Exemplo n.º 1
0
// RunDNSServer starts the DNS server
func (c *MasterConfig) RunDNSServer() {
	config, err := dns.NewServerDefaults()
	if err != nil {
		glog.Fatalf("Could not start DNS: %v", err)
	}
	config.DnsAddr = c.Options.DNSConfig.BindAddress
	config.NoRec = true // do not want to deploy an open resolver

	_, port, err := net.SplitHostPort(c.Options.DNSConfig.BindAddress)
	if err != nil {
		glog.Fatalf("Could not start DNS: %v", err)
	}
	if port != "53" {
		glog.Warningf("Binding DNS on port %v instead of 53 (you may need to run as root and update your config), using %s which will not resolve from all locations", port, c.Options.DNSConfig.BindAddress)
	}

	if ok, err := cmdutil.TryListen(c.Options.DNSConfig.BindAddress); !ok {
		glog.Warningf("Could not start DNS: %v", err)
		return
	}

	go func() {
		err := dns.ListenAndServe(config, c.DNSServerClient(), c.EtcdHelper.Client.(*etcdclient.Client))
		glog.Fatalf("Could not start DNS: %v", err)
	}()

	cmdutil.WaitForSuccessfulDial(false, "tcp", c.Options.DNSConfig.BindAddress, 100*time.Millisecond, 100*time.Millisecond, 100)

	glog.Infof("DNS listening at %s", c.Options.DNSConfig.BindAddress)
}
Exemplo n.º 2
0
// RunDNSServer starts the DNS server
func (c *MasterConfig) RunDNSServer() {
	config, err := dns.NewServerDefaults()
	if err != nil {
		glog.Fatalf("Could not start DNS: %v", err)
	}
	switch c.Options.DNSConfig.BindNetwork {
	case "tcp":
		config.BindNetwork = "ip"
	case "tcp4":
		config.BindNetwork = "ipv4"
	case "tcp6":
		config.BindNetwork = "ipv6"
	}
	config.DnsAddr = c.Options.DNSConfig.BindAddress
	config.NoRec = !c.Options.DNSConfig.AllowRecursiveQueries

	_, port, err := net.SplitHostPort(c.Options.DNSConfig.BindAddress)
	if err != nil {
		glog.Fatalf("Could not start DNS: %v", err)
	}
	if port != "53" {
		glog.Warningf("Binding DNS on port %v instead of 53, which may not be resolvable from all clients", port)
	}

	if ok, err := cmdutil.TryListen(c.Options.DNSConfig.BindNetwork, c.Options.DNSConfig.BindAddress); !ok {
		glog.Warningf("Could not start DNS: %v", err)
		return
	}

	go func() {
		etcdClient, err := etcd.GetAndTestEtcdClient(c.Options.EtcdClientInfo)
		if err != nil {
			glog.Fatalf("Could not get etcd client: %v", err)
			return
		}
		err = dns.ListenAndServe(config, c.DNSServerClient(), etcdClient)
		glog.Fatalf("Could not start DNS: %v", err)
	}()

	cmdutil.WaitForSuccessfulDial(false, "tcp", c.Options.DNSConfig.BindAddress, 100*time.Millisecond, 100*time.Millisecond, 100)

	glog.Infof("DNS listening at %s", c.Options.DNSConfig.BindAddress)
}
Exemplo n.º 3
0
// RunDNSServer starts the DNS server
func (c *MasterConfig) RunDNSServer() {
	config, err := dns.NewServerDefaults()
	if err != nil {
		glog.Fatalf("Could not start DNS: %v", err)
	}
	switch c.Options.DNSConfig.BindNetwork {
	case "tcp":
		config.BindNetwork = "ip"
	case "tcp4":
		config.BindNetwork = "ipv4"
	case "tcp6":
		config.BindNetwork = "ipv6"
	}
	config.DnsAddr = c.Options.DNSConfig.BindAddress
	config.NoRec = !c.Options.DNSConfig.AllowRecursiveQueries

