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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"
"fmt"
"math"
"net"
"net/http"
"net/url"
"os"
"path"
"sort"
"sync"
"sync/atomic"
"time"
cadvisorapi "github.com/google/cadvisor/info/v1"
cadvisorapiv2 "github.com/google/cadvisor/info/v2"
"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"
"k8s.io/apimachinery/pkg/util/clock"
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"
"k8s.io/client-go/dynamic"
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"
"k8s.io/client-go/util/integer"
cloudprovider "k8s.io/cloud-provider"
csiclientset "k8s.io/csi-api/pkg/client/clientset/versioned"
"k8s.io/klog"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/features"
kubeletconfiginternal "k8s.io/kubernetes/pkg/kubelet/apis/config"
internalapi "k8s.io/kubernetes/pkg/kubelet/apis/cri"
pluginwatcherapi "k8s.io/kubernetes/pkg/kubelet/apis/pluginregistration/v1"
"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/checkpointmanager"
"k8s.io/kubernetes/pkg/kubelet/cloudresource"
"k8s.io/kubernetes/pkg/kubelet/cm"
"k8s.io/kubernetes/pkg/kubelet/config"
"k8s.io/kubernetes/pkg/kubelet/configmap"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/dockershim"
dockerremote "k8s.io/kubernetes/pkg/kubelet/dockershim/remote"
"k8s.io/kubernetes/pkg/kubelet/events"
"k8s.io/kubernetes/pkg/kubelet/eviction"
"k8s.io/kubernetes/pkg/kubelet/images"
"k8s.io/kubernetes/pkg/kubelet/kubeletconfig"
"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/nodelease"
"k8s.io/kubernetes/pkg/kubelet/pleg"
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/remote"
"k8s.io/kubernetes/pkg/kubelet/runtimeclass"
"k8s.io/kubernetes/pkg/kubelet/secret"
"k8s.io/kubernetes/pkg/kubelet/server"
serverstats "k8s.io/kubernetes/pkg/kubelet/server/stats"
"k8s.io/kubernetes/pkg/kubelet/server/streaming"
"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/util"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/pkg/kubelet/util/manager"
"k8s.io/kubernetes/pkg/kubelet/util/pluginwatcher"
"k8s.io/kubernetes/pkg/kubelet/util/queue"
"k8s.io/kubernetes/pkg/kubelet/util/sliceutils"
"k8s.io/kubernetes/pkg/kubelet/volumemanager"
"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
"k8s.io/kubernetes/pkg/security/apparmor"
sysctlwhitelist "k8s.io/kubernetes/pkg/security/podsecuritypolicy/sysctl"
utildbus "k8s.io/kubernetes/pkg/util/dbus"
utilipt "k8s.io/kubernetes/pkg/util/iptables"
"k8s.io/kubernetes/pkg/util/mount"
nodeutil "k8s.io/kubernetes/pkg/util/node"
"k8s.io/kubernetes/pkg/util/oom"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/csi"
utilexec "k8s.io/utils/exec"
)
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
// ContainerLogsDir is the location of container logs.
ContainerLogsDir = "/var/log/containers"
// MaxContainerBackOff is the max backoff period, exported for the e2e test
MaxContainerBackOff = 300 * time.Second
// Capacity of the channel for storing pods to kill. A small number should
// suffice because a goroutine is dedicated to check the channel and does
// not block on anything else.
podKillingChannelCapacity = 50
// Period for performing global cleanup tasks.
housekeepingPeriod = time.Second * 2
// Period for performing eviction monitoring.
