volume

Documentation

Overview

Package volume includes internal representations of external volume types as well as utility methods required to mount/unmount volumes to kubelets.

Index

• func GetAccessModesAsString(modes []api.PersistentVolumeAccessMode) string
• func NewFakeVolumeHost(rootDir string, kubeClient client.Interface, plugins []VolumePlugin) *fakeVolumeHost
• func RenameDirectory(oldPath, newName string) (string, error)
• func ScrubPodVolumeAndWatchUntilCompletion(pod *api.Pod, kubeClient client.Interface) error
• type Builder
• type Cleaner
• type FakeRecycler
  • func (fr *FakeRecycler) GetPath() string
  • func (fr *FakeRecycler) Recycle() error
• type FakeVolume
  • func (fv *FakeVolume) GetPath() string
  • func (fv *FakeVolume) SetUp() error
  • func (fv *FakeVolume) SetUpAt(dir string) error
  • func (fv *FakeVolume) TearDown() error
  • func (fv *FakeVolume) TearDownAt(dir string) error
• type FakeVolumePlugin
  • func (plugin *FakeVolumePlugin) CanSupport(spec *Spec) bool
  • func (plugin *FakeVolumePlugin) GetAccessModes() []api.PersistentVolumeAccessMode
  • func (plugin *FakeVolumePlugin) Init(host VolumeHost)
  • func (plugin *FakeVolumePlugin) Name() string
  • func (plugin *FakeVolumePlugin) NewBuilder(spec *Spec, pod *api.Pod, opts VolumeOptions, mounter mount.Interface) (Builder, error)
  • func (plugin *FakeVolumePlugin) NewCleaner(volName string, podUID types.UID, mounter mount.Interface) (Cleaner, error)
  • func (plugin *FakeVolumePlugin) NewRecycler(spec *Spec) (Recycler, error)
• type PersistentVolumePlugin
• type RecyclableVolumePlugin
• type Recycler
• type Spec
  • func NewSpecFromPersistentVolume(pv *api.PersistentVolume) *Spec
  • func NewSpecFromVolume(vs *api.Volume) *Spec
• type Volume
• type VolumeHost
• type VolumeOptions
• type VolumePlugin
• type VolumePluginMgr
  • func (pm *VolumePluginMgr) FindPersistentPluginByName(name string) (PersistentVolumePlugin, error)
  • func (pm *VolumePluginMgr) FindPersistentPluginBySpec(spec *Spec) (PersistentVolumePlugin, error)
  • func (pm *VolumePluginMgr) FindPluginByName(name string) (VolumePlugin, error)
  • func (pm *VolumePluginMgr) FindPluginBySpec(spec *Spec) (VolumePlugin, error)
  • func (pm *VolumePluginMgr) FindRecyclablePluginBySpec(spec *Spec) (RecyclableVolumePlugin, error)
  • func (pm *VolumePluginMgr) InitPlugins(plugins []VolumePlugin, host VolumeHost) error

Functions

func GetAccessModesAsString

func GetAccessModesAsString(modes []api.PersistentVolumeAccessMode) string

func NewFakeVolumeHost

func NewFakeVolumeHost(rootDir string, kubeClient client.Interface, plugins []VolumePlugin) *fakeVolumeHost

func RenameDirectory

func RenameDirectory(oldPath, newName string) (string, error)

func ScrubPodVolumeAndWatchUntilCompletion

func ScrubPodVolumeAndWatchUntilCompletion(pod *api.Pod, kubeClient client.Interface) error

ScrubPodVolumeAndWatchUntilCompletion is intended for use with volume Recyclers. This function will save the given Pod to the API and watch it until it completes, fails, or the pod's ActiveDeadlineSeconds is exceeded, whichever comes first. An attempt to delete a scrubber pod is always attempted before returning.

pod - the pod designed by a volume plugin to scrub the volume's contents
client - kube client for API operations.

Types

type Builder

type Builder interface {
	// Uses Interface to provide the path for Docker binds.
	Volume
	// SetUp prepares and mounts/unpacks the volume to a self-determined
	// directory path.  This may be called more than once, so
	// implementations must be idempotent.
	SetUp() error
	// SetUpAt prepares and mounts/unpacks the volume to the specified
	// directory path, which may or may not exist yet.  This may be called
	// more than once, so implementations must be idempotent.
	SetUpAt(dir string) error
}

Builder interface provides methods to set up/mount the volume.

type Cleaner

type Cleaner interface {
	Volume
	// TearDown unmounts the volume from a self-determined directory and
	// removes traces of the SetUp procedure.
	TearDown() error
	// TearDown unmounts the volume from the specified directory and
	// removes traces of the SetUp procedure.
	TearDownAt(dir string) error
}

