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 CalculateTimeoutForVolume(minimumTimeout, timeoutIncrement int, pv *api.PersistentVolume) int64
- func NewFakeVolumeHost(rootDir string, kubeClient client.Interface, plugins []VolumePlugin) *fakeVolumeHost
- func NewPersistentVolumeRecyclerPodTemplate() *api.Pod
- func RecycleVolumeByWatchingPodUntilCompletion(pod *api.Pod, kubeClient client.Interface) error
- func RenameDirectory(oldPath, newName string) (string, error)
- type Builder
- type Cleaner
- type CreatableVolumePlugin
- type Creater
- type DeletableVolumePlugin
- type Deleter
- type FakeDeleter
- type FakeVolume
- 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) (Builder, error)
- func (plugin *FakeVolumePlugin) NewCleaner(volName string, podUID types.UID) (Cleaner, error)
- func (plugin *FakeVolumePlugin) NewDeleter(spec *Spec) (Deleter, error)
- func (plugin *FakeVolumePlugin) NewRecycler(spec *Spec) (Recycler, error)
- type PersistentVolumePlugin
- type RecyclableVolumePlugin
- type Recycler
- type Spec
- type Volume
- type VolumeConfig
- type VolumeHost
- type VolumeOptions
- type VolumePlugin
- type VolumePluginMgr
- func (pm *VolumePluginMgr) FindCreatablePluginBySpec(spec *Spec) (CreatableVolumePlugin, error)
- func (pm *VolumePluginMgr) FindDeletablePluginBySpec(spec *Spec) (DeletableVolumePlugin, error)
- 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
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func CalculateTimeoutForVolume ¶ added in v1.2.3
func CalculateTimeoutForVolume(minimumTimeout, timeoutIncrement int, pv *api.PersistentVolume) int64
CalculateTimeoutForVolume calculates time for a Recycler pod to complete a recycle operation. The calculation and return value is either the minimumTimeout or the timeoutIncrement per Gi of storage size, whichever is greater.
func NewFakeVolumeHost ¶ added in v0.15.0
func NewFakeVolumeHost(rootDir string, kubeClient client.Interface, plugins []VolumePlugin) *fakeVolumeHost
func NewPersistentVolumeRecyclerPodTemplate ¶ added in v1.2.3
NewPersistentVolumeRecyclerPodTemplate creates a template for a recycler pod. By default, a recycler pod simply runs "rm -rf" on a volume and tests for emptiness. Most attributes of the template will be correct for most plugin implementations. The following attributes can be overridden per plugin via configuration:
1. pod.Spec.Volumes[0].VolumeSource must be overridden. Recycler implementations without a valid VolumeSource will fail. 2. pod.GenerateName helps distinguish recycler pods by name. Recommended. Default is "pv-recycler-". 3. pod.Spec.ActiveDeadlineSeconds gives the recycler pod a maximum timeout before failing. Recommended. Default is 60 seconds.
See HostPath and NFS for working recycler examples
func RecycleVolumeByWatchingPodUntilCompletion ¶ added in v1.2.3
RecycleVolumeByWatchingPodUntilCompletion 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 recycler pod is always attempted before returning.
pod - the pod designed by a volume plugin to recycle the volume client - kube client for API operations.
func RenameDirectory ¶ added in v0.15.0
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 // IsReadOnly is a flag that gives the builder's ReadOnly attribute. // All persistent volumes have a private readOnly flag in their builders. IsReadOnly() bool }
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 CreatableVolumePlugin ¶
type CreatableVolumePlugin interface { VolumePlugin // NewCreater creates a new volume.Creater which knows how to create PersistentVolumes in accordance with // the plugin's underlying storage provider NewCreater(options VolumeOptions) (Creater, error) }
CreatableVolumePlugin is an extended interface of VolumePlugin and is used to create volumes for the cluster.
type Creater ¶
type Creater interface {
Create() (*api.PersistentVolume, error)
}
Create adds a new resource in the storage provider and creates a PersistentVolume for the new resource. Calls to Create should block until complete.
type DeletableVolumePlugin ¶ added in v1.2.3
type DeletableVolumePlugin interface { VolumePlugin // NewDeleter creates a new volume.Deleter which knows how to delete this resource // in accordance with the underlying storage provider after the volume's release from a claim NewDeleter(spec *Spec) (Deleter, error) }
DeletableVolumePlugin is an extended interface of VolumePlugin and is used by persistent volumes that want to be deleted from the cluster after their release from a PersistentVolumeClaim.
type Deleter ¶ added in v1.2.3
Delete removes the resource from the underlying storage provider. Calls to this method should block until the deletion is complete. Any error returned indicates the volume has failed to be reclaimed. A nil return indicates success.