// TODO ensure this is in sync with internal cadvisor housekeeping.
evictionMonitoringPeriod = time.Second * 10
// The path in containers' filesystems where the hosts file is mounted.
etcHostsPath = "/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.
plegRelistPeriod = time.Second * 1
// 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
)
// 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() 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(address net.IP, port uint, tlsOptions *server.TLSOptions, auth server.AuthInterface, enableDebuggingHandlers, enableContentionProfiling bool)
ListenAndServeReadOnly(address net.IP, port uint)
ListenAndServePodResources()
Run(<-chan kubetypes.PodUpdate)
RunOnce(<-chan kubetypes.PodUpdate) ([]RunPodResult, error)
}
// Builder creates and initializes a Kubelet instance
type Builder func(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
kubeDeps *Dependencies,
crOptions *config.ContainerRuntimeOptions,
containerRuntime string,
runtimeCgroups string,
hostnameOverride string,
nodeIP string,
providerID string,
cloudProvider string,
certDirectory string,
rootDirectory string,
registerNode bool,
registerWithTaints []api.Taint,
allowedUnsafeSysctls []string,
remoteRuntimeEndpoint string,
remoteImageEndpoint string,
experimentalMounterPath string,
experimentalKernelMemcgNotification bool,
experimentalCheckNodeCapabilitiesBeforeMount bool,
experimentalNodeAllocatableIgnoreEvictionThreshold bool,
minimumGCAge metav1.Duration,
maxPerPodContainerCount int32,
maxContainerCount int32,
masterServiceNamespace string,
registerSchedulable bool,
nonMasqueradeCIDR string,
keepTerminatedPodVolumes bool,
nodeLabels map[string]string,
seccompProfileRoot string,
bootstrapCheckpointPath string,
nodeStatusMaxImages int32) (Bootstrap, 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
DockerClientConfig *dockershim.ClientConfig
EventClient v1core.EventsGetter
HeartbeatClient clientset.Interface
OnHeartbeatFailure func()
KubeClient clientset.Interface
CSIClient csiclientset.Interface
DynamicKubeClient dynamic.Interface
Mounter mount.Interface
OOMAdjuster *oom.OOMAdjuster
OSInterface kubecontainer.OSInterface
PodConfig *config.PodConfig
Recorder record.EventRecorder
VolumePlugins []volume.VolumePlugin
DynamicPluginProber volume.DynamicPluginProber
TLSOptions *server.TLSOptions
KubeletConfigController *kubeletconfig.Controller
}
// makePodSourceConfig creates a config.PodConfig from the given
// KubeletConfiguration or returns an error.
func makePodSourceConfig(kubeCfg *kubeletconfiginternal.KubeletConfiguration, kubeDeps *Dependencies, nodeName types.NodeName, bootstrapCheckpointPath string) (*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)
// define file config source
if kubeCfg.StaticPodPath != "" {
klog.Infof("Adding pod path: %v", kubeCfg.StaticPodPath)
config.NewSourceFile(kubeCfg.StaticPodPath, nodeName, kubeCfg.FileCheckFrequency.Duration, cfg.Channel(kubetypes.FileSource))
}
// define url config source
if kubeCfg.StaticPodURL != "" {
klog.Infof("Adding pod url %q with HTTP header %v", kubeCfg.StaticPodURL, manifestURLHeader)
config.NewSourceURL(kubeCfg.StaticPodURL, manifestURLHeader, nodeName, kubeCfg.HTTPCheckFrequency.Duration, cfg.Channel(kubetypes.HTTPSource))
}
// Restore from the checkpoint path
// NOTE: This MUST happen before creating the apiserver source
// below, or the checkpoint would override the source of truth.
