Golang Config Examples

Example #1

File: client.go Project: sgallagher/origin

// SetOpenShiftDefaults sets the default settings on the passed
// client configuration
func SetOpenShiftDefaults(config *restclient.Config) error {
	if len(config.UserAgent) == 0 {
		config.UserAgent = DefaultOpenShiftUserAgent()
	}
	if config.GroupVersion == nil {
		// Clients default to the preferred code API version
		groupVersionCopy := latest.Version
		config.GroupVersion = &groupVersionCopy
	}
	if config.APIPath == "" {
		config.APIPath = "/oapi"
	}

	// groupMeta, err := registered.Group(config.GroupVersion.Group)
	// if err != nil {
	// 	return fmt.Errorf("API group %q is not recognized (valid values: %v)", config.GroupVersion.Group, latest.Versions)
	// }
	if config.NegotiatedSerializer == nil {
		config.NegotiatedSerializer = kapi.Codecs
	}

	if config.Codec == nil {
		config.Codec = kapi.Codecs.LegacyCodec(*config.GroupVersion)
		// config.Codec = kapi.Codecs.CodecForVersions(groupMeta.Codec, []unversioned.GroupVersion{*config.GroupVersion}, groupMeta.GroupVersions)
	}
	return nil
}

Example #2

File: client.go Project: CNDonny/scope

// NewClient returns a new client based on the passed in config. The
// codec is ignored, as the dynamic client uses it's own codec.
func NewClient(conf *restclient.Config) (*Client, error) {
	// avoid changing the original config
	confCopy := *conf
	conf = &confCopy

	conf.Codec = dynamicCodec{}

	if conf.APIPath == "" {
		conf.APIPath = "/api"
	}

	if len(conf.UserAgent) == 0 {
		conf.UserAgent = restclient.DefaultKubernetesUserAgent()
	}

	if conf.QPS == 0.0 {
		conf.QPS = 5.0
	}
	if conf.Burst == 0 {
		conf.Burst = 10
	}

	cl, err := restclient.RESTClientFor(conf)
	if err != nil {
		return nil, err
	}

	return &Client{cl: cl}, nil
}

Example #3

File: client.go Project: AdoHe/kubernetes

// NewClient returns a new client based on the passed in config. The
// codec is ignored, as the dynamic client uses it's own codec.
func NewClient(conf *restclient.Config) (*Client, error) {
	// avoid changing the original config
	confCopy := *conf
	conf = &confCopy

	// TODO: it's questionable that this should be using anything other than unstructured schema and JSON
	conf.ContentType = runtime.ContentTypeJSON
	conf.AcceptContentTypes = runtime.ContentTypeJSON

	if conf.APIPath == "" {
		conf.APIPath = "/api"
	}

	if len(conf.UserAgent) == 0 {
		conf.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	if conf.NegotiatedSerializer == nil {
		streamingInfo, _ := api.Codecs.StreamingSerializerForMediaType("application/json;stream=watch", nil)
		conf.NegotiatedSerializer = serializer.NegotiatedSerializerWrapper(runtime.SerializerInfo{Serializer: dynamicCodec{}}, streamingInfo)
	}

	cl, err := restclient.RESTClientFor(conf)
	if err != nil {
		return nil, err
	}

	return &Client{cl: cl}, nil
}

Example #4

File: cluster_util.go Project: kubernetes/kubernetes

func BuildClusterConfig(c *federation_v1beta1.Cluster) (*restclient.Config, error) {
	var serverAddress string
	var clusterConfig *restclient.Config
	hostIP, err := utilnet.ChooseHostInterface()
	if err != nil {
		return nil, err
	}

	for _, item := range c.Spec.ServerAddressByClientCIDRs {
		_, cidrnet, err := net.ParseCIDR(item.ClientCIDR)
		if err != nil {
			return nil, err
		}
		myaddr := net.ParseIP(hostIP.String())
		if cidrnet.Contains(myaddr) == true {
			serverAddress = item.ServerAddress
			break
		}
	}
	if serverAddress != "" {
		if c.Spec.SecretRef == nil {
			glog.Infof("didn't find secretRef for cluster %s. Trying insecure access", c.Name)
			clusterConfig, err = clientcmd.BuildConfigFromFlags(serverAddress, "")
		} else {
			kubeconfigGetter := KubeconfigGetterForCluster(c)
			clusterConfig, err = clientcmd.BuildConfigFromKubeconfigGetter(serverAddress, kubeconfigGetter)
		}
		if err != nil {
			return nil, err
		}
		clusterConfig.QPS = KubeAPIQPS
		clusterConfig.Burst = KubeAPIBurst
	}
	return clusterConfig, nil
}

