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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 (
"crypto/tls"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
goruntime "runtime"
"sort"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/golang/glog"
clientgoclientset "k8s.io/client-go/kubernetes"
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"
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/flowcontrol"
"k8s.io/client-go/util/integer"
"k8s.io/kubernetes/cmd/kubelet/app/options"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/features"
internalapi "k8s.io/kubernetes/pkg/kubelet/apis/cri"
kubeletconfiginternal "k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
kubeletconfigv1alpha1 "k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig/v1alpha1"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/certificate"
"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"
"k8s.io/kubernetes/pkg/kubelet/dockershim/libdocker"
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/gpu"
"k8s.io/kubernetes/pkg/kubelet/gpu/nvidia"
"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/metrics"
"k8s.io/kubernetes/pkg/kubelet/metrics/collectors"
"k8s.io/kubernetes/pkg/kubelet/network"
"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/rkt"
"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"
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/pkg/kubelet/util/queue"
"k8s.io/kubernetes/pkg/kubelet/util/sliceutils"
"k8s.io/kubernetes/pkg/kubelet/volumemanager"
"k8s.io/kubernetes/pkg/security/apparmor"
utildbus "k8s.io/kubernetes/pkg/util/dbus"
kubeio "k8s.io/kubernetes/pkg/util/io"
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/plugin/pkg/scheduler/algorithm/predicates"
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)
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 *options.ContainerRuntimeOptions,
hostnameOverride,
nodeIP,
providerID,
cloudProvider,
certDirectory,
rootDirectory string) (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 {
// TODO(mtaufen): KubeletBuilder:
// Mesos currently uses this as a hook to let them make their own call to
// let them wrap the KubeletBootstrap that CreateAndInitKubelet returns with
// their own KubeletBootstrap. It's a useful hook. I need to think about what
// a nice home for it would be. There seems to be a trend, between this and
// the Options fields below, of providing hooks where you can add extra functionality
// to the Kubelet for your solution. Maybe we should centralize these sorts of things?
Builder Builder
// TODO(mtaufen): ContainerRuntimeOptions and Options:
// Arrays of functions that can do arbitrary things to the Kubelet and the Runtime
// seem like a difficult path to trace when it's time to debug something.
// I'm leaving these fields here for now, but there is likely an easier-to-follow
// way to support their intended use cases. E.g. ContainerRuntimeOptions
// is used by Mesos to set an environment variable in containers which has
// some connection to their container GC. It seems that Mesos intends to use
// Options to add additional node conditions that are updated as part of the
// Kubelet lifecycle (see https://github.com/kubernetes/kubernetes/pull/21521).
// We should think about providing more explicit ways of doing these things.
ContainerRuntimeOptions []kubecontainer.Option
Options []Option
// Injected Dependencies
Auth server.AuthInterface
CAdvisorInterface cadvisor.Interface
Cloud cloudprovider.Interface
ContainerManager cm.ContainerManager
DockerClient libdocker.Interface
EventClient v1core.EventsGetter
HeartbeatClient v1core.CoreV1Interface
KubeClient clientset.Interface
ExternalKubeClient clientgoclientset.Interface
Mounter mount.Interface
NetworkPlugins []network.NetworkPlugin
OOMAdjuster *oom.OOMAdjuster
OSInterface kubecontainer.OSInterface
