kubelet

package
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 Go to latest Published: Jan 12, 2025 License: Apache-2.0 Imports: 146 Imported by: 0

Documentation

Overview

Package kubelet is the package that contains the libraries that drive the Kubelet binary. The kubelet is responsible for node level pod management. It runs on each worker in the cluster.

Index

Constants

View Source 
const (

	// DefaultContainerLogsDir is the location of container logs.
	DefaultContainerLogsDir = "/var/log/containers"

	// MaxContainerBackOff is the max backoff period, exported for the e2e test
	MaxContainerBackOff = 300 * time.Second

	// 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
)
View Source 
const (
	// KubeIPTablesHintChain is the chain whose existence in either iptables-legacy
	// or iptables-nft indicates which version of iptables the system is using
	KubeIPTablesHintChain utiliptables.Chain = "KUBE-IPTABLES-HINT"

	// KubeFirewallChain is kubernetes firewall rules
	KubeFirewallChain utiliptables.Chain = "KUBE-FIREWALL"
)
View Source 
const (
	PodInitializing   = "PodInitializing"
	ContainerCreating = "ContainerCreating"
)

Container state reason list

View Source 
const (
	// NetworkNotReadyErrorMsg is used to describe the error that network is not ready
	NetworkNotReadyErrorMsg = "network is not ready"
)

Variables

View Source 
var (
	// ContainerLogsDir can be overwrited for testing usage
	ContainerLogsDir = DefaultContainerLogsDir
)
View Source 
var (
	// ErrNetworkUnknown indicates the network state is unknown
	ErrNetworkUnknown = errors.New("network state unknown")
)

Functions

func MakeUserNsManager 

func MakeUserNsManager(kl userNsPodsManager) (*usernsManager, error)

func NewInitializedVolumePluginMgr 

func NewInitializedVolumePluginMgr(
	kubelet *Kubelet,
	secretManager secret.Manager,
	configMapManager configmap.Manager,
	tokenManager *token.Manager,
	plugins []volume.VolumePlugin,
	prober volume.DynamicPluginProber) (*volume.VolumePluginMgr, error)

NewInitializedVolumePluginMgr returns a new instance of volume.VolumePluginMgr initialized with kubelets implementation of the volume.VolumeHost interface.

kubelet - used by VolumeHost methods to expose kubelet specific parameters plugins - used to initialize volumePluginMgr

func PreInitRuntimeService 

func PreInitRuntimeService(kubeCfg *kubeletconfiginternal.KubeletConfiguration, kubeDeps *Dependencies) error

PreInitRuntimeService will init runtime service before RunKubelet.

Types

type Bootstrap 

type Bootstrap interface {
	GetConfiguration() kubeletconfiginternal.KubeletConfiguration
	BirthCry()
	StartGarbageCollection()
	ListenAndServe(kubeCfg *kubeletconfiginternal.KubeletConfiguration, tlsOptions *server.TLSOptions, auth server.AuthInterface, tp trace.TracerProvider)
	ListenAndServeReadOnly(address net.IP, port uint)
	ListenAndServePodResources()
	Run(<-chan kubetypes.PodUpdate)
	RunOnce(<-chan kubetypes.PodUpdate) ([]RunPodResult, error)
}

Bootstrap is a bootstrapping interface for kubelet, targets the initialization protocol

type Dependencies 

type Dependencies struct {
	Options []Option

	// Injected Dependencies
	Auth                     server.AuthInterface
	CAdvisorInterface        cadvisor.Interface
	Cloud                    cloudprovider.Interface
	ContainerManager         cm.ContainerManager
	EventClient              v1core.EventsGetter
	HeartbeatClient          clientset.Interface
	OnHeartbeatFailure       func()
	KubeClient               clientset.Interface
	Mounter                  mount.Interface
	HostUtil                 hostutil.HostUtils
	OOMAdjuster              *oom.OOMAdjuster
	OSInterface              kubecontainer.OSInterface
	PodConfig                *config.PodConfig
	ProbeManager             prober.Manager
	Recorder                 record.EventRecorder
	Subpather                subpath.Interface
	TracerProvider           trace.TracerProvider
	VolumePlugins            []volume.VolumePlugin
	DynamicPluginProber      volume.DynamicPluginProber
	TLSOptions               *server.TLSOptions
	RemoteRuntimeService     internalapi.RuntimeService
	RemoteImageService       internalapi.ImageManagerService
	PodStartupLatencyTracker util.PodStartupLatencyTracker
	// contains filtered or unexported fields
}

