Configure the master to connect to the kubelet using HTTPS.

cmd/kube-apiserver/app/server.go

@@ -99,7 +99,7 @@ func NewAPIServer() *APIServer {
 		RuntimeConfig: make(util.ConfigurationMap),
 		KubeletConfig: client.KubeletConfig{
 			Port:        10250,
-			EnableHttps: false,
+			EnableHttps: true,
 			HTTPTimeout: time.Duration(5) * time.Second,
 		},
 	}

cmd/kube-controller-manager/app/controllermanager.go

@@ -83,7 +83,7 @@ func NewCMServer() *CMServer {
 		SyncNodeStatus:          false,
 		KubeletConfig: client.KubeletConfig{
 			Port:        ports.KubeletPort,
-			EnableHttps: false,
+			EnableHttps: true,
 			HTTPTimeout: time.Duration(5) * time.Second,
 		},
 	}

pkg/apiserver/apiserver.go

@@ -139,14 +139,7 @@ func (g *APIGroupVersion) InstallREST(container *restful.Container) error {
 
 // TODO: Convert to go-restful
 func InstallValidator(mux Mux, servers func() map[string]Server) {
-	validator, err := NewValidator(servers)
+	mux.Handle("/validate", NewValidator(servers))
-	if err != nil {
-		glog.Errorf("failed to set up validator: %v", err)
-		return
-	}
-	if validator != nil {
-		mux.Handle("/validate", validator)
-	}
 }
 
 // TODO: document all handlers

pkg/apiserver/validator.go

@@ -17,6 +17,7 @@ limitations under the License.
 package apiserver
 
 import (
+	"crypto/tls"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -34,21 +35,26 @@ type httpGet interface {
 }
 
 type Server struct {
-	Addr string
+	Addr        string
-	Port int
+	Port        int
-	Path string
+	Path        string
+	EnableHTTPS bool
 }
 
 // validator is responsible for validating the cluster and serving
 type validator struct {
 	// a list of servers to health check
 	servers func() map[string]Server
-	client  httpGet
+	rt      http.RoundTripper
 }
 
 // TODO: can this use pkg/probe/http
 func (s *Server) check(client httpGet) (probe.Result, string, error) {
-	resp, err := client.Get("http://" + net.JoinHostPort(s.Addr, strconv.Itoa(s.Port)) + s.Path)
+	scheme := "http://"
+	if s.EnableHTTPS {
+		scheme = "https://"
+	}
+	resp, err := client.Get(scheme + net.JoinHostPort(s.Addr, strconv.Itoa(s.Port)) + s.Path)
 	if err != nil {
 		return probe.Unknown, "", err
 	}
@@ -81,7 +87,22 @@ func (v *validator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	reply := []ServerStatus{}
 	for name, server := range v.servers() {
-		status, msg, err := server.check(v.client)
+		transport := v.rt
+		if server.EnableHTTPS {
+			// TODO(roberthbailey): The servers that use HTTPS are currently the
+			// kubelets, and we should be using a standard kubelet client library
+			// to talk to them rather than a separate http client.
+			transport = &http.Transport{
+				Proxy: http.ProxyFromEnvironment,
+				Dial: (&net.Dialer{
+					Timeout:   30 * time.Second,
+					KeepAlive: 30 * time.Second,
+				}).Dial,
+				TLSHandshakeTimeout: 10 * time.Second,
+				TLSClientConfig:     &tls.Config{InsecureSkipVerify: true},
+			}
+		}
+		status, msg, err := server.check(&http.Client{Transport: transport})
 		var errorMsg string
 		if err != nil {
 			errorMsg = err.Error()
@@ -103,30 +124,6 @@ func (v *validator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 // NewValidator creates a validator for a set of servers.
-func NewValidator(servers func() map[string]Server) (http.Handler, error) {
+func NewValidator(servers func() map[string]Server) http.Handler {
-	return &validator{
+	return &validator{servers: servers, rt: http.DefaultTransport}
-		servers: servers,
-		client:  &http.Client{},
-	}, nil
-}
-
-func makeTestValidator(servers map[string]string, get httpGet) (http.Handler, error) {
-	result := map[string]Server{}
-	for name, value := range servers {
-		host, port, err := net.SplitHostPort(value)
-		if err != nil {
-			return nil, fmt.Errorf("invalid server spec: %s (%v)", value, err)
-		}
-		val, err := strconv.Atoi(port)
-		if err != nil {
-			return nil, fmt.Errorf("invalid server spec: %s (%v)", port, err)
-		}
-		result[name] = Server{Addr: host, Port: val, Path: "/healthz"}
-	}
-
-	v, e := NewValidator(func() map[string]Server { return result })
-	if e == nil {
-		v.(*validator).client = get
-	}
-	return v, e
 }

pkg/apiserver/validator_test.go

@@ -21,35 +21,27 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"net/http/httptest"
+	"strconv"
 	"testing"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/probe"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
-type fakeHttpGet struct {
+type fakeRoundTripper struct {
 	err  error
 	resp *http.Response
 	url  string
 }
 
