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kubelet.go
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kubelet.go
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/*
Copyright 2015 The Kubernetes Authors.
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 kubelet
import (
"context"
"crypto/tls"
"errors"
"fmt"
"math"
"net"
"net/http"
"os"
"path/filepath"
sysruntime "runtime"
"sort"
"sync"
"sync/atomic"
"time"
cadvisorapi "github.com/google/cadvisor/info/v1"
"github.com/google/go-cmp/cmp"
"github.com/opencontainers/selinux/go-selinux"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
"go.opentelemetry.io/otel/trace"
"k8s.io/client-go/informers"
"k8s.io/mount-utils"
netutils "k8s.io/utils/net"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/wait"
utilfeature "k8s.io/apiserver/pkg/util/feature"
clientset "k8s.io/client-go/kubernetes"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/certificate"
"k8s.io/client-go/util/flowcontrol"
cloudprovider "k8s.io/cloud-provider"
"k8s.io/component-helpers/apimachinery/lease"
internalapi "k8s.io/cri-api/pkg/apis"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
remote "k8s.io/cri-client/pkg"
"k8s.io/klog/v2"
pluginwatcherapi "k8s.io/kubelet/pkg/apis/pluginregistration/v1"
statsapi "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
"k8s.io/kubernetes/pkg/api/v1/resource"
"k8s.io/kubernetes/pkg/features"
kubeletconfiginternal "k8s.io/kubernetes/pkg/kubelet/apis/config"
"k8s.io/kubernetes/pkg/kubelet/apis/podresources"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
kubeletcertificate "k8s.io/kubernetes/pkg/kubelet/certificate"
"k8s.io/kubernetes/pkg/kubelet/cloudresource"
"k8s.io/kubernetes/pkg/kubelet/clustertrustbundle"
"k8s.io/kubernetes/pkg/kubelet/cm"
draplugin "k8s.io/kubernetes/pkg/kubelet/cm/dra/plugin"
"k8s.io/kubernetes/pkg/kubelet/config"
"k8s.io/kubernetes/pkg/kubelet/configmap"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/events"
"k8s.io/kubernetes/pkg/kubelet/eviction"
"k8s.io/kubernetes/pkg/kubelet/images"
"k8s.io/kubernetes/pkg/kubelet/kuberuntime"
"k8s.io/kubernetes/pkg/kubelet/lifecycle"
"k8s.io/kubernetes/pkg/kubelet/logs"
"k8s.io/kubernetes/pkg/kubelet/metrics"
"k8s.io/kubernetes/pkg/kubelet/metrics/collectors"
"k8s.io/kubernetes/pkg/kubelet/network/dns"
"k8s.io/kubernetes/pkg/kubelet/nodeshutdown"
oomwatcher "k8s.io/kubernetes/pkg/kubelet/oom"
"k8s.io/kubernetes/pkg/kubelet/pleg"
"k8s.io/kubernetes/pkg/kubelet/pluginmanager"
plugincache "k8s.io/kubernetes/pkg/kubelet/pluginmanager/cache"
kubepod "k8s.io/kubernetes/pkg/kubelet/pod"
"k8s.io/kubernetes/pkg/kubelet/preemption"
"k8s.io/kubernetes/pkg/kubelet/prober"
proberesults "k8s.io/kubernetes/pkg/kubelet/prober/results"
"k8s.io/kubernetes/pkg/kubelet/runtimeclass"
"k8s.io/kubernetes/pkg/kubelet/secret"
"k8s.io/kubernetes/pkg/kubelet/server"
servermetrics "k8s.io/kubernetes/pkg/kubelet/server/metrics"
serverstats "k8s.io/kubernetes/pkg/kubelet/server/stats"
"k8s.io/kubernetes/pkg/kubelet/stats"
"k8s.io/kubernetes/pkg/kubelet/status"
"k8s.io/kubernetes/pkg/kubelet/sysctl"
"k8s.io/kubernetes/pkg/kubelet/token"
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/kubelet/userns"
"k8s.io/kubernetes/pkg/kubelet/userns/inuserns"
"k8s.io/kubernetes/pkg/kubelet/util"
"k8s.io/kubernetes/pkg/kubelet/util/manager"
"k8s.io/kubernetes/pkg/kubelet/util/queue"
"k8s.io/kubernetes/pkg/kubelet/util/sliceutils"
"k8s.io/kubernetes/pkg/kubelet/volumemanager"
httpprobe "k8s.io/kubernetes/pkg/probe/http"
"k8s.io/kubernetes/pkg/security/apparmor"
"k8s.io/kubernetes/pkg/util/oom"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/csi"
"k8s.io/kubernetes/pkg/volume/util/hostutil"
"k8s.io/kubernetes/pkg/volume/util/subpath"
"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
"k8s.io/utils/clock"
)
const (
// Max amount of time to wait for the container runtime to come up.
maxWaitForContainerRuntime = 30 * time.Second
// nodeStatusUpdateRetry specifies how many times kubelet retries when posting node status failed.
nodeStatusUpdateRetry = 5
// nodeReadyGracePeriod is the period to allow for before fast status update is
// terminated and container runtime not being ready is logged without verbosity guard.
nodeReadyGracePeriod = 120 * time.Second
// DefaultContainerLogsDir is the location of container logs.