PodConfig *config.PodConfig
Recorder record.EventRecorder
Writer kubeio.Writer
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) (*config.PodConfig, error) {
manifestURLHeader := make(http.Header)
if kubeCfg.ManifestURLHeader != "" {
pieces := strings.Split(kubeCfg.ManifestURLHeader, ":")
if len(pieces) != 2 {
return nil, fmt.Errorf("manifest-url-header must have a single ':' key-value separator, got %q", kubeCfg.ManifestURLHeader)
}
manifestURLHeader.Set(pieces[0], pieces[1])
}
// source of all configuration
cfg := config.NewPodConfig(config.PodConfigNotificationIncremental, kubeDeps.Recorder)
// define file config source
if kubeCfg.PodManifestPath != "" {
glog.Infof("Adding manifest file: %v", kubeCfg.PodManifestPath)
config.NewSourceFile(kubeCfg.PodManifestPath, nodeName, kubeCfg.FileCheckFrequency.Duration, cfg.Channel(kubetypes.FileSource))
}
// define url config source
if kubeCfg.ManifestURL != "" {
glog.Infof("Adding manifest url %q with HTTP header %v", kubeCfg.ManifestURL, manifestURLHeader)
config.NewSourceURL(kubeCfg.ManifestURL, manifestURLHeader, nodeName, kubeCfg.HTTPCheckFrequency.Duration, cfg.Channel(kubetypes.HTTPSource))
}
if kubeDeps.KubeClient != nil {
glog.Infof("Watching apiserver")
config.NewSourceApiserver(kubeDeps.KubeClient, nodeName, cfg.Channel(kubetypes.ApiserverSource))
}
return cfg, nil
}
func getRuntimeAndImageServices(config *kubeletconfiginternal.KubeletConfiguration) (internalapi.RuntimeService, internalapi.ImageManagerService, error) {
rs, err := remote.NewRemoteRuntimeService(config.RemoteRuntimeEndpoint, config.RuntimeRequestTimeout.Duration)
if err != nil {
return nil, nil, err
}
is, err := remote.NewRemoteImageService(config.RemoteImageEndpoint, config.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 *options.ContainerRuntimeOptions,
hostnameOverride,
nodeIP,
providerID,
cloudProvider,
certDirectory,
rootDirectory string) (*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 := nodeutil.GetHostname(hostnameOverride)
// Query the cloud provider for our node name, default to hostname
nodeName := types.NodeName(hostname)
cloudIPs := []net.IP{}
cloudNames := []string{}
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(hostname)
if err != nil {
return nil, 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)
if utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletServerCertificate) {
nodeAddresses, err := instances.NodeAddresses(nodeName)
if err != nil {
return nil, fmt.Errorf("failed to get the addresses of the current instance from the cloud provider: %v", err)
}
for _, nodeAddress := range nodeAddresses {
switch nodeAddress.Type {
case v1.NodeExternalIP, v1.NodeInternalIP:
ip := net.ParseIP(nodeAddress.Address)
if ip != nil && !ip.IsLoopback() {
cloudIPs = append(cloudIPs, ip)
}
case v1.NodeExternalDNS, v1.NodeInternalDNS, v1.NodeHostName:
cloudNames = append(cloudNames, nodeAddress.Address)
}
}
}
}
if kubeDeps.PodConfig == nil {
var err error
kubeDeps.PodConfig, err = makePodSourceConfig(kubeCfg, kubeDeps, nodeName)
if err != nil {
return nil, err
}
}
containerGCPolicy := kubecontainer.ContainerGCPolicy{
MinAge: kubeCfg.MinimumGCAge.Duration,
MaxPerPodContainer: int(kubeCfg.MaxPerPodContainerCount),
MaxContainers: int(kubeCfg.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 kubeCfg.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: kubeCfg.ExperimentalKernelMemcgNotification,
}
serviceIndexer := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
if kubeDeps.KubeClient != nil {
serviceLW := cache.NewListWatchFromClient(kubeDeps.KubeClient.Core().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.Core().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 {
glog.Warningf("Invalid clusterDNS ip '%q'", ipEntry)
} else {
clusterDNS = append(clusterDNS, ip)
}
}