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 KillPodOptions 

type KillPodOptions struct {
	// CompletedCh is closed when the kill request completes (syncTerminatingPod has completed
	// without error) or if the pod does not exist, or if the pod has already terminated. This
	// could take an arbitrary amount of time to be closed, but is never left open once
	// CouldHaveRunningContainers() returns false.
	CompletedCh chan<- struct{}
	// Evict is true if this is a pod triggered eviction - once a pod is evicted some resources are
	// more aggressively reaped than during normal pod operation (stopped containers).
	Evict bool
	// PodStatusFunc is invoked (if set) and overrides the status of the pod at the time the pod is killed.
	// The provided status is populated from the latest state.
	PodStatusFunc PodStatusFunc
	// PodTerminationGracePeriodSecondsOverride is optional override to use if a pod is being killed as part of kill operation.
	PodTerminationGracePeriodSecondsOverride *int64
}

KillPodOptions are options when performing a pod update whose update type is kill.

type Kubelet 

type Kubelet struct {

	// the list of handlers to call during pod sync loop.
	lifecycle.PodSyncLoopHandlers

	// the list of handlers to call during pod sync.
	lifecycle.PodSyncHandlers

	// StatsProvider provides the node and the container stats.
	StatsProvider *stats.Provider
	// contains filtered or unexported fields
}

Kubelet is the main kubelet implementation.

func NewMainKubelet 

func NewMainKubelet(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
	kubeDeps *Dependencies,
	crOptions *config.ContainerRuntimeOptions,
	hostname string,
	hostnameOverridden bool,
	nodeName types.NodeName,
	nodeIPs []net.IP,
	providerID string,
	cloudProvider string,
	certDirectory string,
	rootDirectory string,
	imageCredentialProviderConfigFile string,
	imageCredentialProviderBinDir string,
	registerNode bool,
	registerWithTaints []v1.Taint,
	allowedUnsafeSysctls []string,
	experimentalMounterPath string,
	kernelMemcgNotification bool,
	experimentalNodeAllocatableIgnoreEvictionThreshold bool,
	minimumGCAge metav1.Duration,
	maxPerPodContainerCount int32,
	maxContainerCount int32,
	masterServiceNamespace string,
	registerSchedulable bool,
	keepTerminatedPodVolumes bool,
	nodeLabels map[string]string,
	nodeStatusMaxImages int32,
	seccompDefault bool,
) (*Kubelet, error)

NewMainKubelet instantiates a new Kubelet object along with all the required internal modules. No initialization of Kubelet and its modules should happen here.

func (*Kubelet) BirthCry 

func (kl *Kubelet) BirthCry()

BirthCry sends an event that the kubelet has started up.

func (*Kubelet) CheckpointContainer 

func (kl *Kubelet) CheckpointContainer(
	ctx context.Context,
	podUID types.UID,
	podFullName,
	containerName string,
	options *runtimeapi.CheckpointContainerRequest,
) error

CheckpointContainer tries to checkpoint a container. The parameters are used to look up the specified container. If the container specified by the given parameters cannot be found an error is returned. If the container is found the container engine will be asked to checkpoint the given container into the kubelet's default checkpoint directory.

func (*Kubelet) GeneratePodHostNameAndDomain 

func (kl *Kubelet) GeneratePodHostNameAndDomain(pod *v1.Pod) (string, string, error)

GeneratePodHostNameAndDomain creates a hostname and domain name for a pod, given that pod's spec and annotations or returns an error.

func (*Kubelet) GenerateRunContainerOptions 

func (kl *Kubelet) GenerateRunContainerOptions(ctx context.Context, pod *v1.Pod, container *v1.Container, podIP string, podIPs []string) (*kubecontainer.RunContainerOptions, func(), error)

GenerateRunContainerOptions generates the RunContainerOptions, which can be used by the container runtime to set parameters for launching a container.

func (*Kubelet) GetActivePods 

func (kl *Kubelet) GetActivePods() []*v1.Pod

GetActivePods returns pods that have been admitted to the kubelet that are not fully terminated. This is mapped to the "desired state" of the kubelet - what pods should be running.