DefaultContainerLogsDir = "/var/log/containers"
// MaxContainerBackOff is the max backoff period, exported for the e2e test
MaxContainerBackOff = 300 * time.Second
// Period for performing global cleanup tasks.
housekeepingPeriod = time.Second * 2
// Duration at which housekeeping failed to satisfy the invariant that
// housekeeping should be fast to avoid blocking pod config (while
// housekeeping is running no new pods are started or deleted).
housekeepingWarningDuration = time.Second * 1
// Period after which the runtime cache expires - set to slightly longer than
// the expected length between housekeeping periods, which explicitly refreshes
// the cache.
runtimeCacheRefreshPeriod = housekeepingPeriod + housekeepingWarningDuration
// Period for performing eviction monitoring.
// ensure this is kept in sync with internal cadvisor housekeeping.
evictionMonitoringPeriod = time.Second * 10
// The path in containers' filesystems where the hosts file is mounted.
linuxEtcHostsPath = "/etc/hosts"
windowsEtcHostsPath = "C:\\Windows\\System32\\drivers\\etc\\hosts"
// Capacity of the channel for receiving pod lifecycle events. This number
// is a bit arbitrary and may be adjusted in the future.
plegChannelCapacity = 1000
// Generic PLEG relies on relisting for discovering container events.
// A longer period means that kubelet will take longer to detect container
// changes and to update pod status. On the other hand, a shorter period
// will cause more frequent relisting (e.g., container runtime operations),
// leading to higher cpu usage.
// Note that even though we set the period to 1s, the relisting itself can
// take more than 1s to finish if the container runtime responds slowly
// and/or when there are many container changes in one cycle.
genericPlegRelistPeriod = time.Second * 1
genericPlegRelistThreshold = time.Minute * 3
// Generic PLEG relist period and threshold when used with Evented PLEG.
eventedPlegRelistPeriod = time.Second * 300
eventedPlegRelistThreshold = time.Minute * 10
eventedPlegMaxStreamRetries = 5
// backOffPeriod is the period to back off when pod syncing results in an
// error. It is also used as the base period for the exponential backoff
// container restarts and image pulls.
backOffPeriod = time.Second * 10
// ContainerGCPeriod is the period for performing container garbage collection.
ContainerGCPeriod = time.Minute
// ImageGCPeriod is the period for performing image garbage collection.
ImageGCPeriod = 5 * time.Minute
// Minimum number of dead containers to keep in a pod
minDeadContainerInPod = 1
// nodeLeaseRenewIntervalFraction is the fraction of lease duration to renew the lease
nodeLeaseRenewIntervalFraction = 0.25
// instrumentationScope is the name of OpenTelemetry instrumentation scope
instrumentationScope = "k8s.io/kubernetes/pkg/kubelet"
)
var (
// ContainerLogsDir can be overwritten for testing usage
ContainerLogsDir = DefaultContainerLogsDir
etcHostsPath = getContainerEtcHostsPath()
)
func getContainerEtcHostsPath() string {
if sysruntime.GOOS == "windows" {
return windowsEtcHostsPath
}
return linuxEtcHostsPath
}
// SyncHandler is an interface implemented by Kubelet, for testability
type SyncHandler interface {
HandlePodAdditions(pods []*v1.Pod)
HandlePodUpdates(pods []*v1.Pod)
HandlePodRemoves(pods []*v1.Pod)
HandlePodReconcile(pods []*v1.Pod)
HandlePodSyncs(pods []*v1.Pod)
HandlePodCleanups(ctx context.Context) error
}
// Option is a functional option type for Kubelet
type Option func(*Kubelet)
// Bootstrap is a bootstrapping interface for kubelet, targets the initialization protocol
type Bootstrap interface {
GetConfiguration() kubeletconfiginternal.KubeletConfiguration
BirthCry()
StartGarbageCollection()
ListenAndServe(kubeCfg *kubeletconfiginternal.KubeletConfiguration, tlsOptions *server.TLSOptions, auth server.AuthInterface, tp trace.TracerProvider)
ListenAndServeReadOnly(address net.IP, port uint, tp trace.TracerProvider)
ListenAndServePodResources()
Run(<-chan kubetypes.PodUpdate)
RunOnce(<-chan kubetypes.PodUpdate) ([]RunPodResult, error)
}
// Dependencies is a bin for things we might consider "injected dependencies" -- objects constructed
// at runtime that are necessary for running the Kubelet. This is a temporary solution for grouping
// these objects while we figure out a more comprehensive dependency injection story for the Kubelet.
type Dependencies struct {
Options []Option
// Injected Dependencies
Auth server.AuthInterface
CAdvisorInterface cadvisor.Interface
Cloud cloudprovider.Interface
ContainerManager cm.ContainerManager
EventClient v1core.EventsGetter
HeartbeatClient clientset.Interface
OnHeartbeatFailure func()
KubeClient clientset.Interface
Mounter mount.Interface
HostUtil hostutil.HostUtils
OOMAdjuster *oom.OOMAdjuster
OSInterface kubecontainer.OSInterface
PodConfig *config.PodConfig
ProbeManager prober.Manager
Recorder record.EventRecorder
Subpather subpath.Interface
TracerProvider trace.TracerProvider
VolumePlugins []volume.VolumePlugin
DynamicPluginProber volume.DynamicPluginProber
TLSOptions *server.TLSOptions
RemoteRuntimeService internalapi.RuntimeService
RemoteImageService internalapi.ImageManagerService
PodStartupLatencyTracker util.PodStartupLatencyTracker
NodeStartupLatencyTracker util.NodeStartupLatencyTracker
// remove it after cadvisor.UsingLegacyCadvisorStats dropped.
useLegacyCadvisorStats bool
}
// makePodSourceConfig creates a config.PodConfig from the given
// KubeletConfiguration or returns an error.