httpClient := &http.Client{}
klet := &Kubelet{
hostname: hostname,
nodeName: nodeName,
kubeClient: kubeDeps.KubeClient,
heartbeatClient: kubeDeps.HeartbeatClient,
rootDirectory: rootDirectory,
resyncInterval: kubeCfg.SyncFrequency.Duration,
sourcesReady: config.NewSourcesReady(kubeDeps.PodConfig.SeenAllSources),
registerNode: kubeCfg.RegisterNode,
registerSchedulable: kubeCfg.RegisterSchedulable,
clusterDomain: kubeCfg.ClusterDomain,
clusterDNS: clusterDNS,
serviceLister: serviceLister,
nodeInfo: nodeInfo,
masterServiceNamespace: kubeCfg.MasterServiceNamespace,
streamingConnectionIdleTimeout: kubeCfg.StreamingConnectionIdleTimeout.Duration,
recorder: kubeDeps.Recorder,
cadvisor: kubeDeps.CAdvisorInterface,
cloud: kubeDeps.Cloud,
autoDetectCloudProvider: (kubeletconfigv1alpha1.AutoDetectCloudProvider == cloudProvider),
externalCloudProvider: cloudprovider.IsExternal(cloudProvider),
providerID: providerID,
nodeRef: nodeRef,
nodeLabels: kubeCfg.NodeLabels,
nodeStatusUpdateFrequency: kubeCfg.NodeStatusUpdateFrequency.Duration,
os: kubeDeps.OSInterface,
oomWatcher: oomWatcher,
cgroupsPerQOS: kubeCfg.CgroupsPerQOS,
cgroupRoot: kubeCfg.CgroupRoot,
mounter: kubeDeps.Mounter,
writer: kubeDeps.Writer,
maxPods: int(kubeCfg.MaxPods),
podsPerCore: int(kubeCfg.PodsPerCore),
syncLoopMonitor: atomic.Value{},
resolverConfig: kubeCfg.ResolverConfig,
daemonEndpoints: daemonEndpoints,
containerManager: kubeDeps.ContainerManager,
nodeIP: net.ParseIP(nodeIP),
clock: clock.RealClock{},
enableControllerAttachDetach: kubeCfg.EnableControllerAttachDetach,
iptClient: utilipt.New(utilexec.New(), utildbus.New(), utilipt.ProtocolIpv4),
makeIPTablesUtilChains: kubeCfg.MakeIPTablesUtilChains,
iptablesMasqueradeBit: int(kubeCfg.IPTablesMasqueradeBit),
iptablesDropBit: int(kubeCfg.IPTablesDropBit),
experimentalHostUserNamespaceDefaulting: utilfeature.DefaultFeatureGate.Enabled(features.ExperimentalHostUserNamespaceDefaultingGate),
}
secretManager := secret.NewCachingSecretManager(
kubeDeps.KubeClient, secret.GetObjectTTLFromNodeFunc(klet.GetNode))
klet.secretManager = secretManager
configMapManager := configmap.NewCachingConfigMapManager(
kubeDeps.KubeClient, configmap.GetObjectTTLFromNodeFunc(klet.GetNode))
klet.configMapManager = configMapManager
if klet.experimentalHostUserNamespaceDefaulting {
glog.Infof("Experimental host user namespace defaulting is enabled.")
}
hairpinMode, err := effectiveHairpinMode(kubeletconfiginternal.HairpinMode(kubeCfg.HairpinMode), kubeCfg.ContainerRuntime, crOptions.NetworkPluginName)
if err != nil {
// This is a non-recoverable error. Returning it up the callstack will just
// lead to retries of the same failure, so just fail hard.
glog.Fatalf("Invalid hairpin mode: %v", err)
}
glog.Infof("Hairpin mode set to %q", hairpinMode)
// TODO(#36485) Remove this workaround once we fix the init-container issue.
// Touch iptables lock file, which will be shared among all processes accessing
// the iptables.
f, err := os.OpenFile(utilipt.LockfilePath16x, os.O_CREATE, 0600)
if err != nil {
glog.Warningf("Failed to open iptables lock file: %v", err)
} else if err = f.Close(); err != nil {
glog.Warningf("Failed to close iptables lock file: %v", err)
}
plug, err := network.InitNetworkPlugin(kubeDeps.NetworkPlugins, crOptions.NetworkPluginName, &criNetworkHost{&networkHost{klet}, &network.NoopPortMappingGetter{}}, hairpinMode, kubeCfg.NonMasqueradeCIDR, int(crOptions.NetworkPluginMTU))
if err != nil {
return nil, err
}
klet.networkPlugin = plug
machineInfo, err := klet.GetCachedMachineInfo()
if err != nil {
return nil, err
}
imageBackOff := flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
klet.livenessManager = proberesults.NewManager()
klet.podCache = kubecontainer.NewCache()
// podManager is also responsible for keeping secretManager and configMapManager contents up-to-date.
