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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 (
"fmt"
"net"
"net/http"
"net/url"
"os"
"path"
"sort"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/golang/glog"
clientgoclientset "k8s.io/client-go/kubernetes"
cadvisorapi "github.com/google/cadvisor/info/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"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
clientv1 "k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/clock"
"k8s.io/client-go/util/flowcontrol"
"k8s.io/client-go/util/integer"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/apis/componentconfig"
componentconfigv1alpha1 "k8s.io/kubernetes/pkg/apis/componentconfig/v1alpha1"
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
corelisters "k8s.io/kubernetes/pkg/client/listers/core/v1"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/features"
internalapi "k8s.io/kubernetes/pkg/kubelet/api"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/cm"
"k8s.io/kubernetes/pkg/kubelet/config"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/dockershim"
dockerremote "k8s.io/kubernetes/pkg/kubelet/dockershim/remote"
"k8s.io/kubernetes/pkg/kubelet/dockertools"
"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/kuberuntime"
"k8s.io/kubernetes/pkg/kubelet/lifecycle"
"k8s.io/kubernetes/pkg/kubelet/metrics"
"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"
"k8s.io/kubernetes/pkg/kubelet/server/stats"
"k8s.io/kubernetes/pkg/kubelet/server/streaming"
"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"
"k8s.io/kubernetes/pkg/util/bandwidth"
utildbus "k8s.io/kubernetes/pkg/util/dbus"
utilexec "k8s.io/kubernetes/pkg/util/exec"
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/util/procfs"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
)
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
// Location of container logs.
ContainerLogsDir = "/var/log/containers"
// 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
// Period for performing container garbage collection.
ContainerGCPeriod = time.Minute
// 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)
// bootstrapping interface for kubelet, targets the initialization protocol
type KubeletBootstrap interface {
GetConfiguration() componentconfig.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)
}
// create and initialize a Kubelet instance
type KubeletBuilder func(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *KubeletDeps, standaloneMode bool, hostnameOverride string, nodeIP string) (KubeletBootstrap, error)
// KubeletDeps 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 KubeletDeps 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 KubeletBuilder
// 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 dockertools.DockerInterface
EventClient v1core.EventsGetter
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
TLSOptions *server.TLSOptions
}
// makePodSourceConfig creates a config.PodConfig from the given
// KubeletConfiguration or returns an error.
func makePodSourceConfig(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *KubeletDeps, 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 *componentconfig.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 *componentconfig.KubeletConfiguration, kubeDeps *KubeletDeps, standaloneMode bool, hostnameOverride string, nodeIP string) (*Kubelet, error) {
if kubeCfg.RootDirectory == "" {
return nil, fmt.Errorf("invalid root directory %q", kubeCfg.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)
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 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),
}
diskSpacePolicy := DiskSpacePolicy{
DockerFreeDiskMB: int(kubeCfg.LowDiskSpaceThresholdMB),
RootFreeDiskMB: int(kubeCfg.LowDiskSpaceThresholdMB),
}
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,
}
var dockerExecHandler dockertools.ExecHandler
switch kubeCfg.DockerExecHandlerName {
case "native":
dockerExecHandler = &dockertools.NativeExecHandler{}
case "nsenter":
dockerExecHandler = &dockertools.NsenterExecHandler{}
default:
glog.Warningf("Unknown Docker exec handler %q; defaulting to native", kubeCfg.DockerExecHandlerName)
dockerExecHandler = &dockertools.NativeExecHandler{}
}
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())
cache.NewReflector(serviceLW, &v1.Service{}, serviceIndexer, 0).Run()
}
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)
cache.NewReflector(nodeLW, &v1.Node{}, nodeIndexer, 0).Run()
}
nodeLister := corelisters.NewNodeLister(nodeIndexer)
nodeInfo := &predicates.CachedNodeInfo{NodeLister: nodeLister}
// TODO: get the real node object of ourself,
// and use the real node name and UID.
