kubelet

package
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Published: Jan 15, 2020 License: Apache-2.0 Imports: 79 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 (

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

	// system default DNS resolver configuration
	ResolvConfDefault = "/etc/resolv.conf"
)

Variables

This section is empty.

Functions

func GetPhase

func GetPhase(spec *api.PodSpec, info []api.ContainerStatus) api.PodPhase

GetPhase returns the phase of a pod given its container info. This func is exported to simplify integration with 3rd party kubelet integrations like kubernetes-mesos.

Types

type DiskSpacePolicy

type DiskSpacePolicy struct {
	// free disk space threshold for filesystem holding docker images.
	DockerFreeDiskMB int
	// free disk space threshold for root filesystem. Host volumes are created on root fs.
	RootFreeDiskMB int
}

type FlannelHelper

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

A Kubelet to flannel bridging helper.

func NewFlannelHelper

func NewFlannelHelper() *FlannelHelper

NewFlannelHelper creates a new flannel helper.

func (*FlannelHelper) Handshake

func (f *FlannelHelper) Handshake() (podCIDR string, err error)

Handshake waits for the flannel subnet file and installs a few IPTables rules, returning the pod CIDR allocated for this node.

type ImageGCPolicy

type ImageGCPolicy struct {
	// Any usage above this threshold will always trigger garbage collection.
	// This is the highest usage we will allow.
	HighThresholdPercent int

	// Any usage below this threshold will never trigger garbage collection.
	// This is the lowest threshold we will try to garbage collect to.
	LowThresholdPercent int
}

A policy for garbage collecting images. Policy defines an allowed band in which garbage collection will be run.

type Kubelet

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

Kubelet is the main kubelet implementation.

func NewMainKubelet

func NewMainKubelet(
	hostname string,
	nodeName string,
	dockerClient dockertools.DockerInterface,
	kubeClient client.Interface,
	rootDirectory string,
	podInfraContainerImage string,
	resyncInterval time.Duration,
	pullQPS float32,
	pullBurst int,
	eventQPS float32,
	eventBurst int,
	containerGCPolicy kubecontainer.ContainerGCPolicy,
	sourcesReady SourcesReadyFn,
	registerNode bool,
	registerSchedulable bool,
	standaloneMode bool,
	clusterDomain string,
	clusterDNS net.IP,
	masterServiceNamespace string,
	volumePlugins []volume.VolumePlugin,
	networkPlugins []network.NetworkPlugin,
	networkPluginName string,
	streamingConnectionIdleTimeout time.Duration,
	recorder record.EventRecorder,
	cadvisorInterface cadvisor.Interface,
	imageGCPolicy ImageGCPolicy,
	diskSpacePolicy DiskSpacePolicy,
	cloud cloudprovider.Interface,
	nodeLabels []string,
	nodeLabelsFile string,
	nodeStatusUpdateFrequency time.Duration,
	resourceContainer string,
	osInterface kubecontainer.OSInterface,
	cgroupRoot string,
	containerRuntime string,
	rktPath string,
	rktStage1Image string,
	mounter mount.Interface,
	writer kubeio.Writer,
	chownRunner chown.Interface,
	chmodRunner chmod.Interface,
	dockerDaemonContainer string,
	systemContainer string,
	configureCBR0 bool,
	podCIDR string,
	reconcileCIDR bool,
	maxPods int,
	dockerExecHandler dockertools.ExecHandler,
	resolverConfig string,
	cpuCFSQuota bool,
	daemonEndpoints *api.NodeDaemonEndpoints,
	oomAdjuster *oom.OOMAdjuster,
	serializeImagePulls bool,
	containerManager cm.ContainerManager,
	flannelExperimentalOverlay bool,
) (*Kubelet, error)

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

func (*Kubelet) AttachContainer

func (kl *Kubelet) AttachContainer(podFullName string, podUID types.UID, containerName string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error

func (*Kubelet) BirthCry

func (kl *Kubelet) BirthCry()

BirthCry sends an event that the kubelet has started up.

func (*Kubelet) ExecInContainer

func (kl *Kubelet) ExecInContainer(podFullName string, podUID types.UID, containerName string, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error

ExecInContainer executes a command in a container, connecting the supplied stdin/stdout/stderr to the command's IO streams.

func (*Kubelet) GenerateRunContainerOptions

func (kl *Kubelet) GenerateRunContainerOptions(pod *api.Pod, container *api.Container) (*kubecontainer.RunContainerOptions, error)

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

func (*Kubelet) GetCachedMachineInfo

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

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

func (*Kubelet) GetContainerInfo

func (kl *Kubelet) GetContainerInfo(podFullName string, podUID types.UID, containerName string, req *cadvisorapi.ContainerInfoRequest) (*cadvisorapi.ContainerInfo, error)

GetContainerInfo returns stats (from Cadvisor) for a container.

func (*Kubelet) GetContainerRuntimeVersion

func (kl *Kubelet) GetContainerRuntimeVersion() (kubecontainer.Version, error)

Returns the container runtime version for this Kubelet.

func (*Kubelet) GetHostIP

func (kl *Kubelet) GetHostIP() (net.IP, error)

