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server.go
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server.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package app makes it easy to create a kubelet server for various contexts.
package app
import (
"crypto/tls"
"fmt"
"math/rand"
"net"
"net/http"
_ "net/http/pprof"
"path"
"strconv"
"strings"
"time"
"github.com/golang/glog"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"k8s.io/kubernetes/cmd/kubelet/app/options"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/resource"
"k8s.io/kubernetes/pkg/apis/componentconfig"
"k8s.io/kubernetes/pkg/capabilities"
"k8s.io/kubernetes/pkg/client/chaosclient"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/client/restclient"
unversionedcore "k8s.io/kubernetes/pkg/client/typed/generated/core/unversioned"
clientauth "k8s.io/kubernetes/pkg/client/unversioned/auth"
"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/credentialprovider"
"k8s.io/kubernetes/pkg/healthz"
"k8s.io/kubernetes/pkg/kubelet"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/cm"
"k8s.io/kubernetes/pkg/kubelet/config"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/dockertools"
"k8s.io/kubernetes/pkg/kubelet/network"
"k8s.io/kubernetes/pkg/kubelet/server"
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/configz"
"k8s.io/kubernetes/pkg/util/flock"
"k8s.io/kubernetes/pkg/util/io"
"k8s.io/kubernetes/pkg/util/mount"
nodeutil "k8s.io/kubernetes/pkg/util/node"
"k8s.io/kubernetes/pkg/util/oom"
"k8s.io/kubernetes/pkg/util/runtime"
"k8s.io/kubernetes/pkg/util/wait"
"k8s.io/kubernetes/pkg/volume"
)
// bootstrapping interface for kubelet, targets the initialization protocol
type KubeletBootstrap interface {
BirthCry()
StartGarbageCollection()
ListenAndServe(address net.IP, port uint, tlsOptions *server.TLSOptions, auth server.AuthInterface, enableDebuggingHandlers bool)
ListenAndServeReadOnly(address net.IP, port uint)
Run(<-chan kubetypes.PodUpdate)
RunOnce(<-chan kubetypes.PodUpdate) ([]kubelet.RunPodResult, error)
}
// create and initialize a Kubelet instance
type KubeletBuilder func(kc *KubeletConfig) (KubeletBootstrap, *config.PodConfig, error)
// NewKubeletCommand creates a *cobra.Command object with default parameters
func NewKubeletCommand() *cobra.Command {
s := options.NewKubeletServer()
s.AddFlags(pflag.CommandLine)
cmd := &cobra.Command{
Use: "kubelet",
Long: `The kubelet is the primary "node agent" that runs on each
node. The kubelet works in terms of a PodSpec. A PodSpec is a YAML or JSON object
that describes a pod. The kubelet takes a set of PodSpecs that are provided through
various mechanisms (primarily through the apiserver) and ensures that the containers
described in those PodSpecs are running and healthy.
Other than from an PodSpec from the apiserver, there are three ways that a container
manifest can be provided to the Kubelet.
File: Path passed as a flag on the command line. This file is rechecked every 20
seconds (configurable with a flag).
HTTP endpoint: HTTP endpoint passed as a parameter on the command line. This endpoint
is checked every 20 seconds (also configurable with a flag).