func makePodSourceConfig(kubeCfg *kubeletconfiginternal.KubeletConfiguration, kubeDeps *Dependencies, nodeName types.NodeName, nodeHasSynced func() bool) (*config.PodConfig, error) {
manifestURLHeader := make(http.Header)
if len(kubeCfg.StaticPodURLHeader) > 0 {
for k, v := range kubeCfg.StaticPodURLHeader {
for i := range v {
manifestURLHeader.Add(k, v[i])
}
}
}
// source of all configuration
cfg := config.NewPodConfig(config.PodConfigNotificationIncremental, kubeDeps.Recorder, kubeDeps.PodStartupLatencyTracker)
// TODO: it needs to be replaced by a proper context in the future
ctx := context.TODO()
// define file config source
if kubeCfg.StaticPodPath != "" {
klog.InfoS("Adding static pod path", "path", kubeCfg.StaticPodPath)
config.NewSourceFile(kubeCfg.StaticPodPath, nodeName, kubeCfg.FileCheckFrequency.Duration, cfg.Channel(ctx, kubetypes.FileSource))
}
// define url config source
if kubeCfg.StaticPodURL != "" {
klog.InfoS("Adding pod URL with HTTP header", "URL", kubeCfg.StaticPodURL, "header", manifestURLHeader)
config.NewSourceURL(kubeCfg.StaticPodURL, manifestURLHeader, nodeName, kubeCfg.HTTPCheckFrequency.Duration, cfg.Channel(ctx, kubetypes.HTTPSource))
}
if kubeDeps.KubeClient != nil {
klog.InfoS("Adding apiserver pod source")
config.NewSourceApiserver(kubeDeps.KubeClient, nodeName, nodeHasSynced, cfg.Channel(ctx, kubetypes.ApiserverSource))
}
return cfg, nil
}
// PreInitRuntimeService will init runtime service before RunKubelet.
func PreInitRuntimeService(kubeCfg *kubeletconfiginternal.KubeletConfiguration, kubeDeps *Dependencies) error {
remoteImageEndpoint := kubeCfg.ImageServiceEndpoint
if remoteImageEndpoint == "" && kubeCfg.ContainerRuntimeEndpoint != "" {
remoteImageEndpoint = kubeCfg.ContainerRuntimeEndpoint
}
var err error
var tp trace.TracerProvider
if utilfeature.DefaultFeatureGate.Enabled(features.KubeletTracing) {
tp = kubeDeps.TracerProvider
}
logger := klog.Background()
if kubeDeps.RemoteRuntimeService, err = remote.NewRemoteRuntimeService(kubeCfg.ContainerRuntimeEndpoint, kubeCfg.RuntimeRequestTimeout.Duration, tp, &logger); err != nil {
return err
}
if kubeDeps.RemoteImageService, err = remote.NewRemoteImageService(remoteImageEndpoint, kubeCfg.RuntimeRequestTimeout.Duration, tp, &logger); err != nil {
return err
}
kubeDeps.useLegacyCadvisorStats = cadvisor.UsingLegacyCadvisorStats(kubeCfg.ContainerRuntimeEndpoint)
return nil
}
// NewMainKubelet instantiates a new Kubelet object along with all the required internal modules.
// No initialization of Kubelet and its modules should happen here.
func NewMainKubelet(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
kubeDeps *Dependencies,
crOptions *config.ContainerRuntimeOptions,
hostname string,
hostnameOverridden bool,
nodeName types.NodeName,
nodeIPs []net.IP,
providerID string,
cloudProvider string,
certDirectory string,
rootDirectory string,
podLogsDirectory string,
imageCredentialProviderConfigFile string,
imageCredentialProviderBinDir string,
registerNode bool,
registerWithTaints []v1.Taint,
allowedUnsafeSysctls []string,
experimentalMounterPath string,
kernelMemcgNotification bool,
experimentalNodeAllocatableIgnoreEvictionThreshold bool,
minimumGCAge metav1.Duration,
maxPerPodContainerCount int32,
maxContainerCount int32,
registerSchedulable bool,
nodeLabels map[string]string,
nodeStatusMaxImages int32,
seccompDefault bool,
) (*Kubelet, error) {
ctx := context.Background()
logger := klog.TODO()
if rootDirectory == "" {
return nil, fmt.Errorf("invalid root directory %q", rootDirectory)
}
if podLogsDirectory == "" {
return nil, errors.New("pod logs root directory is empty")
}
if kubeCfg.SyncFrequency.Duration <= 0 {
return nil, fmt.Errorf("invalid sync frequency %d", kubeCfg.SyncFrequency.Duration)
}
if utilfeature.DefaultFeatureGate.Enabled(features.DisableCloudProviders) && cloudprovider.IsDeprecatedInternal(cloudProvider) {
cloudprovider.DisableWarningForProvider(cloudProvider)
return nil, fmt.Errorf("cloud provider %q was specified, but built-in cloud providers are disabled. Please set --cloud-provider=external and migrate to an external cloud provider", cloudProvider)
}
var nodeHasSynced cache.InformerSynced
var nodeLister corelisters.NodeLister
// If kubeClient == nil, we are running in standalone mode (i.e. no API servers)
// If not nil, we are running as part of a cluster and should sync w/API
if kubeDeps.KubeClient != nil {
kubeInformers := informers.NewSharedInformerFactoryWithOptions(kubeDeps.KubeClient, 0, informers.WithTweakListOptions(func(options *metav1.ListOptions) {
options.FieldSelector = fields.Set{metav1.ObjectNameField: string(nodeName)}.String()
}))
nodeLister = kubeInformers.Core().V1().Nodes().Lister()
nodeHasSynced = func() bool {
return kubeInformers.Core().V1().Nodes().Informer().HasSynced()
}
kubeInformers.Start(wait.NeverStop)
klog.InfoS("Attempting to sync node with API server")
} else {
// we don't have a client to sync!