WARNING: Currently this list does not include pods that have been force deleted but may still be terminating, which means resources assigned to those pods during admission may still be in use. See https://github.com/kubernetes/kubernetes/issues/104824

func (*Kubelet) GetAttach 

func (kl *Kubelet) GetAttach(ctx context.Context, podFullName string, podUID types.UID, containerName string, streamOpts remotecommandserver.Options) (*url.URL, error)

GetAttach gets the URL the attach will be served from, or nil if the Kubelet will serve it.

func (*Kubelet) GetCachedMachineInfo 

func (kl *Kubelet) GetCachedMachineInfo() (*cadvisorapiv1.MachineInfo, error)

GetCachedMachineInfo assumes that the machine info can't change without a reboot

func (*Kubelet) GetCgroupCPUAndMemoryStats 

func (kl *Kubelet) GetCgroupCPUAndMemoryStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, error)

GetCgroupCPUAndMemoryStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) GetCgroupStats 

func (kl *Kubelet) GetCgroupStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, *statsapi.NetworkStats, error)

GetCgroupStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) GetConfiguration 

func (kl *Kubelet) GetConfiguration() kubeletconfiginternal.KubeletConfiguration

GetConfiguration returns the KubeletConfiguration used to configure the kubelet.

func (*Kubelet) GetContainerInfo 

func (kl *Kubelet) GetContainerInfo(ctx context.Context, podFullName string, uid types.UID, containerName string, req *cadvisorapi.ContainerInfoRequest) (*cadvisorapi.ContainerInfo, error)

GetContainerInfo is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) GetExec 

func (kl *Kubelet) GetExec(ctx context.Context, podFullName string, podUID types.UID, containerName string, cmd []string, streamOpts remotecommandserver.Options) (*url.URL, error)

GetExec gets the URL the exec will be served from, or nil if the Kubelet will serve it.

func (*Kubelet) GetExtraSupplementalGroupsForPod 

func (kl *Kubelet) GetExtraSupplementalGroupsForPod(pod *v1.Pod) []int64

GetExtraSupplementalGroupsForPod returns a list of the extra supplemental groups for the Pod. These extra supplemental groups come from annotations on persistent volumes that the pod depends on.

func (*Kubelet) GetHostIPs 

func (kl *Kubelet) GetHostIPs() ([]net.IP, error)

GetHostIPs returns host IPs or nil in case of error.

func (*Kubelet) GetHostname 

func (kl *Kubelet) GetHostname() string

GetHostname Returns the hostname as the kubelet sees it.

func (*Kubelet) GetKubeletContainerLogs 

func (kl *Kubelet) GetKubeletContainerLogs(ctx context.Context, podFullName, containerName string, logOptions *v1.PodLogOptions, stdout, stderr io.Writer) error

GetKubeletContainerLogs returns logs from the container TODO: this method is returning logs of random container attempts, when it should be returning the most recent attempt or all of them.

func (*Kubelet) GetNode 

func (kl *Kubelet) GetNode() (*v1.Node, error)

GetNode returns the node info for the configured node name of this Kubelet.

func (*Kubelet) GetNodeConfig 

func (kl *Kubelet) GetNodeConfig() cm.NodeConfig

GetNodeConfig returns the container manager node config.

func (*Kubelet) GetOrCreateUserNamespaceMappings 

func (kl *Kubelet) GetOrCreateUserNamespaceMappings(pod *v1.Pod) (*runtimeapi.UserNamespace, error)

GetOrCreateUserNamespaceMappings returns the configuration for the sandbox user namespace

func (*Kubelet) GetPodByCgroupfs 

func (kl *Kubelet) GetPodByCgroupfs(cgroupfs string) (*v1.Pod, bool)

GetPodByCgroupfs provides the pod that maps to the specified cgroup, as well as whether the pod was found.

func (*Kubelet) GetPodByFullName 

func (kl *Kubelet) GetPodByFullName(podFullName string) (*v1.Pod, bool)

