Exemplo n.º 1
0
// TestValidOpenAPISpec verifies that the open api is added
// at the proper endpoint and the spec is valid.
func TestValidOpenAPISpec(t *testing.T) {
	_, etcdserver, config, assert := setUp(t)
	defer etcdserver.Terminate(t)

	config.GenericConfig.EnableIndex = true
	config.GenericConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(openapigen.OpenAPIDefinitions)
	config.GenericConfig.OpenAPIConfig.Info = &spec.Info{
		InfoProps: spec.InfoProps{
			Title:   "Kubernetes",
			Version: "unversioned",
		},
	}
	config.GenericConfig.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()

	master, err := config.Complete().New()
	if err != nil {
		t.Fatalf("Error in bringing up the master: %v", err)
	}

	// make sure swagger.json is not registered before calling PrepareRun.
	server := httptest.NewServer(master.GenericAPIServer.HandlerContainer.ServeMux)
	defer server.Close()
	resp, err := http.Get(server.URL + "/swagger.json")
	if !assert.NoError(err) {
		t.Errorf("unexpected error: %v", err)
	}
	assert.Equal(http.StatusNotFound, resp.StatusCode)

	master.GenericAPIServer.PrepareRun()

	resp, err = http.Get(server.URL + "/swagger.json")
	if !assert.NoError(err) {
		t.Errorf("unexpected error: %v", err)
	}
	assert.Equal(http.StatusOK, resp.StatusCode)

	// as json schema
	var sch spec.Schema
	if assert.NoError(decodeResponse(resp, &sch)) {
		validator := validate.NewSchemaValidator(spec.MustLoadSwagger20Schema(), nil, "", strfmt.Default)
		res := validator.Validate(&sch)
		assert.NoError(res.AsError())
	}

	// Validate OpenApi spec
	doc, err := loads.Spec(server.URL + "/swagger.json")
	if assert.NoError(err) {
		validator := validate.NewSpecValidator(doc.Schema(), strfmt.Default)
		res, warns := validator.Validate(doc)
		assert.NoError(res.AsError())
		if !warns.IsValid() {
			t.Logf("Open API spec on root has some warnings : %v", warns)
		}
	}
}
Exemplo n.º 2
0
// Run runs the specified APIServer.  This should never exit.
func Run(s *options.ServerRunOptions) error {
	// set defaults
	if err := s.GenericServerRunOptions.DefaultAdvertiseAddress(s.SecureServing, s.InsecureServing); err != nil {
		return err
	}
	serviceIPRange, apiServerServiceIP, err := master.DefaultServiceIPRange(s.ServiceClusterIPRange)
	if err != nil {
		return fmt.Errorf("error determining service IP ranges: %v", err)
	}
	if err := s.SecureServing.MaybeDefaultWithSelfSignedCerts(s.GenericServerRunOptions.AdvertiseAddress.String(), apiServerServiceIP); err != nil {
		return fmt.Errorf("error creating self-signed certificates: %v", err)
	}
	if err := s.CloudProvider.DefaultExternalHost(s.GenericServerRunOptions); err != nil {
		return fmt.Errorf("error setting the external host value: %v", err)
	}

	s.Authentication.ApplyAuthorization(s.Authorization)

	// validate options
	if errs := s.Validate(); len(errs) != 0 {
		return utilerrors.NewAggregate(errs)
	}

	// create config from options
	genericConfig := genericapiserver.NewConfig().
		ApplyOptions(s.GenericServerRunOptions).
		ApplyInsecureServingOptions(s.InsecureServing)

	if _, err := genericConfig.ApplySecureServingOptions(s.SecureServing); err != nil {
		return fmt.Errorf("failed to configure https: %s", err)
	}
	if err = s.Authentication.Apply(genericConfig); err != nil {
		return fmt.Errorf("failed to configure authentication: %s", err)
	}

	capabilities.Initialize(capabilities.Capabilities{
		AllowPrivileged: s.AllowPrivileged,
		// TODO(vmarmol): Implement support for HostNetworkSources.
		PrivilegedSources: capabilities.PrivilegedSources{
			HostNetworkSources: []string{},
			HostPIDSources:     []string{},
			HostIPCSources:     []string{},
		},
		PerConnectionBandwidthLimitBytesPerSec: s.MaxConnectionBytesPerSec,
	})

