util

package
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 Go to latest Published: Sep 23, 2020 License: Apache-2.0 Imports: 41 Imported by: 0

Documentation

Overview

Contains utility code for use by volume plugins.

Index

Constants

View Source 
const (
	// EBSVolumeLimitKey resource name that will store volume limits for EBS
	EBSVolumeLimitKey = "attachable-volumes-aws-ebs"
	// EBSNitroLimitRegex finds nitro instance types with different limit than EBS defaults
	EBSNitroLimitRegex = "^[cmr]5.*|t3|z1d"
	// DefaultMaxEBSVolumes is the limit for volumes attached to an instance.
	// Amazon recommends no more than 40; the system root volume uses at least one.
	// See http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/volume_limits.html#linux-specific-volume-limits
	DefaultMaxEBSVolumes = 39
	// DefaultMaxEBSM5VolumeLimit is default EBS volume limit on m5 and c5 instances
	DefaultMaxEBSNitroVolumeLimit = 25
	// AzureVolumeLimitKey stores resource name that will store volume limits for Azure
	AzureVolumeLimitKey = "attachable-volumes-azure-disk"
	// GCEVolumeLimitKey stores resource name that will store volume limits for GCE node
	GCEVolumeLimitKey = "attachable-volumes-gce-pd"

	// CSIAttachLimitPrefix defines prefix used for CSI volumes
	CSIAttachLimitPrefix = "attachable-volumes-csi-"

	// ResourceNameLengthLimit stores maximum allowed Length for a ResourceName
	ResourceNameLengthLimit = 63
)
View Source 
const (
	// Name of finalizer on PVCs that have a running pod.
	PVCProtectionFinalizer = "kubernetes.io/pvc-protection"

	// Name of finalizer on PVs that are bound by PVCs
	PVProtectionFinalizer = "kubernetes.io/pv-protection"
)
View Source 
const (
	// GB - GigaByte size
	GB = 1000 * 1000 * 1000
	// GIB - GibiByte size
	GIB = 1024 * 1024 * 1024

	// ControllerManagedAttachAnnotation is the key of the annotation on Node
	// objects that indicates attach/detach operations for the node should be
	// managed by the attach/detach controller
	ControllerManagedAttachAnnotation string = "volumes.kubernetes.io/controller-managed-attach-detach"

	// KeepTerminatedPodVolumesAnnotation is the key of the annotation on Node
	// that decides if pod volumes are unmounted when pod is terminated
	KeepTerminatedPodVolumesAnnotation string = "volumes.kubernetes.io/keep-terminated-pod-volumes"

	// VolumeGidAnnotationKey is the of the annotation on the PersistentVolume
	// object that specifies a supplemental GID.
	VolumeGidAnnotationKey = "pv.beta.kubernetes.io/gid"

	// VolumeDynamicallyCreatedByKey is the key of the annotation on PersistentVolume
	// object created dynamically
	VolumeDynamicallyCreatedByKey = "kubernetes.io/createdby"
)

Variables

This section is empty.

Functions

func AccessModesContainedInAll 

func AccessModesContainedInAll(indexedModes []v1.PersistentVolumeAccessMode, requestedModes []v1.PersistentVolumeAccessMode) bool

AccessModesContainedInAll returns whether all of the requested modes are contained by modes

func AccessModesContains 

func AccessModesContains(modes []v1.PersistentVolumeAccessMode, mode v1.PersistentVolumeAccessMode) bool

AccessModesContains returns whether the requested mode is contained by modes

func CalculateTimeoutForVolume 

func CalculateTimeoutForVolume(minimumTimeout, timeoutIncrement int, pv *v1.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 CheckNodeAffinity 

func CheckNodeAffinity(pv *v1.PersistentVolume, nodeLabels map[string]string) error

CheckNodeAffinity looks at the PV node affinity, and checks if the node has the same corresponding labels This ensures that we don't mount a volume that doesn't belong to this node

func CheckPersistentVolumeClaimModeBlock 

func CheckPersistentVolumeClaimModeBlock(pvc *v1.PersistentVolumeClaim) bool

CheckPersistentVolumeClaimModeBlock checks VolumeMode. If the mode is Block, return true otherwise return false.

func CheckVolumeModeFilesystem 

func CheckVolumeModeFilesystem(volumeSpec *volume.Spec) (bool, error)

CheckVolumeModeFilesystem checks VolumeMode. If the mode is Filesystem, return true otherwise return false.