type FakeDeleter ¶
type FakeDeleter struct {
// contains filtered or unexported fields
}
func (*FakeDeleter) Delete ¶
func (fd *FakeDeleter) Delete() error
func (*FakeDeleter) GetPath ¶
func (fd *FakeDeleter) GetPath() string
type FakeVolume ¶ added in v0.15.0
type FakeVolume struct { PodUID types.UID VolName string Plugin *FakeVolumePlugin }
func (*FakeVolume) GetPath ¶ added in v0.15.0
func (fv *FakeVolume) GetPath() string
func (*FakeVolume) IsReadOnly ¶
func (fv *FakeVolume) IsReadOnly() bool
func (*FakeVolume) SetUp ¶ added in v0.15.0
func (fv *FakeVolume) SetUp() error
func (*FakeVolume) SetUpAt ¶ added in v0.15.0
func (fv *FakeVolume) SetUpAt(dir string) error
func (*FakeVolume) TearDown ¶ added in v0.15.0
func (fv *FakeVolume) TearDown() error
func (*FakeVolume) TearDownAt ¶ added in v0.15.0
func (fv *FakeVolume) TearDownAt(dir string) error
type FakeVolumePlugin ¶ added in v0.15.0
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 v0.15.0
func (plugin *FakeVolumePlugin) CanSupport(spec *Spec) bool
func (*FakeVolumePlugin) GetAccessModes ¶ added in v0.15.0
func (plugin *FakeVolumePlugin) GetAccessModes() []api.PersistentVolumeAccessMode
func (*FakeVolumePlugin) Init ¶ added in v0.15.0
func (plugin *FakeVolumePlugin) Init(host VolumeHost)
func (*FakeVolumePlugin) Name ¶ added in v0.15.0
func (plugin *FakeVolumePlugin) Name() string
func (*FakeVolumePlugin) NewBuilder ¶ added in v0.15.0
func (plugin *FakeVolumePlugin) NewBuilder(spec *Spec, pod *api.Pod, opts VolumeOptions) (Builder, error)
func (*FakeVolumePlugin) NewCleaner ¶ added in v0.15.0
func (*FakeVolumePlugin) NewDeleter ¶
func (plugin *FakeVolumePlugin) NewDeleter(spec *Spec) (Deleter, error)
func (*FakeVolumePlugin) NewRecycler ¶ added in v0.20.1
func (plugin *FakeVolumePlugin) NewRecycler(spec *Spec) (Recycler, error)
type PersistentVolumePlugin ¶ added in v0.15.0
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 ¶ added in v0.20.1
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 ¶ added in v0.20.1
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.
func NewFakeRecycler ¶
func NewFakeRecycler(spec *Spec, host VolumeHost, config VolumeConfig) (Recycler, error)
type Spec ¶ added in v0.18.2
type Spec struct { Volume *api.Volume PersistentVolume *api.PersistentVolume ReadOnly bool }
Spec is an internal representation of a volume. All API volume types translate to Spec.
func NewSpecFromPersistentVolume ¶ added in v0.18.2
func NewSpecFromPersistentVolume(pv *api.PersistentVolume, readOnly bool) *Spec
NewSpecFromPersistentVolume creates an Spec from an api.PersistentVolume
func NewSpecFromVolume ¶ added in v0.18.2
NewSpecFromVolume creates an Spec from an api.Volume
type Volume ¶ added in v0.15.0
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 VolumeConfig ¶ added in v1.2.3
type VolumeConfig struct { // RecyclerPodTemplate is pod template that understands how to scrub clean a persistent volume after its release. // The template is used by plugins which override specific properties of the pod in accordance with that plugin. // See NewPersistentVolumeRecyclerPodTemplate for the properties that are expected to be overridden. RecyclerPodTemplate *api.Pod // RecyclerMinimumTimeout is the minimum amount of time in seconds for the recycler pod's ActiveDeadlineSeconds attribute. // Added to the minimum timeout is the increment per Gi of capacity. RecyclerMinimumTimeout int // RecyclerTimeoutIncrement is the number of seconds added to the recycler pod's ActiveDeadlineSeconds for each // Gi of capacity in the persistent volume. // Example: 5Gi volume x 30s increment = 150s + 30s minimum = 180s ActiveDeadlineSeconds for recycler pod RecyclerTimeoutIncrement int // OtherAttributes stores config as strings. These strings are opaque to the system and only understood by the binary // hosting the plugin and the plugin itself. OtherAttributes map[string]string }
VolumeConfig is how volume plugins receive configuration. An instance specific to the plugin will be passed to the plugin's ProbeVolumePlugins(config) func. Reasonable defaults will be provided by the binary hosting the plugins while allowing override of those default values. Those config values are then set to an instance of VolumeConfig and passed to the plugin.