nodeIndexer := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{})
nodeLister = corelisters.NewNodeLister(nodeIndexer)
nodeHasSynced = func() bool { return true }
klog.InfoS("Kubelet is running in standalone mode, will skip API server sync")
}
if kubeDeps.PodConfig == nil {
var err error
kubeDeps.PodConfig, err = makePodSourceConfig(kubeCfg, kubeDeps, nodeName, nodeHasSynced)
if err != nil {
return nil, err
}
}
containerGCPolicy := kubecontainer.GCPolicy{
MinAge: minimumGCAge.Duration,
MaxPerPodContainer: int(maxPerPodContainerCount),
MaxContainers: int(maxContainerCount),
}
daemonEndpoints := &v1.NodeDaemonEndpoints{
KubeletEndpoint: v1.DaemonEndpoint{Port: kubeCfg.Port},
}
imageGCPolicy := images.ImageGCPolicy{
MinAge: kubeCfg.ImageMinimumGCAge.Duration,
HighThresholdPercent: int(kubeCfg.ImageGCHighThresholdPercent),
LowThresholdPercent: int(kubeCfg.ImageGCLowThresholdPercent),
}
if utilfeature.DefaultFeatureGate.Enabled(features.ImageMaximumGCAge) {
imageGCPolicy.MaxAge = kubeCfg.ImageMaximumGCAge.Duration
} else if kubeCfg.ImageMaximumGCAge.Duration != 0 {
klog.InfoS("ImageMaximumGCAge flag enabled, but corresponding feature gate is not enabled. Ignoring flag.")
}
enforceNodeAllocatable := kubeCfg.EnforceNodeAllocatable
if experimentalNodeAllocatableIgnoreEvictionThreshold {
// Do not provide kubeCfg.EnforceNodeAllocatable to eviction threshold parsing if we are not enforcing Evictions
enforceNodeAllocatable = []string{}
}
thresholds, err := eviction.ParseThresholdConfig(enforceNodeAllocatable, kubeCfg.EvictionHard, kubeCfg.EvictionSoft, kubeCfg.EvictionSoftGracePeriod, kubeCfg.EvictionMinimumReclaim)
if err != nil {
return nil, err
}
evictionConfig := eviction.Config{
PressureTransitionPeriod: kubeCfg.EvictionPressureTransitionPeriod.Duration,
MaxPodGracePeriodSeconds: int64(kubeCfg.EvictionMaxPodGracePeriod),
Thresholds: thresholds,
KernelMemcgNotification: kernelMemcgNotification,
PodCgroupRoot: kubeDeps.ContainerManager.GetPodCgroupRoot(),
}
var serviceLister corelisters.ServiceLister
var serviceHasSynced cache.InformerSynced
if kubeDeps.KubeClient != nil {
// don't watch headless services, they are not needed since this informer is only used to create the environment variables for pods.
// See https://issues.k8s.io/122394
kubeInformers := informers.NewSharedInformerFactoryWithOptions(kubeDeps.KubeClient, 0, informers.WithTweakListOptions(func(options *metav1.ListOptions) {
options.FieldSelector = fields.OneTermNotEqualSelector("spec.clusterIP", v1.ClusterIPNone).String()
}))
serviceLister = kubeInformers.Core().V1().Services().Lister()
serviceHasSynced = kubeInformers.Core().V1().Services().Informer().HasSynced
kubeInformers.Start(wait.NeverStop)
} else {
serviceIndexer := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
serviceLister = corelisters.NewServiceLister(serviceIndexer)
serviceHasSynced = func() bool { return true }
}
// construct a node reference used for events
nodeRef := &v1.ObjectReference{
Kind: "Node",
Name: string(nodeName),
UID: types.UID(nodeName),
Namespace: "",
}
oomWatcher, err := oomwatcher.NewWatcher(kubeDeps.Recorder)
if err != nil {
if inuserns.RunningInUserNS() {
if utilfeature.DefaultFeatureGate.Enabled(features.KubeletInUserNamespace) {
// oomwatcher.NewWatcher returns "open /dev/kmsg: operation not permitted" error,
// when running in a user namespace with sysctl value `kernel.dmesg_restrict=1`.
klog.V(2).InfoS("Failed to create an oomWatcher (running in UserNS, ignoring)", "err", err)
oomWatcher = nil
} else {
klog.ErrorS(err, "Failed to create an oomWatcher (running in UserNS, Hint: enable KubeletInUserNamespace feature flag to ignore the error)")
return nil, err
}
} else {
return nil, err
}
}
clusterDNS := make([]net.IP, 0, len(kubeCfg.ClusterDNS))
for _, ipEntry := range kubeCfg.ClusterDNS {
ip := netutils.ParseIPSloppy(ipEntry)
if ip == nil {
klog.InfoS("Invalid clusterDNS IP", "IP", ipEntry)
} else {
clusterDNS = append(clusterDNS, ip)
}
}
// A TLS transport is needed to make HTTPS-based container lifecycle requests,
// but we do not have the information necessary to do TLS verification.