// TODO: what is namespace for node?
nodeRef := &clientv1.ObjectReference{
Kind: "Node",
Name: string(nodeName),
UID: types.UID(nodeName),
Namespace: "",
}
diskSpaceManager, err := newDiskSpaceManager(kubeDeps.CAdvisorInterface, diskSpacePolicy)
if err != nil {
return nil, fmt.Errorf("failed to initialize disk manager: %v", err)
}
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)
}
}
klet := &Kubelet{
hostname: hostname,
nodeName: nodeName,
dockerClient: kubeDeps.DockerClient,
kubeClient: kubeDeps.KubeClient,
rootDirectory: kubeCfg.RootDirectory,
resyncInterval: kubeCfg.SyncFrequency.Duration,
containerRefManager: containerRefManager,
httpClient: &http.Client{},
sourcesReady: config.NewSourcesReady(kubeDeps.PodConfig.SeenAllSources),
registerNode: kubeCfg.RegisterNode,
registerSchedulable: kubeCfg.RegisterSchedulable,
standaloneMode: standaloneMode,
clusterDomain: kubeCfg.ClusterDomain,
clusterDNS: clusterDNS,
serviceLister: serviceLister,
nodeLister: nodeLister,
nodeInfo: nodeInfo,
masterServiceNamespace: kubeCfg.MasterServiceNamespace,
streamingConnectionIdleTimeout: kubeCfg.StreamingConnectionIdleTimeout.Duration,
recorder: kubeDeps.Recorder,
cadvisor: kubeDeps.CAdvisorInterface,
diskSpaceManager: diskSpaceManager,
cloud: kubeDeps.Cloud,
autoDetectCloudProvider: (componentconfigv1alpha1.AutoDetectCloudProvider == kubeCfg.CloudProvider),
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,
nonMasqueradeCIDR: kubeCfg.NonMasqueradeCIDR,
maxPods: int(kubeCfg.MaxPods),
podsPerCore: int(kubeCfg.PodsPerCore),
syncLoopMonitor: atomic.Value{},
resolverConfig: kubeCfg.ResolverConfig,
cpuCFSQuota: kubeCfg.CPUCFSQuota,
daemonEndpoints: daemonEndpoints,
containerManager: kubeDeps.ContainerManager,
nodeIP: net.ParseIP(nodeIP),
clock: clock.RealClock{},
outOfDiskTransitionFrequency: kubeCfg.OutOfDiskTransitionFrequency.Duration,
enableCustomMetrics: kubeCfg.EnableCustomMetrics,
babysitDaemons: kubeCfg.BabysitDaemons,
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
if klet.experimentalHostUserNamespaceDefaulting {
glog.Infof("Experimental host user namespace defaulting is enabled.")
}
if mode, err := effectiveHairpinMode(componentconfig.HairpinMode(kubeCfg.HairpinMode), kubeCfg.ContainerRuntime, kubeCfg.NetworkPluginName); 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)
} else {
klet.hairpinMode = mode
}
glog.Infof("Hairpin mode set to %q", klet.hairpinMode)
if plug, err := network.InitNetworkPlugin(kubeDeps.NetworkPlugins, kubeCfg.NetworkPluginName, &criNetworkHost{&networkHost{klet}, &network.NoopPortMappingGetter{}}, klet.hairpinMode, klet.nonMasqueradeCIDR, int(kubeCfg.NetworkPluginMTU)); err != nil {
return nil, err
} else {
klet.networkPlugin = plug
}
machineInfo, err := klet.GetCachedMachineInfo()
if err != nil {
return nil, err
}
procFs := procfs.NewProcFS()
imageBackOff := flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
klet.livenessManager = proberesults.NewManager()
klet.podCache = kubecontainer.NewCache()
// podManager is also responsible for keeping secretManager contents up-to-date.
klet.podManager = kubepod.NewBasicPodManager(kubepod.NewBasicMirrorClient(klet.kubeClient), secretManager)
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 := kubeCfg.CNIBinDir
if binDir == "" {
binDir = kubeCfg.NetworkPluginDir
}
pluginSettings := dockershim.NetworkPluginSettings{
HairpinMode: klet.hairpinMode,
NonMasqueradeCIDR: klet.nonMasqueradeCIDR,
PluginName: kubeCfg.NetworkPluginName,
PluginConfDir: kubeCfg.CNIConfDir,
PluginBinDir: binDir,
MTU: int(kubeCfg.NetworkPluginMTU),
}
// 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 != "rkt" && kubeCfg.EnableCRI {
// 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 "docker":
// Create and start the CRI shim running as a grpc server.