HTTP server: The kubelet can also listen for HTTP and respond to a simple API
(underspec'd currently) to submit a new manifest.`,
Run: func(cmd *cobra.Command, args []string) {
},
}
return cmd
}
// UnsecuredKubeletConfig returns a KubeletConfig suitable for being run, or an error if the server setup
// is not valid. It will not start any background processes, and does not include authentication/authorization
func UnsecuredKubeletConfig(s *options.KubeletServer) (*KubeletConfig, error) {
hostNetworkSources, err := kubetypes.GetValidatedSources(strings.Split(s.HostNetworkSources, ","))
if err != nil {
return nil, err
}
hostPIDSources, err := kubetypes.GetValidatedSources(strings.Split(s.HostPIDSources, ","))
if err != nil {
return nil, err
}
hostIPCSources, err := kubetypes.GetValidatedSources(strings.Split(s.HostIPCSources, ","))
if err != nil {
return nil, err
}
mounter := mount.New()
var writer io.Writer = &io.StdWriter{}
if s.Containerized {
glog.V(2).Info("Running kubelet in containerized mode (experimental)")
mounter = mount.NewNsenterMounter()
writer = &io.NsenterWriter{}
}
tlsOptions, err := InitializeTLS(s)
if err != nil {
return nil, err
}
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{}
}
imageGCPolicy := kubelet.ImageGCPolicy{
MinAge: s.ImageMinimumGCAge.Duration,
HighThresholdPercent: s.ImageGCHighThresholdPercent,
LowThresholdPercent: s.ImageGCLowThresholdPercent,
}
diskSpacePolicy := kubelet.DiskSpacePolicy{
DockerFreeDiskMB: s.LowDiskSpaceThresholdMB,
RootFreeDiskMB: s.LowDiskSpaceThresholdMB,
}
manifestURLHeader := make(http.Header)
if s.ManifestURLHeader != "" {
pieces := strings.Split(s.ManifestURLHeader, ":")
if len(pieces) != 2 {
return nil, fmt.Errorf("manifest-url-header must have a single ':' key-value separator, got %q", s.ManifestURLHeader)
}
manifestURLHeader.Set(pieces[0], pieces[1])
}
reservation, err := parseReservation(s.KubeReserved, s.SystemReserved)
if err != nil {
return nil, err
}
return &KubeletConfig{
Address: net.ParseIP(s.Address),
AllowPrivileged: s.AllowPrivileged,
Auth: nil, // default does not enforce auth[nz]
CAdvisorInterface: nil, // launches background processes, not set here
VolumeStatsAggPeriod: s.VolumeStatsAggPeriod.Duration,
CgroupRoot: s.CgroupRoot,
Cloud: nil, // cloud provider might start background processes
ClusterDNS: net.ParseIP(s.ClusterDNS),
ClusterDomain: s.ClusterDomain,
ConfigFile: s.Config,
ConfigureCBR0: s.ConfigureCBR0,
ContainerManager: nil,
ContainerRuntime: s.ContainerRuntime,
CPUCFSQuota: s.CPUCFSQuota,
DiskSpacePolicy: diskSpacePolicy,
DockerClient: dockertools.ConnectToDockerOrDie(s.DockerEndpoint),
RuntimeCgroups: s.RuntimeCgroups,
DockerExecHandler: dockerExecHandler,
EnableCustomMetrics: s.EnableCustomMetrics,
EnableDebuggingHandlers: s.EnableDebuggingHandlers,
EnableServer: s.EnableServer,
EventBurst: s.EventBurst,
EventRecordQPS: s.EventRecordQPS,
FileCheckFrequency: s.FileCheckFrequency.Duration,
HostnameOverride: s.HostnameOverride,
HostNetworkSources: hostNetworkSources,
HostPIDSources: hostPIDSources,
HostIPCSources: hostIPCSources,
HTTPCheckFrequency: s.HTTPCheckFrequency.Duration,
ImageGCPolicy: imageGCPolicy,
KubeClient: nil,
ManifestURL: s.ManifestURL,
ManifestURLHeader: manifestURLHeader,
MasterServiceNamespace: s.MasterServiceNamespace,
MaxContainerCount: s.MaxContainerCount,
MaxOpenFiles: s.MaxOpenFiles,
MaxPerPodContainerCount: s.MaxPerPodContainerCount,
MaxPods: s.MaxPods,
MinimumGCAge: s.MinimumGCAge.Duration,
Mounter: mounter,
NetworkPluginName: s.NetworkPluginName,
NetworkPlugins: ProbeNetworkPlugins(s.NetworkPluginDir),
NodeLabels: s.NodeLabels,
NodeStatusUpdateFrequency: s.NodeStatusUpdateFrequency.Duration,
