volumemanager

package
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Published: Jan 7, 2017 License: Apache-2.0 Imports: 19 Imported by: 0

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Types

type VolumeManager

type VolumeManager interface {
	// Starts the volume manager and all the asynchronous loops that it controls
	Run(stopCh <-chan struct{})

	// WaitForAttachAndMount processes the volumes referenced in the specified
	// pod and blocks until they are all attached and mounted (reflected in
	// actual state of the world).
	// An error is returned if all volumes are not attached and mounted within
	// the duration defined in podAttachAndMountTimeout.
	WaitForAttachAndMount(pod *api.Pod) error

	// GetMountedVolumesForPod returns a VolumeMap containing the volumes
	// referenced by the specified pod that are successfully attached and
	// mounted. The key in the map is the OuterVolumeSpecName (i.e.
	// pod.Spec.Volumes[x].Name). It returns an empty VolumeMap if pod has no
	// volumes.
	GetMountedVolumesForPod(podName types.UniquePodName) container.VolumeMap

	// GetVolumesForPodAndApplySupplementalGroups, like GetVolumesForPod returns
	// a VolumeMap containing the volumes referenced by the specified pod that
	// are successfully attached and mounted. The key in the map is the
	// OuterVolumeSpecName (i.e. pod.Spec.Volumes[x].Name).
	// It returns an empty VolumeMap if pod has no volumes.
	// In addition for every volume that specifies a VolumeGidValue, it appends
	// the SecurityContext.SupplementalGroups for the specified pod.
	// XXX: https://github.com/kubernetes/kubernetes/issues/27197 mutating the
	// pod object is bad, and should be avoided.
	GetVolumesForPodAndAppendSupplementalGroups(pod *api.Pod) container.VolumeMap

	// Returns a list of all volumes that implement the volume.Attacher
	// interface and are currently in use according to the actual and desired
	// state of the world caches. A volume is considered "in use" as soon as it
	// is added to the desired state of world, indicating it *should* be
	// attached to this node and remains "in use" until it is removed from both
	// the desired state of the world and the actual state of the world, or it
	// has been unmounted (as indicated in actual state of world).
	// TODO(#27653): VolumesInUse should be handled gracefully on kubelet'
	// restarts.
	GetVolumesInUse() []api.UniqueVolumeName

	// VolumeIsAttached returns true if the given volume is attached to this
	// node.
	VolumeIsAttached(volumeName api.UniqueVolumeName) bool

	// Marks the specified volume as having successfully been reported as "in
	// use" in the nodes's volume status.
	MarkVolumesAsReportedInUse(volumesReportedAsInUse []api.UniqueVolumeName)
}

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.

func NewVolumeManager

func NewVolumeManager(
	controllerAttachDetachEnabled bool,
	hostName string,
	podManager pod.Manager,
	kubeClient internalclientset.Interface,
	volumePluginMgr *volume.VolumePluginMgr,
	kubeContainerRuntime kubecontainer.Runtime) (VolumeManager, error)

NewVolumeManager returns a new concrete instance implementing the VolumeManager interface.

kubeClient - kubeClient is the kube API client used by DesiredStateOfWorldPopulator

to communicate with the API server to fetch PV and PVC objects

volumePluginMgr - the volume plugin manager used to access volume plugins.

Must be pre-initialized.

Directories

Path Synopsis
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.
Package populator implements interfaces that monitor and keep the states of the caches in sync with the "ground truth".
Package populator implements interfaces that monitor and keep the states of the caches in sync with the "ground truth".
Package reconciler implements interfaces that attempt to reconcile the desired state of the with the actual state of the world by triggering relevant actions (attach, detach, mount, unmount).
Package reconciler implements interfaces that attempt to reconcile the desired state of the with the actual state of the world by triggering relevant actions (attach, detach, mount, unmount).

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