var updatechannel chan<- interface{}
if bootstrapCheckpointPath != "" {
klog.Infof("Adding checkpoint path: %v", bootstrapCheckpointPath)
updatechannel = cfg.Channel(kubetypes.ApiserverSource)
err := cfg.Restore(bootstrapCheckpointPath, updatechannel)
if err != nil {
return nil, err
}
}
if kubeDeps.KubeClient != nil {
klog.Infof("Watching apiserver")
if updatechannel == nil {
updatechannel = cfg.Channel(kubetypes.ApiserverSource)
}
config.NewSourceApiserver(kubeDeps.KubeClient, nodeName, updatechannel)
}
return cfg, nil
}
func getRuntimeAndImageServices(remoteRuntimeEndpoint string, remoteImageEndpoint string, runtimeRequestTimeout metav1.Duration) (internalapi.RuntimeService, internalapi.ImageManagerService, error) {
rs, err := remote.NewRemoteRuntimeService(remoteRuntimeEndpoint, runtimeRequestTimeout.Duration)
if err != nil {
return nil, nil, err
}
is, err := remote.NewRemoteImageService(remoteImageEndpoint, runtimeRequestTimeout.Duration)
if err != nil {
return nil, nil, err
}
return rs, is, err
}
// 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,
containerRuntime string,
runtimeCgroups string,
hostnameOverride string,
nodeIP string,
providerID string,
cloudProvider string,
certDirectory string,
rootDirectory string,
registerNode bool,
registerWithTaints []api.Taint,
allowedUnsafeSysctls []string,
remoteRuntimeEndpoint string,
remoteImageEndpoint string,
experimentalMounterPath string,
experimentalKernelMemcgNotification bool,
experimentalCheckNodeCapabilitiesBeforeMount bool,
experimentalNodeAllocatableIgnoreEvictionThreshold bool,
minimumGCAge metav1.Duration,
maxPerPodContainerCount int32,
maxContainerCount int32,
masterServiceNamespace string,
registerSchedulable bool,
nonMasqueradeCIDR string,
keepTerminatedPodVolumes bool,
nodeLabels map[string]string,
seccompProfileRoot string,
bootstrapCheckpointPath string,
nodeStatusMaxImages int32) (*Kubelet, error) {
if rootDirectory == "" {
return nil, fmt.Errorf("invalid root directory %q", rootDirectory)
}
if kubeCfg.SyncFrequency.Duration <= 0 {
return nil, fmt.Errorf("invalid sync frequency %d", kubeCfg.SyncFrequency.Duration)
}
if kubeCfg.MakeIPTablesUtilChains {
if kubeCfg.IPTablesMasqueradeBit > 31 || kubeCfg.IPTablesMasqueradeBit < 0 {
return nil, fmt.Errorf("iptables-masquerade-bit is not valid. Must be within [0, 31]")
}
if kubeCfg.IPTablesDropBit > 31 || kubeCfg.IPTablesDropBit < 0 {
return nil, fmt.Errorf("iptables-drop-bit is not valid. Must be within [0, 31]")
}
if kubeCfg.IPTablesDropBit == kubeCfg.IPTablesMasqueradeBit {
return nil, fmt.Errorf("iptables-masquerade-bit and iptables-drop-bit must be different")
}
}
hostname, err := nodeutil.GetHostname(hostnameOverride)
if err != nil {
return nil, err
}
// Query the cloud provider for our node name, default to hostname
nodeName := types.NodeName(hostname)
if kubeDeps.Cloud != nil {
var err error
instances, ok := kubeDeps.Cloud.Instances()
if !ok {
return nil, fmt.Errorf("failed to get instances from cloud provider")
}
nodeName, err = instances.CurrentNodeName(context.TODO(), hostname)
if err != nil {
return nil, fmt.Errorf("error fetching current instance name from cloud provider: %v", err)
}
klog.V(2).Infof("cloud provider determined current node name to be %s", nodeName)
}
if kubeDeps.PodConfig == nil {
var err error
kubeDeps.PodConfig, err = makePodSourceConfig(kubeCfg, kubeDeps, nodeName, bootstrapCheckpointPath)
if err != nil {
return nil, err
}
}
containerGCPolicy := kubecontainer.ContainerGCPolicy{
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),
}
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: experimentalKernelMemcgNotification,
PodCgroupRoot: kubeDeps.ContainerManager.GetPodCgroupRoot(),
}
serviceIndexer := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
if kubeDeps.KubeClient != nil {
serviceLW := cache.NewListWatchFromClient(kubeDeps.KubeClient.CoreV1().RESTClient(), "services", metav1.NamespaceAll, fields.Everything())
r := cache.NewReflector(serviceLW, &v1.Service{}, serviceIndexer, 0)
go r.Run(wait.NeverStop)
}
serviceLister := corelisters.NewServiceLister(serviceIndexer)
nodeIndexer := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{})
if kubeDeps.KubeClient != nil {
fieldSelector := fields.Set{api.ObjectNameField: string(nodeName)}.AsSelector()
nodeLW := cache.NewListWatchFromClient(kubeDeps.KubeClient.CoreV1().RESTClient(), "nodes", metav1.NamespaceAll, fieldSelector)
r := cache.NewReflector(nodeLW, &v1.Node{}, nodeIndexer, 0)
go r.Run(wait.NeverStop)
}
nodeInfo := &predicates.CachedNodeInfo{NodeLister: corelisters.NewNodeLister(nodeIndexer)}
// TODO: get the real node object of ourself,
// and use the real node name and UID.