func ChooseZoneForVolume 

func ChooseZoneForVolume(zones sets.String, pvcName string) string

ChooseZoneForVolume implements our heuristics for choosing a zone for volume creation based on the volume name Volumes are generally round-robin-ed across all active zones, using the hash of the PVC Name. However, if the PVCName ends with `-<integer>`, we will hash the prefix, and then add the integer to the hash. This means that a StatefulSet's volumes (`claimname-statefulsetname-id`) will spread across available zones, assuming the id values are consecutive.

func ChooseZonesForVolume 

func ChooseZonesForVolume(zones sets.String, pvcName string, numZones uint32) sets.String

ChooseZonesForVolume is identical to ChooseZoneForVolume, but selects a multiple zones, for multi-zone disks.

func ClaimToClaimKey 

func ClaimToClaimKey(claim *v1.PersistentVolumeClaim) string

ClaimToClaimKey return namespace/name string for pvc

func GenerateVolumeName 

func GenerateVolumeName(clusterName, pvName string, maxLength int) string

GenerateVolumeName returns a PV name with clusterName prefix. The function should be used to generate a name of GCE PD or Cinder volume. It basically adds "<clusterName>-dynamic-" before the PV name, making sure the resulting string fits given length and cuts "dynamic" if not.

func GetCSIAttachLimitKey 

func GetCSIAttachLimitKey(driverName string) string

GetCSIAttachLimitKey returns limit key used for CSI volumes

func GetClassForVolume 

func GetClassForVolume(kubeClient clientset.Interface, pv *v1.PersistentVolume) (*storage.StorageClass, error)

func GetPath 

func GetPath(mounter volume.Mounter) (string, error)

GetPath checks if the path from the mounter is empty.

func GetPersistentVolumeClaimQualifiedName 

func GetPersistentVolumeClaimQualifiedName(claim *v1.PersistentVolumeClaim) string

GetPersistentVolumeClaimQualifiedName returns a qualified name for pvc.

func GetPersistentVolumeClaimVolumeMode 

func GetPersistentVolumeClaimVolumeMode(claim *v1.PersistentVolumeClaim) (v1.PersistentVolumeMode, error)

GetPersistentVolumeClaimVolumeMode retrieves VolumeMode from pvc.

func GetSecretForPV 

func GetSecretForPV(secretNamespace, secretName, volumePluginName string, kubeClient clientset.Interface) (map[string]string, error)

GetSecretForPV locates secret by name and namespace, verifies the secret type, and returns secret map

func GetSecretForPod 

func GetSecretForPod(pod *v1.Pod, secretName string, kubeClient clientset.Interface) (map[string]string, error)

GetSecretForPod locates secret by name in the pod's namespace and returns secret map

func GetUniquePodName 

func GetUniquePodName(pod *v1.Pod) types.UniquePodName

GetUniquePodName returns a unique identifier to reference a pod by

func GetUniqueVolumeName 

func GetUniqueVolumeName(pluginName, volumeName string) v1.UniqueVolumeName

GetUniqueVolumeName returns a unique name representing the volume/plugin. Caller should ensure that volumeName is a name/ID uniquely identifying the actual backing device, directory, path, etc. for a particular volume. The returned name can be used to uniquely reference the volume, for example, to prevent operations (attach/detach or mount/unmount) from being triggered on the same volume.

func GetUniqueVolumeNameForNonAttachableVolume 

func GetUniqueVolumeNameForNonAttachableVolume(
	podName types.UniquePodName, volumePlugin volume.VolumePlugin, volumeSpec *volume.Spec) v1.UniqueVolumeName

GetUniqueVolumeNameForNonAttachableVolume returns the unique volume name for a non-attachable volume.

func GetUniqueVolumeNameFromSpec 

func GetUniqueVolumeNameFromSpec(
	volumePlugin volume.VolumePlugin,
	volumeSpec *volume.Spec) (v1.UniqueVolumeName, error)

GetUniqueVolumeNameFromSpec uses the given VolumePlugin to generate a unique name representing the volume defined in the specified volume spec. This returned name can be used to uniquely reference the actual backing device, directory, path, etc. referenced by the given volumeSpec. If the given plugin does not support the volume spec, this returns an error.

func GetVolumeMode 

func GetVolumeMode(volumeSpec *volume.Spec) (v1.PersistentVolumeMode, error)