//
// This client must not be modified to include credentials, because it is
// critical that credentials not leak from the client to arbitrary hosts.
insecureContainerLifecycleHTTPClient := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
},
CheckRedirect: httpprobe.RedirectChecker(false),
}
tracer := kubeDeps.TracerProvider.Tracer(instrumentationScope)
klet := &Kubelet{
hostname: hostname,
hostnameOverridden: hostnameOverridden,
nodeName: nodeName,
kubeClient: kubeDeps.KubeClient,
heartbeatClient: kubeDeps.HeartbeatClient,
onRepeatedHeartbeatFailure: kubeDeps.OnHeartbeatFailure,
rootDirectory: filepath.Clean(rootDirectory),
podLogsDirectory: podLogsDirectory,
resyncInterval: kubeCfg.SyncFrequency.Duration,
sourcesReady: config.NewSourcesReady(kubeDeps.PodConfig.SeenAllSources),
registerNode: registerNode,
registerWithTaints: registerWithTaints,
registerSchedulable: registerSchedulable,
dnsConfigurer: dns.NewConfigurer(kubeDeps.Recorder, nodeRef, nodeIPs, clusterDNS, kubeCfg.ClusterDomain, kubeCfg.ResolverConfig),
serviceLister: serviceLister,
serviceHasSynced: serviceHasSynced,
nodeLister: nodeLister,
nodeHasSynced: nodeHasSynced,
streamingConnectionIdleTimeout: kubeCfg.StreamingConnectionIdleTimeout.Duration,
recorder: kubeDeps.Recorder,
cadvisor: kubeDeps.CAdvisorInterface,
cloud: kubeDeps.Cloud,
externalCloudProvider: cloudprovider.IsExternal(cloudProvider),
providerID: providerID,
nodeRef: nodeRef,
nodeLabels: nodeLabels,
nodeStatusUpdateFrequency: kubeCfg.NodeStatusUpdateFrequency.Duration,
nodeStatusReportFrequency: kubeCfg.NodeStatusReportFrequency.Duration,
os: kubeDeps.OSInterface,
oomWatcher: oomWatcher,
cgroupsPerQOS: kubeCfg.CgroupsPerQOS,
cgroupRoot: kubeCfg.CgroupRoot,
mounter: kubeDeps.Mounter,
hostutil: kubeDeps.HostUtil,
subpather: kubeDeps.Subpather,
maxPods: int(kubeCfg.MaxPods),
podsPerCore: int(kubeCfg.PodsPerCore),
syncLoopMonitor: atomic.Value{},
daemonEndpoints: daemonEndpoints,
containerManager: kubeDeps.ContainerManager,
nodeIPs: nodeIPs,
nodeIPValidator: validateNodeIP,
clock: clock.RealClock{},
enableControllerAttachDetach: kubeCfg.EnableControllerAttachDetach,
makeIPTablesUtilChains: kubeCfg.MakeIPTablesUtilChains,
nodeStatusMaxImages: nodeStatusMaxImages,
tracer: tracer,
nodeStartupLatencyTracker: kubeDeps.NodeStartupLatencyTracker,
}
if klet.cloud != nil {
klet.cloudResourceSyncManager = cloudresource.NewSyncManager(klet.cloud, nodeName, klet.nodeStatusUpdateFrequency)
}
var secretManager secret.Manager
var configMapManager configmap.Manager
if klet.kubeClient != nil {
switch kubeCfg.ConfigMapAndSecretChangeDetectionStrategy {
case kubeletconfiginternal.WatchChangeDetectionStrategy:
secretManager = secret.NewWatchingSecretManager(klet.kubeClient, klet.resyncInterval)
configMapManager = configmap.NewWatchingConfigMapManager(klet.kubeClient, klet.resyncInterval)
case kubeletconfiginternal.TTLCacheChangeDetectionStrategy:
secretManager = secret.NewCachingSecretManager(
klet.kubeClient, manager.GetObjectTTLFromNodeFunc(klet.GetNode))
configMapManager = configmap.NewCachingConfigMapManager(
klet.kubeClient, manager.GetObjectTTLFromNodeFunc(klet.GetNode))
case kubeletconfiginternal.GetChangeDetectionStrategy:
secretManager = secret.NewSimpleSecretManager(klet.kubeClient)
configMapManager = configmap.NewSimpleConfigMapManager(klet.kubeClient)
default:
return nil, fmt.Errorf("unknown configmap and secret manager mode: %v", kubeCfg.ConfigMapAndSecretChangeDetectionStrategy)
}
klet.secretManager = secretManager
klet.configMapManager = configMapManager
}
machineInfo, err := klet.cadvisor.MachineInfo()
if err != nil {
return nil, err
}
// Avoid collector collects it as a timestamped metric
// See PR #95210 and #97006 for more details.
