pod

Documentation

Index

• func IsMirrorPod(pod *api.Pod) bool
• func IsStaticPod(pod *api.Pod) bool
• type Manager
  • func NewBasicPodManager(client MirrorClient) Manager
• type MirrorClient
  • func NewBasicMirrorClient(apiserverClient clientset.Interface) MirrorClient

Functions

func IsMirrorPod

func IsMirrorPod(pod *api.Pod) bool

func IsStaticPod

func IsStaticPod(pod *api.Pod) bool

Types

type Manager

type Manager interface {
	// GetPods returns the regular pods bound to the kubelet and their spec.
	GetPods() []*api.Pod
	// GetPodByName returns the (non-mirror) pod that matches full name, as well as
	// whether the pod was found.
	GetPodByFullName(podFullName string) (*api.Pod, bool)
	// GetPodByName provides the (non-mirror) pod that matches namespace and
	// name, as well as whether the pod was found.
	GetPodByName(namespace, name string) (*api.Pod, bool)
	// GetPodByUID provides the (non-mirror) pod that matches pod UID, as well as
	// whether the pod is found.
	GetPodByUID(types.UID) (*api.Pod, bool)
	// GetPodByMirrorPod returns the static pod for the given mirror pod and
	// whether it was known to the pod manger.
	GetPodByMirrorPod(*api.Pod) (*api.Pod, bool)
	// GetMirrorPodByPod returns the mirror pod for the given static pod and
	// whether it was known to the pod manager.
	GetMirrorPodByPod(*api.Pod) (*api.Pod, bool)
	// GetPodsAndMirrorPods returns the both regular and mirror pods.
	GetPodsAndMirrorPods() ([]*api.Pod, []*api.Pod)
	// SetPods replaces the internal pods with the new pods.
	// It is currently only used for testing.
	SetPods(pods []*api.Pod)
	// AddPod adds the given pod to the manager.
	AddPod(pod *api.Pod)
	// UpdatePod updates the given pod in the manager.
	UpdatePod(pod *api.Pod)
	// DeletePod deletes the given pod from the manager.  For mirror pods,
	// this means deleting the mappings related to mirror pods.  For non-
	// mirror pods, this means deleting from indexes for all non-mirror pods.
	DeletePod(pod *api.Pod)
	// DeleteOrphanedMirrorPods deletes all mirror pods which do not have
	// associated static pods. This method sends deletion requests to the API
	// server, but does NOT modify the internal pod storage in basicManager.
	DeleteOrphanedMirrorPods()
	// TranslatePodUID returns the UID which is the mirror pod or static pod
	// of the pod with the given UID.  If the UID belongs to a mirror pod,
	// returns the UID of its static pod.  If the UID belongs to a static pod,
	// returns the UID of its mirror pod.  Otherwise, returns the original UID.
	//
	// All public-facing functions should perform this translation for UIDs
	// because user may provide a mirror pod UID, which is not recognized by
	// internal Kubelet functions.
	TranslatePodUID(uid types.UID) types.UID
	// GetUIDTranslations returns the mappings of static pod UIDs to mirror pod
	// UIDs and mirror pod UIDs to static pod UIDs.
	GetUIDTranslations() (podToMirror, mirrorToPod map[types.UID]types.UID)
	// IsMirrorPodOf returns true if mirrorPod is a correct representation of
	// pod; false otherwise.
	IsMirrorPodOf(mirrorPod, pod *api.Pod) bool

	MirrorClient
}

Manager stores and manages access to pods, maintaining the mappings between static pods and mirror pods.

The kubelet discovers pod updates from 3 sources: file, http, and apiserver. Pods from non-apiserver sources are called static pods, and API server is not aware of the existence of static pods. In order to monitor the status of such pods, the kubelet creates a mirror pod for each static pod via the API server.

A mirror pod has the same pod full name (name and namespace) as its static counterpart (albeit different metadata such as UID, etc). By leveraging the fact that the kubelet reports the pod status using the pod full name, the status of the mirror pod always reflects the actual status of the static pod. When a static pod gets deleted, the associated orphaned mirror pod will also be removed.

func NewBasicPodManager

func NewBasicPodManager(client MirrorClient) Manager

NewBasicPodManager returns a functional Manager.

type MirrorClient

type MirrorClient interface {
	// CreateMirrorPod creates a mirror pod in the API server for the given
	// pod or returns an error.  The mirror pod will have the same annotations
	// as the given pod as well as an extra annotation containing the hash of
	// the static pod.
	CreateMirrorPod(pod *api.Pod) error
	// DeleteMirrorPod deletes the mirror pod with the given full name from
	// the API server or returns an error.
	DeleteMirrorPod(podFullName string) error
}

MirrorClient knows how to create/delete a mirror pod in the API server.

func NewBasicMirrorClient

func NewBasicMirrorClient(apiserverClient clientset.Interface) MirrorClient

NewBasicMirrorClient returns a new MirrorClient.