GetVolumeMode retrieves VolumeMode from pv. If the volume doesn't have PersistentVolume, it's an inline volume, should return volumeMode as filesystem to keep existing behavior.

func GetWindowsPath 

func GetWindowsPath(path string) string

GetWindowsPath get a windows path

func IsCorruptedMnt 

func IsCorruptedMnt(err error) bool

IsCorruptedMnt return true if err is about corrupted mount point

func IsPodTerminated 

func IsPodTerminated(pod *v1.Pod, podStatus v1.PodStatus) bool

IsPodTerminated checks if pod is terminated

func IsReady 

func IsReady(dir string) bool

IsReady checks for the existence of a regular file called 'ready' in the given directory and returns true if that file exists.

func JoinMountOptions 

func JoinMountOptions(userOptions []string, systemOptions []string) []string

JoinMountOptions joins mount options eliminating duplicates

func LabelZonesToList 

func LabelZonesToList(labelZonesValue string) ([]string, error)

LabelZonesToList converts a PV label value from string containing a delimited list of zones to list

func LabelZonesToSet 

func LabelZonesToSet(labelZonesValue string) (sets.String, error)

LabelZonesToSet converts a PV label value from string containing a delimited list of zones to set

func LoadPodFromFile 

func LoadPodFromFile(filePath string) (*v1.Pod, error)

LoadPodFromFile will read, decode, and return a Pod from a file.

func MakeAbsolutePath 

func MakeAbsolutePath(goos, path string) string

MakeAbsolutePath convert path to absolute path according to GOOS

func MakeNestedMountpoints 

func MakeNestedMountpoints(name, baseDir string, pod v1.Pod) error

MakeNestedMountpoints creates mount points in baseDir for volumes mounted beneath name

func MapBlockVolume 

func MapBlockVolume(
	devicePath,
	globalMapPath,
	podVolumeMapPath,
	volumeMapName string,
	podUID utypes.UID,
) error

MapBlockVolume is a utility function to provide a common way of mounting block device path for a specified volume and pod. This function should be called by volume plugins that implements volume.BlockVolumeMapper.Map() method.

func MarkFSResizeFinished 

func MarkFSResizeFinished(
	pvc *v1.PersistentVolumeClaim,
	capacity v1.ResourceList,
	kubeClient clientset.Interface) error

MarkFSResizeFinished marks file system resizing as done

func MergeResizeConditionOnPVC 

func MergeResizeConditionOnPVC(
	pvc *v1.PersistentVolumeClaim,
	resizeConditions []v1.PersistentVolumeClaimCondition) *v1.PersistentVolumeClaim

MergeResizeConditionOnPVC updates pvc with requested resize conditions leaving other conditions untouched.

func MountOptionFromSpec 

func MountOptionFromSpec(spec *volume.Spec, options ...string) []string

MountOptionFromSpec extracts and joins mount options from volume spec with supplied options

func NewDanglingError 

func NewDanglingError(msg string, node k8stypes.NodeName, devicePath string) error

func NewSafeFormatAndMountFromHost 

func NewSafeFormatAndMountFromHost(pluginName string, host volume.VolumeHost) *mount.SafeFormatAndMount

NewSafeFormatAndMountFromHost creates a new SafeFormatAndMount with Mounter and Exec taken from given VolumeHost.

func OperationCompleteHook 

func OperationCompleteHook(plugin, operationName string) func(*error)

OperationCompleteHook returns a hook to call when an operation is completed

func PatchPVCStatus 

func PatchPVCStatus(
	oldPVC *v1.PersistentVolumeClaim,
	newPVC *v1.PersistentVolumeClaim,
	kubeClient clientset.Interface) (*v1.PersistentVolumeClaim, error)

PatchPVCStatus updates PVC status using PATCH verb

func PathExists 

func PathExists(path string) (bool, error)

PathExists returns true if the specified path exists.

func RoundUpSize 

func RoundUpSize(volumeSizeBytes int64, allocationUnitBytes int64) int64

RoundUpSize calculates how many allocation units are needed to accommodate a volume of given size. E.g. when user wants 1500MiB volume, while AWS EBS allocates volumes in gibibyte-sized chunks, RoundUpSize(1500 * 1024*1024, 1024*1024*1024) returns '2' (2 GiB is the smallest allocatable volume that can hold 1500MiB)

func RoundUpSizeInt 

func RoundUpSizeInt(volumeSizeBytes int64, allocationUnitBytes int64) (int, error)

