kubeadm: use kubelet bootstrap instead of reimplementing

build/debs/kubeadm-10.conf

 [Service]
-Environment="KUBELET_KUBECONFIG_ARGS=--kubeconfig=/etc/kubernetes/kubelet.conf"
+Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
 Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true"
 Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
 Environment="KUBELET_DNS_ARGS=--cluster-dns=10.96.0.10 --cluster-domain=cluster.local"

cmd/kubeadm/app/cmd/BUILD

@@ -27,7 +27,6 @@ go_library(
         "//cmd/kubeadm/app/cmd/phases:go_default_library",
         "//cmd/kubeadm/app/constants:go_default_library",
         "//cmd/kubeadm/app/discovery:go_default_library",
-        "//cmd/kubeadm/app/node:go_default_library",
         "//cmd/kubeadm/app/phases/addons:go_default_library",
         "//cmd/kubeadm/app/phases/apiconfig:go_default_library",
         "//cmd/kubeadm/app/phases/controlplane:go_default_library",
@@ -46,7 +45,6 @@ go_library(
         "//pkg/printers:go_default_library",
         "//pkg/util/i18n:go_default_library",
         "//pkg/util/initsystem:go_default_library",
-        "//pkg/util/node:go_default_library",
         "//pkg/util/version:go_default_library",
         "//pkg/version:go_default_library",
         "//vendor/github.com/ghodss/yaml:go_default_library",

cmd/kubeadm/app/cmd/join.go

@@ -32,12 +32,10 @@ import (
 	"k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/validation"
 	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
 	"k8s.io/kubernetes/cmd/kubeadm/app/discovery"
-	kubeadmnode "k8s.io/kubernetes/cmd/kubeadm/app/node"
 	"k8s.io/kubernetes/cmd/kubeadm/app/preflight"
 	kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
 	kubeconfigutil "k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig"
 	"k8s.io/kubernetes/pkg/api"
-	nodeutil "k8s.io/kubernetes/pkg/util/node"
 )
 
 var (
@@ -178,20 +176,7 @@ func (j *Join) Run(out io.Writer) error {
 		return err
 	}
 
-	hostname := nodeutil.GetHostname(j.cfg.NodeName)
-
-	client, err := kubeconfigutil.KubeConfigToClientSet(cfg)
-	if err != nil {
-		return err
-	}
-	if err := kubeadmnode.ValidateAPIServer(client); err != nil {
-		return err
-	}
-	if err := kubeadmnode.PerformTLSBootstrap(cfg, hostname); err != nil {
-		return err
-	}
-
-	kubeconfigFile := filepath.Join(kubeadmconstants.KubernetesDir, kubeadmconstants.KubeletKubeConfigFileName)
+	kubeconfigFile := filepath.Join(kubeadmconstants.KubernetesDir, kubeadmconstants.KubeletBootstrapKubeConfigFileName)
 	if err := kubeconfigutil.WriteToDisk(kubeconfigFile, cfg); err != nil {
 		return err
 	}

cmd/kubeadm/app/constants/constants.go

@@ -59,6 +59,7 @@ const (
 	FrontProxyClientCertCommonName     = "front-proxy-client" //used as subject.commonname attribute (CN)
 
 	AdminKubeConfigFileName             = "admin.conf"
+	KubeletBootstrapKubeConfigFileName  = "bootstrap-kubelet.conf"
 	KubeletKubeConfigFileName           = "kubelet.conf"
 	ControllerManagerKubeConfigFileName = "controller-manager.conf"
 	SchedulerKubeConfigFileName         = "scheduler.conf"

cmd/kubeadm/app/node/BUILD

@@ -10,19 +10,11 @@ load(
 
 go_library(
     name = "go_default_library",
-    srcs = [
-        "csr.go",
-        "validate.go",
-    ],
+    srcs = ["validate.go"],
     tags = ["automanaged"],
     deps = [
-        "//cmd/kubeadm/app/util/kubeconfig:go_default_library",
-        "//pkg/kubelet/util/csr:go_default_library",
         "//vendor/k8s.io/api/certificates/v1beta1:go_default_library",
-        "//vendor/k8s.io/apimachinery/pkg/types:go_default_library",
         "//vendor/k8s.io/client-go/kubernetes:go_default_library",
-        "//vendor/k8s.io/client-go/tools/clientcmd/api:go_default_library",
-        "//vendor/k8s.io/client-go/util/cert:go_default_library",
     ],
 )
 

cmd/kubeadm/app/node/csr.go

-/*
-Copyright 2016 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package node
-
-import (
-	"fmt"
-
-	"k8s.io/apimachinery/pkg/types"
-	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
-	certutil "k8s.io/client-go/util/cert"
-	kubeconfigutil "k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig"
-	"k8s.io/kubernetes/pkg/kubelet/util/csr"
-)
-
-const CSRContextAndUser = "kubelet-csr"
-
-// PerformTLSBootstrap executes a node certificate signing request.
-func PerformTLSBootstrap(cfg *clientcmdapi.Config, hostName string) error {
-	client, err := kubeconfigutil.KubeConfigToClientSet(cfg)
-	if err != nil {
-		return err
-	}
-
-	fmt.Println("[csr] Created API client to obtain unique certificate for this node, generating keys and certificate signing request")
-
-	key, err := certutil.MakeEllipticPrivateKeyPEM()
-	if err != nil {
-		return fmt.Errorf("failed to generate private key [%v]", err)
-	}
-
-	cert, err := csr.RequestNodeCertificate(client.CertificatesV1beta1().CertificateSigningRequests(), key, types.NodeName(hostName))
-	if err != nil {
-		return fmt.Errorf("failed to request signed certificate from the API server [%v]", err)
-	}
-	fmt.Println("[csr] Received signed certificate from the API server, generating KubeConfig...")
-
-	cfg.AuthInfos[CSRContextAndUser] = &clientcmdapi.AuthInfo{
-		ClientKeyData:         key,
-		ClientCertificateData: cert,
-	}
-	cfg.Contexts[CSRContextAndUser] = &clientcmdapi.Context{
-		AuthInfo: CSRContextAndUser,
-		Cluster:  cfg.Contexts[cfg.CurrentContext].Cluster,
-	}
-	cfg.CurrentContext = CSRContextAndUser
-	return nil
-}

hack/.golint_failures

@@ -18,7 +18,6 @@ cmd/kubeadm/app/discovery
 cmd/kubeadm/app/discovery/file
 cmd/kubeadm/app/discovery/token
 cmd/kubeadm/app/images
-cmd/kubeadm/app/node
 cmd/kubeadm/app/phases/addons
 cmd/kubeadm/app/phases/certs/pkiutil
 cmd/kubeadm/app/phases/token