GetPodByFullName gets the pod with the given 'full' name, which incorporates the namespace as well as whether the pod was found.

func (*Kubelet) GetPodByName 

func (kl *Kubelet) GetPodByName(namespace, name string) (*v1.Pod, bool)

GetPodByName provides the first pod that matches namespace and name, as well as whether the pod was found.

func (*Kubelet) GetPodCgroupParent 

func (kl *Kubelet) GetPodCgroupParent(pod *v1.Pod) string

GetPodCgroupParent gets pod cgroup parent from container manager.

func (*Kubelet) GetPodCgroupRoot 

func (kl *Kubelet) GetPodCgroupRoot() string

GetPodCgroupRoot returns the listeral cgroupfs value for the cgroup containing all pods

func (*Kubelet) GetPodDNS 

func (kl *Kubelet) GetPodDNS(pod *v1.Pod) (*runtimeapi.DNSConfig, error)

GetPodDNS returns DNS settings for the pod. This function is defined in kubecontainer.RuntimeHelper interface so we have to implement it.

func (*Kubelet) GetPodDir 

func (kl *Kubelet) GetPodDir(podUID types.UID) string

GetPodDir returns the full path to the per-pod data directory for the specified pod. This directory may not exist if the pod does not exist.

func (*Kubelet) GetPods 

func (kl *Kubelet) GetPods() []*v1.Pod

GetPods returns all pods bound to the kubelet and their spec, and the mirror pods.

func (*Kubelet) GetPortForward 

func (kl *Kubelet) GetPortForward(ctx context.Context, podName, podNamespace string, podUID types.UID, portForwardOpts portforward.V4Options) (*url.URL, error)

GetPortForward gets the URL the port-forward will be served from, or nil if the Kubelet will serve it.

func (*Kubelet) GetRawContainerInfo 

func (kl *Kubelet) GetRawContainerInfo(containerName string, req *cadvisorapi.ContainerInfoRequest, subcontainers bool) (map[string]*cadvisorapi.ContainerInfo, error)

GetRawContainerInfo is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) GetRequestedContainersInfo 

func (kl *Kubelet) GetRequestedContainersInfo(containerName string, options cadvisorv2.RequestOptions) (map[string]*cadvisorapiv1.ContainerInfo, error)

GetRequestedContainersInfo returns container info.

func (*Kubelet) GetRunningPods 

func (kl *Kubelet) GetRunningPods(ctx context.Context) ([]*v1.Pod, error)

GetRunningPods returns all pods running on kubelet from looking at the container runtime cache. This function converts kubecontainer.Pod to v1.Pod, so only the fields that exist in both kubecontainer.Pod and v1.Pod are considered meaningful.

func (*Kubelet) GetVersionInfo 

func (kl *Kubelet) GetVersionInfo() (*cadvisorapiv1.VersionInfo, error)

GetVersionInfo returns information about the version of cAdvisor in use.

func (*Kubelet) HandlePodAdditions 

func (kl *Kubelet) HandlePodAdditions(pods []*v1.Pod)

HandlePodAdditions is the callback in SyncHandler for pods being added from a config source.

func (*Kubelet) HandlePodCleanups 

func (kl *Kubelet) HandlePodCleanups(ctx context.Context) error

HandlePodCleanups performs a series of cleanup work, including terminating pod workers, killing unwanted pods, and removing orphaned volumes/pod directories. No config changes are sent to pod workers while this method is executing which means no new pods can appear. After this method completes the desired state of the kubelet should be reconciled with the actual state in the pod worker and other pod-related components.

This function is executed by the main sync loop, so it must execute quickly and all nested calls should be asynchronous. Any slow reconciliation actions should be performed by other components (like the volume manager). The duration of this call is the minimum latency for static pods to be restarted if they are updated with a fixed UID (most should use a dynamic UID), and no config updates are delivered to the pod workers while this method is running.

func (*Kubelet) HandlePodReconcile 

func (kl *Kubelet) HandlePodReconcile(pods []*v1.Pod)

HandlePodReconcile is the callback in the SyncHandler interface for pods that should be reconciled.

func (*Kubelet) HandlePodRemoves 

func (kl *Kubelet) HandlePodRemoves(pods []*v1.Pod)