Cleaner interface provides methods to cleanup/unmount the volumes.

type FakeRecycler

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

func (*FakeRecycler) GetPath

func (fr *FakeRecycler) GetPath() string

func (*FakeRecycler) Recycle

func (fr *FakeRecycler) Recycle() error

type FakeVolume

type FakeVolume struct {
	PodUID  types.UID
	VolName string
	Plugin  *FakeVolumePlugin
}

func (*FakeVolume) GetPath

func (fv *FakeVolume) GetPath() string

func (*FakeVolume) SetUp

func (fv *FakeVolume) SetUp() error

func (*FakeVolume) SetUpAt

func (fv *FakeVolume) SetUpAt(dir string) error

func (*FakeVolume) TearDown

func (fv *FakeVolume) TearDown() error

func (*FakeVolume) TearDownAt

func (fv *FakeVolume) TearDownAt(dir string) error

type FakeVolumePlugin

type FakeVolumePlugin struct {
	PluginName string
	Host       VolumeHost
}

FakeVolumePlugin is useful for testing. It tries to be a fully compliant plugin, but all it does is make empty directories. Use as:

volume.RegisterPlugin(&FakePlugin{"fake-name"})

func (*FakeVolumePlugin) CanSupport

func (plugin *FakeVolumePlugin) CanSupport(spec *Spec) bool

func (*FakeVolumePlugin) GetAccessModes

func (plugin *FakeVolumePlugin) GetAccessModes() []api.PersistentVolumeAccessMode

func (*FakeVolumePlugin) Init

func (plugin *FakeVolumePlugin) Init(host VolumeHost)

func (*FakeVolumePlugin) Name

func (plugin *FakeVolumePlugin) Name() string

func (*FakeVolumePlugin) NewBuilder

func (plugin *FakeVolumePlugin) NewBuilder(spec *Spec, pod *api.Pod, opts VolumeOptions, mounter mount.Interface) (Builder, error)

func (*FakeVolumePlugin) NewCleaner

func (plugin *FakeVolumePlugin) NewCleaner(volName string, podUID types.UID, mounter mount.Interface) (Cleaner, error)

func (*FakeVolumePlugin) NewRecycler

func (plugin *FakeVolumePlugin) NewRecycler(spec *Spec) (Recycler, error)

type PersistentVolumePlugin

type PersistentVolumePlugin interface {
	VolumePlugin
	// GetAccessModes describes the ways a given volume can be accessed/mounted.
	GetAccessModes() []api.PersistentVolumeAccessMode
}

PersistentVolumePlugin is an extended interface of VolumePlugin and is used by volumes that want to provide long term persistence of data

type RecyclableVolumePlugin

type RecyclableVolumePlugin interface {
	VolumePlugin
	// NewRecycler creates a new volume.Recycler which knows how to reclaim this resource
	// after the volume's release from a PersistentVolumeClaim
	NewRecycler(spec *Spec) (Recycler, error)
}

RecyclableVolumePlugin is an extended interface of VolumePlugin and is used by persistent volumes that want to be recycled before being made available again to new claims

type Recycler

type Recycler interface {
	Volume
	// Recycle reclaims the resource.  Calls to this method should block until the recycling task is complete.
	// Any error returned indicates the volume has failed to be reclaimed.  A nil return indicates success.
	Recycle() error
}

Recycler provides methods to reclaim the volume resource.

type Spec

type Spec struct {
	Name                   string
	VolumeSource           api.VolumeSource
	PersistentVolumeSource api.PersistentVolumeSource
}

Spec is an internal representation of a volume. All API volume types translate to Spec.

func NewSpecFromPersistentVolume

func NewSpecFromPersistentVolume(pv *api.PersistentVolume) *Spec

NewSpecFromPersistentVolume creates an Spec from an api.PersistentVolume

func NewSpecFromVolume

func NewSpecFromVolume(vs *api.Volume) *Spec

NewSpecFromVolume creates an Spec from an api.Volume

type Volume

type Volume interface {
	// GetPath returns the directory path the volume is mounted to.
	GetPath() string
}

Volume represents a directory used by pods or hosts on a node. All method implementations of methods in the volume interface must be idempotent.

type VolumeHost

type VolumeHost interface {
	// GetPluginDir returns the absolute path to a directory under which
	// a given plugin may store data.  This directory might not actually
	// exist on disk yet.  For plugin data that is per-pod, see
	// GetPodPluginDir().
	GetPluginDir(pluginName string) string

	// GetPodVolumeDir returns the absolute path a directory which
	// represents the named volume under the named plugin for the given
	// pod.  If the specified pod does not exist, the result of this call
	// might not exist.
	GetPodVolumeDir(podUID types.UID, pluginName string, volumeName string) string