	// Setup nodeTunneler if needed
	var nodeTunneler tunneler.Tunneler
	var proxyDialerFn utilnet.DialFunc
	if len(s.SSHUser) > 0 {
		// Get ssh key distribution func, if supported
		var installSSHKey tunneler.InstallSSHKey
		cloud, err := cloudprovider.InitCloudProvider(s.CloudProvider.CloudProvider, s.CloudProvider.CloudConfigFile)
		if err != nil {
			return fmt.Errorf("cloud provider could not be initialized: %v", err)
		}
		if cloud != nil {
			if instances, supported := cloud.Instances(); supported {
				installSSHKey = instances.AddSSHKeyToAllInstances
			}
		}
		if s.KubeletConfig.Port == 0 {
			return fmt.Errorf("must enable kubelet port if proxy ssh-tunneling is specified")
		}
		if s.KubeletConfig.ReadOnlyPort == 0 {
			return fmt.Errorf("must enable kubelet readonly port if proxy ssh-tunneling is specified")
		}
		// Set up the nodeTunneler
		// TODO(cjcullen): If we want this to handle per-kubelet ports or other
		// kubelet listen-addresses, we need to plumb through options.
		healthCheckPath := &url.URL{
			Scheme: "http",
			Host:   net.JoinHostPort("127.0.0.1", strconv.FormatUint(uint64(s.KubeletConfig.ReadOnlyPort), 10)),
			Path:   "healthz",
		}
		nodeTunneler = tunneler.New(s.SSHUser, s.SSHKeyfile, healthCheckPath, installSSHKey)

		// Use the nodeTunneler's dialer to connect to the kubelet
		s.KubeletConfig.Dial = nodeTunneler.Dial
		// Use the nodeTunneler's dialer when proxying to pods, services, and nodes
		proxyDialerFn = nodeTunneler.Dial
	}

	// Proxying to pods and services is IP-based... don't expect to be able to verify the hostname
	proxyTLSClientConfig := &tls.Config{InsecureSkipVerify: true}

	if s.Etcd.StorageConfig.DeserializationCacheSize == 0 {
		// When size of cache is not explicitly set, estimate its size based on
		// target memory usage.
		glog.V(2).Infof("Initializing deserialization cache size based on %dMB limit", s.GenericServerRunOptions.TargetRAMMB)

		// This is the heuristics that from memory capacity is trying to infer
		// the maximum number of nodes in the cluster and set cache sizes based
		// on that value.
		// From our documentation, we officially recomment 120GB machines for
		// 2000 nodes, and we scale from that point. Thus we assume ~60MB of
		// capacity per node.
		// TODO: We may consider deciding that some percentage of memory will
		// be used for the deserialization cache and divide it by the max object
		// size to compute its size. We may even go further and measure
		// collective sizes of the objects in the cache.
		clusterSize := s.GenericServerRunOptions.TargetRAMMB / 60
		s.Etcd.StorageConfig.DeserializationCacheSize = 25 * clusterSize
		if s.Etcd.StorageConfig.DeserializationCacheSize < 1000 {
			s.Etcd.StorageConfig.DeserializationCacheSize = 1000
		}
	}

	storageGroupsToEncodingVersion, err := s.GenericServerRunOptions.StorageGroupsToEncodingVersion()
	if err != nil {
		return fmt.Errorf("error generating storage version map: %s", err)
	}
	storageFactory, err := kubeapiserver.BuildDefaultStorageFactory(
		s.Etcd.StorageConfig, s.GenericServerRunOptions.DefaultStorageMediaType, api.Codecs,
		genericapiserver.NewDefaultResourceEncodingConfig(), storageGroupsToEncodingVersion,
		// FIXME: this GroupVersionResource override should be configurable
		[]schema.GroupVersionResource{batch.Resource("cronjobs").WithVersion("v2alpha1")},
		master.DefaultAPIResourceConfigSource(), s.GenericServerRunOptions.RuntimeConfig)
	if err != nil {
		return fmt.Errorf("error in initializing storage factory: %s", err)
	}
	storageFactory.AddCohabitatingResources(autoscaling.Resource("horizontalpodautoscalers"), extensions.Resource("horizontalpodautoscalers"))
	for _, override := range s.Etcd.EtcdServersOverrides {
		tokens := strings.Split(override, "#")
		if len(tokens) != 2 {
			glog.Errorf("invalid value of etcd server overrides: %s", override)
			continue
		}

		apiresource := strings.Split(tokens[0], "/")
		if len(apiresource) != 2 {
			glog.Errorf("invalid resource definition: %s", tokens[0])
			continue
		}
		group := apiresource[0]
		resource := apiresource[1]
		groupResource := schema.GroupResource{Group: group, Resource: resource}

		servers := strings.Split(tokens[1], ";")
		storageFactory.SetEtcdLocation(groupResource, servers)
	}