HandlePodRemoves is the callback in the SyncHandler interface for pods being removed from a config source.

func (*Kubelet) HandlePodSyncs 

func (kl *Kubelet) HandlePodSyncs(pods []*v1.Pod)

HandlePodSyncs is the callback in the syncHandler interface for pods that should be dispatched to pod workers for sync.

func (*Kubelet) HandlePodUpdates 

func (kl *Kubelet) HandlePodUpdates(pods []*v1.Pod)

HandlePodUpdates is the callback in the SyncHandler interface for pods being updated from a config source.

func (*Kubelet) ImageFsStats 

func (kl *Kubelet) ImageFsStats(ctx context.Context) (*statsapi.FsStats, error)

ImageFsStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) LatestLoopEntryTime 

func (kl *Kubelet) LatestLoopEntryTime() time.Time

LatestLoopEntryTime returns the last time in the sync loop monitor.

func (*Kubelet) ListBlockVolumesForPod 

func (kl *Kubelet) ListBlockVolumesForPod(podUID types.UID) (map[string]volume.BlockVolume, bool)

ListBlockVolumesForPod returns a map of the mounted volumes for the given pod. The key in the map is the OuterVolumeSpecName (i.e. pod.Spec.Volumes[x].Name)

func (*Kubelet) ListMetricDescriptors 

func (kl *Kubelet) ListMetricDescriptors(ctx context.Context) ([]*runtimeapi.MetricDescriptor, error)

ListMetricDescriptors gets the descriptors for the metrics that will be returned in ListPodSandboxMetrics.

func (*Kubelet) ListPodCPUAndMemoryStats 

func (kl *Kubelet) ListPodCPUAndMemoryStats(ctx context.Context) ([]statsapi.PodStats, error)

ListPodCPUAndMemoryStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) ListPodSandboxMetrics 

func (kl *Kubelet) ListPodSandboxMetrics(ctx context.Context) ([]*runtimeapi.PodSandboxMetrics, error)

ListPodSandboxMetrics retrieves the metrics for all pod sandboxes.

func (*Kubelet) ListPodStats 

func (kl *Kubelet) ListPodStats(ctx context.Context) ([]statsapi.PodStats, error)

ListPodStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) ListPodStatsAndUpdateCPUNanoCoreUsage 

func (kl *Kubelet) ListPodStatsAndUpdateCPUNanoCoreUsage(ctx context.Context) ([]statsapi.PodStats, error)

ListPodStatsAndUpdateCPUNanoCoreUsage is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) ListPodsFromDisk 

func (kl *Kubelet) ListPodsFromDisk() ([]types.UID, error)

ListPodsFromDisk gets a list of pods that have data directories.

func (*Kubelet) ListVolumesForPod 

func (kl *Kubelet) ListVolumesForPod(podUID types.UID) (map[string]volume.Volume, bool)

ListVolumesForPod returns a map of the mounted volumes for the given pod. The key in the map is the OuterVolumeSpecName (i.e. pod.Spec.Volumes[x].Name)

func (*Kubelet) ListenAndServe 

func (kl *Kubelet) ListenAndServe(kubeCfg *kubeletconfiginternal.KubeletConfiguration, tlsOptions *server.TLSOptions,
	auth server.AuthInterface, tp trace.TracerProvider)

ListenAndServe runs the kubelet HTTP server.

func (*Kubelet) ListenAndServePodResources 

func (kl *Kubelet) ListenAndServePodResources()

ListenAndServePodResources runs the kubelet podresources grpc service

func (*Kubelet) ListenAndServeReadOnly 

func (kl *Kubelet) ListenAndServeReadOnly(address net.IP, port uint)

ListenAndServeReadOnly runs the kubelet HTTP server in read-only mode.

func (*Kubelet) PodCouldHaveRunningContainers 

func (kl *Kubelet) PodCouldHaveRunningContainers(pod *v1.Pod) bool

PodCouldHaveRunningContainers returns true if the pod with the given UID could still have running containers. This returns false if the pod has not yet been started or the pod is unknown.