klet.podManager = kubepod.NewBasicPodManager(kubepod.NewBasicMirrorClient(klet.kubeClient), secretManager, configMapManager)
if kubeCfg.RemoteRuntimeEndpoint != "" {
// kubeCfg.RemoteImageEndpoint is same as kubeCfg.RemoteRuntimeEndpoint if not explicitly specified
if kubeCfg.RemoteImageEndpoint == "" {
kubeCfg.RemoteImageEndpoint = kubeCfg.RemoteRuntimeEndpoint
}
}
// TODO: These need to become arguments to a standalone docker shim.
binDir := crOptions.CNIBinDir
if binDir == "" {
binDir = crOptions.NetworkPluginDir
}
pluginSettings := dockershim.NetworkPluginSettings{
HairpinMode: hairpinMode,
NonMasqueradeCIDR: kubeCfg.NonMasqueradeCIDR,
PluginName: crOptions.NetworkPluginName,
PluginConfDir: crOptions.CNIConfDir,
PluginBinDir: binDir,
MTU: int(crOptions.NetworkPluginMTU),
}
klet.resourceAnalyzer = serverstats.NewResourceAnalyzer(klet, kubeCfg.VolumeStatsAggPeriod.Duration)
// Remote runtime shim just cannot talk back to kubelet, so it doesn't
// support bandwidth shaping or hostports till #35457. To enable legacy
// features, replace with networkHost.
var nl *NoOpLegacyHost
pluginSettings.LegacyRuntimeHost = nl
// rktnetes cannot be run with CRI.
if kubeCfg.ContainerRuntime != kubetypes.RktContainerRuntime {
// kubelet defers to the runtime shim to setup networking. Setting
// this to nil will prevent it from trying to invoke the plugin.
// It's easier to always probe and initialize plugins till cri
// becomes the default.
klet.networkPlugin = nil
switch kubeCfg.ContainerRuntime {
case kubetypes.DockerContainerRuntime:
// Create and start the CRI shim running as a grpc server.
streamingConfig := getStreamingConfig(kubeCfg, kubeDeps)
ds, err := dockershim.NewDockerService(kubeDeps.DockerClient, crOptions.PodSandboxImage, streamingConfig,
&pluginSettings, kubeCfg.RuntimeCgroups, kubeCfg.CgroupDriver, crOptions.DockerExecHandlerName,
crOptions.DockershimRootDirectory, crOptions.DockerDisableSharedPID)
if err != nil {
return nil, err
}
if err := ds.Start(); err != nil {
return nil, err
}
// For now, the CRI shim redirects the streaming requests to the
// kubelet, which handles the requests using DockerService..
klet.criHandler = ds
// The unix socket for kubelet <-> dockershim communication.
glog.V(5).Infof("RemoteRuntimeEndpoint: %q, RemoteImageEndpoint: %q",
kubeCfg.RemoteRuntimeEndpoint,
kubeCfg.RemoteImageEndpoint)
glog.V(2).Infof("Starting the GRPC server for the docker CRI shim.")
server := dockerremote.NewDockerServer(kubeCfg.RemoteRuntimeEndpoint, ds)
if err := server.Start(); err != nil {
return nil, err
}
// Create dockerLegacyService when the logging driver is not supported.
supported, err := dockershim.IsCRISupportedLogDriver(kubeDeps.DockerClient)
if err != nil {
return nil, err
}
if !supported {
klet.dockerLegacyService = dockershim.NewDockerLegacyService(kubeDeps.DockerClient)
}
case kubetypes.RemoteContainerRuntime:
// No-op.