	// Default to the private server key for service account token signing
	if len(s.Authentication.ServiceAccounts.KeyFiles) == 0 && s.SecureServing.ServerCert.CertKey.KeyFile != "" {
		if kubeauthenticator.IsValidServiceAccountKeyFile(s.SecureServing.ServerCert.CertKey.KeyFile) {
			s.Authentication.ServiceAccounts.KeyFiles = []string{s.SecureServing.ServerCert.CertKey.KeyFile}
		} else {
			glog.Warning("No TLS key provided, service account token authentication disabled")
		}
	}

	authenticatorConfig := s.Authentication.ToAuthenticationConfig()
	if s.Authentication.ServiceAccounts.Lookup {
		// If we need to look up service accounts and tokens,
		// go directly to etcd to avoid recursive auth insanity
		storageConfig, err := storageFactory.NewConfig(api.Resource("serviceaccounts"))
		if err != nil {
			return fmt.Errorf("unable to get serviceaccounts storage: %v", err)
		}
		authenticatorConfig.ServiceAccountTokenGetter = serviceaccountcontroller.NewGetterFromStorageInterface(storageConfig, storageFactory.ResourcePrefix(api.Resource("serviceaccounts")), storageFactory.ResourcePrefix(api.Resource("secrets")))
	}

	apiAuthenticator, securityDefinitions, err := authenticatorConfig.New()
	if err != nil {
		return fmt.Errorf("invalid Authentication Config: %v", err)
	}

	privilegedLoopbackToken := uuid.NewRandom().String()
	selfClientConfig, err := genericapiserver.NewSelfClientConfig(genericConfig.SecureServingInfo, genericConfig.InsecureServingInfo, privilegedLoopbackToken)
	if err != nil {
		return fmt.Errorf("failed to create clientset: %v", err)
	}
	client, err := internalclientset.NewForConfig(selfClientConfig)
	if err != nil {
		kubeAPIVersions := os.Getenv("KUBE_API_VERSIONS")
		if len(kubeAPIVersions) == 0 {
			return fmt.Errorf("failed to create clientset: %v", err)
		}

		// KUBE_API_VERSIONS is used in test-update-storage-objects.sh, disabling a number of API
		// groups. This leads to a nil client above and undefined behaviour further down.
		// TODO: get rid of KUBE_API_VERSIONS or define sane behaviour if set
		glog.Errorf("Failed to create clientset with KUBE_API_VERSIONS=%q. KUBE_API_VERSIONS is only for testing. Things will break.", kubeAPIVersions)
	}
	sharedInformers := informers.NewSharedInformerFactory(nil, client, 10*time.Minute)

	authorizationConfig := s.Authorization.ToAuthorizationConfig(sharedInformers)
	apiAuthorizer, err := authorizationConfig.New()
	if err != nil {
		return fmt.Errorf("invalid Authorization Config: %v", err)
	}

	admissionControlPluginNames := strings.Split(s.GenericServerRunOptions.AdmissionControl, ",")
	pluginInitializer := kubeadmission.NewPluginInitializer(client, sharedInformers, apiAuthorizer)
	admissionConfigProvider, err := kubeadmission.ReadAdmissionConfiguration(admissionControlPluginNames, s.GenericServerRunOptions.AdmissionControlConfigFile)
	if err != nil {
		return fmt.Errorf("failed to read plugin config: %v", err)
	}
	admissionController, err := admission.NewFromPlugins(admissionControlPluginNames, admissionConfigProvider, pluginInitializer)
	if err != nil {
		return fmt.Errorf("failed to initialize plugins: %v", err)
	}

	proxyTransport := utilnet.SetTransportDefaults(&http.Transport{
		Dial:            proxyDialerFn,
		TLSClientConfig: proxyTLSClientConfig,
	})
	kubeVersion := version.Get()

