Esempio n. 1
0
// Run runs the specified KubeletServer for the given KubeletConfig.  This should never exit.
// The kcfg argument may be nil - if so, it is initialized from the settings on KubeletServer.
// Otherwise, the caller is assumed to have set up the KubeletConfig object and all defaults
// will be ignored.
func (s *KubeletServer) Run(kcfg *KubeletConfig) error {
	if kcfg == nil {
		cfg, err := s.KubeletConfig()
		if err != nil {
			return err
		}
		kcfg = cfg

		clientConfig, err := s.CreateAPIServerClientConfig()
		if err == nil {
			kcfg.KubeClient, err = client.New(clientConfig)
		}
		if err != nil && len(s.APIServerList) > 0 {
			glog.Warningf("No API client: %v", err)
		}

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

	if kcfg.CAdvisorInterface == nil {
		ca, err := cadvisor.New(s.CAdvisorPort)
		if err != nil {
			return err
		}
		kcfg.CAdvisorInterface = ca
	}

	util.ReallyCrash = s.ReallyCrashForTesting
	rand.Seed(time.Now().UTC().UnixNano())

	credentialprovider.SetPreferredDockercfgPath(s.RootDirectory)

	glog.V(2).Infof("Using root directory: %v", s.RootDirectory)

	// TODO(vmarmol): Do this through container config.
	oomAdjuster := oom.NewOomAdjuster()
	if err := oomAdjuster.ApplyOomScoreAdj(0, s.OOMScoreAdj); err != nil {
		glog.Warning(err)
	}

	if err := RunKubelet(kcfg, nil); err != nil {
		return err
	}

	if s.HealthzPort > 0 {
		healthz.DefaultHealthz()
		go util.Until(func() {
			err := http.ListenAndServe(net.JoinHostPort(s.HealthzBindAddress.String(), strconv.Itoa(s.HealthzPort)), nil)
			if err != nil {
				glog.Errorf("Starting health server failed: %v", err)
			}
		}, 5*time.Second, util.NeverStop)
	}

	if s.RunOnce {
		return nil
	}

	// run forever
	select {}
}
Esempio n. 2
0
// RunKubelet is responsible for setting up and running a kubelet.  It is used in three different applications:
//   1 Integration tests
//   2 Kubelet binary
//   3 Standalone 'kubernetes' binary
// Eventually, #2 will be replaced with instances of #3
func RunKubelet(kcfg *KubeletConfig, builder KubeletBuilder) error {
	kcfg.Hostname = nodeutil.GetHostname(kcfg.HostnameOverride)

	if len(kcfg.NodeName) == 0 {
		// Query the cloud provider for our node name, default to Hostname
		nodeName := kcfg.Hostname
		if kcfg.Cloud != nil {
			var err error
			instances, ok := kcfg.Cloud.Instances()
			if !ok {
				return fmt.Errorf("failed to get instances from cloud provider")
			}

			nodeName, err = instances.CurrentNodeName(kcfg.Hostname)
			if err != nil {
				return fmt.Errorf("error fetching current instance name from cloud provider: %v", err)
			}

			glog.V(2).Infof("cloud provider determined current node name to be %s", nodeName)
		}

		kcfg.NodeName = nodeName
	}

	eventBroadcaster := record.NewBroadcaster()
	kcfg.Recorder = eventBroadcaster.NewRecorder(api.EventSource{Component: "kubelet", Host: kcfg.NodeName})
	eventBroadcaster.StartLogging(glog.V(3).Infof)
	if kcfg.KubeClient != nil {
		glog.V(4).Infof("Sending events to api server.")
		if kcfg.EventRecordQPS == 0.0 {
			eventBroadcaster.StartRecordingToSink(kcfg.KubeClient.Events(""))
		} else {
			eventClient := *kcfg.KubeClient
			eventClient.Throttle = util.NewTokenBucketRateLimiter(kcfg.EventRecordQPS, kcfg.EventBurst)
			eventBroadcaster.StartRecordingToSink(eventClient.Events(""))
		}
	} else {
		glog.Warning("No api server defined - no events will be sent to API server.")
	}