Example #5

File: client.go Project: poomsujarit/origin

// Clients returns an OpenShift and Kubernetes client with the credentials of the named service account
// TODO: change return types to client.Interface/kclient.Interface to allow auto-reloading credentials
func Clients(config restclient.Config, tokenRetriever TokenRetriever, namespace, name string) (*restclient.Config, *client.Client, *kclient.Client, error) {
	// Clear existing auth info
	config.Username = ""
	config.Password = ""
	config.CertFile = ""
	config.CertData = []byte{}
	config.KeyFile = ""
	config.KeyData = []byte{}
	config.BearerToken = ""

	if len(config.UserAgent) > 0 {
		config.UserAgent += " "
	}
	config.UserAgent += fmt.Sprintf("system:serviceaccount:%s:%s", namespace, name)

	// For now, just initialize the token once
	// TODO: refetch the token if the client encounters 401 errors
	token, err := tokenRetriever.GetToken(namespace, name)
	if err != nil {
		return nil, nil, nil, err
	}
	config.BearerToken = token

	c, err := client.New(&config)
	if err != nil {
		return nil, nil, nil, err
	}

	kc, err := kclient.New(&config)
	if err != nil {
		return nil, nil, nil, err
	}

	return &config, c, kc, nil
}

Example #6

File: authentication.go Project: johscheuer/kubernetes

func (s *DelegatingAuthenticationOptions) newTokenAccessReview() (authenticationclient.TokenReviewInterface, error) {
	var clientConfig *restclient.Config
	var err error
	if len(s.RemoteKubeConfigFile) > 0 {
		loadingRules := &clientcmd.ClientConfigLoadingRules{ExplicitPath: s.RemoteKubeConfigFile}
		loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})

		clientConfig, err = loader.ClientConfig()

	} else {
		// without the remote kubeconfig file, try to use the in-cluster config.  Most addon API servers will
		// use this path
		clientConfig, err = restclient.InClusterConfig()
	}
	if err != nil {
		return nil, err
	}

	// set high qps/burst limits since this will effectively limit API server responsiveness
	clientConfig.QPS = 200
	clientConfig.Burst = 400

	client, err := authenticationclient.NewForConfig(clientConfig)
	if err != nil {
		return nil, err
	}

	return client.TokenReviews(), nil
}

Example #7

File: client.go Project: ncdc/kubernetes

// NewClient returns a new client based on the passed in config. The
// codec is ignored, as the dynamic client uses it's own codec.
func NewClient(conf *restclient.Config) (*Client, error) {
	// avoid changing the original config
	confCopy := *conf
	conf = &confCopy

	contentConfig := ContentConfig()
	contentConfig.GroupVersion = conf.GroupVersion
	if conf.NegotiatedSerializer != nil {
		contentConfig.NegotiatedSerializer = conf.NegotiatedSerializer
	}
	conf.ContentConfig = contentConfig

	if conf.APIPath == "" {
		conf.APIPath = "/api"
	}

	if len(conf.UserAgent) == 0 {
		conf.UserAgent = restclient.DefaultKubernetesUserAgent()
	}

	cl, err := restclient.RESTClientFor(conf)
	if err != nil {
		return nil, err
	}

	return &Client{cl: cl}, nil
}

Example #8

File: client_config.go Project: bryk/kubernetes

// makeUserIdentificationFieldsConfig returns a client.Config capable of being merged using mergo for only server identification information
func makeServerIdentificationConfig(info clientauth.Info) restclient.Config {
	config := restclient.Config{}
	config.CAFile = info.CAFile
	if info.Insecure != nil {
		config.Insecure = *info.Insecure
	}
	return config
}

Example #9

File: helpers.go Project: Xmagicer/origin

// applyClientConnectionOverrides updates a kubeConfig with the overrides from the config.
func applyClientConnectionOverrides(overrides *ClientConnectionOverrides, kubeConfig *restclient.Config) {
	if overrides == nil {
		return
	}
	kubeConfig.QPS = overrides.QPS
	kubeConfig.Burst = int(overrides.Burst)
	kubeConfig.ContentConfig.AcceptContentTypes = overrides.AcceptContentTypes
	kubeConfig.ContentConfig.ContentType = overrides.ContentType
}

Example #10

File: discovery_client.go Project: jojimt/contrib

func setDiscoveryDefaults(config *restclient.Config) error {
	config.APIPath = ""
	config.GroupVersion = nil
	config.Codec = runtime.NoopEncoder{api.Codecs.UniversalDecoder()}
	if len(config.UserAgent) == 0 {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	return nil
}