	genericConfig.Version = &kubeVersion
	genericConfig.LoopbackClientConfig = selfClientConfig
	genericConfig.Authenticator = apiAuthenticator
	genericConfig.Authorizer = apiAuthorizer
	genericConfig.AdmissionControl = admissionController
	genericConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(generatedopenapi.OpenAPIDefinitions)
	genericConfig.OpenAPIConfig.SecurityDefinitions = securityDefinitions
	genericConfig.OpenAPIConfig.Info.Title = "Kubernetes"
	genericConfig.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()
	genericConfig.EnableMetrics = true
	genericConfig.LongRunningFunc = filters.BasicLongRunningRequestCheck(
		sets.NewString("watch", "proxy"),
		sets.NewString("attach", "exec", "proxy", "log", "portforward"),
	)

	config := &master.Config{
		GenericConfig: genericConfig,

		APIResourceConfigSource: storageFactory.APIResourceConfigSource,
		StorageFactory:          storageFactory,
		EnableWatchCache:        s.GenericServerRunOptions.EnableWatchCache,
		EnableCoreControllers:   true,
		DeleteCollectionWorkers: s.GenericServerRunOptions.DeleteCollectionWorkers,
		EventTTL:                s.EventTTL,
		KubeletClientConfig:     s.KubeletConfig,
		EnableUISupport:         true,
		EnableLogsSupport:       true,
		ProxyTransport:          proxyTransport,

		Tunneler: nodeTunneler,

		ServiceIPRange:       serviceIPRange,
		APIServerServiceIP:   apiServerServiceIP,
		APIServerServicePort: 443,

		ServiceNodePortRange:      s.ServiceNodePortRange,
		KubernetesServiceNodePort: s.KubernetesServiceNodePort,

		MasterCount: s.MasterCount,
	}

	if s.GenericServerRunOptions.EnableWatchCache {
		glog.V(2).Infof("Initializing cache sizes based on %dMB limit", s.GenericServerRunOptions.TargetRAMMB)
		cachesize.InitializeWatchCacheSizes(s.GenericServerRunOptions.TargetRAMMB)
		cachesize.SetWatchCacheSizes(s.GenericServerRunOptions.WatchCacheSizes)
	}

	m, err := config.Complete().New()
	if err != nil {
		return err
	}

	sharedInformers.Start(wait.NeverStop)
	m.GenericAPIServer.PrepareRun().Run(wait.NeverStop)
	return nil
}
Exemplo n.º 3
0
func (serverOptions *ServerRunOptions) Run(stopCh <-chan struct{}) error {
	serverOptions.Etcd.StorageConfig.ServerList = []string{"http://127.0.0.1:2379"}

	// set defaults
	if err := serverOptions.CloudProvider.DefaultExternalHost(serverOptions.GenericServerRunOptions); err != nil {
		return err
	}
	if err := serverOptions.SecureServing.MaybeDefaultWithSelfSignedCerts(serverOptions.GenericServerRunOptions.AdvertiseAddress.String()); err != nil {
		glog.Fatalf("Error creating self-signed certificates: %v", err)
	}

	// validate options
	if errs := serverOptions.Etcd.Validate(); len(errs) > 0 {
		return utilerrors.NewAggregate(errs)
	}
	if errs := serverOptions.SecureServing.Validate(); len(errs) > 0 {
		return utilerrors.NewAggregate(errs)
	}
	if errs := serverOptions.InsecureServing.Validate("insecure-port"); len(errs) > 0 {
		return utilerrors.NewAggregate(errs)
	}

	// create config from options
	config := genericapiserver.NewConfig().
		ApplyOptions(serverOptions.GenericServerRunOptions).
		ApplyInsecureServingOptions(serverOptions.InsecureServing)

	if _, err := config.ApplySecureServingOptions(serverOptions.SecureServing); err != nil {
		return fmt.Errorf("failed to configure https: %s", err)
	}
	if err := serverOptions.Authentication.Apply(config); err != nil {
		return fmt.Errorf("failed to configure authentication: %s", err)
	}

	config.Authorizer = authorizer.NewAlwaysAllowAuthorizer()
	config.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()

	s, err := config.Complete().New()
	if err != nil {
		return fmt.Errorf("Error in bringing up the server: %v", err)
	}

	groupVersion := v1.SchemeGroupVersion
	groupName := groupVersion.Group
	groupMeta, err := api.Registry.Group(groupName)
	if err != nil {
		return fmt.Errorf("%v", err)
	}
	storageFactory := newStorageFactory()
	storageConfig, err := storageFactory.NewConfig(schema.GroupResource{Group: groupName, Resource: "testtype"})
	if err != nil {
		return fmt.Errorf("Unable to get storage config: %v", err)
	}

