flexvolume

Documentation

Overview

Package flexvolume to manage Kubernetes storage attach events.

Package flexvolume to manage Kubernetes storage attach events.

Index

• Constants
• func LoadFlexSettings(directory string) []byte
• func RookDriverName(context *clusterd.Context) (string, error)
• func TouchFlexDrivers(vendor, driverName string)
• type AttachOptions
• type ClientAccessInfo
• type Controller
  • func NewController(context *clusterd.Context, volumeAttachment attachment.Attachment, ...) *Controller
  • func (c *Controller) Attach(attachOpts AttachOptions, devicePath *string) error
  • func (c *Controller) Detach(detachOpts AttachOptions, _ *struct{}) error
  • func (c *Controller) DetachForce(detachOpts AttachOptions, _ *struct{}) error
  • func (c *Controller) GetAttachInfoFromMountDir(mountDir string, attachOptions *AttachOptions) error
  • func (c *Controller) GetClientAccessInfo(args []string, clientAccessInfo *ClientAccessInfo) error
  • func (c *Controller) GetGlobalMountPath(input GlobalMountPathInput, globalMountPath *string) error
  • func (c *Controller) GetKernelVersion(_ *struct{}, kernelVersion *string) error
  • func (c *Controller) Log(message LogMessage, _ *struct{}) error
  • func (c *Controller) RemoveAttachmentObject(detachOpts AttachOptions, safeToDetach *bool) error
• type FlexvolumeServer
  • func NewFlexvolumeServer(context *clusterd.Context, controller *Controller) *FlexvolumeServer
  • func (s *FlexvolumeServer) Start(driverVendor, driverName string) error
  • func (s *FlexvolumeServer) StopAll()
• type GlobalMountPathInput
• type LogMessage
• type MockFlexvolumeController
  • func (m *MockFlexvolumeController) Attach(attachOpts AttachOptions, devicePath *string) error
  • func (m *MockFlexvolumeController) Detach(detachOpts AttachOptions, _ *struct{}) error
  • func (m *MockFlexvolumeController) DetachForce(detachOpts AttachOptions, _ *struct{}) error
  • func (m *MockFlexvolumeController) GetAttachInfoFromMountDir(mountDir string, attachOptions *AttachOptions) error
  • func (m *MockFlexvolumeController) Log(message LogMessage, _ *struct{}) error
  • func (m *MockFlexvolumeController) RemoveAttachmentObject(detachOpts AttachOptions, safeToDetach *bool) error
• type VolumeController
• type VolumeManager

Constants

const (
	// ClusterNamespaceKey key for cluster namespace option.
	ClusterNamespaceKey = "clusterNamespace"
	// ClusterNameKey key for cluster name option (deprecated).
	ClusterNameKey = "clusterName"
	// StorageClassKey key for storage class name option.
	StorageClassKey = "storageClass"
	// PoolKey key for pool name option.
	PoolKey = "pool"
	// BlockPoolKey key for blockPool name option.
	BlockPoolKey = "blockPool"
	// PoolKey key for image name option.
	ImageKey = "image"
	// PoolKey key for data pool name option.
	DataBlockPoolKey = "dataBlockPool"
)

const (
	UnixSocketName         = ".rook.sock"
	FlexvolumeVendor       = "ceph.rook.io"
	FlexvolumeVendorLegacy = "rook.io"
	FlexDriverName         = "rook"
)

const (
	// ReadOnly mount mode
	ReadOnly = "ro"
	// ReadWrite mount mode
	ReadWrite = "rw"
)

Functions

func LoadFlexSettings

func LoadFlexSettings(directory string) []byte

The flex settings must be loaded from a file next to the flex driver since there is context that can be used other than the directory where the flex driver is running. This method cannot write to stdout since it is running in the context of the kubelet which only expects the json settings to be output.

func RookDriverName

func RookDriverName(context *clusterd.Context) (string, error)

RookDriverName return the Kubernetes version appropriate Rook driver name

func TouchFlexDrivers

func TouchFlexDrivers(vendor, driverName string)

TouchFlexDrivers causes k8s to reload the flex volumes. Needed periodically due to a k8s race condition with flex driver loading.

Types

type AttachOptions

type AttachOptions struct {
	Image            string `json:"image"`
	BlockPool        string `json:"blockPool"`
	Pool             string `json:"pool"`
	ClusterNamespace string `json:"clusterNamespace"`
	ClusterName      string `json:"clusterName"`
	StorageClass     string `json:"storageClass"`
	MountDir         string `json:"mountDir"`
	FsName           string `json:"fsName"`
	Path             string `json:"path"` // Path within the CephFS to mount
	MountUser        string `json:"mountUser"`
	MountSecret      string `json:"mountSecret"`
	RW               string `json:"kubernetes.io/readwrite"`
	FsType           string `json:"kubernetes.io/fsType"`
	VolumeName       string `json:"kubernetes.io/pvOrVolumeName"` // only available on 1.7
	Pod              string `json:"kubernetes.io/pod.name"`
	PodID            string `json:"kubernetes.io/pod.uid"`
	PodNamespace     string `json:"kubernetes.io/pod.namespace"`
}

type ClientAccessInfo

type ClientAccessInfo struct {
	MonAddresses []string `json:"monAddresses"`
	UserName     string   `json:"userName"`
	SecretKey    string   `json:"secretKey"`
}