NonMasqueradeCIDR: s.NonMasqueradeCIDR,
OOMAdjuster: oom.NewOOMAdjuster(),
OSInterface: kubecontainer.RealOS{},
PodCIDR: s.PodCIDR,
ReconcileCIDR: s.ReconcileCIDR,
PodInfraContainerImage: s.PodInfraContainerImage,
Port: s.Port,
ReadOnlyPort: s.ReadOnlyPort,
RegisterNode: s.RegisterNode,
RegisterSchedulable: s.RegisterSchedulable,
RegistryBurst: s.RegistryBurst,
RegistryPullQPS: s.RegistryPullQPS,
ResolverConfig: s.ResolverConfig,
Reservation: *reservation,
KubeletCgroups: s.KubeletCgroups,
RktPath: s.RktPath,
RktStage1Image: s.RktStage1Image,
RootDirectory: s.RootDirectory,
Runonce: s.RunOnce,
SerializeImagePulls: s.SerializeImagePulls,
StandaloneMode: (len(s.APIServerList) == 0),
StreamingConnectionIdleTimeout: s.StreamingConnectionIdleTimeout.Duration,
SyncFrequency: s.SyncFrequency.Duration,
SystemCgroups: s.SystemCgroups,
TLSOptions: tlsOptions,
Writer: writer,
VolumePlugins: ProbeVolumePlugins(s.VolumePluginDir),
OutOfDiskTransitionFrequency: s.OutOfDiskTransitionFrequency.Duration,
HairpinMode: s.HairpinMode,
BabysitDaemons: s.BabysitDaemons,
ExperimentalFlannelOverlay: s.ExperimentalFlannelOverlay,
NodeIP: net.ParseIP(s.NodeIP),
}, nil
}
// 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 Run(s *options.KubeletServer, kcfg *KubeletConfig) error {
err := run(s, kcfg)
if err != nil {
glog.Errorf("Failed running kubelet: %v", err)
}
return err
}
func run(s *options.KubeletServer, kcfg *KubeletConfig) (err error) {
if s.LockFilePath != "" {
glog.Infof("aquiring lock on %q", s.LockFilePath)
if err := flock.Acquire(s.LockFilePath); err != nil {
return fmt.Errorf("unable to aquire file lock on %q: %v", s.LockFilePath, err)
}
}
if c, err := configz.New("componentconfig"); err == nil {
c.Set(s.KubeletConfiguration)
} else {
glog.Errorf("unable to register configz: %s", err)
}
if kcfg == nil {
cfg, err := UnsecuredKubeletConfig(s)
if err != nil {
return err
}
kcfg = cfg
clientConfig, err := CreateAPIServerClientConfig(s)
if err == nil {
kcfg.KubeClient, err = clientset.NewForConfig(clientConfig)
// make a separate client for events
eventClientConfig := *clientConfig
eventClientConfig.QPS = s.EventRecordQPS
eventClientConfig.Burst = s.EventBurst
kcfg.EventClient, err = clientset.NewForConfig(&eventClientConfig)
}
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 {
kcfg.CAdvisorInterface, err = cadvisor.New(s.CAdvisorPort)
if err != nil {
return err
}
}
if kcfg.ContainerManager == nil {
if kcfg.SystemCgroups != "" && kcfg.CgroupRoot == "" {
return fmt.Errorf("invalid configuration: system container was specified and cgroup root was not specified")
}
kcfg.ContainerManager, err = cm.NewContainerManager(kcfg.Mounter, kcfg.CAdvisorInterface, cm.NodeConfig{
RuntimeCgroupsName: kcfg.RuntimeCgroups,
SystemCgroupsName: kcfg.SystemCgroups,
KubeletCgroupsName: kcfg.KubeletCgroups,
ContainerRuntime: kcfg.ContainerRuntime,
})
if err != nil {
return err
}
}
runtime.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 := kcfg.OOMAdjuster
if err := oomAdjuster.ApplyOOMScoreAdj(0, s.OOMScoreAdj); err != nil {
glog.Warning(err)
}
if err := RunKubelet(kcfg); err != nil {
return err
}
if s.HealthzPort > 0 {
healthz.DefaultHealthz()
go wait.Until(func() {
err := http.ListenAndServe(net.JoinHostPort(s.HealthzBindAddress, strconv.Itoa(s.HealthzPort)), nil)
if err != nil {
glog.Errorf("Starting health server failed: %v", err)
}
}, 5*time.Second, wait.NeverStop)
}
if s.RunOnce {
return nil
}
// run forever
select {}
}
// InitializeTLS checks for a configured TLSCertFile and TLSPrivateKeyFile: if unspecified a new self-signed
// certificate and key file are generated. Returns a configured server.TLSOptions object.