	testTypeOpts := generic.RESTOptions{
		StorageConfig:           storageConfig,
		Decorator:               generic.UndecoratedStorage,
		ResourcePrefix:          "testtypes",
		DeleteCollectionWorkers: 1,
	}

	restStorageMap := map[string]rest.Storage{
		"testtypes": testgroupetcd.NewREST(testTypeOpts),
	}
	apiGroupInfo := genericapiserver.APIGroupInfo{
		GroupMeta: *groupMeta,
		VersionedResourcesStorageMap: map[string]map[string]rest.Storage{
			groupVersion.Version: restStorageMap,
		},
		Scheme:               api.Scheme,
		NegotiatedSerializer: api.Codecs,
	}
	if err := s.InstallAPIGroup(&apiGroupInfo); err != nil {
		return fmt.Errorf("Error in installing API: %v", err)
	}
	s.PrepareRun().Run(stopCh)
	return nil
}
Exemplo n.º 4
0
// startMasterOrDie starts a kubernetes master and an httpserver to handle api requests
func startMasterOrDie(masterConfig *master.Config, incomingServer *httptest.Server, masterReceiver MasterReceiver) (*master.Master, *httptest.Server) {
	var m *master.Master
	var s *httptest.Server

	if incomingServer != nil {
		s = incomingServer
	} else {
		s = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
			m.GenericAPIServer.Handler.ServeHTTP(w, req)
		}))
	}

	if masterConfig == nil {
		masterConfig = NewMasterConfig()
		masterConfig.GenericConfig.EnableProfiling = true
		masterConfig.GenericConfig.EnableMetrics = true
		masterConfig.GenericConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(openapi.OpenAPIDefinitions)
		masterConfig.GenericConfig.OpenAPIConfig.Info = &spec.Info{
			InfoProps: spec.InfoProps{
				Title:   "Kubernetes",
				Version: "unversioned",
			},
		}
		masterConfig.GenericConfig.OpenAPIConfig.DefaultResponse = &spec.Response{
			ResponseProps: spec.ResponseProps{
				Description: "Default Response.",
			},
		}
		masterConfig.GenericConfig.OpenAPIConfig.Definitions = openapi.OpenAPIDefinitions
		masterConfig.GenericConfig.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()
	}

	// set the loopback client config
	if masterConfig.GenericConfig.LoopbackClientConfig == nil {
		masterConfig.GenericConfig.LoopbackClientConfig = &restclient.Config{QPS: 50, Burst: 100, ContentConfig: restclient.ContentConfig{NegotiatedSerializer: api.Codecs}}
	}
	masterConfig.GenericConfig.LoopbackClientConfig.Host = s.URL

	privilegedLoopbackToken := uuid.NewRandom().String()
	// wrap any available authorizer
	tokens := make(map[string]*user.DefaultInfo)
	tokens[privilegedLoopbackToken] = &user.DefaultInfo{
		Name:   user.APIServerUser,
		UID:    uuid.NewRandom().String(),
		Groups: []string{user.SystemPrivilegedGroup},
	}

	tokenAuthenticator := authenticator.NewAuthenticatorFromTokens(tokens)
	if masterConfig.GenericConfig.Authenticator == nil {
		masterConfig.GenericConfig.Authenticator = authenticatorunion.New(tokenAuthenticator, authauthenticator.RequestFunc(alwaysEmpty))
	} else {
		masterConfig.GenericConfig.Authenticator = authenticatorunion.New(tokenAuthenticator, masterConfig.GenericConfig.Authenticator)
	}

	if masterConfig.GenericConfig.Authorizer != nil {
		tokenAuthorizer := authorizer.NewPrivilegedGroups(user.SystemPrivilegedGroup)
		masterConfig.GenericConfig.Authorizer = authorizerunion.New(tokenAuthorizer, masterConfig.GenericConfig.Authorizer)
	} else {
		masterConfig.GenericConfig.Authorizer = alwaysAllow{}
	}

	masterConfig.GenericConfig.LoopbackClientConfig.BearerToken = privilegedLoopbackToken

	m, err := masterConfig.Complete().New()
	if err != nil {
		glog.Fatalf("error in bringing up the master: %v", err)
	}
	if masterReceiver != nil {
		masterReceiver.SetMaster(m)
	}

