volume

package
v0.16.0 Latest Latest
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 Go to latest Published: Apr 29, 2015 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Overview

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

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func GetAccessModesAsString added in v0.15.0 

func GetAccessModesAsString(modes []api.AccessModeType) string

func NewFakeVolumeHost added in v0.14.0 

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

func RenameDirectory added in v0.14.0 

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

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 method 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 method to cleanup/unmount the volumes.

type FakeVolume added in v0.14.0 

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

func (*FakeVolume) GetPath added in v0.14.0 

func (fv *FakeVolume) GetPath() string

func (*FakeVolume) SetUp added in v0.14.0 

func (fv *FakeVolume) SetUp() error

func (*FakeVolume) SetUpAt added in v0.14.0 

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

func (*FakeVolume) TearDown added in v0.14.0 

func (fv *FakeVolume) TearDown() error

func (*FakeVolume) TearDownAt added in v0.14.0 

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

type FakeVolumePlugin added in v0.14.0 

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 added in v0.14.0 

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

func (*FakeVolumePlugin) GetAccessModes added in v0.14.0 

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

func (*FakeVolumePlugin) Init added in v0.14.0 

func (plugin *FakeVolumePlugin) Init(host VolumeHost)

func (*FakeVolumePlugin) Name added in v0.14.0 

func (plugin *FakeVolumePlugin) Name() string

func (*FakeVolumePlugin) NewBuilder added in v0.14.0 

func (plugin *FakeVolumePlugin) NewBuilder(spec *Spec, podRef *api.ObjectReference, opts VolumeOptions) (Builder, error)

func (*FakeVolumePlugin) NewCleaner added in v0.14.0 

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

type PersistentVolumePlugin added in v0.14.0 

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

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

type Spec added in v0.16.0 

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 added in v0.16.0 

func NewSpecFromPersistentVolume(pv *api.PersistentVolume) *Spec

NewSpecFromPersistentVolume creates an Spec from an api.PersistentVolume

func NewSpecFromVolume added in v0.16.0 

func NewSpecFromVolume(vs *api.Volume) *Spec

NewSpecFromVolume creates an Spec from an api.Volume

type Volume added in v0.14.0 

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 added in v0.14.0 

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, podRef *api.ObjectReference, opts VolumeOptions) (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) (Cleaner, error)
}

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

type VolumeOptions added in v0.15.0 

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 added in v0.14.0 

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
	// - podRef: a reference to the enclosing pod
	NewBuilder(spec *Spec, podRef *api.ObjectReference, opts VolumeOptions) (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) (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 added in v0.14.0 

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

VolumePluginMgr tracks registered plugins.

func (*VolumePluginMgr) FindPersistentPluginByName added in v0.14.0 

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

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

func (*VolumePluginMgr) FindPluginByName added in v0.14.0 

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 added in v0.14.0 

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) InitPlugins added in v0.14.0 

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.

Source Files

View all Source files

Directories

Path Synopsis
Contains utility code for use by volume plugins.
 Contains utility code for use by volume plugins.

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