func InitializeTLS(s *options.KubeletServer) (*server.TLSOptions, error) {
if s.TLSCertFile == "" && s.TLSPrivateKeyFile == "" {
s.TLSCertFile = path.Join(s.CertDirectory, "kubelet.crt")
s.TLSPrivateKeyFile = path.Join(s.CertDirectory, "kubelet.key")
if err := util.GenerateSelfSignedCert(nodeutil.GetHostname(s.HostnameOverride), s.TLSCertFile, s.TLSPrivateKeyFile, nil, nil); err != nil {
return nil, fmt.Errorf("unable to generate self signed cert: %v", err)
}
glog.V(4).Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile)
}
tlsOptions := &server.TLSOptions{
Config: &tls.Config{
// Change default from SSLv3 to TLSv1.0 (because of POODLE vulnerability).
MinVersion: tls.VersionTLS10,
// Populate PeerCertificates in requests, but don't yet reject connections without certificates.
ClientAuth: tls.RequestClientCert,
},
CertFile: s.TLSCertFile,
KeyFile: s.TLSPrivateKeyFile,
}
return tlsOptions, nil
}
func authPathClientConfig(s *options.KubeletServer, useDefaults bool) (*restclient.Config, error) {
authInfo, err := clientauth.LoadFromFile(s.AuthPath.Value())
if err != nil && !useDefaults {
return nil, err
}
// If loading the default auth path, for backwards compatibility keep going
// with the default auth.
if err != nil {
glog.Warningf("Could not load kubernetes auth path %s: %v. Continuing with defaults.", s.AuthPath, err)
}
if authInfo == nil {
// authInfo didn't load correctly - continue with defaults.
authInfo = &clientauth.Info{}
}
authConfig, err := authInfo.MergeWithConfig(restclient.Config{})
if err != nil {
return nil, err
}
authConfig.Host = s.APIServerList[0]
return &authConfig, nil
}
func kubeconfigClientConfig(s *options.KubeletServer) (*restclient.Config, error) {
return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
&clientcmd.ClientConfigLoadingRules{ExplicitPath: s.KubeConfig.Value()},
&clientcmd.ConfigOverrides{ClusterInfo: clientcmdapi.Cluster{Server: s.APIServerList[0]}}).ClientConfig()
}
// createClientConfig creates a client configuration from the command line
// arguments. If either --auth-path or --kubeconfig is explicitly set, it
// will be used (setting both is an error). If neither are set first attempt
// to load the default kubeconfig file, then the default auth path file, and
// fall back to the default auth (none) without an error.
// TODO(roberthbailey): Remove support for --auth-path
func createClientConfig(s *options.KubeletServer) (*restclient.Config, error) {
if s.KubeConfig.Provided() && s.AuthPath.Provided() {
return nil, fmt.Errorf("cannot specify both --kubeconfig and --auth-path")
}
if s.KubeConfig.Provided() {
return kubeconfigClientConfig(s)
}
if s.AuthPath.Provided() {
return authPathClientConfig(s, false)
}
// Try the kubeconfig default first, falling back to the auth path default.
clientConfig, err := kubeconfigClientConfig(s)
if err != nil {
glog.Warningf("Could not load kubeconfig file %s: %v. Trying auth path instead.", s.KubeConfig, err)
return authPathClientConfig(s, true)
}
return clientConfig, nil
}
// CreateAPIServerClientConfig generates a client.Config from command line flags,
// including api-server-list, via createClientConfig and then injects chaos into
// the configuration via addChaosToClientConfig. This func is exported to support
// integration with third party kubelet extensions (e.g. kubernetes-mesos).
func CreateAPIServerClientConfig(s *options.KubeletServer) (*restclient.Config, error) {
if len(s.APIServerList) < 1 {
return nil, fmt.Errorf("no api servers specified")
}
// TODO: adapt Kube client to support LB over several servers
if len(s.APIServerList) > 1 {
glog.Infof("Multiple api servers specified. Picking first one")
}
clientConfig, err := createClientConfig(s)
if err != nil {
return nil, err
}
// Override kubeconfig qps/burst settings from flags
clientConfig.QPS = s.KubeAPIQPS
clientConfig.Burst = s.KubeAPIBurst
addChaosToClientConfig(s, clientConfig)
return clientConfig, nil
}
// 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))
}
}
}
// SimpleRunKubelet is a simple way to start a Kubelet talking to dockerEndpoint, using an API Client.