RoundUpSizeInt calculates how many allocation units are needed to accommodate a volume of given size. It returns an int instead of an int64 and an error if there's overflow

func RoundUpToGB 

func RoundUpToGB(size resource.Quantity) int64

RoundUpToGB rounds up given quantity to chunks of GB

func RoundUpToGBInt 

func RoundUpToGBInt(size resource.Quantity) (int, error)

RoundUpToGBInt rounds up given quantity to chunks of GB. It returns an int instead of an int64 and an error if there's overflow

func RoundUpToGiB 

func RoundUpToGiB(size resource.Quantity) int64

RoundUpToGiB rounds up given quantity upto chunks of GiB

func RoundUpToGiBInt 

func RoundUpToGiBInt(size resource.Quantity) (int, error)

RoundUpToGiBInt rounds up given quantity upto chunks of GiB. It returns an int instead of an int64 and an error if there's overflow

func SelectZoneForVolume 

func SelectZoneForVolume(zoneParameterPresent, zonesParameterPresent bool, zoneParameter string, zonesParameter, zonesWithNodes sets.String, node *v1.Node, allowedTopologies []v1.TopologySelectorTerm, pvcName string) (string, error)

SelectZoneForVolume is a wrapper around SelectZonesForVolume to select a single zone for a volume based on parameters

func SelectZonesForVolume 

func SelectZonesForVolume(zoneParameterPresent, zonesParameterPresent bool, zoneParameter string, zonesParameter, zonesWithNodes sets.String, node *v1.Node, allowedTopologies []v1.TopologySelectorTerm, pvcName string, numReplicas uint32) (sets.String, error)

SelectZonesForVolume selects zones for a volume based on several factors: node.zone, allowedTopologies, zone/zones parameters from storageclass, zones with active nodes from the cluster. The number of zones = replicas.

func SetReady 

func SetReady(dir string)

SetReady creates a file called 'ready' in the given directory. It logs an error if the file cannot be created.

func SplitUniqueName 

func SplitUniqueName(uniqueName v1.UniqueVolumeName) (string, string, error)

SplitUniqueName splits the unique name to plugin name and volume name strings. It expects the uniqueName to follow the format plugin_name/volume_name and the plugin name must be namespaced as described by the plugin interface, i.e. namespace/plugin containing exactly one '/'. This means the unique name will always be in the form of plugin_namespace/plugin/volume_name, see k8s.io/kubernetes/pkg/volume/plugins.go VolumePlugin interface description and pkg/volume/util/volumehelper/volumehelper.go GetUniqueVolumeNameFromSpec that constructs the unique volume names.

func UnmountMountPoint 

func UnmountMountPoint(mountPath string, mounter mount.Interface, extensiveMountPointCheck bool) error

UnmountMountPoint is a common unmount routine that unmounts the given path and deletes the remaining directory if successful. if extensiveMountPointCheck is true IsNotMountPoint will be called instead of IsLikelyNotMountPoint. IsNotMountPoint is more expensive but properly handles bind mounts.

func UnmountPath 

func UnmountPath(mountPath string, mounter mount.Interface) error

UnmountPath is a common unmount routine that unmounts the given path and deletes the remaining directory if successful.

func UnmountViaEmptyDir 

func UnmountViaEmptyDir(dir string, host volume.VolumeHost, volName string, volSpec volume.Spec, podUID utypes.UID) error

UnmountViaEmptyDir delegates the tear down operation for secret, configmap, git_repo and downwardapi to empty_dir

func ValidateZone 

func ValidateZone(zone string) error

ValidateZone returns: - an error in case zone is an empty string or contains only any combination of spaces and tab characters - nil otherwise

func ZonesFromAllowedTopologies 

func ZonesFromAllowedTopologies(allowedTopologies []v1.TopologySelectorTerm) (sets.String, error)

ZonesFromAllowedTopologies returns a list of zones specified in allowedTopologies

func ZonesSetToLabelValue 

func ZonesSetToLabelValue(strSet sets.String) string

func ZonesToSet 

func ZonesToSet(zonesString string) (sets.String, error)

ZonesToSet converts a string containing a comma separated list of zones to set

Types

type AtomicWriter 

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

AtomicWriter handles atomically projecting content for a set of files into a target directory.

Note:

  1. AtomicWriter reserves the set of pathnames starting with `..`.
  2. AtomicWriter offers no concurrency guarantees and must be synchronized by the caller.