// TODO: what is namespace for node?
nodeRef := &v1.ObjectReference{
Kind: "Node",
Name: string(nodeName),
UID: types.UID(nodeName),
Namespace: "",
}
containerRefManager := kubecontainer.NewRefManager()
oomWatcher := NewOOMWatcher(kubeDeps.CAdvisorInterface, kubeDeps.Recorder)
clusterDNS := make([]net.IP, 0, len(kubeCfg.ClusterDNS))
for _, ipEntry := range kubeCfg.ClusterDNS {
ip := net.ParseIP(ipEntry)
if ip == nil {
klog.Warningf("Invalid clusterDNS ip '%q'", ipEntry)
} else {
clusterDNS = append(clusterDNS, ip)
}
}
httpClient := &http.Client{}
parsedNodeIP := net.ParseIP(nodeIP)
protocol := utilipt.ProtocolIpv4
if parsedNodeIP != nil && parsedNodeIP.To4() == nil {
klog.V(0).Infof("IPv6 node IP (%s), assume IPv6 operation", nodeIP)
protocol = utilipt.ProtocolIpv6
}
klet := &Kubelet{
hostname: hostname,
hostnameOverridden: len(hostnameOverride) > 0,
nodeName: nodeName,
kubeClient: kubeDeps.KubeClient,
csiClient: kubeDeps.CSIClient,
heartbeatClient: kubeDeps.HeartbeatClient,
onRepeatedHeartbeatFailure: kubeDeps.OnHeartbeatFailure,
rootDirectory: rootDirectory,
resyncInterval: kubeCfg.SyncFrequency.Duration,
sourcesReady: config.NewSourcesReady(kubeDeps.PodConfig.SeenAllSources),
registerNode: registerNode,
registerWithTaints: registerWithTaints,
registerSchedulable: registerSchedulable,
dnsConfigurer: dns.NewConfigurer(kubeDeps.Recorder, nodeRef, parsedNodeIP, clusterDNS, kubeCfg.ClusterDomain, kubeCfg.ResolverConfig),
serviceLister: serviceLister,
nodeInfo: nodeInfo,
masterServiceNamespace: masterServiceNamespace,
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,
maxPods: int(kubeCfg.MaxPods),
podsPerCore: int(kubeCfg.PodsPerCore),
syncLoopMonitor: atomic.Value{},
daemonEndpoints: daemonEndpoints,
containerManager: kubeDeps.ContainerManager,
containerRuntimeName: containerRuntime,
redirectContainerStreaming: crOptions.RedirectContainerStreaming,
nodeIP: parsedNodeIP,
nodeIPValidator: validateNodeIP,
clock: clock.RealClock{},
enableControllerAttachDetach: kubeCfg.EnableControllerAttachDetach,
iptClient: utilipt.New(utilexec.New(), utildbus.New(), protocol),
makeIPTablesUtilChains: kubeCfg.MakeIPTablesUtilChains,
iptablesMasqueradeBit: int(kubeCfg.IPTablesMasqueradeBit),
iptablesDropBit: int(kubeCfg.IPTablesDropBit),
experimentalHostUserNamespaceDefaulting: utilfeature.DefaultFeatureGate.Enabled(features.ExperimentalHostUserNamespaceDefaultingGate),
keepTerminatedPodVolumes: keepTerminatedPodVolumes,
nodeStatusMaxImages: nodeStatusMaxImages,
enablePluginsWatcher: utilfeature.DefaultFeatureGate.Enabled(features.KubeletPluginsWatcher),
}
if klet.cloud != nil {
klet.cloudResourceSyncManager = cloudresource.NewSyncManager(klet.cloud, nodeName, klet.nodeStatusUpdateFrequency)
}
var secretManager secret.Manager