// Under the hood it calls RunKubelet (below)
func SimpleKubelet(client *clientset.Clientset,
dockerClient dockertools.DockerInterface,
hostname, rootDir, manifestURL, address string,
port uint,
readOnlyPort uint,
masterServiceNamespace string,
volumePlugins []volume.VolumePlugin,
tlsOptions *server.TLSOptions,
cadvisorInterface cadvisor.Interface,
configFilePath string,
cloud cloudprovider.Interface,
osInterface kubecontainer.OSInterface,
fileCheckFrequency, httpCheckFrequency, minimumGCAge, nodeStatusUpdateFrequency, syncFrequency, outOfDiskTransitionFrequency time.Duration,
maxPods int,
containerManager cm.ContainerManager, clusterDNS net.IP) *KubeletConfig {
imageGCPolicy := kubelet.ImageGCPolicy{
HighThresholdPercent: 90,
LowThresholdPercent: 80,
}
diskSpacePolicy := kubelet.DiskSpacePolicy{
DockerFreeDiskMB: 256,
RootFreeDiskMB: 256,
}
kcfg := KubeletConfig{
Address: net.ParseIP(address),
CAdvisorInterface: cadvisorInterface,
VolumeStatsAggPeriod: time.Minute,
CgroupRoot: "",
Cloud: cloud,
ClusterDNS: clusterDNS,
ConfigFile: configFilePath,
ContainerManager: containerManager,
ContainerRuntime: "docker",
CPUCFSQuota: true,
DiskSpacePolicy: diskSpacePolicy,
DockerClient: dockerClient,
RuntimeCgroups: "",
DockerExecHandler: &dockertools.NativeExecHandler{},
EnableCustomMetrics: false,
EnableDebuggingHandlers: true,
EnableServer: true,
FileCheckFrequency: fileCheckFrequency,
// Since this kubelet runs with --configure-cbr0=false, it needs to use
// hairpin-veth to allow hairpin packets. Note that this deviates from
// what the "real" kubelet currently does, because there's no way to
// set promiscuous mode on docker0.
HairpinMode: componentconfig.HairpinVeth,
HostnameOverride: hostname,
HTTPCheckFrequency: httpCheckFrequency,
ImageGCPolicy: imageGCPolicy,
KubeClient: client,
ManifestURL: manifestURL,
MasterServiceNamespace: masterServiceNamespace,
MaxContainerCount: 100,
MaxOpenFiles: 1024,
MaxPerPodContainerCount: 2,
MaxPods: maxPods,
MinimumGCAge: minimumGCAge,
Mounter: mount.New(),
NodeStatusUpdateFrequency: nodeStatusUpdateFrequency,
OOMAdjuster: oom.NewFakeOOMAdjuster(),
OSInterface: osInterface,
PodInfraContainerImage: kubetypes.PodInfraContainerImage,
Port: port,
ReadOnlyPort: readOnlyPort,
RegisterNode: true,
RegisterSchedulable: true,
RegistryBurst: 10,
RegistryPullQPS: 5.0,
ResolverConfig: kubetypes.ResolvConfDefault,
KubeletCgroups: "/kubelet",
RootDirectory: rootDir,
SerializeImagePulls: true,
SyncFrequency: syncFrequency,
SystemCgroups: "",
TLSOptions: tlsOptions,
VolumePlugins: volumePlugins,
Writer: &io.StdWriter{},
OutOfDiskTransitionFrequency: outOfDiskTransitionFrequency,
}
return &kcfg
}
// 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) 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.EventClient != nil {
glog.V(4).Infof("Sending events to api server.")