Example #11

File: discovery_client.go Project: eljefedelrodeodeljefe/kubernetes

func setDiscoveryDefaults(config *restclient.Config) error {
	config.APIPath = ""
	config.GroupVersion = nil
	codec := runtime.NoopEncoder{Decoder: api.Codecs.UniversalDecoder()}
	config.NegotiatedSerializer = serializer.NegotiatedSerializerWrapper(runtime.SerializerInfo{Serializer: codec})
	if len(config.UserAgent) == 0 {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	return nil
}

Example #12

File: certificates.go Project: CodeJuan/kubernetes

func setCertificatesDefaults(config *restclient.Config) error {
	setGroupDefaults(certificates.GroupName, config)
	if config.QPS == 0 {
		config.QPS = 5
	}
	if config.Burst == 0 {
		config.Burst = 10
	}
	return nil
}

Example #13

File: oauth_disabled_test.go Project: Xmagicer/origin

func TestOAuthDisabled(t *testing.T) {
	testutil.RequireEtcd(t)
	defer testutil.DumpEtcdOnFailure(t)
	// Build master config
	masterOptions, err := testserver.DefaultMasterOptions()
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	// Disable OAuth
	masterOptions.OAuthConfig = nil

	// Start server
	clusterAdminKubeConfig, err := testserver.StartConfiguredMaster(masterOptions)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	client, err := testutil.GetClusterAdminKubeClient(clusterAdminKubeConfig)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	clientConfig, err := testutil.GetClusterAdminClientConfig(clusterAdminKubeConfig)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	// Make sure cert auth still works
	namespaces, err := client.Namespaces().List(kapi.ListOptions{})
	if err != nil {
		t.Fatalf("Unexpected error %v", err)
	}
	if len(namespaces.Items) == 0 {
		t.Errorf("Expected namespaces, got none")
	}

	// Use the server and CA info
	anonConfig := restclient.Config{}
	anonConfig.Host = clientConfig.Host
	anonConfig.CAFile = clientConfig.CAFile
	anonConfig.CAData = clientConfig.CAData

	// Make sure we can't authenticate using OAuth
	if _, err := tokencmd.RequestToken(&anonConfig, nil, "username", "password"); err == nil {
		t.Error("Expected error, got none")
	}

}

Example #14

File: rescheduler.go Project: spxtr/contrib

func createKubeClient(flags *flag.FlagSet, inCluster bool) (*kube_client.Client, error) {
	var config *kube_restclient.Config
	var err error
	if inCluster {
		config, err = kube_restclient.InClusterConfig()
	} else {
		clientConfig := kubectl_util.DefaultClientConfig(flags)
		config, err = clientConfig.ClientConfig()
	}
	if err != nil {
		fmt.Errorf("error connecting to the client: %v", err)
	}
	config.ContentType = *contentType
	return kube_client.NewOrDie(config), nil
}

Example #15

File: helper.go Project: Xmagicer/origin

// SetKubernetesDefaults sets default values on the provided client config for accessing the
// Kubernetes API or returns an error if any of the defaults are impossible or invalid.
// TODO: this method needs to be split into one that sets defaults per group, expected to be fix in PR "Refactoring clientcache.go and helper.go #14592"
func SetKubernetesDefaults(config *restclient.Config) error {
	if config.APIPath == "" {
		config.APIPath = legacyAPIPath
	}
	g, err := registered.Group(api.GroupName)
	if err != nil {
		return err
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	if config.NegotiatedSerializer == nil {
		config.NegotiatedSerializer = api.Codecs
	}
	return restclient.SetKubernetesDefaults(config)
}

Example #16

File: client.go Project: php-coder/origin

// SetOpenShiftDefaults sets the default settings on the passed
// client configuration
func SetOpenShiftDefaults(config *restclient.Config) error {
	if len(config.UserAgent) == 0 {
		config.UserAgent = DefaultOpenShiftUserAgent()
	}
	if config.GroupVersion == nil {
		// Clients default to the preferred code API version
		groupVersionCopy := latest.Version
		config.GroupVersion = &groupVersionCopy
	}
	if config.APIPath == "" {
		config.APIPath = "/oapi"
	}
	if config.NegotiatedSerializer == nil {
		config.NegotiatedSerializer = kapi.Codecs
	}
	return nil
}