var configMapManager configmap.Manager
switch kubeCfg.ConfigMapAndSecretChangeDetectionStrategy {
case kubeletconfiginternal.WatchChangeDetectionStrategy:
secretManager = secret.NewWatchingSecretManager(kubeDeps.KubeClient)
configMapManager = configmap.NewWatchingConfigMapManager(kubeDeps.KubeClient)
case kubeletconfiginternal.TTLCacheChangeDetectionStrategy:
secretManager = secret.NewCachingSecretManager(
kubeDeps.KubeClient, manager.GetObjectTTLFromNodeFunc(klet.GetNode))
configMapManager = configmap.NewCachingConfigMapManager(
kubeDeps.KubeClient, manager.GetObjectTTLFromNodeFunc(klet.GetNode))
case kubeletconfiginternal.GetChangeDetectionStrategy:
secretManager = secret.NewSimpleSecretManager(kubeDeps.KubeClient)
configMapManager = configmap.NewSimpleConfigMapManager(kubeDeps.KubeClient)
default:
return nil, fmt.Errorf("unknown configmap and secret manager mode: %v", kubeCfg.ConfigMapAndSecretChangeDetectionStrategy)
}
klet.secretManager = secretManager
klet.configMapManager = configMapManager
if klet.experimentalHostUserNamespaceDefaulting {
klog.Infof("Experimental host user namespace defaulting is enabled.")
}
machineInfo, err := klet.cadvisor.MachineInfo()
if err != nil {
return nil, err
}
klet.machineInfo = machineInfo
imageBackOff := flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
klet.livenessManager = proberesults.NewManager()
klet.podCache = kubecontainer.NewCache()
var checkpointManager checkpointmanager.CheckpointManager
if bootstrapCheckpointPath != "" {
checkpointManager, err = checkpointmanager.NewCheckpointManager(bootstrapCheckpointPath)
if err != nil {
return nil, fmt.Errorf("failed to initialize checkpoint manager: %+v", err)
}
}
// podManager is also responsible for keeping secretManager and configMapManager contents up-to-date.
klet.podManager = kubepod.NewBasicPodManager(kubepod.NewBasicMirrorClient(klet.kubeClient), secretManager, configMapManager, checkpointManager)
if remoteRuntimeEndpoint != "" {
// remoteImageEndpoint is same as remoteRuntimeEndpoint if not explicitly specified
if remoteImageEndpoint == "" {
remoteImageEndpoint = remoteRuntimeEndpoint
}
}
// TODO: These need to become arguments to a standalone docker shim.
pluginSettings := dockershim.NetworkPluginSettings{
HairpinMode: kubeletconfiginternal.HairpinMode(kubeCfg.HairpinMode),
NonMasqueradeCIDR: nonMasqueradeCIDR,
PluginName: crOptions.NetworkPluginName,
PluginConfDir: crOptions.CNIConfDir,
PluginBinDirString: crOptions.CNIBinDir,
MTU: int(crOptions.NetworkPluginMTU),
}
klet.resourceAnalyzer = serverstats.NewResourceAnalyzer(klet, kubeCfg.VolumeStatsAggPeriod.Duration)
if containerRuntime == "rkt" {
klog.Fatalln("rktnetes has been deprecated in favor of rktlet. Please see https://github.com/kubernetes-incubator/rktlet for more information.")