eventBroadcaster.StartRecordingToSink(&unversionedcore.EventSinkImpl{kcfg.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)
builder := kcfg.Builder
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.Info("Started kubelet as runonce")
} else {
startKubelet(k, podCfg, kcfg)
glog.Info("Started kubelet")
}
return nil
}
func startKubelet(k KubeletBootstrap, podCfg *config.PodConfig, kc *KubeletConfig) {
// start the kubelet
go wait.Until(func() { k.Run(podCfg.Updates()) }, 0, wait.NeverStop)
// start the kubelet server
if kc.EnableServer {
go wait.Until(func() {
k.ListenAndServe(kc.Address, kc.Port, kc.TLSOptions, kc.Auth, kc.EnableDebuggingHandlers)
}, 0, wait.NeverStop)
}
if kc.ReadOnlyPort > 0 {
go wait.Until(func() {
k.ListenAndServeReadOnly(kc.Address, kc.ReadOnlyPort)
}, 0, wait.NeverStop)
}
}
func makePodSourceConfig(kc *KubeletConfig) *config.PodConfig {
// source of all configuration
cfg := config.NewPodConfig(config.PodConfigNotificationIncremental, kc.Recorder)
// define file config source
if kc.ConfigFile != "" {
glog.Infof("Adding manifest file: %v", kc.ConfigFile)
config.NewSourceFile(kc.ConfigFile, kc.NodeName, kc.FileCheckFrequency, cfg.Channel(kubetypes.FileSource))
}
// define url config source
if kc.ManifestURL != "" {
glog.Infof("Adding manifest url %q with HTTP header %v", kc.ManifestURL, kc.ManifestURLHeader)
config.NewSourceURL(kc.ManifestURL, kc.ManifestURLHeader, kc.NodeName, kc.HTTPCheckFrequency, cfg.Channel(kubetypes.HTTPSource))
}
if kc.KubeClient != nil {
glog.Infof("Watching apiserver")
config.NewSourceApiserver(kc.KubeClient, kc.NodeName, cfg.Channel(kubetypes.ApiserverSource))
}
return cfg
}
// KubeletConfig is all of the parameters necessary for running a kubelet.
// TODO: This should probably be merged with KubeletServer. The extra object is a consequence of refactoring.
type KubeletConfig struct {
Address net.IP
AllowPrivileged bool
Auth server.AuthInterface
Builder KubeletBuilder
CAdvisorInterface cadvisor.Interface
VolumeStatsAggPeriod time.Duration
CgroupRoot string
Cloud cloudprovider.Interface
ClusterDNS net.IP
ClusterDomain string
ConfigFile string
ConfigureCBR0 bool
ContainerManager cm.ContainerManager
ContainerRuntime string
CPUCFSQuota bool
DiskSpacePolicy kubelet.DiskSpacePolicy
DockerClient dockertools.DockerInterface
RuntimeCgroups string
DockerExecHandler dockertools.ExecHandler
EnableCustomMetrics bool
EnableDebuggingHandlers bool
EnableServer bool
EventClient *clientset.Clientset
EventBurst int
EventRecordQPS float32
FileCheckFrequency time.Duration
Hostname string
HostnameOverride string
HostNetworkSources []string
HostPIDSources []string
HostIPCSources []string
HTTPCheckFrequency time.Duration
ImageGCPolicy kubelet.ImageGCPolicy
KubeClient *clientset.Clientset
ManifestURL string
ManifestURLHeader http.Header
MasterServiceNamespace string
MaxContainerCount int
MaxOpenFiles uint64
MaxPerPodContainerCount int
MaxPods int
MinimumGCAge time.Duration
Mounter mount.Interface
NetworkPluginName string
NetworkPlugins []network.NetworkPlugin
NodeName string
NodeLabels map[string]string
NodeStatusUpdateFrequency time.Duration
NonMasqueradeCIDR string
OOMAdjuster *oom.OOMAdjuster
OSInterface kubecontainer.OSInterface
PodCIDR string
ReconcileCIDR bool
PodConfig *config.PodConfig
PodInfraContainerImage string
Port uint
ReadOnlyPort uint
Recorder record.EventRecorder
RegisterNode bool
RegisterSchedulable bool
RegistryBurst int
RegistryPullQPS float64
Reservation kubetypes.Reservation
ResolverConfig string
KubeletCgroups string
RktPath string
RktStage1Image string
RootDirectory string
Runonce bool
SerializeImagePulls bool
StandaloneMode bool
StreamingConnectionIdleTimeout time.Duration
SyncFrequency time.Duration
SystemCgroups string
TLSOptions *server.TLSOptions
Writer io.Writer
VolumePlugins []volume.VolumePlugin
OutOfDiskTransitionFrequency time.Duration
ExperimentalFlannelOverlay bool
NodeIP net.IP
ContainerRuntimeOptions []kubecontainer.Option
HairpinMode string
BabysitDaemons bool
Options []kubelet.Option
}
func CreateAndInitKubelet(kc *KubeletConfig) (k KubeletBootstrap, pc *config.PodConfig, err error) {
// TODO: block until all sources have delivered at least one update to the channel, or break the sync loop
// up into "per source" synchronizations
// TODO: KubeletConfig.KubeClient should be a client interface, but client interface misses certain methods
// used by kubelet. Since NewMainKubelet expects a client interface, we need to make sure we are not passing
// a nil pointer to it when what we really want is a nil interface.