-func (f *fakeHttpGet) Get(url string) (*http.Response, error) {
+func (f *fakeRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
-	f.url = url
+	f.url = req.URL.String()
 	return f.resp, f.err
 }
 
-func makeFake(data string, statusCode int, err error) *fakeHttpGet {
-	return &fakeHttpGet{
-		err: err,
-		resp: &http.Response{
-			Body:       ioutil.NopCloser(bytes.NewBufferString(data)),
-			StatusCode: statusCode,
-		},
-	}
-}
-
 func TestValidate(t *testing.T) {
 	tests := []struct {
 		err            error
@@ -66,11 +58,18 @@ func TestValidate(t *testing.T) {
 	s := Server{Addr: "foo.com", Port: 8080, Path: "/healthz"}
 
 	for _, test := range tests {
-		fake := makeFake(test.data, test.code, test.err)
+		fakeRT := &fakeRoundTripper{
+			err: test.err,
+			resp: &http.Response{
+				Body:       ioutil.NopCloser(bytes.NewBufferString(test.data)),
+				StatusCode: test.code,
+			},
+		}
+		fake := &http.Client{Transport: fakeRT}
 		status, data, err := s.check(fake)
 		expect := fmt.Sprintf("http://%s:%d/healthz", s.Addr, s.Port)
-		if fake.url != expect {
+		if fakeRT.url != expect {
-			t.Errorf("expected %s, got %s", expect, fake.url)
+			t.Errorf("expected %s, got %s", expect, fakeRT.url)
 		}
 		if test.expectErr && err == nil {
 			t.Errorf("unexpected non-error")
@@ -87,8 +86,30 @@ func TestValidate(t *testing.T) {
 	}
 }
 
+func makeTestValidator(servers map[string]string, rt http.RoundTripper) (http.Handler, error) {
+	result := map[string]Server{}
+	for name, value := range servers {
+		host, port, err := net.SplitHostPort(value)
+		if err != nil {
+			return nil, fmt.Errorf("invalid server spec: %s (%v)", value, err)
+		}
+		val, err := strconv.Atoi(port)
+		if err != nil {
+			return nil, fmt.Errorf("invalid server spec: %s (%v)", port, err)
+		}
+		result[name] = Server{Addr: host, Port: val, Path: "/healthz"}
+	}
+
+	return &validator{servers: func() map[string]Server { return result }, rt: rt}, nil
+}
+
 func TestValidator(t *testing.T) {
-	fake := makeFake("foo", 200, nil)
+	fake := &fakeRoundTripper{
+		resp: &http.Response{
+			Body:       ioutil.NopCloser(bytes.NewBufferString("foo")),
+			StatusCode: 200,
+		},
+	}
 	validator, err := makeTestValidator(map[string]string{
 		"foo": "foo.com:80",
 		"bar": "bar.com:8080",
@@ -101,7 +122,6 @@ func TestValidator(t *testing.T) {
 	defer testServer.Close()
 
 	resp, err := http.Get(testServer.URL + "/validatez")
-
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
@@ -113,13 +133,15 @@ func TestValidator(t *testing.T) {
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
-	status := []ServerStatus{}
+	var status []ServerStatus
-	err = json.Unmarshal(data, &status)
+	if err := json.Unmarshal(data, &status); err != nil {
-	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
 	components := util.StringSet{}
 	for _, s := range status {
+		if s.Err != "nil" {
+			t.Errorf("Component %v is unhealthy: %v", s.Component, s.Err)
+		}
 		components.Insert(s.Component)
 	}
 	if len(status) != 2 || !components.Has("foo") || !components.Has("bar") {

pkg/client/kubelet.go

@@ -75,9 +75,14 @@ type HTTPKubeletClient struct {
 func NewKubeletClient(config *KubeletConfig) (KubeletClient, error) {
 	transport := http.DefaultTransport
 
-	tlsConfig, err := TLSConfigFor(&Config{
+	cfg := &Config{TLSClientConfig: config.TLSClientConfig}
-		TLSClientConfig: config.TLSClientConfig,
+	if config.EnableHttps {
-	})
+		hasCA := len(config.CAFile) > 0 || len(config.CAData) > 0
+		if !hasCA {
+			cfg.Insecure = true
+		}
+	}
+	tlsConfig, err := TLSConfigFor(cfg)
 	if err != nil {
 		return nil, err
 	}

pkg/master/master.go

@@ -561,7 +561,7 @@ func (m *Master) getServersToValidate(c *Config) map[string]apiserver.Server {
 		glog.Errorf("Failed to list minions: %v", err)
 	}
 	for ix, node := range nodes.Items {
-		serversToValidate[fmt.Sprintf("node-%d", ix)] = apiserver.Server{Addr: node.Name, Port: ports.KubeletPort, Path: "/healthz"}
+		serversToValidate[fmt.Sprintf("node-%d", ix)] = apiserver.Server{Addr: node.Name, Port: ports.KubeletPort, Path: "/healthz", EnableHTTPS: true}
 	}
 	return serversToValidate
 }