}
// if left at nil, that means it is unneeded
var legacyLogProvider kuberuntime.LegacyLogProvider
switch containerRuntime {
case kubetypes.DockerContainerRuntime:
// Create and start the CRI shim running as a grpc server.
streamingConfig := getStreamingConfig(kubeCfg, kubeDeps, crOptions)
ds, err := dockershim.NewDockerService(kubeDeps.DockerClientConfig, crOptions.PodSandboxImage, streamingConfig,
&pluginSettings, runtimeCgroups, kubeCfg.CgroupDriver, crOptions.DockershimRootDirectory, !crOptions.RedirectContainerStreaming)
if err != nil {
return nil, err
}
if crOptions.RedirectContainerStreaming {
klet.criHandler = ds
}
// The unix socket for kubelet <-> dockershim communication.
klog.V(5).Infof("RemoteRuntimeEndpoint: %q, RemoteImageEndpoint: %q",
remoteRuntimeEndpoint,
remoteImageEndpoint)
klog.V(2).Infof("Starting the GRPC server for the docker CRI shim.")
server := dockerremote.NewDockerServer(remoteRuntimeEndpoint, ds)
if err := server.Start(); err != nil {
return nil, err
}
// Create dockerLegacyService when the logging driver is not supported.
supported, err := ds.IsCRISupportedLogDriver()
if err != nil {
return nil, err
}
if !supported {
klet.dockerLegacyService = ds
legacyLogProvider = ds
}
case kubetypes.RemoteContainerRuntime:
// No-op.
break
default:
return nil, fmt.Errorf("unsupported CRI runtime: %q", containerRuntime)
}
runtimeService, imageService, err := getRuntimeAndImageServices(remoteRuntimeEndpoint, remoteImageEndpoint, kubeCfg.RuntimeRequestTimeout)
if err != nil {
return nil, err
}
klet.runtimeService = runtimeService
if utilfeature.DefaultFeatureGate.Enabled(features.RuntimeClass) && kubeDeps.DynamicKubeClient != nil {
klet.runtimeClassManager = runtimeclass.NewManager(kubeDeps.DynamicKubeClient)
}
runtime, err := kuberuntime.NewKubeGenericRuntimeManager(
kubecontainer.FilterEventRecorder(kubeDeps.Recorder),
klet.livenessManager,
seccompProfileRoot,
containerRefManager,
machineInfo,
klet,
kubeDeps.OSInterface,
klet,
httpClient,
imageBackOff,
kubeCfg.SerializeImagePulls,
float32(kubeCfg.RegistryPullQPS),
int(kubeCfg.RegistryBurst),
kubeCfg.CPUCFSQuota,
kubeCfg.CPUCFSQuotaPeriod,
runtimeService,
imageService,
kubeDeps.ContainerManager.InternalContainerLifecycle(),
legacyLogProvider,
klet.runtimeClassManager,
)
if err != nil {
return nil, err
}
klet.containerRuntime = runtime
klet.streamingRuntime = runtime
klet.runner = runtime
runtimeCache, err := kubecontainer.NewRuntimeCache(klet.containerRuntime)
if err != nil {
return nil, err
}
klet.runtimeCache = runtimeCache
if cadvisor.UsingLegacyCadvisorStats(containerRuntime, remoteRuntimeEndpoint) {
klet.StatsProvider = stats.NewCadvisorStatsProvider(
klet.cadvisor,
klet.resourceAnalyzer,
klet.podManager,
klet.runtimeCache,
klet.containerRuntime)
} else {
klet.StatsProvider = stats.NewCRIStatsProvider(
klet.cadvisor,
klet.resourceAnalyzer,
klet.podManager,
klet.runtimeCache,
runtimeService,
imageService,
stats.NewLogMetricsService())
}
klet.pleg = pleg.NewGenericPLEG(klet.containerRuntime, plegChannelCapacity, plegRelistPeriod, klet.podCache, clock.RealClock{})
klet.runtimeState = newRuntimeState(maxWaitForContainerRuntime)
klet.runtimeState.addHealthCheck("PLEG", klet.pleg.Healthy)
if _, err := klet.updatePodCIDR(kubeCfg.PodCIDR); err != nil {
klog.Errorf("Pod CIDR update failed %v", err)
}