	// TODO have this start method actually use the normal start sequence for the API server
	// this method never actually calls the `Run` method for the API server
	// fire the post hooks ourselves
	m.GenericAPIServer.PrepareRun()
	m.GenericAPIServer.RunPostStartHooks()

	cfg := *masterConfig.GenericConfig.LoopbackClientConfig
	cfg.ContentConfig.GroupVersion = &schema.GroupVersion{}
	privilegedClient, err := restclient.RESTClientFor(&cfg)
	if err != nil {
		glog.Fatal(err)
	}
	err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
		result := privilegedClient.Get().AbsPath("/healthz").Do()
		status := 0
		result.StatusCode(&status)
		if status == 200 {
			return true, nil
		}
		return false, nil
	})
	if err != nil {
		glog.Fatal(err)
	}

	// wait for services to be ready
	if masterConfig.EnableCoreControllers {
		// TODO Once /healthz is updated for posthooks, we'll wait for good health
		coreClient := coreclient.NewForConfigOrDie(&cfg)
		svcWatch, err := coreClient.Services(v1.NamespaceDefault).Watch(v1.ListOptions{})
		if err != nil {
			glog.Fatal(err)
		}
		_, err = watch.Until(30*time.Second, svcWatch, func(event watch.Event) (bool, error) {
			if event.Type != watch.Added {
				return false, nil
			}
			if event.Object.(*v1.Service).Name == "kubernetes" {
				return true, nil
			}
			return false, nil
		})
		if err != nil {
			glog.Fatal(err)
		}
	}

	return m, s
}
Exemplo n.º 5
0
// Run runs the specified APIServer.  This should never exit.
func Run(s *options.ServerRunOptions) error {
	// set defaults
	if err := s.GenericServerRunOptions.DefaultAdvertiseAddress(s.SecureServing, s.InsecureServing); err != nil {
		return err
	}
	if err := s.SecureServing.MaybeDefaultWithSelfSignedCerts(s.GenericServerRunOptions.AdvertiseAddress.String()); err != nil {
		return fmt.Errorf("error creating self-signed certificates: %v", err)
	}
	if err := s.CloudProvider.DefaultExternalHost(s.GenericServerRunOptions); err != nil {
		return fmt.Errorf("error setting the external host value: %v", err)
	}

	s.Authentication.ApplyAuthorization(s.Authorization)

	// validate options
	if errs := s.Validate(); len(errs) != 0 {
		return utilerrors.NewAggregate(errs)
	}

	genericConfig := genericapiserver.NewConfig(). // create the new config
							ApplyOptions(s.GenericServerRunOptions). // apply the options selected
							ApplyInsecureServingOptions(s.InsecureServing)

	if _, err := genericConfig.ApplySecureServingOptions(s.SecureServing); err != nil {
		return fmt.Errorf("failed to configure https: %s", err)
	}
	if err := s.Authentication.Apply(genericConfig); err != nil {
		return fmt.Errorf("failed to configure authentication: %s", err)
	}

	// TODO: register cluster federation resources here.
	resourceConfig := genericapiserver.NewResourceConfig()

	if s.Etcd.StorageConfig.DeserializationCacheSize == 0 {
		// When size of cache is not explicitly set, set it to 50000
		s.Etcd.StorageConfig.DeserializationCacheSize = 50000
	}
	storageGroupsToEncodingVersion, err := s.GenericServerRunOptions.StorageGroupsToEncodingVersion()
	if err != nil {
		return fmt.Errorf("error generating storage version map: %s", err)
	}
	storageFactory, err := kubeapiserver.BuildDefaultStorageFactory(
		s.Etcd.StorageConfig, s.GenericServerRunOptions.DefaultStorageMediaType, api.Codecs,
		genericapiserver.NewDefaultResourceEncodingConfig(), storageGroupsToEncodingVersion,
		[]schema.GroupVersionResource{}, resourceConfig, s.GenericServerRunOptions.RuntimeConfig)
	if err != nil {
		return fmt.Errorf("error in initializing storage factory: %s", err)
	}

	for _, override := range s.Etcd.EtcdServersOverrides {
		tokens := strings.Split(override, "#")
		if len(tokens) != 2 {
			glog.Errorf("invalid value of etcd server overrides: %s", override)
			continue
		}