break
default:
return nil, fmt.Errorf("unsupported CRI runtime: %q", kubeCfg.ContainerRuntime)
}
runtimeService, imageService, err := getRuntimeAndImageServices(kubeCfg)
if err != nil {
return nil, err
}
klet.runtimeService = runtimeService
runtime, err := kuberuntime.NewKubeGenericRuntimeManager(
kubecontainer.FilterEventRecorder(kubeDeps.Recorder),
klet.livenessManager,
kubeCfg.SeccompProfileRoot,
containerRefManager,
machineInfo,
klet,
kubeDeps.OSInterface,
klet,
httpClient,
imageBackOff,
kubeCfg.SerializeImagePulls,
float32(kubeCfg.RegistryPullQPS),
int(kubeCfg.RegistryBurst),
kubeCfg.CPUCFSQuota,
runtimeService,
imageService,
kubeDeps.ContainerManager.InternalContainerLifecycle(),
)
if err != nil {
return nil, err
}
klet.containerRuntime = runtime
klet.runner = runtime
// CRI integrations should get container metrics via CRI. Docker
// uses the built-in cadvisor to gather such metrics on Linux for
// historical reasons.
// cri-o relies on cadvisor as a temporary workaround. The code should
// be removed. Related issue:
// https://github.com/kubernetes/kubernetes/issues/51798
if (kubeCfg.ContainerRuntime == kubetypes.DockerContainerRuntime &&
goruntime.GOOS == "linux") || kubeCfg.RemoteRuntimeEndpoint == "/var/run/crio.sock" {
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)
}
} else {
// rkt uses the legacy, non-CRI, integration. Configure it the old way.
// TODO: Include hairpin mode settings in rkt?
conf := &rkt.Config{
Path: crOptions.RktPath,
Stage1Image: crOptions.RktStage1Image,
InsecureOptions: "image,ondisk",
}
runtime, err := rkt.New(
crOptions.RktAPIEndpoint,
conf,
klet,
kubeDeps.Recorder,
containerRefManager,
klet,
klet.livenessManager,
httpClient,
klet.networkPlugin,
hairpinMode == kubeletconfiginternal.HairpinVeth,
utilexec.New(),
kubecontainer.RealOS{},
imageBackOff,
kubeCfg.SerializeImagePulls,
float32(kubeCfg.RegistryPullQPS),
int(kubeCfg.RegistryBurst),
kubeCfg.RuntimeRequestTimeout.Duration,
)
if err != nil {
return nil, err
}
klet.containerRuntime = runtime
klet.runner = kubecontainer.DirectStreamingRunner(runtime)
klet.StatsProvider = stats.NewCadvisorStatsProvider(
klet.cadvisor,
klet.resourceAnalyzer,
klet.podManager,
klet.runtimeCache,
klet.containerRuntime)
}
klet.pleg = pleg.NewGenericPLEG(klet.containerRuntime, plegChannelCapacity, plegRelistPeriod, klet.podCache, clock.RealClock{})
klet.runtimeState = newRuntimeState(maxWaitForContainerRuntime)
klet.runtimeState.addHealthCheck("PLEG", klet.pleg.Healthy)
klet.updatePodCIDR(kubeCfg.PodCIDR)
// 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)
if err != nil {
return nil, fmt.Errorf("failed to initialize image manager: %v", err)
}
klet.imageManager = imageManager
klet.statusManager = status.NewManager(klet.kubeClient, klet.podManager, klet)
if utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletServerCertificate) && kubeDeps.TLSOptions != nil {
var ips []net.IP
cfgAddress := net.ParseIP(kubeCfg.Address)
if cfgAddress == nil || cfgAddress.IsUnspecified() {
localIPs, err := allLocalIPsWithoutLoopback()
if err != nil {
return nil, err
}
ips = localIPs
} else {
ips = []net.IP{cfgAddress}
}
ips = append(ips, cloudIPs...)
names := append([]string{klet.GetHostname(), hostnameOverride}, cloudNames...)