Example #17

File: helper.go Project: rlugojr/kubernetes

// SetKubernetesDefaults sets default values on the provided client config for accessing the
// Kubernetes API or returns an error if any of the defaults are impossible or invalid.
// TODO: this method needs to be split into one that sets defaults per group, expected to be fix in PR "Refactoring clientcache.go and helper.go #14592"
func SetKubernetesDefaults(config *restclient.Config) error {
	if config.APIPath == "" {
		config.APIPath = legacyAPIPath
	}
	if config.GroupVersion == nil || config.GroupVersion.Group != api.GroupName {
		g, err := registered.Group(api.GroupName)
		if err != nil {
			return err
		}
		copyGroupVersion := g.GroupVersion
		config.GroupVersion = &copyGroupVersion
	}
	if config.NegotiatedSerializer == nil {
		config.NegotiatedSerializer = api.Codecs
	}
	return restclient.SetKubernetesDefaults(config)
}

Example #18

File: client.go Project: RomainVabre/origin

// Clients returns an OpenShift and Kubernetes client with the credentials of the named service account
// TODO: change return types to client.Interface/kclient.Interface to allow auto-reloading credentials
func Clients(config restclient.Config, tokenRetriever TokenRetriever, namespace, name string) (*restclient.Config, *client.Client, *kclient.Client, error) {
	// Clear existing auth info
	config.Username = ""
	config.Password = ""
	config.CertFile = ""
	config.CertData = []byte{}
	config.KeyFile = ""
	config.KeyData = []byte{}
	config.BearerToken = ""

	kubeUserAgent := ""
	openshiftUserAgent := ""

	// they specified, don't mess with it
	if len(config.UserAgent) > 0 {
		kubeUserAgent = config.UserAgent
		openshiftUserAgent = config.UserAgent

	} else {
		kubeUserAgent = fmt.Sprintf("%s system:serviceaccount:%s:%s", restclient.DefaultKubernetesUserAgent(), namespace, name)
		openshiftUserAgent = fmt.Sprintf("%s system:serviceaccount:%s:%s", client.DefaultOpenShiftUserAgent(), namespace, name)
	}

	// For now, just initialize the token once
	// TODO: refetch the token if the client encounters 401 errors
	token, err := tokenRetriever.GetToken(namespace, name)
	if err != nil {
		return nil, nil, nil, err
	}
	config.BearerToken = token

	config.UserAgent = openshiftUserAgent
	c, err := client.New(&config)
	if err != nil {
		return nil, nil, nil, err
	}

	config.UserAgent = kubeUserAgent
	kc, err := kclient.New(&config)
	if err != nil {
		return nil, nil, nil, err
	}

	return &config, c, kc, nil
}

Example #19

File: batch.go Project: Cloven/minikube

func setBatchDefaults(config *restclient.Config, gv *unversioned.GroupVersion) error {
	// if batch group is not registered, return an error
	g, err := registered.Group(batch.GroupName)
	if err != nil {
		return err
	}
	config.APIPath = defaultAPIPath
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	if gv != nil {
		copyGroupVersion = *gv
	}
	config.GroupVersion = &copyGroupVersion
	//}

	config.Codec = api.Codecs.LegacyCodec(*config.GroupVersion)
	config.NegotiatedSerializer = api.Codecs
	if config.QPS == 0 {
		config.QPS = 5
	}
	if config.Burst == 0 {
		config.Burst = 10
	}
	return nil
}

Example #20

File: policy.go Project: Cloven/minikube

func setPolicyDefaults(config *restclient.Config) error {
	g, err := registered.Group(policy.GroupName)
	if err != nil {
		return err
	}
	config.APIPath = defaultAPIPath
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	config.Codec = api.Codecs.LegacyCodec(*config.GroupVersion)
	config.NegotiatedSerializer = api.Codecs
	if config.QPS == 0 {
		config.QPS = 5
	}
	if config.Burst == 0 {
		config.Burst = 10
	}
	return nil
}

Example #21

File: helper.go Project: rlugojr/kubernetes

func setGroupDefaults(groupName string, config *restclient.Config) error {
	config.APIPath = defaultAPIPath
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	if config.GroupVersion == nil || config.GroupVersion.Group != groupName {
		g, err := registered.Group(groupName)
		if err != nil {
			return err
		}
		copyGroupVersion := g.GroupVersion
		config.GroupVersion = &copyGroupVersion
	}
	if config.NegotiatedSerializer == nil {
		config.NegotiatedSerializer = api.Codecs
	}
	return nil
}

Example #22

File: apps.go Project: RyanBinfeng/kubernetes

func setAppsDefaults(config *restclient.Config) error {
	g, err := registered.Group(apps.GroupName)
	if err != nil {
		return err
	}
	config.APIPath = defaultAPIPath
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	config.NegotiatedSerializer = api.Codecs
	return nil
}