streamingConfig := getStreamingConfig(kubeCfg, kubeDeps)
ds, err := dockershim.NewDockerService(klet.dockerClient, kubeCfg.SeccompProfileRoot, kubeCfg.PodInfraContainerImage,
streamingConfig, &pluginSettings, kubeCfg.RuntimeCgroups, kubeCfg.CgroupDriver, dockerExecHandler)
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
const (
// The unix socket for kubelet <-> dockershim communication.
ep = "/var/run/dockershim.sock"
)
kubeCfg.RemoteRuntimeEndpoint, kubeCfg.RemoteImageEndpoint = ep, ep
glog.V(2).Infof("Starting the GRPC server for the docker CRI shim.")
server := dockerremote.NewDockerServer(ep, ds)
if err := server.Start(); err != nil {
return nil, err
}
// Create dockerLegacyService when the logging driver is not supported.
supported, err := dockershim.IsCRISupportedLogDriver(klet.dockerClient)
if err != nil {
return nil, err
}
if !supported {
klet.dockerLegacyService = dockershim.NewDockerLegacyService(klet.dockerClient)
}
case "remote":
// No-op.
break
default:
return nil, fmt.Errorf("unsupported CRI runtime: %q", kubeCfg.ContainerRuntime)
}
runtimeService, imageService, err := getRuntimeAndImageServices(kubeCfg)
runtime, err := kuberuntime.NewKubeGenericRuntimeManager(
kubecontainer.FilterEventRecorder(kubeDeps.Recorder),
klet.livenessManager,
containerRefManager,
machineInfo,
klet.podManager,
kubeDeps.OSInterface,
klet.networkPlugin,
klet,
klet.httpClient,
imageBackOff,
kubeCfg.SerializeImagePulls,
float32(kubeCfg.RegistryPullQPS),
int(kubeCfg.RegistryBurst),
klet.cpuCFSQuota,
runtimeService,
imageService,
)
if err != nil {
return nil, err
}
klet.containerRuntime = runtime
klet.runner = runtime
} else {
switch kubeCfg.ContainerRuntime {
case "docker":
runtime := dockertools.NewDockerManager(
kubeDeps.DockerClient,
kubecontainer.FilterEventRecorder(kubeDeps.Recorder),
klet.livenessManager,
containerRefManager,
klet.podManager,
machineInfo,
kubeCfg.PodInfraContainerImage,
float32(kubeCfg.RegistryPullQPS),
int(kubeCfg.RegistryBurst),
ContainerLogsDir,
kubeDeps.OSInterface,
klet.networkPlugin,
klet,
klet.httpClient,
dockerExecHandler,
kubeDeps.OOMAdjuster,
procFs,
klet.cpuCFSQuota,
imageBackOff,
kubeCfg.SerializeImagePulls,
kubeCfg.EnableCustomMetrics,
// If using "kubenet", the Kubernetes network plugin that wraps
// CNI's bridge plugin, it knows how to set the hairpin veth flag
// so we tell the container runtime to back away from setting it.
// If the kubelet is started with any other plugin we can't be
// sure it handles the hairpin case so we instruct the docker
// runtime to set the flag instead.
klet.hairpinMode == componentconfig.HairpinVeth && kubeCfg.NetworkPluginName != "kubenet",
kubeCfg.SeccompProfileRoot,
kubeDeps.ContainerRuntimeOptions...,
)
klet.containerRuntime = runtime
klet.runner = kubecontainer.DirectStreamingRunner(runtime)
case "rkt":
// TODO: Include hairpin mode settings in rkt?