func (*Kubelet) PodIsFinished 

func (kl *Kubelet) PodIsFinished(pod *v1.Pod) bool

PodIsFinished returns true if SyncTerminatedPod is finished, ie. all required node-level resources that a pod was consuming have been reclaimed by the kubelet.

func (*Kubelet) PrepareDynamicResources 

func (kl *Kubelet) PrepareDynamicResources(pod *v1.Pod) error

PrepareDynamicResources calls the container Manager PrepareDynamicResources API This method implements the RuntimeHelper interface

func (*Kubelet) ResyncInterval 

func (kl *Kubelet) ResyncInterval() time.Duration

ResyncInterval returns the interval used for periodic syncs.

func (*Kubelet) RlimitStats 

func (kl *Kubelet) RlimitStats() (*statsapi.RlimitStats, error)

RlimitStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) RootFsStats 

func (kl *Kubelet) RootFsStats() (*statsapi.FsStats, error)

RootFsStats is delegated to StatsProvider, which implements stats.Provider interface

func (*Kubelet) Run 

func (kl *Kubelet) Run(updates <-chan kubetypes.PodUpdate)

Run starts the kubelet reacting to config updates

func (*Kubelet) RunInContainer 

func (kl *Kubelet) RunInContainer(ctx context.Context, podFullName string, podUID types.UID, containerName string, cmd []string) ([]byte, error)

RunInContainer runs a command in a container, returns the combined stdout, stderr as an array of bytes

func (*Kubelet) RunOnce 

func (kl *Kubelet) RunOnce(updates <-chan kubetypes.PodUpdate) ([]RunPodResult, error)

RunOnce polls from one configuration update and run the associated pods.

func (*Kubelet) ServeLogs 

func (kl *Kubelet) ServeLogs(w http.ResponseWriter, req *http.Request)

ServeLogs returns logs of current machine.

func (*Kubelet) StartGarbageCollection 

func (kl *Kubelet) StartGarbageCollection()

StartGarbageCollection starts garbage collection threads.

func (*Kubelet) UnprepareDynamicResources 

func (kl *Kubelet) UnprepareDynamicResources(pod *v1.Pod) error

UnprepareDynamicResources calls the container Manager UnprepareDynamicResources API This method implements the RuntimeHelper interface

type OnCompleteFunc 

type OnCompleteFunc func(err error)

OnCompleteFunc is a function that is invoked when an operation completes. If err is non-nil, the operation did not complete successfully.

type Option 

type Option func(*Kubelet)

Option is a functional option type for Kubelet

type PodStatusFunc 

type PodStatusFunc func(podStatus *v1.PodStatus)

PodStatusFunc is a function that is invoked to override the pod status when a pod is killed.

type PodWorkType 

type PodWorkType int

PodWorkType classifies the three phases of pod lifecycle - setup (sync), teardown of containers (terminating), cleanup (terminated). 

const (
	// SyncPodWork is when the pod is expected to be started and running.
	SyncPodWork PodWorkType = iota
	// TerminatingPodWork is when the pod is no longer being set up, but some
	// containers may be running and are being torn down.
	TerminatingPodWork
	// TerminatedPodWork indicates the pod is stopped, can have no more running
	// containers, and any foreground cleanup can be executed.
	TerminatedPodWork
)

type PodWorkerState 

type PodWorkerState int

PodWorkType classifies the status of pod as seen by the pod worker - setup (sync), teardown of containers (terminating), cleanup (terminated), or recreated with the same UID (kill -> create while terminating) 

const (
	// SyncPod is when the pod is expected to be started and running.
	SyncPod PodWorkerState = iota
	// TerminatingPod is when the pod is no longer being set up, but some
	// containers may be running and are being torn down.
	TerminatingPod
	// TerminatedPod indicates the pod is stopped, can have no more running
	// containers, and any foreground cleanup can be executed.
	TerminatedPod
	// TerminatedAndRecreatedPod indicates that after the pod was terminating a
	// request to recreate the pod was received. The pod is terminated and can
	// now be restarted by sending a create event to the pod worker.
	TerminatedAndRecreatedPod
)