	_, port, err := net.SplitHostPort(c.Options.DNSConfig.BindAddress)
	if err != nil {
		glog.Fatalf("Could not start DNS: %v", err)
	}
	if port != "53" {
		glog.Warningf("Binding DNS on port %v instead of 53 (you may need to run as root and update your config), using %s which will not resolve from all locations", port, c.Options.DNSConfig.BindAddress)
	}

	if ok, err := cmdutil.TryListen(c.Options.DNSConfig.BindNetwork, c.Options.DNSConfig.BindAddress); !ok {
		glog.Warningf("Could not start DNS: %v", err)
		return
	}

	go func() {
		err := dns.ListenAndServe(config, c.DNSServerClient(), c.EtcdClient)
		glog.Fatalf("Could not start DNS: %v", err)
	}()

	cmdutil.WaitForSuccessfulDial(false, "tcp", c.Options.DNSConfig.BindAddress, 100*time.Millisecond, 100*time.Millisecond, 100)

	glog.Infof("DNS listening at %s", c.Options.DNSConfig.BindAddress)
}
Exemplo n.º 4
0
func BuildKubernetesNodeConfig(options configapi.NodeConfig, enableProxy, enableDNS bool) (*NodeConfig, error) {
	originClient, _, err := configapi.GetOpenShiftClient(options.MasterKubeConfig, options.MasterClientConnectionOverrides)
	if err != nil {
		return nil, err
	}
	_, kubeClient, _, err := configapi.GetKubeClient(options.MasterKubeConfig, options.MasterClientConnectionOverrides)
	if err != nil {
		return nil, err
	}
	// Make a separate client for event reporting, to avoid event QPS blocking node calls
	_, eventClient, _, err := configapi.GetKubeClient(options.MasterKubeConfig, options.MasterClientConnectionOverrides)
	if err != nil {
		return nil, err
	}

	if options.NodeName == "localhost" {
		glog.Warningf(`Using "localhost" as node name will not resolve from all locations`)
	}

	clientCAs, err := kcrypto.CertPoolFromFile(options.ServingInfo.ClientCA)
	if err != nil {
		return nil, err
	}

	imageTemplate := variable.NewDefaultImageTemplate()
	imageTemplate.Format = options.ImageConfig.Format
	imageTemplate.Latest = options.ImageConfig.Latest

	var path string
	var fileCheckInterval int64
	if options.PodManifestConfig != nil {
		path = options.PodManifestConfig.Path
		fileCheckInterval = options.PodManifestConfig.FileCheckIntervalSeconds
	}

	kubeAddressStr, kubePortStr, err := net.SplitHostPort(options.ServingInfo.BindAddress)
	if err != nil {
		return nil, fmt.Errorf("cannot parse node address: %v", err)
	}
	kubePort, err := strconv.Atoi(kubePortStr)
	if err != nil {
		return nil, fmt.Errorf("cannot parse node port: %v", err)
	}

	if err = validateNetworkPluginName(originClient, options.NetworkConfig.NetworkPluginName); err != nil {
		return nil, err
	}

	// Defaults are tested in TestKubeletDefaults
	server := kubeletoptions.NewKubeletServer()
	// Adjust defaults
	server.RequireKubeConfig = true
	server.PodManifestPath = path
	server.RootDirectory = options.VolumeDirectory
	server.NodeIP = options.NodeIP
	server.HostnameOverride = options.NodeName
	server.AllowPrivileged = true
	server.RegisterNode = true
	server.Address = kubeAddressStr
	server.Port = int32(kubePort)
	server.ReadOnlyPort = 0        // no read only access
	server.CAdvisorPort = 0        // no unsecured cadvisor access
	server.HealthzPort = 0         // no unsecured healthz access
	server.HealthzBindAddress = "" // no unsecured healthz access
	server.ClusterDNS = options.DNSIP
	server.ClusterDomain = options.DNSDomain
	server.NetworkPluginName = options.NetworkConfig.NetworkPluginName
	server.HostNetworkSources = []string{kubelettypes.ApiserverSource, kubelettypes.FileSource}
	server.HostPIDSources = []string{kubelettypes.ApiserverSource, kubelettypes.FileSource}
	server.HostIPCSources = []string{kubelettypes.ApiserverSource, kubelettypes.FileSource}
	server.HTTPCheckFrequency = unversioned.Duration{Duration: time.Duration(0)} // no remote HTTP pod creation access
	server.FileCheckFrequency = unversioned.Duration{Duration: time.Duration(fileCheckInterval) * time.Second}
	server.PodInfraContainerImage = imageTemplate.ExpandOrDie("pod")
	server.CPUCFSQuota = true // enable cpu cfs quota enforcement by default
	server.MaxPods = 250
	server.PodsPerCore = 10
	server.SerializeImagePulls = false          // disable serialized image pulls by default
	server.EnableControllerAttachDetach = false // stay consistent with existing config, but admins should enable it
	if enableDNS {
		// if we are running local DNS, skydns will load the default recursive nameservers for us
		server.ResolverConfig = ""
	}
	server.DockerExecHandlerName = string(options.DockerConfig.ExecHandlerName)

	if sdnapi.IsOpenShiftNetworkPlugin(server.NetworkPluginName) {
		// set defaults for openshift-sdn
		server.HairpinMode = componentconfig.HairpinNone
		server.ConfigureCBR0 = false
	}