Values in VolumeConfig are intended to be relevant to several plugins, but not necessarily all plugins. The preference is to leverage strong typing in this struct. All config items must have a descriptive but non-specific name (i.e, RecyclerMinimumTimeout is OK but RecyclerMinimumTimeoutForNFS is !OK). An instance of config will be given directly to the plugin, so config names specific to plugins are unneeded and wrongly expose plugins in this VolumeConfig struct.
OtherAttributes is a map of string values intended for one-off configuration of a plugin or config that is only relevant to a single plugin. All values are passed by string and require interpretation by the plugin. Passing config as strings is the least desirable option but can be used for truly one-off configuration. The binary should still use strong typing for this value when binding CLI values before they are passed as strings in OtherAttributes.
type VolumeHost ¶ added in v0.15.0
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, pod *api.Pod, 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) // Get cloud provider from kubelet. GetCloudProvider() cloudprovider.Interface // Get mounter interface. GetMounter() mount.Interface // Get writer interface for writing data to disk. GetWriter() io.Writer }
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. // 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. RootContext string // CapacityMB is the size in MB of a volume. CapacityMB int // AccessModes of a volume AccessModes []api.PersistentVolumeAccessMode // Reclamation policy for a persistent volume PersistentVolumeReclaimPolicy api.PersistentVolumeReclaimPolicy }
VolumeOptions contains option information about a volume.
type VolumePlugin ¶ added in v0.15.0
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 // - pod: The enclosing pod NewBuilder(spec *Spec, podRef *api.Pod, 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.
func ProbeVolumePlugins ¶
func ProbeVolumePlugins(config VolumeConfig) []VolumePlugin
type VolumePluginMgr ¶ added in v0.15.0
type VolumePluginMgr struct {
// contains filtered or unexported fields
}
VolumePluginMgr tracks registered plugins.
func (*VolumePluginMgr) FindCreatablePluginBySpec ¶ added in v1.2.3
func (pm *VolumePluginMgr) FindCreatablePluginBySpec(spec *Spec) (CreatableVolumePlugin, error)
FindCreatablePluginBySpec fetches a persistent volume plugin by name. If no plugin is found, returns error.
func (*VolumePluginMgr) FindDeletablePluginBySpec ¶ added in v1.2.3
func (pm *VolumePluginMgr) FindDeletablePluginBySpec(spec *Spec) (DeletableVolumePlugin, error)
FindDeletablePluginByName fetches a persistent volume plugin by name. If no plugin is found, returns error.
func (*VolumePluginMgr) FindPersistentPluginByName ¶ added in v0.15.0
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 ¶ added in v0.20.1
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 ¶ added in v0.15.0
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 v0.15.0
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) FindRecyclablePluginBySpec ¶ added in v0.20.1
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 ¶ added in v0.15.0
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.
Directories
¶
Path | Synopsis |
---|---|
Package aws_ebs contains the internal representation of AWS Elastic Block Store volumes.
|
Package aws_ebs contains the internal representation of AWS Elastic Block Store volumes. |
Package nfs contains the internal representation of Ceph file system (CephFS) volumes.
|
Package nfs contains the internal representation of Ceph file system (CephFS) volumes. |
Package cinder contains the internal representation of cinder volumes.
|
Package cinder contains the internal representation of cinder volumes. |
Package empty_dir contains the internal representation of emptyDir volumes.
|
Package empty_dir contains the internal representation of emptyDir volumes. |
Package fc contains the internal representation of Fibre Channel (fc) volumes.
|
Package fc contains the internal representation of Fibre Channel (fc) volumes. |
Package flocker contains the internal representation of Flocker volumes
|
Package flocker contains the internal representation of Flocker volumes |
Package gce_pd contains the internal representation of GCE PersistentDisk volumes.
|
Package gce_pd contains the internal representation of GCE PersistentDisk volumes. |
Package git_repo contains the internal representation of git repo volumes.
|
Package git_repo contains the internal representation of git repo volumes. |
Package glusterfs contains the internal representation of glusterfs volumes.
|
Package glusterfs contains the internal representation of glusterfs volumes. |
Package host_path contains the internal representation of hostPath volumes.
|
Package host_path contains the internal representation of hostPath volumes. |
Package iscsi contains the internal representation of Internet Small Computer System Interface (iSCSI) volumes.
|
Package iscsi contains the internal representation of Internet Small Computer System Interface (iSCSI) volumes. |
Package nfs contains the internal representation of network file system (NFS) volumes.
|
Package nfs contains the internal representation of network file system (NFS) volumes. |
Package persistent_claim contains the internal representation of persistent volume claims.
|
Package persistent_claim contains the internal representation of persistent volume claims. |
Package rbd contains the internal representation of Rados Block Store (Ceph) volumes.
|
Package rbd contains the internal representation of Rados Block Store (Ceph) volumes. |
Package secret contains the internal representation of secret volumes.
|
Package secret contains the internal representation of secret volumes. |
Contains utility code for use by volume plugins.
|
Contains utility code for use by volume plugins. |