// Ensures that the Docker daemon is in the desired container.
func ensureDockerInContainer(cadvisor cadvisor.Interface, oomScoreAdj int, manager *fs.Manager) error {
	// What container is Docker in?
	out, err := exec.Command("pidof", "docker").Output()
	if err != nil {
		return fmt.Errorf("failed to find pid of Docker container: %v", err)
	}

	// The output of pidof is a list of pids.
	// Docker may be forking and thus there would be more than one result.
	pids := []int{}
	for _, pidStr := range strings.Split(strings.TrimSpace(string(out)), " ") {
		pid, err := strconv.Atoi(pidStr)
		if err != nil {
			continue
		}
		pids = append(pids, pid)
	}

	// Move if the pid is not already in the desired container.
	errs := []error{}
	for _, pid := range pids {
		cont, err := getContainer(pid)
		if err != nil {
			errs = append(errs, fmt.Errorf("failed to find container of PID %d: %v", pid, err))
		}

		if cont != manager.Cgroups.Name {
			err = manager.Apply(pid)
			if err != nil {
				errs = append(errs, fmt.Errorf("failed to move PID %d (in %q) to %q", pid, cont, manager.Cgroups.Name))
			}
		}

		// Also apply oom_score_adj to processes
		if err := util.ApplyOomScoreAdj(pid, oomScoreAdj); err != nil {
			errs = append(errs, fmt.Errorf("failed to apply oom score %d to PID %d", oomScoreAdj, pid))
		}
	}

	return errors.NewAggregate(errs)
}
Пример #2
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.
	if err := util.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.Forever(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)
	}

	if s.RunOnce {
		return nil
	}

	// run forever
	select {}
}
Пример #3
0
// Run runs the specified KubeletExecutorServer.
func (s *KubeletExecutorServer) Run(hks hyperkube.Interface, _ []string) error {
	rand.Seed(time.Now().UTC().UnixNano())

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

	// derive the executor cgroup and use it as docker cgroup root
	mesosCgroup := findMesosCgroup(s.cgroupPrefix)
	s.cgroupRoot = mesosCgroup
	s.SystemContainer = mesosCgroup
	s.ResourceContainer = mesosCgroup
	log.V(2).Infof("passing cgroup %q to the kubelet as cgroup root", s.CgroupRoot)

	// 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 dockerExecHandler dockertools.ExecHandler
	switch s.DockerExecHandlerName {
	case "native":
		dockerExecHandler = &dockertools.NativeExecHandler{}
	case "nsenter":
		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,
	}

	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.Forever(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)
	}

	// block until executor is shut down or commits shutdown
	select {}
}
Пример #4
0
// Run runs the specified ProxyServer.  This should never exit.
func (s *ProxyServer) Run(_ []string) error {
	// TODO(vmarmol): Use container config for this.
	if err := util.ApplyOomScoreAdj(0, s.OOMScoreAdj); err != nil {
		glog.V(2).Info(err)
	}

	// Run in its own container.
	if err := util.RunInResourceContainer(s.ResourceContainer); err != nil {
		glog.Warningf("Failed to start in resource-only container %q: %v", s.ResourceContainer, err)
	} else {
		glog.V(2).Infof("Running in resource-only container %q", s.ResourceContainer)
	}

	serviceConfig := config.NewServiceConfig()
	endpointsConfig := config.NewEndpointsConfig()

	protocol := iptables.ProtocolIpv4
	if net.IP(s.BindAddress).To4() == nil {
		protocol = iptables.ProtocolIpv6
	}
	loadBalancer := proxy.NewLoadBalancerRR()
	proxier, err := proxy.NewProxier(loadBalancer, net.IP(s.BindAddress), iptables.New(exec.New(), protocol), s.PortRange)
	if err != nil {
		glog.Fatalf("Unable to create proxer: %v", err)
	}

	// Wire proxier to handle changes to services
	serviceConfig.RegisterHandler(proxier)
	// And wire loadBalancer to handle changes to endpoints to services
	endpointsConfig.RegisterHandler(loadBalancer)

	// Note: RegisterHandler() calls need to happen before creation of Sources because sources
	// only notify on changes, and the initial update (on process start) may be lost if no handlers
	// are registered yet.