	// prevents kube from generating certs
	server.TLSCertFile = options.ServingInfo.ServerCert.CertFile
	server.TLSPrivateKeyFile = options.ServingInfo.ServerCert.KeyFile

	containerized := cmdutil.Env("OPENSHIFT_CONTAINERIZED", "") == "true"
	server.Containerized = containerized

	// resolve extended arguments
	// TODO: this should be done in config validation (along with the above) so we can provide
	// proper errors
	if err := cmdflags.Resolve(options.KubeletArguments, server.AddFlags); len(err) > 0 {
		return nil, kerrors.NewAggregate(err)
	}

	proxyconfig, err := buildKubeProxyConfig(options)
	if err != nil {
		return nil, err
	}

	// Initialize SDN before building kubelet config so it can modify options
	iptablesSyncPeriod, err := time.ParseDuration(options.IPTablesSyncPeriod)
	if err != nil {
		return nil, fmt.Errorf("Cannot parse the provided ip-tables sync period (%s) : %v", options.IPTablesSyncPeriod, err)
	}
	sdnPlugin, err := sdnplugin.NewNodePlugin(options.NetworkConfig.NetworkPluginName, originClient, kubeClient, options.NodeName, options.NodeIP, iptablesSyncPeriod, options.NetworkConfig.MTU)
	if err != nil {
		return nil, fmt.Errorf("SDN initialization failed: %v", err)
	}
	if sdnPlugin != nil {
		// SDN plugin pod setup/teardown is implemented as a CNI plugin
		server.NetworkPluginName = kubeletcni.CNIPluginName
		server.NetworkPluginDir = kubeletcni.DefaultNetDir
		server.HairpinMode = componentconfig.HairpinNone
		server.ConfigureCBR0 = false
	}

	deps, err := kubeletapp.UnsecuredKubeletDeps(server)
	if err != nil {
		return nil, err
	}

	// Initialize cloud provider
	cloud, err := buildCloudProvider(server)
	if err != nil {
		return nil, err
	}
	deps.Cloud = cloud

	// Replace the kubelet-created CNI plugin with the SDN plugin
	// Kubelet must be initialized with NetworkPluginName="cni" but
	// the SDN plugin (if available) needs to be the only one used
	if sdnPlugin != nil {
		deps.NetworkPlugins = []kubeletnetwork.NetworkPlugin{sdnPlugin}
	}

	// provide any config overrides
	//deps.NodeName = options.NodeName
	deps.KubeClient = kubeClient
	deps.EventClient = eventClient

	// Setup auth
	authnTTL, err := time.ParseDuration(options.AuthConfig.AuthenticationCacheTTL)
	if err != nil {
		return nil, err
	}
	authn, err := newAuthenticator(kubeClient.Authentication(), clientCAs, authnTTL, options.AuthConfig.AuthenticationCacheSize)
	if err != nil {
		return nil, err
	}

	authzAttr, err := newAuthorizerAttributesGetter(options.NodeName)
	if err != nil {
		return nil, err
	}

	authzTTL, err := time.ParseDuration(options.AuthConfig.AuthorizationCacheTTL)
	if err != nil {
		return nil, err
	}
	authz, err := newAuthorizer(originClient, authzTTL, options.AuthConfig.AuthorizationCacheSize)
	if err != nil {
		return nil, err
	}

	deps.Auth = kubeletserver.NewKubeletAuth(authn, authzAttr, authz)