machineInfo.Timestamp = time.Time{}
klet.setCachedMachineInfo(machineInfo)
imageBackOff := flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
klet.livenessManager = proberesults.NewManager()
klet.readinessManager = proberesults.NewManager()
klet.startupManager = proberesults.NewManager()
klet.podCache = kubecontainer.NewCache()
klet.mirrorPodClient = kubepod.NewBasicMirrorClient(klet.kubeClient, string(nodeName), nodeLister)
klet.podManager = kubepod.NewBasicPodManager()
klet.statusManager = status.NewManager(klet.kubeClient, klet.podManager, klet, kubeDeps.PodStartupLatencyTracker, klet.getRootDir())
klet.resourceAnalyzer = serverstats.NewResourceAnalyzer(klet, kubeCfg.VolumeStatsAggPeriod.Duration, kubeDeps.Recorder)
klet.runtimeService = kubeDeps.RemoteRuntimeService
if kubeDeps.KubeClient != nil {
klet.runtimeClassManager = runtimeclass.NewManager(kubeDeps.KubeClient)
}
// setup containerLogManager for CRI container runtime
containerLogManager, err := logs.NewContainerLogManager(
klet.runtimeService,
kubeDeps.OSInterface,
kubeCfg.ContainerLogMaxSize,
int(kubeCfg.ContainerLogMaxFiles),
int(kubeCfg.ContainerLogMaxWorkers),
kubeCfg.ContainerLogMonitorInterval,
)
if err != nil {
return nil, fmt.Errorf("failed to initialize container log manager: %v", err)
}
klet.containerLogManager = containerLogManager
klet.reasonCache = NewReasonCache()
klet.workQueue = queue.NewBasicWorkQueue(klet.clock)
klet.podWorkers = newPodWorkers(
klet,
kubeDeps.Recorder,
klet.workQueue,
klet.resyncInterval,
backOffPeriod,
klet.podCache,
)
runtime, err := kuberuntime.NewKubeGenericRuntimeManager(
kubecontainer.FilterEventRecorder(kubeDeps.Recorder),
klet.livenessManager,
klet.readinessManager,
klet.startupManager,
rootDirectory,
podLogsDirectory,
machineInfo,
klet.podWorkers,
kubeDeps.OSInterface,
klet,
insecureContainerLifecycleHTTPClient,
imageBackOff,
kubeCfg.SerializeImagePulls,
kubeCfg.MaxParallelImagePulls,
float32(kubeCfg.RegistryPullQPS),
int(kubeCfg.RegistryBurst),
imageCredentialProviderConfigFile,
imageCredentialProviderBinDir,
kubeCfg.CPUCFSQuota,
kubeCfg.CPUCFSQuotaPeriod,
kubeDeps.RemoteRuntimeService,
kubeDeps.RemoteImageService,
kubeDeps.ContainerManager,
klet.containerLogManager,
klet.runtimeClassManager,
seccompDefault,
kubeCfg.MemorySwap.SwapBehavior,
kubeDeps.ContainerManager.GetNodeAllocatableAbsolute,
*kubeCfg.MemoryThrottlingFactor,
kubeDeps.PodStartupLatencyTracker,
kubeDeps.TracerProvider,
)
if err != nil {
return nil, err
}
klet.containerRuntime = runtime
klet.streamingRuntime = runtime
klet.runner = runtime
runtimeCache, err := kubecontainer.NewRuntimeCache(klet.containerRuntime, runtimeCacheRefreshPeriod)
if err != nil {
return nil, err
}
klet.runtimeCache = runtimeCache
// common provider to get host file system usage associated with a pod managed by kubelet
hostStatsProvider := stats.NewHostStatsProvider(kubecontainer.RealOS{}, func(podUID types.UID) string {
return getEtcHostsPath(klet.getPodDir(podUID))
}, podLogsDirectory)
if kubeDeps.useLegacyCadvisorStats {
klet.StatsProvider = stats.NewCadvisorStatsProvider(
klet.cadvisor,
klet.resourceAnalyzer,
klet.podManager,
klet.runtimeCache,
klet.containerRuntime,
klet.statusManager,
hostStatsProvider)
} else {
klet.StatsProvider = stats.NewCRIStatsProvider(
klet.cadvisor,
klet.resourceAnalyzer,
klet.podManager,
klet.runtimeCache,
kubeDeps.RemoteRuntimeService,
kubeDeps.RemoteImageService,
hostStatsProvider,
utilfeature.DefaultFeatureGate.Enabled(features.PodAndContainerStatsFromCRI))
}
eventChannel := make(chan *pleg.PodLifecycleEvent, plegChannelCapacity)
if utilfeature.DefaultFeatureGate.Enabled(features.EventedPLEG) {
// adjust Generic PLEG relisting period and threshold to higher value when Evented PLEG is turned on
genericRelistDuration := &pleg.RelistDuration{
RelistPeriod: eventedPlegRelistPeriod,
RelistThreshold: eventedPlegRelistThreshold,
}
klet.pleg = pleg.NewGenericPLEG(klet.containerRuntime, eventChannel, genericRelistDuration, klet.podCache, clock.RealClock{})
// In case Evented PLEG has to fall back on Generic PLEG due to an error,
// Evented PLEG should be able to reset the Generic PLEG relisting duration
// to the default value.