conf := &rkt.Config{
Path: kubeCfg.RktPath,
Stage1Image: kubeCfg.RktStage1Image,
InsecureOptions: "image,ondisk",
}
runtime, err := rkt.New(
kubeCfg.RktAPIEndpoint,
conf,
klet,
kubeDeps.Recorder,
containerRefManager,
klet.podManager,
klet.livenessManager,
klet.httpClient,
klet.networkPlugin,
klet.hairpinMode == componentconfig.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)
default:
return nil, fmt.Errorf("unsupported container runtime %q specified", kubeCfg.ContainerRuntime)
}
}
// TODO: Factor out "StatsProvider" from Kubelet so we don't have a cyclic dependency
klet.resourceAnalyzer = stats.NewResourceAnalyzer(klet, kubeCfg.VolumeStatsAggPeriod.Duration, 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)
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, kubeDeps.CAdvisorInterface, 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)
klet.probeManager = prober.NewManager(
klet.statusManager,
klet.livenessManager,
klet.runner,
containerRefManager,
kubeDeps.Recorder)
klet.volumePluginMgr, err =
NewInitializedVolumePluginMgr(klet, secretManager, kubeDeps.VolumePlugins)
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
}
// setup volumeManager
klet.volumeManager, err = 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, 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))
if utilfeature.DefaultFeatureGate.Enabled(features.Accelerators) {
if kubeCfg.ContainerRuntime == "docker" {
if klet.gpuManager, err = nvidia.NewNvidiaGPUManager(klet, klet.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)
}
type nodeLister interface {
List(labels.Selector) ([]*v1.Node, error)
}
// Kubelet is the main kubelet implementation.
type Kubelet struct {
kubeletConfiguration componentconfig.KubeletConfiguration
hostname string
nodeName types.NodeName
dockerClient dockertools.DockerInterface
runtimeCache kubecontainer.RuntimeCache
kubeClient clientset.Interface
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
// Needed to report events for containers belonging to deleted/modified pods.
// Tracks references for reporting events
containerRefManager *kubecontainer.RefManager
// Optional, defaults to /logs/ from /var/log
logServer http.Handler
// Optional, defaults to simple Docker implementation
runner kubecontainer.ContainerCommandRunner
// Optional, client for http requests, defaults to empty client
httpClient kubetypes.HttpGetter
// 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
// Set to true if the kubelet is in standalone mode (i.e. setup without an apiserver)
standaloneMode 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
// nodeLister knows how to list nodes
nodeLister nodeLister
// 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
// Diskspace manager.
diskSpaceManager diskSpaceManager
// Secret manager.
secretManager secret.Manager
// Cached MachineInfo returned by cadvisor.
machineInfo *cadvisorapi.MachineInfo
// 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
autoDetectCloudProvider bool
// Reference to this node.
nodeRef *clientv1.ObjectReference
// Container runtime.
containerRuntime kubecontainer.Runtime
// reasonCache caches the failure reason of the last creation of all containers, which is
// used for generating ContainerStatus.
reasonCache *ReasonCache
// nodeStatusUpdateFrequency specifies how often kubelet posts node status to master.
// Note: be cautious when changing the constant, it must work with nodeMonitorGracePeriod
// in nodecontroller. There are several constraints:
// 1. nodeMonitorGracePeriod must be N times more than nodeStatusUpdateFrequency, where
// N means number of retries allowed for kubelet to post node status. It is pointless
// to make nodeMonitorGracePeriod be less than nodeStatusUpdateFrequency, since there
// will only be fresh values from Kubelet at an interval of nodeStatusUpdateFrequency.
// The constant must be less than podEvictionTimeout.
// 2. nodeStatusUpdateFrequency needs to be large enough for kubelet to generate node
// status. Kubelet may fail to update node status reliably if the value is too small,
// as it takes time to gather all necessary node information.
nodeStatusUpdateFrequency time.Duration
// Generates pod events.
pleg pleg.PodLifecycleEventGenerator
// Store kubecontainer.PodStatus for all pods.
podCache kubecontainer.Cache
// os is a facade for various syscalls that need to be mocked during testing.
os kubecontainer.OSInterface
// Watcher of out of memory events.
oomWatcher OOMWatcher
// Monitor resource usage
resourceAnalyzer stats.ResourceAnalyzer
// Whether or not we should have the QOS cgroup hierarchy for resource management
cgroupsPerQOS bool
// If non-empty, pass this to the container runtime as the root cgroup.
cgroupRoot string
// Mounter to use for volumes.
mounter mount.Interface
// Writer interface to use for volumes.
writer kubeio.Writer