// 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, integer.IntMax(containerGCPolicy.MaxPerPodContainer, minDeadContainerInPod))
// setup imageManager
imageManager, err := images.NewImageGCManager(klet.containerRuntime, klet.StatsProvider, kubeDeps.Recorder, nodeRef, imageGCPolicy, crOptions.PodSandboxImage)
if err != nil {
return nil, fmt.Errorf("failed to initialize image manager: %v", err)
}
klet.imageManager = imageManager
if containerRuntime == kubetypes.RemoteContainerRuntime && utilfeature.DefaultFeatureGate.Enabled(features.CRIContainerLogRotation) {
// setup containerLogManager for CRI container runtime
containerLogManager, err := logs.NewContainerLogManager(
klet.runtimeService,
kubeCfg.ContainerLogMaxSize,
int(kubeCfg.ContainerLogMaxFiles),
)
if err != nil {
return nil, fmt.Errorf("failed to initialize container log manager: %v", err)
}
klet.containerLogManager = containerLogManager
} else {
klet.containerLogManager = logs.NewStubContainerLogManager()
}
klet.statusManager = status.NewManager(klet.kubeClient, klet.podManager, klet)
if kubeCfg.ServerTLSBootstrap && kubeDeps.TLSOptions != nil && 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: %v", err)
}
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
}
}
klet.probeManager = prober.NewManager(
klet.statusManager,
klet.livenessManager,
klet.runner,
containerRefManager,
kubeDeps.Recorder)
tokenManager := token.NewManager(kubeDeps.KubeClient)
if !utilfeature.DefaultFeatureGate.Enabled(features.MountPropagation) {
return nil, fmt.Errorf("mount propagation feature gate has been deprecated and will be removed in 1.14")
}
klet.volumePluginMgr, err =
NewInitializedVolumePluginMgr(klet, secretManager, configMapManager, tokenManager, kubeDeps.VolumePlugins, kubeDeps.DynamicPluginProber)
if err != nil {
return nil, err
}
if klet.enablePluginsWatcher {
klet.pluginWatcher = pluginwatcher.NewWatcher(klet.getPluginsDir())
}
// 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 {
experimentalCheckNodeCapabilitiesBeforeMount = false
// Replace the nameserver in containerized-mounter's rootfs/etc/resolve.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.statusManager,
klet.kubeClient,
klet.volumePluginMgr,
klet.containerRuntime,
kubeDeps.Mounter,
klet.getPodsDir(),
kubeDeps.Recorder,
experimentalCheckNodeCapabilitiesBeforeMount,
keepTerminatedPodVolumes)
klet.reasonCache = NewReasonCache()
klet.workQueue = queue.NewBasicWorkQueue(klet.clock)
klet.podWorkers = newPodWorkers(klet.syncPod, kubeDeps.Recorder, klet.workQueue, klet.resyncInterval, backOffPeriod, klet.podCache)
klet.backOff = flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
klet.podKillingCh = make(chan *kubecontainer.PodPair, podKillingChannelCapacity)
// setup eviction manager
evictionManager, evictionAdmitHandler := eviction.NewManager(klet.resourceAnalyzer, evictionConfig, killPodNow(klet.podWorkers, kubeDeps.Recorder), klet.imageManager, klet.containerGC, kubeDeps.Recorder, nodeRef, klet.clock)
klet.evictionManager = evictionManager
klet.admitHandlers.AddPodAdmitHandler(evictionAdmitHandler)
if utilfeature.DefaultFeatureGate.Enabled(features.Sysctls) {
// add sysctl admission
runtimeSupport, err := sysctl.NewRuntimeAdmitHandler(klet.containerRuntime)
if err != nil {
return nil, err
}
// Safe, whitelisted sysctls can always be used as unsafe sysctls in the spec.