	// GetPodPluginDir returns the absolute path to a directory under which
	// a given plugin may store data for a given pod.  If the specified pod
	// does not exist, the result of this call might not exist.  This
	// directory might not actually exist on disk yet.
	GetPodPluginDir(podUID types.UID, pluginName string) string

	// GetKubeClient returns a client interface
	GetKubeClient() client.Interface

	// NewWrapperBuilder finds an appropriate plugin with which to handle
	// the provided spec.  This is used to implement volume plugins which
	// "wrap" other plugins.  For example, the "secret" volume is
	// implemented in terms of the "emptyDir" volume.
	NewWrapperBuilder(spec *Spec, pod *api.Pod, opts VolumeOptions, mounter mount.Interface) (Builder, error)

	// NewWrapperCleaner finds an appropriate plugin with which to handle
	// the provided spec.  See comments on NewWrapperBuilder for more
	// context.
	NewWrapperCleaner(spec *Spec, podUID types.UID, mounter mount.Interface) (Cleaner, error)
}

VolumeHost is an interface that plugins can use to access the kubelet.

type VolumeOptions

type VolumeOptions struct {
	// The rootcontext to use when performing mounts for a volume.
	RootContext string
}

VolumeOptions contains option information about a volume.

Currently, this struct containers only a single field for the rootcontext of the volume. This is a temporary measure in order to set the rootContext of tmpfs mounts correctly; it will be replaced and expanded on by future SecurityContext work.

type VolumePlugin

type VolumePlugin interface {
	// Init initializes the plugin.  This will be called exactly once
	// before any New* calls are made - implementations of plugins may
	// depend on this.
	Init(host VolumeHost)

	// Name returns the plugin's name.  Plugins should use namespaced names
	// such as "example.com/volume".  The "kubernetes.io" namespace is
	// reserved for plugins which are bundled with kubernetes.
	Name() string

	// CanSupport tests whether the plugin supports a given volume
	// specification from the API.  The spec pointer should be considered
	// const.
	CanSupport(spec *Spec) bool

	// NewBuilder creates a new volume.Builder from an API specification.
	// Ownership of the spec pointer in *not* transferred.
	// - spec: The api.Volume spec
	// - pod: The enclosing pod
	NewBuilder(spec *Spec, podRef *api.Pod, opts VolumeOptions, mounter mount.Interface) (Builder, error)

	// NewCleaner creates a new volume.Cleaner from recoverable state.
	// - name: The volume name, as per the api.Volume spec.
	// - podUID: The UID of the enclosing pod
	NewCleaner(name string, podUID types.UID, mounter mount.Interface) (Cleaner, error)
}

VolumePlugin is an interface to volume plugins that can be used on a kubernetes node (e.g. by kubelet) to instantiate and manage volumes.

type VolumePluginMgr

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

VolumePluginMgr tracks registered plugins.

func (*VolumePluginMgr) FindPersistentPluginByName

func (pm *VolumePluginMgr) FindPersistentPluginByName(name string) (PersistentVolumePlugin, error)

FindPersistentPluginByName fetches a persistent volume plugin by name. If no plugin is found, returns error.

func (*VolumePluginMgr) FindPersistentPluginBySpec

func (pm *VolumePluginMgr) FindPersistentPluginBySpec(spec *Spec) (PersistentVolumePlugin, error)

FindPersistentPluginBySpec looks for a persistent volume plugin that can support a given volume specification. If no plugin is found, return an error

func (*VolumePluginMgr) FindPluginByName

func (pm *VolumePluginMgr) FindPluginByName(name string) (VolumePlugin, error)

FindPluginByName fetches a plugin by name or by legacy name. If no plugin is found, returns error.

func (*VolumePluginMgr) FindPluginBySpec

func (pm *VolumePluginMgr) FindPluginBySpec(spec *Spec) (VolumePlugin, error)

FindPluginBySpec looks for a plugin that can support a given volume specification. If no plugins can support or more than one plugin can support it, return error.

func (*VolumePluginMgr) FindRecyclablePluginBySpec

func (pm *VolumePluginMgr) FindRecyclablePluginBySpec(spec *Spec) (RecyclableVolumePlugin, error)

FindRecyclablePluginByName fetches a persistent volume plugin by name. If no plugin is found, returns error.

func (*VolumePluginMgr) InitPlugins

func (pm *VolumePluginMgr) InitPlugins(plugins []VolumePlugin, host VolumeHost) error

InitPlugins initializes each plugin. All plugins must have unique names. This must be called exactly once before any New* methods are called on any plugins.