadmapi.KubeadmConfig, overrideImage string) string {
-var DefaultKubeVersion = "v1.4.0-beta.8"
-
-func GetCoreImage(image string, overrideImage string) string {
 	if overrideImage != "" {
 		return overrideImage
 	}
 
 	return map[string]string{
 		KubeEtcdImage:              fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "etcd", runtime.GOARCH, etcdVersion),
-		KubeAPIServerImage:         fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-apiserver", runtime.GOARCH, DefaultKubeVersion),
+		KubeAPIServerImage:         fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-apiserver", runtime.GOARCH, cfg.Versions.Kubernetes),
-		KubeControllerManagerImage: fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-controller-manager", runtime.GOARCH, DefaultKubeVersion),
+		KubeControllerManagerImage: fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-controller-manager", runtime.GOARCH, cfg.Versions.Kubernetes),
-		KubeSchedulerImage:         fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-scheduler", runtime.GOARCH, DefaultKubeVersion),
+		KubeSchedulerImage:         fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-scheduler", runtime.GOARCH, cfg.Versions.Kubernetes),
-		KubeProxyImage:             fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-proxy", runtime.GOARCH, DefaultKubeVersion),
+		KubeProxyImage:             fmt.Sprintf("%s/%s-%s:%s", gcrPrefix, "kube-proxy", runtime.GOARCH, cfg.Versions.Kubernetes),
 	}[image]
 }
 

cmd/kubeadm/app/master/addons.go

@@ -40,7 +40,7 @@ func createKubeProxyPodSpec(s *kubeadmapi.KubeadmConfig, architecture string) ap
 		},
 		Containers: []api.Container{{
 			Name:            kubeProxy,
-			Image:           images.GetCoreImage(images.KubeProxyImage, s.EnvParams["hyperkube_image"]),
+			Image:           images.GetCoreImage(images.KubeProxyImage, s, s.EnvParams["hyperkube_image"]),
 			Command:         append(getComponentCommand("proxy", s), "--kubeconfig=/run/kubeconfig"),
 			SecurityContext: &api.SecurityContext{Privileged: &privilegedTrue},
 			VolumeMounts: []api.VolumeMount{

cmd/kubeadm/app/master/manifests.go

@@ -59,7 +59,7 @@ func WriteStaticPodManifests(s *kubeadmapi.KubeadmConfig) error {
 	staticPodSpecs := map[string]api.Pod{
 		kubeAPIServer: componentPod(api.Container{
 			Name:          kubeAPIServer,
-			Image:         images.GetCoreImage(images.KubeAPIServerImage, s.EnvParams["hyperkube_image"]),
+			Image:         images.GetCoreImage(images.KubeAPIServerImage, s, s.EnvParams["hyperkube_image"]),
 			Command:       getComponentCommand(apiServer, s),
 			VolumeMounts:  []api.VolumeMount{certsVolumeMount(), k8sVolumeMount()},
 			LivenessProbe: componentProbe(8080, "/healthz"),
@@ -67,7 +67,7 @@ func WriteStaticPodManifests(s *kubeadmapi.KubeadmConfig) error {
 		}, certsVolume(s), k8sVolume(s)),
 		kubeControllerManager: componentPod(api.Container{
 			Name:          kubeControllerManager,
-			Image:         images.GetCoreImage(images.KubeControllerManagerImage, s.EnvParams["hyperkube_image"]),
+			Image:         images.GetCoreImage(images.KubeControllerManagerImage, s, s.EnvParams["hyperkube_image"]),
 			Command:       getComponentCommand(controllerManager, s),
 			VolumeMounts:  []api.VolumeMount{k8sVolumeMount()},
 			LivenessProbe: componentProbe(10252, "/healthz"),
@@ -75,7 +75,7 @@ func WriteStaticPodManifests(s *kubeadmapi.KubeadmConfig) error {
 		}, k8sVolume(s)),
 		kubeScheduler: componentPod(api.Container{
 			Name:          kubeScheduler,
-			Image:         images.GetCoreImage(images.KubeSchedulerImage, s.EnvParams["hyperkube_image"]),
+			Image:         images.GetCoreImage(images.KubeSchedulerImage, s, s.EnvParams["hyperkube_image"]),
 			Command:       getComponentCommand(scheduler, s),
 			LivenessProbe: componentProbe(10251, "/healthz"),
 			Resources:     componentResources("100m"),
@@ -93,7 +93,7 @@ func WriteStaticPodManifests(s *kubeadmapi.KubeadmConfig) error {
 				"--data-dir=/var/etcd/data",
 			},
 			VolumeMounts:  []api.VolumeMount{certsVolumeMount(), etcdVolumeMount(), k8sVolumeMount()},
-			Image:         images.GetCoreImage(images.KubeEtcdImage, s.EnvParams["etcd_image"]),
+			Image:         images.GetCoreImage(images.KubeEtcdImage, s, s.EnvParams["etcd_image"]),
 			LivenessProbe: componentProbe(2379, "/health"),
 			Resources:     componentResources("200m"),
 			SecurityContext: &api.SecurityContext{

hack/verify-flags/known-flags.txt

@@ -532,6 +532,7 @@ update-period
 upgrade-image
 upgrade-target
 use-kubernetes-cluster-service
+use-kubernetes-version
 user-whitelist
 verify-only
 volume-dir