	// TODO: could be cleaner
	if configapi.UseTLS(options.ServingInfo) {
		extraCerts, err := configapi.GetNamedCertificateMap(options.ServingInfo.NamedCertificates)
		if err != nil {
			return nil, err
		}
		deps.TLSOptions = &kubeletserver.TLSOptions{
			Config: crypto.SecureTLSConfig(&tls.Config{
				// RequestClientCert lets us request certs, but allow requests without client certs
				// Verification is done by the authn layer
				ClientAuth: tls.RequestClientCert,
				ClientCAs:  clientCAs,
				// Set SNI certificate func
				// Do not use NameToCertificate, since that requires certificates be included in the server's tlsConfig.Certificates list,
				// which we do not control when running with http.Server#ListenAndServeTLS
				GetCertificate: cmdutil.GetCertificateFunc(extraCerts),
			}),
			CertFile: options.ServingInfo.ServerCert.CertFile,
			KeyFile:  options.ServingInfo.ServerCert.KeyFile,
		}
	} else {
		deps.TLSOptions = nil
	}

	sdnProxy, err := sdnplugin.NewProxyPlugin(options.NetworkConfig.NetworkPluginName, originClient, kubeClient)
	if err != nil {
		return nil, fmt.Errorf("SDN proxy initialization failed: %v", err)
	}

	config := &NodeConfig{
		BindAddress: options.ServingInfo.BindAddress,

		AllowDisabledDocker: options.AllowDisabledDocker,
		Containerized:       containerized,

		Client: kubeClient,

		VolumeDir: options.VolumeDirectory,

		KubeletServer: server,
		KubeletDeps:   deps,

		ServicesReady: make(chan struct{}),

		ProxyConfig:    proxyconfig,
		EnableUnidling: options.EnableUnidling,

		SDNPlugin: sdnPlugin,
		SDNProxy:  sdnProxy,
	}

	if enableDNS {
		dnsConfig, err := dns.NewServerDefaults()
		if err != nil {
			return nil, fmt.Errorf("DNS configuration was not possible: %v", err)
		}
		if len(options.DNSIP) > 0 {
			dnsConfig.DnsAddr = options.DNSIP + ":53"
		}
		dnsConfig.Domain = server.ClusterDomain + "."
		dnsConfig.Local = "openshift.default.svc." + dnsConfig.Domain

		services, serviceStore := dns.NewCachedServiceAccessorAndStore()
		endpoints, endpointsStore := dns.NewCachedEndpointsAccessorAndStore()
		if !enableProxy {
			endpoints = deps.KubeClient
			endpointsStore = nil
		}

		// TODO: use kubeletConfig.ResolverConfig as an argument to etcd in the event the
		//   user sets it, instead of passing it to the kubelet.

		config.ServiceStore = serviceStore
		config.EndpointsStore = endpointsStore
		config.DNSServer = &dns.Server{
			Config:      dnsConfig,
			Services:    services,
			Endpoints:   endpoints,
			MetricsName: "node",
		}
	}

	return config, nil
}
Exemplo n.º 5
0
func BuildKubernetesNodeConfig(options configapi.NodeConfig, enableProxy, enableDNS bool) (*NodeConfig, error) {
	originClient, osClientConfig, err := configapi.GetOpenShiftClient(options.MasterKubeConfig)
	if err != nil {
		return nil, err
	}
	kubeClient, _, err := configapi.GetKubeClient(options.MasterKubeConfig)
	if err != nil {
		return nil, err
	}
	// Make a separate client for event reporting, to avoid event QPS blocking node calls
	eventClient, _, err := configapi.GetKubeClient(options.MasterKubeConfig)
	if err != nil {
		return nil, err
	}

	if options.NodeName == "localhost" {
		glog.Warningf(`Using "localhost" as node name will not resolve from all locations`)
	}

	clientCAs, err := kcrypto.CertPoolFromFile(options.ServingInfo.ClientCA)
	if err != nil {
		return nil, err
	}

	imageTemplate := variable.NewDefaultImageTemplate()
	imageTemplate.Format = options.ImageConfig.Format
	imageTemplate.Latest = options.ImageConfig.Latest

	var path string
	var fileCheckInterval int64
	if options.PodManifestConfig != nil {
		path = options.PodManifestConfig.Path
		fileCheckInterval = options.PodManifestConfig.FileCheckIntervalSeconds
	}

	var dockerExecHandler dockertools.ExecHandler

	switch options.DockerConfig.ExecHandlerName {
	case configapi.DockerExecHandlerNative:
		dockerExecHandler = &dockertools.NativeExecHandler{}
	case configapi.DockerExecHandlerNsenter:
		dockerExecHandler = &dockertools.NsenterExecHandler{}
	}

	kubeAddressStr, kubePortStr, err := net.SplitHostPort(options.ServingInfo.BindAddress)
	if err != nil {
		return nil, fmt.Errorf("cannot parse node address: %v", err)
	}
	kubePort, err := strconv.Atoi(kubePortStr)
	if err != nil {
		return nil, fmt.Errorf("cannot parse node port: %v", err)
	}

	options.NetworkConfig.NetworkPluginName, err = validateAndGetNetworkPluginName(originClient, options.NetworkConfig.NetworkPluginName)
	if err != nil {
		return nil, err
	}