	privilegedSources := capabilities.PrivilegedSources{
		HostNetworkSources: kcfg.HostNetworkSources,
		HostPIDSources:     kcfg.HostPIDSources,
		HostIPCSources:     kcfg.HostIPCSources,
	}
	capabilities.Setup(kcfg.AllowPrivileged, privilegedSources, 0)

	credentialprovider.SetPreferredDockercfgPath(kcfg.RootDirectory)

	if builder == nil {
		builder = createAndInitKubelet
	}
	if kcfg.OSInterface == nil {
		kcfg.OSInterface = kubecontainer.RealOS{}
	}
	k, podCfg, err := builder(kcfg)
	if err != nil {
		return fmt.Errorf("failed to create kubelet: %v", err)
	}

	util.ApplyRLimitForSelf(kcfg.MaxOpenFiles)

	// process pods and exit.
	if kcfg.Runonce {
		if _, err := k.RunOnce(podCfg.Updates()); err != nil {
			return fmt.Errorf("runonce failed: %v", err)
		}
		glog.Infof("Started kubelet as runonce")
	} else {
		startKubelet(k, podCfg, kcfg)
		glog.Infof("Started kubelet")
	}
	return nil
}
Esempio n. 3
0
// Run runs the specified KubeletExecutorServer.
func (s *KubeletExecutorServer) Run(hks hyperkube.Interface, _ []string) error {
	rand.Seed(time.Now().UTC().UnixNano())

	oomAdjuster := oom.NewOomAdjuster()
	if err := oomAdjuster.ApplyOomScoreAdj(0, s.OOMScoreAdj); err != nil {
		log.Info(err)
	}

	// empty string for the docker and system containers (= cgroup paths). This
	// stops the kubelet taking any control over other system processes.
	s.SystemContainer = ""
	s.DockerDaemonContainer = ""

	// create apiserver client
	var apiclient *client.Client
	clientConfig, err := s.CreateAPIServerClientConfig()
	if err == nil {
		apiclient, err = client.New(clientConfig)
	}
	if err != nil {
		// required for k8sm since we need to send api.Binding information
		// back to the apiserver
		log.Fatalf("No API client: %v", err)
	}

	log.Infof("Using root directory: %v", s.RootDirectory)
	credentialprovider.SetPreferredDockercfgPath(s.RootDirectory)

	shutdownCloser, err := s.syncExternalShutdownWatcher()
	if err != nil {
		return err
	}

	cAdvisorInterface, err := cadvisor.New(s.CAdvisorPort)
	if err != nil {
		return err
	}

	imageGCPolicy := kubelet.ImageGCPolicy{
		HighThresholdPercent: s.ImageGCHighThresholdPercent,
		LowThresholdPercent:  s.ImageGCLowThresholdPercent,
	}

	diskSpacePolicy := kubelet.DiskSpacePolicy{
		DockerFreeDiskMB: s.LowDiskSpaceThresholdMB,
		RootFreeDiskMB:   s.LowDiskSpaceThresholdMB,
	}

	//TODO(jdef) intentionally NOT initializing a cloud provider here since:
	//(a) the kubelet doesn't actually use it
	//(b) we don't need to create N-kubelet connections to zookeeper for no good reason
	//cloud := cloudprovider.InitCloudProvider(s.CloudProvider, s.CloudConfigFile)
	//log.Infof("Successfully initialized cloud provider: %q from the config file: %q\n", s.CloudProvider, s.CloudConfigFile)

	hostNetworkSources, err := kubelet.GetValidatedSources(strings.Split(s.HostNetworkSources, ","))
	if err != nil {
		return err
	}

	tlsOptions, err := s.InitializeTLS()
	if err != nil {
		return err
	}
	mounter := mount.New()
	if s.Containerized {
		log.V(2).Info("Running kubelet in containerized mode (experimental)")
		mounter = &mount.NsenterMounter{}
	}