Returns host IP 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(podFullName, containerName string, logOptions *api.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() (*api.Node, error)

func (*Kubelet) GetPodByFullName

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

func (*Kubelet) GetPodByName

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

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

func (*Kubelet) GetPods

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

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

func (*Kubelet) GetRawContainerInfo

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

Returns stats (from Cadvisor) for a non-Kubernetes container.

func (*Kubelet) GetRunningPods

func (kl *Kubelet) GetRunningPods() ([]*api.Pod, error)

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

func (*Kubelet) GetRuntime

func (kl *Kubelet) GetRuntime() kubecontainer.Runtime

GetRuntime returns the current Runtime implementation in use by the kubelet. This func is exported to simplify integration with third party kubelet extensions (e.g. kubernetes-mesos).

func (*Kubelet) HandlePodAdditions

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

func (*Kubelet) HandlePodCleanups

func (kl *Kubelet) HandlePodCleanups() error

HandlePodCleanups performs a series of cleanup work, including terminating pod workers, killing unwanted pods, and removing orphaned volumes/pod directories. TODO(yujuhong): This function is executed by the main sync loop, so it should not contain any blocking calls. Re-examine the function and decide whether or not we should move it into a separte goroutine.

func (*Kubelet) HandlePodDeletions

func (kl *Kubelet) HandlePodDeletions(pods []*api.Pod)

func (*Kubelet) HandlePodSyncs

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

func (*Kubelet) HandlePodUpdates

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

func (*Kubelet) LatestLoopEntryTime

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

func (*Kubelet) ListenAndServe

func (kl *Kubelet) ListenAndServe(address net.IP, port uint, tlsOptions *server.TLSOptions, auth server.AuthInterface, enableDebuggingHandlers bool)

func (*Kubelet) ListenAndServeReadOnly

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

func (*Kubelet) PortForward

func (kl *Kubelet) PortForward(podFullName string, podUID types.UID, port uint16, stream io.ReadWriteCloser) error

PortForward connects to the pod's port and copies data between the port and the stream.

func (*Kubelet) ResyncInterval

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

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(podFullName string, podUID types.UID, containerName string, cmd []string) ([]byte, error)

Run 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)

Returns logs of current machine.

func (*Kubelet) StartGarbageCollection

func (kl *Kubelet) StartGarbageCollection()

Starts garbage collection threads.

func (*Kubelet) StreamingConnectionIdleTimeout

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

type OOMWatcher

type OOMWatcher interface {
	Start(ref *api.ObjectReference) error
}

func NewOOMWatcher

func NewOOMWatcher(cadvisor cadvisor.Interface, recorder record.EventRecorder) OOMWatcher

type PodWorkers

type PodWorkers interface {
	UpdatePod(pod *api.Pod, mirrorPod *api.Pod, updateType kubetypes.SyncPodType, updateComplete func())
	ForgetNonExistingPodWorkers(desiredPods map[types.UID]empty)
	ForgetWorker(uid types.UID)
}

PodWorkers is an abstract interface for testability.

type RunPodResult

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

type SourcesReadyFn

type SourcesReadyFn func(sourcesSeen sets.String) bool

type SyncHandler

type SyncHandler interface {
	HandlePodAdditions(pods []*api.Pod)
	HandlePodUpdates(pods []*api.Pod)
	HandlePodDeletions(pods []*api.Pod)
	HandlePodSyncs(pods []*api.Pod)
	HandlePodCleanups() error
}

SyncHandler is an interface implemented by Kubelet, for testability

type TestingInterface

type TestingInterface interface {
	Errorf(format string, args ...interface{})
}

Directories

Path Synopsis
Kubelet interactions with cAdvisor.
Kubelet interactions with cAdvisor.
Reads the pod configuration from the Kubernetes apiserver.
Reads the pod configuration from the Kubernetes apiserver.
Package envvars is the package that build the environment variables that kubernetes provides to the containers run by it.
Package envvars is the package that build the environment variables that kubernetes provides to the containers run by it.
Package leaky holds bits of kubelet that should be internal but have leaked out through bad abstractions.
Package leaky holds bits of kubelet that should be internal but have leaked out through bad abstractions.
Handlers for pod lifecycle events.
Handlers for pod lifecycle events.
cni
exec
Package exec scans and loads networking plugins that are installed under /usr/libexec/kubernetes/kubelet-plugins/net/exec/ The layout convention for a plugin is:
Package exec scans and loads networking plugins that are installed under /usr/libexec/kubernetes/kubelet-plugins/net/exec/ The layout convention for a plugin is:
Package pleg contains types and a generic implementation of the pod lifecycle event generator.
Package pleg contains types and a generic implementation of the pod lifecycle event generator.
qos
package qos contains helper functions for quality of service.
package qos contains helper functions for quality of service.
Package rkt contains the Containerruntime interface implementation for rkt.
Package rkt contains the Containerruntime interface implementation for rkt.
Package server contains functions related to serving Kubelet's external interface.
Package server contains functions related to serving Kubelet's external interface.
portforward
package portforward contains server-side logic for handling port forwarding requests.
package portforward contains server-side logic for handling port forwarding requests.
stats
Package stats handles exporting Kubelet and container stats.
Package stats handles exporting Kubelet and container stats.
Common types in the Kubelet.
Common types in the Kubelet.
Utility functions.
Utility functions.

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