type PodWorkers 

type PodWorkers interface {
	// UpdatePod notifies the pod worker of a change to a pod, which will then
	// be processed in FIFO order by a goroutine per pod UID. The state of the
	// pod will be passed to the syncPod method until either the pod is marked
	// as deleted, it reaches a terminal phase (Succeeded/Failed), or the pod
	// is evicted by the kubelet. Once that occurs the syncTerminatingPod method
	// will be called until it exits successfully, and after that all further
	// UpdatePod() calls will be ignored for that pod until it has been forgotten
	// due to significant time passing. A pod that is terminated will never be
	// restarted.
	UpdatePod(options UpdatePodOptions)
	// SyncKnownPods removes workers for pods that are not in the desiredPods set
	// and have been terminated for a significant period of time. Once this method
	// has been called once, the workers are assumed to be fully initialized and
	// subsequent calls to ShouldPodContentBeRemoved on unknown pods will return
	// true. It returns a map describing the state of each known pod worker.
	SyncKnownPods(desiredPods []*v1.Pod) map[types.UID]PodWorkerState

	// IsPodKnownTerminated returns true if the provided pod UID is known by the pod
	// worker to be terminated. If the pod has been force deleted and the pod worker
	// has completed termination this method will return false, so this method should
	// only be used to filter out pods from the desired set such as in admission.
	//
	// Intended for use by the kubelet config loops, but not subsystems, which should
	// use ShouldPod*().
	IsPodKnownTerminated(uid types.UID) bool
	// CouldHaveRunningContainers returns true before the pod workers have synced,
	// once the pod workers see the pod (syncPod could be called), and returns false
	// after the pod has been terminated (running containers guaranteed stopped).
	//
	// Intended for use by the kubelet config loops, but not subsystems, which should
	// use ShouldPod*().
	CouldHaveRunningContainers(uid types.UID) bool
	// IsPodTerminationRequested returns true when pod termination has been requested
	// until the termination completes and the pod is removed from config. This should
	// not be used in cleanup loops because it will return false if the pod has already
	// been cleaned up - use ShouldPodContainersBeTerminating instead. Also, this method
	// may return true while containers are still being initialized by the pod worker.
	//
	// Intended for use by the kubelet sync* methods, but not subsystems, which should
	// use ShouldPod*().
	IsPodTerminationRequested(uid types.UID) bool

	// ShouldPodContainersBeTerminating returns false before pod workers have synced,
	// or once a pod has started terminating. This check is similar to
	// ShouldPodRuntimeBeRemoved but is also true after pod termination is requested.
	//
	// Intended for use by subsystem sync loops to avoid performing background setup
	// after termination has been requested for a pod. Callers must ensure that the
	// syncPod method is non-blocking when their data is absent.
	ShouldPodContainersBeTerminating(uid types.UID) bool
	// ShouldPodRuntimeBeRemoved returns true if runtime managers within the Kubelet
	// should aggressively cleanup pod resources that are not containers or on disk
	// content, like attached volumes. This is true when a pod is not yet observed
	// by a worker after the first sync (meaning it can't be running yet) or after
	// all running containers are stopped.
	// TODO: Once pod logs are separated from running containers, this method should
	// be used to gate whether containers are kept.
	//
	// Intended for use by subsystem sync loops to know when to start tearing down
	// resources that are used by running containers. Callers should ensure that
	// runtime content they own is not required for post-termination - for instance
	// containers are required in docker to preserve pod logs until after the pod
	// is deleted.
	ShouldPodRuntimeBeRemoved(uid types.UID) bool
	// ShouldPodContentBeRemoved returns true if resource managers within the Kubelet
	// should aggressively cleanup all content related to the pod. This is true
	// during pod eviction (when we wish to remove that content to free resources)
	// as well as after the request to delete a pod has resulted in containers being
	// stopped (which is a more graceful action). Note that a deleting pod can still
	// be evicted.
	//
	// Intended for use by subsystem sync loops to know when to start tearing down
	// resources that are used by non-deleted pods. Content is generally preserved
	// until deletion+removal_from_etcd or eviction, although garbage collection
	// can free content when this method returns false.
	ShouldPodContentBeRemoved(uid types.UID) bool
	// IsPodForMirrorPodTerminatingByFullName returns true if a static pod with the
	// provided pod name is currently terminating and has yet to complete. It is
	// intended to be used only during orphan mirror pod cleanup to prevent us from
	// deleting a terminating static pod from the apiserver before the pod is shut
	// down.
	IsPodForMirrorPodTerminatingByFullName(podFullname string) bool
}