	// Defaults are tested in TestKubeletDefaults
	server := kubeletoptions.NewKubeletServer()
	// Adjust defaults
	server.Config = path
	server.RootDirectory = options.VolumeDirectory
	server.NodeIP = options.NodeIP
	server.HostnameOverride = options.NodeName
	server.AllowPrivileged = true
	server.RegisterNode = true
	server.Address = kubeAddressStr
	server.Port = uint(kubePort)
	server.ReadOnlyPort = 0        // no read only access
	server.CAdvisorPort = 0        // no unsecured cadvisor access
	server.HealthzPort = 0         // no unsecured healthz access
	server.HealthzBindAddress = "" // no unsecured healthz access
	server.ClusterDNS = options.DNSIP
	server.ClusterDomain = options.DNSDomain
	server.NetworkPluginName = options.NetworkConfig.NetworkPluginName
	server.HostNetworkSources = strings.Join([]string{kubelettypes.ApiserverSource, kubelettypes.FileSource}, ",")
	server.HostPIDSources = strings.Join([]string{kubelettypes.ApiserverSource, kubelettypes.FileSource}, ",")
	server.HostIPCSources = strings.Join([]string{kubelettypes.ApiserverSource, kubelettypes.FileSource}, ",")
	server.HTTPCheckFrequency = unversioned.Duration{Duration: time.Duration(0)} // no remote HTTP pod creation access
	server.FileCheckFrequency = unversioned.Duration{Duration: time.Duration(fileCheckInterval) * time.Second}
	server.PodInfraContainerImage = imageTemplate.ExpandOrDie("pod")
	server.CPUCFSQuota = true // enable cpu cfs quota enforcement by default
	server.MaxPods = 110
	server.SerializeImagePulls = false // disable serial image pulls by default
	if enableDNS {
		// if we are running local DNS, skydns will load the default recursive nameservers for us
		server.ResolverConfig = ""
	}

	if sdnovs.IsOpenShiftNetworkPlugin(server.NetworkPluginName) {
		// set defaults for openshift-sdn
		server.HairpinMode = componentconfig.HairpinNone
		server.ConfigureCBR0 = false
	}

	// prevents kube from generating certs
	server.TLSCertFile = options.ServingInfo.ServerCert.CertFile
	server.TLSPrivateKeyFile = options.ServingInfo.ServerCert.KeyFile

	containerized := cmdutil.Env("OPENSHIFT_CONTAINERIZED", "") == "true"
	server.Containerized = containerized

	// resolve extended arguments
	// TODO: this should be done in config validation (along with the above) so we can provide
	// proper errors
	if err := cmdflags.Resolve(options.KubeletArguments, server.AddFlags); len(err) > 0 {
		return nil, kerrors.NewAggregate(err)
	}

	proxyconfig, err := buildKubeProxyConfig(options)
	if err != nil {
		return nil, err
	}

	cfg, err := kubeletapp.UnsecuredKubeletConfig(server)
	if err != nil {
		return nil, err
	}

	// provide any config overrides
	cfg.NodeName = options.NodeName
	cfg.KubeClient = clientadapter.FromUnversionedClient(kubeClient)
	cfg.EventClient = clientadapter.FromUnversionedClient(eventClient)
	cfg.DockerExecHandler = dockerExecHandler

	// Setup auth
	authnTTL, err := time.ParseDuration(options.AuthConfig.AuthenticationCacheTTL)
	if err != nil {
		return nil, err
	}
	authn, err := newAuthenticator(clientCAs, clientcmd.AnonymousClientConfig(osClientConfig), authnTTL, options.AuthConfig.AuthenticationCacheSize)
	if err != nil {
		return nil, err
	}

	authzAttr, err := newAuthorizerAttributesGetter(options.NodeName)
	if err != nil {
		return nil, err
	}

	authzTTL, err := time.ParseDuration(options.AuthConfig.AuthorizationCacheTTL)
	if err != nil {
		return nil, err
	}
	authz, err := newAuthorizer(originClient, authzTTL, options.AuthConfig.AuthorizationCacheSize)
	if err != nil {
		return nil, err
	}

	cfg.Auth = kubeletserver.NewKubeletAuth(authn, authzAttr, authz)