	// define api config source
	if s.Kubeconfig == "" && s.Master == "" {
		glog.Warningf("Neither --kubeconfig nor --master was specified.  Using default API client.  This might not work.")
	}

	// This creates a client, first loading any specified kubeconfig
	// file, and then overriding the Master flag, if non-empty.
	kubeconfig, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
		&clientcmd.ClientConfigLoadingRules{ExplicitPath: s.Kubeconfig},
		&clientcmd.ConfigOverrides{ClusterInfo: clientcmdapi.Cluster{Server: s.Master}}).ClientConfig()
	if err != nil {
		return err
	}

	client, err := client.New(kubeconfig)
	if err != nil {
		glog.Fatalf("Invalid API configuration: %v", err)
	}

	config.NewSourceAPI(
		client,
		30*time.Second,
		serviceConfig.Channel("api"),
		endpointsConfig.Channel("api"),
	)

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

	// Just loop forever for now...
	proxier.SyncLoop()
	return nil
}
Пример #5
0
// Run runs the specified KubeletServer.  This should never exit.
func (s *KubeletServer) Run(_ []string) error {
	util.ReallyCrash = s.ReallyCrashForTesting
	rand.Seed(time.Now().UTC().UnixNano())

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

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

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

	credentialprovider.SetPreferredDockercfgPath(s.RootDirectory)

	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,
	}
	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)

	manifestURLHeader := make(http.Header)
	if s.ManifestURLHeader != "" {
		pieces := strings.Split(s.ManifestURLHeader, ":")
		if len(pieces) != 2 {
			return fmt.Errorf("manifest-url-header must have a single ':' key-value separator, got %q", s.ManifestURLHeader)
		}
		manifestURLHeader.Set(pieces[0], pieces[1])
	}

	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 {
		glog.V(2).Info("Running kubelet in containerized mode (experimental)")
		mounter = mount.NewNsenterMounter()
	}

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

	kcfg := KubeletConfig{
		Address:                        s.Address,
		AllowPrivileged:                s.AllowPrivileged,
		HostNetworkSources:             hostNetworkSources,
		HostnameOverride:               s.HostnameOverride,
		RootDirectory:                  s.RootDirectory,
		ConfigFile:                     s.Config,
		ManifestURL:                    s.ManifestURL,
		ManifestURLHeader:              manifestURLHeader,
		FileCheckFrequency:             s.FileCheckFrequency,
		HTTPCheckFrequency:             s.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:                 (len(s.APIServerList) == 0),
		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:                  ProbeVolumePlugins(),
		NetworkPlugins:                 ProbeNetworkPlugins(s.NetworkPluginDir),
		NetworkPluginName:              s.NetworkPluginName,
		StreamingConnectionIdleTimeout: s.StreamingConnectionIdleTimeout,
		TLSOptions:                     tlsOptions,
		ImageGCPolicy:                  imageGCPolicy,
		DiskSpacePolicy:                diskSpacePolicy,
		Cloud:                          cloud,
		NodeStatusUpdateFrequency: s.NodeStatusUpdateFrequency,
		ResourceContainer:         s.ResourceContainer,
		CgroupRoot:                s.CgroupRoot,
		ContainerRuntime:          s.ContainerRuntime,
		Mounter:                   mounter,
		DockerDaemonContainer:     s.DockerDaemonContainer,
		SystemContainer:           s.SystemContainer,
		ConfigureCBR0:             s.ConfigureCBR0,
		PodCIDR:                   s.PodCIDR,
		MaxPods:                   s.MaxPods,
		DockerExecHandler:         dockerExecHandler,
	}

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

	if s.HealthzPort > 0 {
		healthz.DefaultHealthz()
		go util.Forever(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)
	}

	if s.RunOnce {
		return nil
	}

	// run forever
	select {}
}