// 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 {}
}
// 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 {}
}