// Hence, we concatenate those two lists.
safeAndUnsafeSysctls := append(sysctlwhitelist.SafeSysctlWhitelist(), allowedUnsafeSysctls...)
sysctlsWhitelist, err := sysctl.NewWhitelist(safeAndUnsafeSysctls)
if err != nil {
return nil, err
}
klet.admitHandlers.AddPodAdmitHandler(runtimeSupport)
klet.admitHandlers.AddPodAdmitHandler(sysctlsWhitelist)
}
// 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)
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)
}
klet.appArmorValidator = apparmor.NewValidator(containerRuntime)
klet.softAdmitHandlers.AddPodAdmitHandler(lifecycle.NewAppArmorAdmitHandler(klet.appArmorValidator))
klet.softAdmitHandlers.AddPodAdmitHandler(lifecycle.NewNoNewPrivsAdmitHandler(klet.containerRuntime))
if utilfeature.DefaultFeatureGate.Enabled(features.NodeLease) {
klet.nodeLeaseController = nodelease.NewController(klet.clock, klet.heartbeatClient, string(klet.nodeName), kubeCfg.NodeLeaseDurationSeconds, klet.onRepeatedHeartbeatFailure)
}
klet.softAdmitHandlers.AddPodAdmitHandler(lifecycle.NewProcMountAdmitHandler(klet.containerRuntime))
// 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
csiClient csiclientset.Interface
heartbeatClient clientset.Interface
iptClient utilipt.Interface
rootDirectory string
lastObservedNodeAddressesMux sync.Mutex
lastObservedNodeAddresses []v1.NodeAddress
// onRepeatedHeartbeatFailure is called when a heartbeat operation fails more than once. optional.
onRepeatedHeartbeatFailure func()
// podWorkers handle syncing Pods in response to events.
podWorkers PodWorkers
// resyncInterval is the interval between periodic full reconciliations of
// pods on this node.
resyncInterval time.Duration
// sourcesReady records the sources seen by the kubelet, it is thread-safe.
sourcesReady config.SourcesReady
// podManager is a facade that abstracts away the various sources of pods
// this Kubelet services.
podManager kubepod.Manager
// Needed to observe and respond to situations that could impact node stability
evictionManager eviction.Manager
// Optional, defaults to /logs/ from /var/log
logServer http.Handler
// Optional, defaults to simple Docker implementation
runner kubecontainer.ContainerCommandRunner
// cAdvisor used for container information.
cadvisor cadvisor.Interface
// Set to true to have the node register itself with the apiserver.
registerNode bool
// List of taints to add to a node object when the kubelet registers itself.
registerWithTaints []api.Taint
// Set to true to have the node register itself as schedulable.
registerSchedulable bool
// for internal book keeping; access only from within registerWithApiserver
registrationCompleted bool
// dnsConfigurer is used for setting up DNS resolver configuration when launching pods.
dnsConfigurer *dns.Configurer
// masterServiceNamespace is the namespace that the master service is exposed in.
masterServiceNamespace string
// serviceLister knows how to list services
serviceLister serviceLister
// nodeInfo knows how to get information about the node for this kubelet.
nodeInfo predicates.NodeInfo
// a list of node labels to register
nodeLabels map[string]string
// Last timestamp when runtime responded on ping.
// Mutex is used to protect this value.
runtimeState *runtimeState
// Volume plugins.
volumePluginMgr *volume.VolumePluginMgr
// Handles container probing.
probeManager prober.Manager
// Manages container health check results.
livenessManager proberesults.Manager
// How long to keep idle streaming command execution/port forwarding
// connections open before terminating them
streamingConnectionIdleTimeout time.Duration
// The EventRecorder to use
recorder record.EventRecorder
// Policy for handling garbage collection of dead containers.
containerGC kubecontainer.ContainerGC
// Manager for image garbage collection.
imageManager images.ImageGCManager
// Manager for container logs.
containerLogManager logs.ContainerLogManager
// Secret manager.
secretManager secret.Manager
// ConfigMap manager.
configMapManager configmap.Manager
// Cached MachineInfo returned by cadvisor.
machineInfo *cadvisorapi.MachineInfo
//Cached RootFsInfo returned by cadvisor
rootfsInfo *cadvisorapiv2.FsInfo
// Handles certificate rotations.