PodWorkers is an abstract interface for testability.

type ReasonCache 

type ReasonCache struct {
	// contains filtered or unexported fields
}

ReasonCache stores the failure reason of the latest container start in a string, keyed by <pod_UID>_<container_name>. The goal is to propagate this reason to the container status. This endeavor is "best-effort" for two reasons:

  1. The cache is not persisted.
  2. We use an LRU cache to avoid extra garbage collection work. This means that some entries may be recycled before a pod has been deleted.

TODO(random-liu): Use more reliable cache which could collect garbage of failed pod. TODO(random-liu): Move reason cache to somewhere better.

func NewReasonCache 

func NewReasonCache() *ReasonCache

NewReasonCache creates an instance of 'ReasonCache'.

func (*ReasonCache) Get 

func (c *ReasonCache) Get(uid types.UID, name string) (*ReasonItem, bool)

Get gets error reason from the cache. The return values are error reason, error message and whether an error reason is found in the cache. If no error reason is found, empty string will be returned for error reason and error message.

func (*ReasonCache) Remove 

func (c *ReasonCache) Remove(uid types.UID, name string)

Remove removes error reason from the cache

func (*ReasonCache) Update 

func (c *ReasonCache) Update(uid types.UID, result kubecontainer.PodSyncResult)

Update updates the reason cache with the SyncPodResult. Only SyncResult with StartContainer action will change the cache.

type ReasonItem 

type ReasonItem struct {
	Err     error
	Message string
}

ReasonItem is the cached item in ReasonCache

type RunPodResult 

type RunPodResult struct {
	Pod *v1.Pod
	Err error
}

RunPodResult defines the running results of a Pod.

type SyncHandler 

type SyncHandler interface {
	HandlePodAdditions(pods []*v1.Pod)
	HandlePodUpdates(pods []*v1.Pod)
	HandlePodRemoves(pods []*v1.Pod)
	HandlePodReconcile(pods []*v1.Pod)
	HandlePodSyncs(pods []*v1.Pod)
	HandlePodCleanups(ctx context.Context) error
}

SyncHandler is an interface implemented by Kubelet, for testability

type UpdatePodOptions 

type UpdatePodOptions struct {
	// The type of update (create, update, sync, kill).
	UpdateType kubetypes.SyncPodType
	// StartTime is an optional timestamp for when this update was created. If set,
	// when this update is fully realized by the pod worker it will be recorded in
	// the PodWorkerDuration metric.
	StartTime time.Time
	// Pod to update. Required.
	Pod *v1.Pod
	// MirrorPod is the mirror pod if Pod is a static pod. Optional when UpdateType
	// is kill or terminated.
	MirrorPod *v1.Pod
	// RunningPod is a runtime pod that is no longer present in config. Required
	// if Pod is nil, ignored if Pod is set.
	RunningPod *kubecontainer.Pod
	// KillPodOptions is used to override the default termination behavior of the
	// pod or to update the pod status after an operation is completed. Since a
	// pod can be killed for multiple reasons, PodStatusFunc is invoked in order
	// and later kills have an opportunity to override the status (i.e. a preemption
	// may be later turned into an eviction).
	KillPodOptions *KillPodOptions
}

UpdatePodOptions is an options struct to pass to a UpdatePod operation.

Source Files

View all Source files

Directories

Path Synopsis
apis
config
config/v1
config/v1beta1
podresources
testing
certificate
bootstrap
cm
devicemanager/plugin/v1beta1
pluginmanager
cache
Package cache implements data structures used by the kubelet plugin manager to keep track of registered plugins.
 Package cache implements data structures used by the kubelet plugin manager to keep track of registered plugins.
pluginwatcher/example_plugin_apis/v1beta1
pluginwatcher/example_plugin_apis/v1beta2
manager
volumemanager
cache
Package cache implements data structures used by the kubelet volume manager to keep track of attached volumes and the pods that mounted them.
 Package cache implements data structures used by the kubelet volume manager to keep track of attached volumes and the pods that mounted them.

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