Example #23

File: server.go Project: feiskyer/kubernetes

// addChaosToClientConfig injects random errors into client connections if configured.
func addChaosToClientConfig(s *options.KubeletServer, config *restclient.Config) {
	if s.ChaosChance != 0.0 {
		config.WrapTransport = func(rt http.RoundTripper) http.RoundTripper {
			seed := chaosclient.NewSeed(1)
			// TODO: introduce a standard chaos package with more tunables - this is just a proof of concept
			// TODO: introduce random latency and stalls
			return chaosclient.NewChaosRoundTripper(rt, chaosclient.LogChaos, seed.P(s.ChaosChance, chaosclient.ErrSimulatedConnectionResetByPeer))
		}
	}
}

Example #24

File: policy_client.go Project: nak3/kubernetes

func setConfigDefaults(config *restclient.Config) error {
	gv, err := schema.ParseGroupVersion("policy/v1beta1")
	if err != nil {
		return err
	}
	// if policy/v1beta1 is not enabled, return an error
	if !registered.IsEnabledVersion(gv) {
		return fmt.Errorf("policy/v1beta1 is not enabled")
	}
	config.APIPath = "/apis"
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	copyGroupVersion := gv
	config.GroupVersion = &copyGroupVersion

	config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: api.Codecs}

	return nil
}

Example #25

File: extensions.go Project: XbinZh/kubernetes

func setExtensionsDefaults(config *restclient.Config) error {
	// if experimental group is not registered, return an error
	g, err := registered.Group(extensions.GroupName)
	if err != nil {
		return err
	}
	config.APIPath = defaultAPIPath
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	config.Codec = api.Codecs.LegacyCodec(*config.GroupVersion)
	config.NegotiatedSerializer = api.Codecs
	return nil
}

Example #26

File: clientauth.go Project: CodeJuan/kubernetes

// MergeWithConfig returns a copy of a client.Config with values from the Info.
// The fields of client.Config with a corresponding field in the Info are set
// with the value from the Info.
func (info Info) MergeWithConfig(c restclient.Config) (restclient.Config, error) {
	var config restclient.Config = c
	config.Username = info.User
	config.Password = info.Password
	config.CAFile = info.CAFile
	config.CertFile = info.CertFile
	config.KeyFile = info.KeyFile
	config.BearerToken = info.BearerToken
	if info.Insecure != nil {
		config.Insecure = *info.Insecure
	}
	return config, nil
}

Example #27

func setConfigDefaults(config *restclient.Config) error {
	// if extensions group is not registered, return an error
	g, err := registered.Group("extensions")
	if err != nil {
		return err
	}
	config.APIPath = "/apis"
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: api.Codecs}

	return nil
}

Example #28

File: extensions_client.go Project: Clarifai/kubernetes

func setConfigDefaults(config *restclient.Config) error {
	// if extensions group is not registered, return an error
	g, err := registered.Group("extensions")
	if err != nil {
		return err
	}
	config.APIPath = "/apis"
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	codec, ok := api.Codecs.SerializerForFileExtension("json")
	if !ok {
		return fmt.Errorf("unable to find serializer for JSON")
	}
	config.Codec = codec

	if config.QPS == 0 {
		config.QPS = 5
	}
	if config.Burst == 0 {
		config.Burst = 10
	}
	return nil
}

Example #29

File: testgroup_client.go Project: Clarifai/kubernetes

func setConfigDefaults(config *restclient.Config) error {
	// if testgroup group is not registered, return an error
	g, err := registered.Group("testgroup.k8s.io")
	if err != nil {
		return err
	}
	config.APIPath = "/apis"
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	config.Codec = api.Codecs.LegacyCodec(*config.GroupVersion)
	if config.QPS == 0 {
		config.QPS = 5
	}
	if config.Burst == 0 {
		config.Burst = 10
	}
	return nil
}

Example #30

File: core_client.go Project: Xmagicer/origin

func setConfigDefaults(config *restclient.Config) error {
	// if core group is not registered, return an error
	g, err := registered.Group("")
	if err != nil {
		return err
	}
	config.APIPath = "/api"
	if config.UserAgent == "" {
		config.UserAgent = restclient.DefaultKubernetesUserAgent()
	}
	// TODO: Unconditionally set the config.Version, until we fix the config.
	//if config.Version == "" {
	copyGroupVersion := g.GroupVersion
	config.GroupVersion = &copyGroupVersion
	//}

	config.NegotiatedSerializer = api.Codecs

	if config.QPS == 0 {
		config.QPS = 5
	}
	if config.Burst == 0 {
		config.Burst = 10
	}
	return nil
}