	// Make sure the node doesn't think it is in standalone mode
	// This is required for the node to enforce nodeSelectors on pods, to set hostIP on pod status updates, etc
	cfg.StandaloneMode = false

	// TODO: could be cleaner
	if configapi.UseTLS(options.ServingInfo) {
		extraCerts, err := configapi.GetNamedCertificateMap(options.ServingInfo.NamedCertificates)
		if err != nil {
			return nil, err
		}
		cfg.TLSOptions = &kubeletserver.TLSOptions{
			Config: crypto.SecureTLSConfig(&tls.Config{
				// RequestClientCert lets us request certs, but allow requests without client certs
				// Verification is done by the authn layer
				ClientAuth: tls.RequestClientCert,
				ClientCAs:  clientCAs,
				// Set SNI certificate func
				// Do not use NameToCertificate, since that requires certificates be included in the server's tlsConfig.Certificates list,
				// which we do not control when running with http.Server#ListenAndServeTLS
				GetCertificate: cmdutil.GetCertificateFunc(extraCerts),
			}),
			CertFile: options.ServingInfo.ServerCert.CertFile,
			KeyFile:  options.ServingInfo.ServerCert.KeyFile,
		}
	} else {
		cfg.TLSOptions = nil
	}

	// Prepare cloud provider
	cloud, err := cloudprovider.InitCloudProvider(server.CloudProvider, server.CloudConfigFile)
	if err != nil {
		return nil, err
	}
	if cloud != nil {
		glog.V(2).Infof("Successfully initialized cloud provider: %q from the config file: %q\n", server.CloudProvider, server.CloudConfigFile)
	}
	cfg.Cloud = cloud

	iptablesSyncPeriod, err := time.ParseDuration(options.IPTablesSyncPeriod)
	if err != nil {
		return nil, fmt.Errorf("Cannot parse the provided ip-tables sync period (%s) : %v", options.IPTablesSyncPeriod, err)
	}
	sdnPlugin, err := sdnfactory.NewNodePlugin(options.NetworkConfig.NetworkPluginName, originClient, kubeClient, options.NodeName, options.NodeIP, iptablesSyncPeriod)
	if err != nil {
		return nil, fmt.Errorf("SDN initialization failed: %v", err)
	}
	if sdnPlugin != nil {
		cfg.NetworkPlugins = append(cfg.NetworkPlugins, sdnPlugin)
	}

	endpointFilter, err := sdnfactory.NewProxyPlugin(options.NetworkConfig.NetworkPluginName, originClient, kubeClient)
	if err != nil {
		return nil, fmt.Errorf("SDN proxy initialization failed: %v", err)
	}

	config := &NodeConfig{
		BindAddress: options.ServingInfo.BindAddress,

		AllowDisabledDocker: options.AllowDisabledDocker,
		Containerized:       containerized,

		Client: kubeClient,

		VolumeDir: options.VolumeDirectory,

		KubeletServer: server,
		KubeletConfig: cfg,

		ServicesReady: make(chan struct{}),

		ProxyConfig: proxyconfig,

		MTU: options.NetworkConfig.MTU,

		SDNPlugin:                 sdnPlugin,
		FilteringEndpointsHandler: endpointFilter,
	}

	if enableDNS {
		dnsConfig, err := dns.NewServerDefaults()
		if err != nil {
			return nil, fmt.Errorf("DNS configuration was not possible: %v", err)
		}
		if len(options.DNSIP) > 0 {
			dnsConfig.DnsAddr = options.DNSIP + ":53"
		}
		dnsConfig.Domain = server.ClusterDomain + "."
		dnsConfig.Local = "openshift.default.svc." + dnsConfig.Domain

		services, serviceStore := dns.NewCachedServiceAccessorAndStore()
		endpoints, endpointsStore := dns.NewCachedEndpointsAccessorAndStore()
		if !enableProxy {
			endpoints = kubeClient
			endpointsStore = nil
		}

		// TODO: use kubeletConfig.ResolverConfig as an argument to etcd in the event the
		//   user sets it, instead of passing it to the kubelet.

		config.ServiceStore = serviceStore
		config.EndpointsStore = endpointsStore
		config.DNSServer = &dns.Server{
			Config:      dnsConfig,
			Services:    services,
			Endpoints:   endpoints,
			MetricsName: "node",
		}
	}

	return config, nil
}