The visible files in this volume are symlinks to files in the writer's data directory. Actual files are stored in a hidden timestamped directory which is symlinked to by the data directory. The timestamped directory and data directory symlink are created in the writer's target dir.  This scheme allows the files to be atomically updated by changing the target of the data directory symlink.

Consumers of the target directory can monitor the ..data symlink using inotify or fanotify to receive events when the content in the volume is updated.

func NewAtomicWriter 

func NewAtomicWriter(targetDir string, logContext string) (*AtomicWriter, error)

NewAtomicWriter creates a new AtomicWriter configured to write to the given target directory, or returns an error if the target directory does not exist.

func (*AtomicWriter) Write 

func (w *AtomicWriter) Write(payload map[string]FileProjection) error

Write does an atomic projection of the given payload into the writer's target directory. Input paths must not begin with '..'.

The Write algorithm is:

  1. The payload is validated; if the payload is invalid, the function returns 2.  The current timestamped directory is detected by reading the data directory symlink

  2. The old version of the volume is walked to determine whether any portion of the payload was deleted and is still present on disk.

  3. The data in the current timestamped directory is compared to the projected data to determine if an update is required. 5.  A new timestamped dir is created

  4. The payload is written to the new timestamped directory 7.  Symlinks and directory for new user-visible files are created (if needed).

    For example, consider the files: <target-dir>/podName <target-dir>/user/labels <target-dir>/k8s/annotations

    The user visible files are symbolic links into the internal data directory: <target-dir>/podName -> ..data/podName <target-dir>/usr -> ..data/usr <target-dir>/k8s -> ..data/k8s

    The data directory itself is a link to a timestamped directory with the real data: <target-dir>/..data -> ..2016_02_01_15_04_05.12345678/ 8.  A symlink to the new timestamped directory ..data_tmp is created that will become the new data directory 9.  The new data directory symlink is renamed to the data directory; rename is atomic

10. Old paths are removed from the user-visible portion of the target directory 11.  The previous timestamped directory is removed, if it exists

type DanglingAttachError 

type DanglingAttachError struct {
	CurrentNode k8stypes.NodeName
	DevicePath  string
	// contains filtered or unexported fields
}

This error on attach indicates volume is attached to a different node than we expected.

func (*DanglingAttachError) Error 

func (err *DanglingAttachError) Error() string

type DeviceUtil 

type DeviceUtil interface {
	FindMultipathDeviceForDevice(disk string) string
	FindSlaveDevicesOnMultipath(disk string) []string
	GetISCSIPortalHostMapForTarget(targetIqn string) (map[string]int, error)
	FindDevicesForISCSILun(targetIqn string, lun int) ([]string, error)
}

DeviceUtil is a util for common device methods

func NewDeviceHandler 

func NewDeviceHandler(io IoUtil) DeviceUtil

NewDeviceHandler Create a new IoHandler implementation

type FileProjection 

type FileProjection struct {
	Data []byte
	Mode int32
}

type IoUtil 

type IoUtil interface {
	ReadFile(filename string) ([]byte, error)
	ReadDir(dirname string) ([]os.FileInfo, error)
	Lstat(name string) (os.FileInfo, error)
	EvalSymlinks(path string) (string, error)
}

IoUtil is a mockable util for common IO operations

func NewIOHandler 

func NewIOHandler() IoUtil

NewIOHandler Create a new IoHandler implementation

type VolumeZoneConfig 

type VolumeZoneConfig struct {
	ZonePresent                bool
	ZonesPresent               bool
	ReplicaZoneFromNodePresent bool
	Zone                       string
	Zones                      string
	ReplicaZoneFromNode        string
}

VolumeZoneConfig contains config information about zonal volume.

Source Files

View all Source files

Directories

Path Synopsis
Package nestedpendingoperations is a modified implementation of pkg/util/goroutinemap.
 Package nestedpendingoperations is a modified implementation of pkg/util/goroutinemap.
Package operationexecutor implements interfaces that enable execution of attach, detach, mount, and unmount operations with a nestedpendingoperations so that more than one operation is never triggered on the same volume for the same pod.
 Package operationexecutor implements interfaces that enable execution of attach, detach, mount, and unmount operations with a nestedpendingoperations so that more than one operation is never triggered on the same volume for the same pod.
Package types defines types used only by volume components
 Package types defines types used only by volume components

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