eventedRelistDuration := &pleg.RelistDuration{
RelistPeriod: genericPlegRelistPeriod,
RelistThreshold: genericPlegRelistThreshold,
}
klet.eventedPleg, err = pleg.NewEventedPLEG(klet.containerRuntime, klet.runtimeService, eventChannel,
klet.podCache, klet.pleg, eventedPlegMaxStreamRetries, eventedRelistDuration, clock.RealClock{})
if err != nil {
return nil, err
}
} else {
genericRelistDuration := &pleg.RelistDuration{
RelistPeriod: genericPlegRelistPeriod,
RelistThreshold: genericPlegRelistThreshold,
}
klet.pleg = pleg.NewGenericPLEG(klet.containerRuntime, eventChannel, genericRelistDuration, klet.podCache, clock.RealClock{})
}
klet.runtimeState = newRuntimeState(maxWaitForContainerRuntime)
klet.runtimeState.addHealthCheck("PLEG", klet.pleg.Healthy)
if utilfeature.DefaultFeatureGate.Enabled(features.EventedPLEG) {
klet.runtimeState.addHealthCheck("EventedPLEG", klet.eventedPleg.Healthy)
}
if _, err := klet.updatePodCIDR(ctx, kubeCfg.PodCIDR); err != nil {
klog.ErrorS(err, "Pod CIDR update failed")
}
// setup containerGC
containerGC, err := kubecontainer.NewContainerGC(klet.containerRuntime, containerGCPolicy, klet.sourcesReady)
if err != nil {
return nil, err
}
klet.containerGC = containerGC
klet.containerDeletor = newPodContainerDeletor(klet.containerRuntime, max(containerGCPolicy.MaxPerPodContainer, minDeadContainerInPod))
// setup imageManager
imageManager, err := images.NewImageGCManager(klet.containerRuntime, klet.StatsProvider, kubeDeps.Recorder, nodeRef, imageGCPolicy, kubeDeps.TracerProvider)
if err != nil {
return nil, fmt.Errorf("failed to initialize image manager: %v", err)
}
klet.imageManager = imageManager
if kubeDeps.TLSOptions != nil {
if kubeCfg.ServerTLSBootstrap && utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletServerCertificate) {
klet.serverCertificateManager, err = kubeletcertificate.NewKubeletServerCertificateManager(klet.kubeClient, kubeCfg, klet.nodeName, klet.getLastObservedNodeAddresses, certDirectory)
if err != nil {
return nil, fmt.Errorf("failed to initialize certificate manager: %w", err)
}
} else if kubeDeps.TLSOptions.CertFile != "" && kubeDeps.TLSOptions.KeyFile != "" && utilfeature.DefaultFeatureGate.Enabled(features.ReloadKubeletServerCertificateFile) {
klet.serverCertificateManager, err = kubeletcertificate.NewKubeletServerCertificateDynamicFileManager(kubeDeps.TLSOptions.CertFile, kubeDeps.TLSOptions.KeyFile)
if err != nil {
return nil, fmt.Errorf("failed to initialize file based certificate manager: %w", err)
}
}
if klet.serverCertificateManager != nil {
kubeDeps.TLSOptions.Config.GetCertificate = func(*tls.ClientHelloInfo) (*tls.Certificate, error) {
cert := klet.serverCertificateManager.Current()
if cert == nil {
return nil, fmt.Errorf("no serving certificate available for the kubelet")
}
return cert, nil
}
}
}
if kubeDeps.ProbeManager != nil {
klet.probeManager = kubeDeps.ProbeManager
} else {
klet.probeManager = prober.NewManager(
klet.statusManager,
klet.livenessManager,
klet.readinessManager,
klet.startupManager,
klet.runner,
kubeDeps.Recorder)
}
tokenManager := token.NewManager(kubeDeps.KubeClient)
var clusterTrustBundleManager clustertrustbundle.Manager
if kubeDeps.KubeClient != nil && utilfeature.DefaultFeatureGate.Enabled(features.ClusterTrustBundleProjection) {
kubeInformers := informers.NewSharedInformerFactoryWithOptions(kubeDeps.KubeClient, 0)
clusterTrustBundleManager, err = clustertrustbundle.NewInformerManager(kubeInformers.Certificates().V1alpha1().ClusterTrustBundles(), 2*int(kubeCfg.MaxPods), 5*time.Minute)
if err != nil {
return nil, fmt.Errorf("while starting informer-based ClusterTrustBundle manager: %w", err)
}
kubeInformers.Start(wait.NeverStop)
klog.InfoS("Started ClusterTrustBundle informer")
} else {
// In static kubelet mode, use a no-op manager.
clusterTrustBundleManager = &clustertrustbundle.NoopManager{}
klog.InfoS("Not starting ClusterTrustBundle informer because we are in static kubelet mode")
}
// NewInitializedVolumePluginMgr initializes some storageErrors on the Kubelet runtimeState (in csi_plugin.go init)
// which affects node ready status. This function must be called before Kubelet is initialized so that the Node
// ReadyState is accurate with the storage state.
klet.volumePluginMgr, err =
NewInitializedVolumePluginMgr(klet, secretManager, configMapManager, tokenManager, clusterTrustBundleManager, kubeDeps.VolumePlugins, kubeDeps.DynamicPluginProber)
if err != nil {
return nil, err
}
klet.pluginManager = pluginmanager.NewPluginManager(
klet.getPluginsRegistrationDir(), /* sockDir */
kubeDeps.Recorder,
)
// If the experimentalMounterPathFlag is set, we do not want to
// check node capabilities since the mount path is not the default
if len(experimentalMounterPath) != 0 {
// Replace the nameserver in containerized-mounter's rootfs/etc/resolv.conf with kubelet.ClusterDNS
// so that service name could be resolved
klet.dnsConfigurer.SetupDNSinContainerizedMounter(experimentalMounterPath)
}
// setup volumeManager
klet.volumeManager = volumemanager.NewVolumeManager(
kubeCfg.EnableControllerAttachDetach,
nodeName,
klet.podManager,
klet.podWorkers,
klet.kubeClient,
klet.volumePluginMgr,
klet.containerRuntime,
kubeDeps.Mounter,
kubeDeps.HostUtil,
klet.getPodsDir(),
kubeDeps.Recorder,
volumepathhandler.NewBlockVolumePathHandler())
klet.backOff = flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
// setup eviction manager
evictionManager, evictionAdmitHandler := eviction.NewManager(klet.resourceAnalyzer, evictionConfig,
killPodNow(klet.podWorkers, kubeDeps.Recorder), klet.imageManager, klet.containerGC, kubeDeps.Recorder, nodeRef, klet.clock, kubeCfg.LocalStorageCapacityIsolation)
klet.evictionManager = evictionManager
klet.admitHandlers.AddPodAdmitHandler(evictionAdmitHandler)
// Safe, allowed sysctls can always be used as unsafe sysctls in the spec.