klet.serverCertificateManager, err = certificate.NewKubeletServerCertificateManager(klet.kubeClient, kubeCfg, klet.nodeName, ips, names, 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 certificate available")
}
return cert, nil
}
}
klet.probeManager = prober.NewManager(
klet.statusManager,
klet.livenessManager,
klet.runner,
containerRefManager,
kubeDeps.Recorder)
klet.volumePluginMgr, err =
NewInitializedVolumePluginMgr(klet, secretManager, configMapManager, kubeDeps.VolumePlugins, kubeDeps.DynamicPluginProber)
if err != nil {
return nil, err
}
// If the experimentalMounterPathFlag is set, we do not want to
// check node capabilities since the mount path is not the default
if len(kubeCfg.ExperimentalMounterPath) != 0 {
kubeCfg.ExperimentalCheckNodeCapabilitiesBeforeMount = false
// Replace the nameserver in containerized-mounter's rootfs/etc/resolve.conf with kubelet.ClusterDNS
// so that service name could be resolved
klet.setupDNSinContainerizedMounter(kubeCfg.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,
kubeCfg.ExperimentalCheckNodeCapabilitiesBeforeMount,
kubeCfg.KeepTerminatedPodVolumes)
runtimeCache, err := kubecontainer.NewRuntimeCache(klet.containerRuntime)
if err != nil {
return nil, err
}
klet.runtimeCache = runtimeCache
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)
klet.setNodeStatusFuncs = klet.defaultNodeStatusFuncs()
// 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)
// add sysctl admission
runtimeSupport, err := sysctl.NewRuntimeAdmitHandler(klet.containerRuntime)
if err != nil {
return nil, err
}
safeWhitelist, err := sysctl.NewWhitelist(sysctl.SafeSysctlWhitelist(), v1.SysctlsPodAnnotationKey)
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(sysctl.SafeSysctlWhitelist(), kubeCfg.AllowedUnsafeSysctls...)
unsafeWhitelist, err := sysctl.NewWhitelist(safeAndUnsafeSysctls, v1.UnsafeSysctlsPodAnnotationKey)
if err != nil {
return nil, err
}
klet.admitHandlers.AddPodAdmitHandler(runtimeSupport)
klet.admitHandlers.AddPodAdmitHandler(safeWhitelist)
klet.admitHandlers.AddPodAdmitHandler(unsafeWhitelist)
// 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))
// apply functional Option's
for _, opt := range kubeDeps.Options {
opt(klet)
}
klet.appArmorValidator = apparmor.NewValidator(kubeCfg.ContainerRuntime)
klet.softAdmitHandlers.AddPodAdmitHandler(lifecycle.NewAppArmorAdmitHandler(klet.appArmorValidator))
klet.softAdmitHandlers.AddPodAdmitHandler(lifecycle.NewNoNewPrivsAdmitHandler(klet.containerRuntime))
if utilfeature.DefaultFeatureGate.Enabled(features.Accelerators) {
if kubeCfg.ContainerRuntime == kubetypes.DockerContainerRuntime {
if klet.gpuManager, err = nvidia.NewNvidiaGPUManager(klet, kubeDeps.DockerClient); err != nil {
return nil, err
}
} else {
glog.Errorf("Accelerators feature is supported with docker runtime only. Disabling this feature internally.")
}
}
// Set GPU manager to a stub implementation if it is not enabled or cannot be supported.
if klet.gpuManager == nil {
klet.gpuManager = gpu.NewGPUManagerStub()
}
// Finally, put the most recent version of the config on the Kubelet, so
// people can see how it was configured.
klet.kubeletConfiguration = *kubeCfg
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 string
nodeName types.NodeName
runtimeCache kubecontainer.RuntimeCache
kubeClient clientset.Interface
heartbeatClient v1core.CoreV1Interface
iptClient utilipt.Interface
rootDirectory string
// 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
// Set to true to have the node register itself as schedulable.
registerSchedulable bool
// for internal book keeping; access only from within registerWithApiserver
registrationCompleted bool
// If non-empty, use this for container DNS search.
clusterDomain string
// If non-nil, use this for container DNS server.
clusterDNS []net.IP
// 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
// Network plugin.
networkPlugin network.NetworkPlugin
// 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
// 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.
serverCertificateManager certificate.Manager
// Syncs pods statuses with apiserver; also used as a cache of statuses.
statusManager status.Manager
// VolumeManager runs a set of asynchronous loops that figure out which
// volumes need to be attached/mounted/unmounted/detached based on the pods
// scheduled on this node and makes it so.
volumeManager volumemanager.VolumeManager
// Cloud provider interface.
cloud cloudprovider.Interface
// DEPRECATED: auto detecting cloud providers goes against the initiative