	var writer utilio.Writer = &utilio.StdWriter{}
	var dockerExecHandler dockertools.ExecHandler
	switch s.DockerExecHandlerName {
	case "native":
		dockerExecHandler = &dockertools.NativeExecHandler{}
	case "nsenter":
		writer = &utilio.NsenterWriter{}
		dockerExecHandler = &dockertools.NsenterExecHandler{}
	default:
		log.Warningf("Unknown Docker exec handler %q; defaulting to native", s.DockerExecHandlerName)
		dockerExecHandler = &dockertools.NativeExecHandler{}
	}

	kcfg := app.KubeletConfig{
		Address:            s.Address,
		AllowPrivileged:    s.AllowPrivileged,
		HostNetworkSources: hostNetworkSources,
		HostnameOverride:   s.HostnameOverride,
		RootDirectory:      s.RootDirectory,
		// ConfigFile: ""
		// ManifestURL: ""
		FileCheckFrequency: s.FileCheckFrequency,
		// HTTPCheckFrequency
		PodInfraContainerImage:  s.PodInfraContainerImage,
		SyncFrequency:           s.SyncFrequency,
		RegistryPullQPS:         s.RegistryPullQPS,
		RegistryBurst:           s.RegistryBurst,
		MinimumGCAge:            s.MinimumGCAge,
		MaxPerPodContainerCount: s.MaxPerPodContainerCount,
		MaxContainerCount:       s.MaxContainerCount,
		RegisterNode:            s.RegisterNode,
		// StandaloneMode: false
		ClusterDomain:                  s.ClusterDomain,
		ClusterDNS:                     s.ClusterDNS,
		Runonce:                        s.RunOnce,
		Port:                           s.Port,
		ReadOnlyPort:                   s.ReadOnlyPort,
		CAdvisorInterface:              cAdvisorInterface,
		EnableServer:                   s.EnableServer,
		EnableDebuggingHandlers:        s.EnableDebuggingHandlers,
		DockerClient:                   dockertools.ConnectToDockerOrDie(s.DockerEndpoint),
		KubeClient:                     apiclient,
		MasterServiceNamespace:         s.MasterServiceNamespace,
		VolumePlugins:                  app.ProbeVolumePlugins(),
		NetworkPlugins:                 app.ProbeNetworkPlugins(s.NetworkPluginDir),
		NetworkPluginName:              s.NetworkPluginName,
		StreamingConnectionIdleTimeout: s.StreamingConnectionIdleTimeout,
		TLSOptions:                     tlsOptions,
		ImageGCPolicy:                  imageGCPolicy,
		DiskSpacePolicy:                diskSpacePolicy,
		Cloud:                          nil, // TODO(jdef) Cloud, specifying null here because we don't want all kubelets polling mesos-master; need to account for this in the cloudprovider impl
		NodeStatusUpdateFrequency: s.NodeStatusUpdateFrequency,
		ResourceContainer:         s.ResourceContainer,
		CgroupRoot:                s.CgroupRoot,
		ContainerRuntime:          s.ContainerRuntime,
		Mounter:                   mounter,
		DockerDaemonContainer:     s.DockerDaemonContainer,
		SystemContainer:           s.SystemContainer,
		ConfigureCBR0:             s.ConfigureCBR0,
		MaxPods:                   s.MaxPods,
		DockerExecHandler:         dockerExecHandler,
		ResolverConfig:            s.ResolverConfig,
		CPUCFSQuota:               s.CPUCFSQuota,
		Writer:                    writer,
		MaxOpenFiles:              s.MaxOpenFiles,
	}

	kcfg.NodeName = kcfg.Hostname

	err = app.RunKubelet(&kcfg, app.KubeletBuilder(func(kc *app.KubeletConfig) (app.KubeletBootstrap, *kconfig.PodConfig, error) {
		return s.createAndInitKubelet(kc, hks, clientConfig, shutdownCloser)
	}))
	if err != nil {
		return err
	}

	if s.HealthzPort > 0 {
		healthz.DefaultHealthz()
		go util.Until(func() {
			err := http.ListenAndServe(net.JoinHostPort(s.HealthzBindAddress.String(), strconv.Itoa(s.HealthzPort)), nil)
			if err != nil {
				log.Errorf("Starting health server failed: %v", err)
			}
		}, 5*time.Second, util.NeverStop)
	}

	// block until executor is shut down or commits shutdown
	select {}
}