// Hence, we concatenate those two lists.
safeAndUnsafeSysctls := append(sysctl.SafeSysctlAllowlist(), allowedUnsafeSysctls...)
sysctlsAllowlist, err := sysctl.NewAllowlist(safeAndUnsafeSysctls)
if err != nil {
return nil, err
}
klet.admitHandlers.AddPodAdmitHandler(sysctlsAllowlist)
// enable active deadline handler
activeDeadlineHandler, err := newActiveDeadlineHandler(klet.statusManager, kubeDeps.Recorder, klet.clock)
if err != nil {
return nil, err
}
klet.AddPodSyncLoopHandler(activeDeadlineHandler)
klet.AddPodSyncHandler(activeDeadlineHandler)
klet.admitHandlers.AddPodAdmitHandler(klet.containerManager.GetAllocateResourcesPodAdmitHandler())
criticalPodAdmissionHandler := preemption.NewCriticalPodAdmissionHandler(klet.GetActivePods, killPodNow(klet.podWorkers, kubeDeps.Recorder), kubeDeps.Recorder)
klet.admitHandlers.AddPodAdmitHandler(lifecycle.NewPredicateAdmitHandler(klet.getNodeAnyWay, criticalPodAdmissionHandler, klet.containerManager.UpdatePluginResources))
// apply functional Option's
for _, opt := range kubeDeps.Options {
opt(klet)
}
if sysruntime.GOOS == "linux" {
// AppArmor is a Linux kernel security module and it does not support other operating systems.
klet.appArmorValidator = apparmor.NewValidator()
klet.admitHandlers.AddPodAdmitHandler(lifecycle.NewAppArmorAdmitHandler(klet.appArmorValidator))
}
leaseDuration := time.Duration(kubeCfg.NodeLeaseDurationSeconds) * time.Second
renewInterval := time.Duration(float64(leaseDuration) * nodeLeaseRenewIntervalFraction)
klet.nodeLeaseController = lease.NewController(
klet.clock,
klet.heartbeatClient,
string(klet.nodeName),
kubeCfg.NodeLeaseDurationSeconds,
klet.onRepeatedHeartbeatFailure,
renewInterval,
string(klet.nodeName),
v1.NamespaceNodeLease,
util.SetNodeOwnerFunc(klet.heartbeatClient, string(klet.nodeName)))
// setup node shutdown manager
shutdownManager, shutdownAdmitHandler := nodeshutdown.NewManager(&nodeshutdown.Config{
Logger: logger,
ProbeManager: klet.probeManager,
Recorder: kubeDeps.Recorder,
NodeRef: nodeRef,
GetPodsFunc: klet.GetActivePods,
KillPodFunc: killPodNow(klet.podWorkers, kubeDeps.Recorder),
SyncNodeStatusFunc: klet.syncNodeStatus,
ShutdownGracePeriodRequested: kubeCfg.ShutdownGracePeriod.Duration,
ShutdownGracePeriodCriticalPods: kubeCfg.ShutdownGracePeriodCriticalPods.Duration,
ShutdownGracePeriodByPodPriority: kubeCfg.ShutdownGracePeriodByPodPriority,
StateDirectory: rootDirectory,
})
klet.shutdownManager = shutdownManager
klet.usernsManager, err = userns.MakeUserNsManager(klet)
if err != nil {
return nil, err
}
klet.admitHandlers.AddPodAdmitHandler(shutdownAdmitHandler)
// Finally, put the most recent version of the config on the Kubelet, so
// people can see how it was configured.
klet.kubeletConfiguration = *kubeCfg
// Generating the status funcs should be the last thing we do,
// since this relies on the rest of the Kubelet having been constructed.
klet.setNodeStatusFuncs = klet.defaultNodeStatusFuncs()
return klet, nil
}
type serviceLister interface {
List(labels.Selector) ([]*v1.Service, error)
}
// Kubelet is the main kubelet implementation.
type Kubelet struct {
kubeletConfiguration kubeletconfiginternal.KubeletConfiguration
// hostname is the hostname the kubelet detected or was given via flag/config
hostname string
// hostnameOverridden indicates the hostname was overridden via flag/config
hostnameOverridden bool
nodeName types.NodeName
runtimeCache kubecontainer.RuntimeCache
kubeClient clientset.Interface
heartbeatClient clientset.Interface
// mirrorPodClient is used to create and delete mirror pods in the API for static
// pods.
mirrorPodClient kubepod.MirrorClient
rootDirectory string
podLogsDirectory string
lastObservedNodeAddressesMux sync.RWMutex
lastObservedNodeAddresses []v1.NodeAddress
// onRepeatedHeartbeatFailure is called when a heartbeat operation fails more than once. optional.
onRepeatedHeartbeatFailure func()
// podManager stores the desired set of admitted pods and mirror pods that the kubelet should be
// running. The actual set of running pods is stored on the podWorkers. The manager is populated
// by the kubelet config loops which abstracts receiving configuration from many different sources
// (api for regular pods, local filesystem or http for static pods). The manager may be consulted
// by other components that need to see the set of desired pods. Note that not all desired pods are
// running, and not all running pods are in the podManager - for instance, force deleting a pod
// from the apiserver will remove it from the podManager, but the pod may still be terminating and
// tracked by the podWorkers. Components that need to know the actual consumed resources of the
// node or are driven by podWorkers and the sync*Pod methods (status, volume, stats) should also
// consult the podWorkers when reconciling.