var kubeClient clientset.Interface
if kc.KubeClient != nil {
kubeClient = kc.KubeClient
// TODO: remove this when we've refactored kubelet to only use clientset.
}
gcPolicy := kubecontainer.ContainerGCPolicy{
MinAge: kc.MinimumGCAge,
MaxPerPodContainer: kc.MaxPerPodContainerCount,
MaxContainers: kc.MaxContainerCount,
}
daemonEndpoints := &api.NodeDaemonEndpoints{
KubeletEndpoint: api.DaemonEndpoint{Port: int(kc.Port)},
}
pc = kc.PodConfig
if pc == nil {
pc = makePodSourceConfig(kc)
}
k, err = kubelet.NewMainKubelet(
kc.Hostname,
kc.NodeName,
kc.DockerClient,
kubeClient,
kc.RootDirectory,
kc.PodInfraContainerImage,
kc.SyncFrequency,
float32(kc.RegistryPullQPS),
kc.RegistryBurst,
kc.EventRecordQPS,
kc.EventBurst,
gcPolicy,
pc.SeenAllSources,
kc.RegisterNode,
kc.RegisterSchedulable,
kc.StandaloneMode,
kc.ClusterDomain,
kc.ClusterDNS,
kc.MasterServiceNamespace,
kc.VolumePlugins,
kc.NetworkPlugins,
kc.NetworkPluginName,
kc.StreamingConnectionIdleTimeout,
kc.Recorder,
kc.CAdvisorInterface,
kc.ImageGCPolicy,
kc.DiskSpacePolicy,
kc.Cloud,
kc.NodeLabels,
kc.NodeStatusUpdateFrequency,
kc.OSInterface,
kc.CgroupRoot,
kc.ContainerRuntime,
kc.RktPath,
kc.RktStage1Image,
kc.Mounter,
kc.Writer,
kc.ConfigureCBR0,
kc.NonMasqueradeCIDR,
kc.PodCIDR,
kc.ReconcileCIDR,
kc.MaxPods,
kc.DockerExecHandler,
kc.ResolverConfig,
kc.CPUCFSQuota,
daemonEndpoints,
kc.OOMAdjuster,
kc.SerializeImagePulls,
kc.ContainerManager,
kc.OutOfDiskTransitionFrequency,
kc.ExperimentalFlannelOverlay,
kc.NodeIP,
kc.Reservation,
kc.EnableCustomMetrics,
kc.VolumeStatsAggPeriod,
kc.ContainerRuntimeOptions,
kc.HairpinMode,
kc.BabysitDaemons,
kc.Options,
)
if err != nil {
return nil, nil, err
}
k.BirthCry()
k.StartGarbageCollection()
return k, pc, nil
}
func parseReservation(kubeReserved, systemReserved util.ConfigurationMap) (*kubetypes.Reservation, error) {
reservation := new(kubetypes.Reservation)
if rl, err := parseResourceList(kubeReserved); err != nil {
return nil, err
} else {
reservation.Kubernetes = rl
}
if rl, err := parseResourceList(systemReserved); err != nil {
return nil, err
} else {
reservation.System = rl
}
return reservation, nil
}
func parseResourceList(m util.ConfigurationMap) (api.ResourceList, error) {
rl := make(api.ResourceList)
for k, v := range m {
switch api.ResourceName(k) {
// Only CPU and memory resources are supported.
case api.ResourceCPU, api.ResourceMemory:
q, err := resource.ParseQuantity(v)
if err != nil {
return nil, err
}
rl[api.ResourceName(k)] = *q
default:
return nil, fmt.Errorf("cannot reserve %q resource", k)
}
}
return rl, nil
}