		apiresource := strings.Split(tokens[0], "/")
		if len(apiresource) != 2 {
			glog.Errorf("invalid resource definition: %s", tokens[0])
			continue
		}
		group := apiresource[0]
		resource := apiresource[1]
		groupResource := schema.GroupResource{Group: group, Resource: resource}

		servers := strings.Split(tokens[1], ";")
		storageFactory.SetEtcdLocation(groupResource, servers)
	}

	apiAuthenticator, securityDefinitions, err := s.Authentication.ToAuthenticationConfig().New()
	if err != nil {
		return fmt.Errorf("invalid Authentication Config: %v", err)
	}

	privilegedLoopbackToken := uuid.NewRandom().String()
	selfClientConfig, err := genericapiserver.NewSelfClientConfig(genericConfig.SecureServingInfo, genericConfig.InsecureServingInfo, privilegedLoopbackToken)
	if err != nil {
		return fmt.Errorf("failed to create clientset: %v", err)
	}
	client, err := internalclientset.NewForConfig(selfClientConfig)
	if err != nil {
		return fmt.Errorf("failed to create clientset: %v", err)
	}
	sharedInformers := informers.NewSharedInformerFactory(nil, client, 10*time.Minute)

	authorizationConfig := s.Authorization.ToAuthorizationConfig(sharedInformers)
	apiAuthorizer, err := authorizationConfig.New()
	if err != nil {
		return fmt.Errorf("invalid Authorization Config: %v", err)
	}

	admissionControlPluginNames := strings.Split(s.GenericServerRunOptions.AdmissionControl, ",")
	pluginInitializer := kubeapiserveradmission.NewPluginInitializer(client, sharedInformers, apiAuthorizer)
	admissionConfigProvider, err := kubeapiserveradmission.ReadAdmissionConfiguration(admissionControlPluginNames, s.GenericServerRunOptions.AdmissionControlConfigFile)
	if err != nil {
		return fmt.Errorf("failed to read plugin config: %v", err)
	}
	admissionController, err := admission.NewFromPlugins(admissionControlPluginNames, admissionConfigProvider, pluginInitializer)
	if err != nil {
		return fmt.Errorf("failed to initialize plugins: %v", err)
	}

	kubeVersion := version.Get()
	genericConfig.Version = &kubeVersion
	genericConfig.LoopbackClientConfig = selfClientConfig
	genericConfig.Authenticator = apiAuthenticator
	genericConfig.Authorizer = apiAuthorizer
	genericConfig.AdmissionControl = admissionController
	genericConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(openapi.OpenAPIDefinitions)
	genericConfig.OpenAPIConfig.SecurityDefinitions = securityDefinitions
	genericConfig.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()
	genericConfig.LongRunningFunc = filters.BasicLongRunningRequestCheck(
		sets.NewString("watch", "proxy"),
		sets.NewString("attach", "exec", "proxy", "log", "portforward"),
	)

	// TODO: Move this to generic api server (Need to move the command line flag).
	if s.GenericServerRunOptions.EnableWatchCache {
		cachesize.InitializeWatchCacheSizes(s.GenericServerRunOptions.TargetRAMMB)
		cachesize.SetWatchCacheSizes(s.GenericServerRunOptions.WatchCacheSizes)
	}

	m, err := genericConfig.Complete().New()
	if err != nil {
		return err
	}

	routes.UIRedirect{}.Install(m.HandlerContainer)
	routes.Logs{}.Install(m.HandlerContainer)

	// TODO: Refactor this code to share it with kube-apiserver rather than duplicating it here.
	restOptionsFactory := &restOptionsFactory{
		storageFactory:          storageFactory,
		enableGarbageCollection: s.GenericServerRunOptions.EnableGarbageCollection,
		deleteCollectionWorkers: s.GenericServerRunOptions.DeleteCollectionWorkers,
	}
	if s.GenericServerRunOptions.EnableWatchCache {
		restOptionsFactory.storageDecorator = genericregistry.StorageWithCacher
	} else {
		restOptionsFactory.storageDecorator = generic.UndecoratedStorage
	}

	installFederationAPIs(m, restOptionsFactory)
	installCoreAPIs(s, m, restOptionsFactory)
	installExtensionsAPIs(m, restOptionsFactory)
	installBatchAPIs(m, restOptionsFactory)

	sharedInformers.Start(wait.NeverStop)
	m.PrepareRun().Run(wait.NeverStop)
	return nil
}