ClientAccessInfo hols info for Ceph access

type Controller

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

Controller handles all events from the Flexvolume driver

func NewController

func NewController(context *clusterd.Context, volumeAttachment attachment.Attachment, manager VolumeManager, mountSecurityMode string) *Controller

NewController create a new controller to handle events from the flexvolume driver

func (*Controller) Attach

func (c *Controller) Attach(attachOpts AttachOptions, devicePath *string) error

Attach attaches rook volume to the node

func (*Controller) Detach

func (c *Controller) Detach(detachOpts AttachOptions, _ *struct{}) error

Detach detaches a rook volume to the node

func (*Controller) DetachForce

func (c *Controller) DetachForce(detachOpts AttachOptions, _ *struct{}) error

DetachForce forces a detach on a rook volume to the node

func (*Controller) GetAttachInfoFromMountDir

func (c *Controller) GetAttachInfoFromMountDir(mountDir string, attachOptions *AttachOptions) error

GetAttachInfoFromMountDir obtain pod and volume information from the mountDir. K8s does not provide all necessary information to detach a volume (https://github.com/kubernetes/kubernetes/issues/52590). So we are hacking a bit and by parsing it from mountDir

func (*Controller) GetClientAccessInfo

func (c *Controller) GetClientAccessInfo(args []string, clientAccessInfo *ClientAccessInfo) error

GetClientAccessInfo obtains the cluster monitor endpoints, username and secret

func (*Controller) GetGlobalMountPath

func (c *Controller) GetGlobalMountPath(input GlobalMountPathInput, globalMountPath *string) error

GetGlobalMountPath generate the global mount path where the device path is mounted. It is based on the kubelet root dir, which defaults to /var/lib/kubelet

func (*Controller) GetKernelVersion

func (c *Controller) GetKernelVersion(_ *struct{}, kernelVersion *string) error

GetKernelVersion returns the kernel version of the current node.

func (*Controller) Log

func (c *Controller) Log(message LogMessage, _ *struct{}) error

Log logs messages from the driver

func (*Controller) RemoveAttachmentObject

func (c *Controller) RemoveAttachmentObject(detachOpts AttachOptions, safeToDetach *bool) error

RemoveAttachmentObject removes the attachment from the Volume CRD and returns whether the volume is safe to detach

type FlexvolumeServer

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

FlexvolumeServer start a unix domain socket server to interact with the flexvolume driver

func NewFlexvolumeServer

func NewFlexvolumeServer(context *clusterd.Context, controller *Controller) *FlexvolumeServer

NewFlexvolumeServer creates an Flexvolume server

func (*FlexvolumeServer) Start

func (s *FlexvolumeServer) Start(driverVendor, driverName string) error

Start configures the flexvolume driver on the host and starts the unix domain socket server to communicate with the driver

func (*FlexvolumeServer) StopAll

func (s *FlexvolumeServer) StopAll()

StopAll Stop the unix domain socket server and deletes the socket file

type GlobalMountPathInput

type GlobalMountPathInput struct {
	VolumeName string `json:"volumeName"`
	DriverDir  string `json:"driverDir"`
}

type LogMessage

type LogMessage struct {
	Message string `json:"message"`
	IsError bool   `json:"isError"`
}

type MockFlexvolumeController

type MockFlexvolumeController struct {
	MockAttach                    func(attachOpts AttachOptions, devicePath *string) error
	MockDetach                    func(detachOpts AttachOptions, _ *struct{}) error
	MockDetachForce               func(detachOpts AttachOptions, _ *struct{}) error
	MockRemoveAttachmentObject    func(detachOpts AttachOptions, safeToDetach *bool) error
	MockLog                       func(message LogMessage, _ *struct{}) error
	MockGetAttachInfoFromMountDir func(mountDir string, attachOptions *AttachOptions) error
}

func (*MockFlexvolumeController) Attach

func (m *MockFlexvolumeController) Attach(attachOpts AttachOptions, devicePath *string) error

func (*MockFlexvolumeController) Detach

func (m *MockFlexvolumeController) Detach(detachOpts AttachOptions, _ *struct{}) error

func (*MockFlexvolumeController) DetachForce

func (m *MockFlexvolumeController) DetachForce(detachOpts AttachOptions, _ *struct{}) error

func (*MockFlexvolumeController) GetAttachInfoFromMountDir

func (m *MockFlexvolumeController) GetAttachInfoFromMountDir(mountDir string, attachOptions *AttachOptions) error

func (*MockFlexvolumeController) Log

func (m *MockFlexvolumeController) Log(message LogMessage, _ *struct{}) error

func (*MockFlexvolumeController) RemoveAttachmentObject

func (m *MockFlexvolumeController) RemoveAttachmentObject(detachOpts AttachOptions, safeToDetach *bool) error

type VolumeController

type VolumeController interface {
	Attach(attachOpts AttachOptions, devicePath *string) error
	Detach(detachOpts AttachOptions, _ *struct{}) error
	DetachForce(detachOpts AttachOptions, _ *struct{}) error
	RemoveAttachmentObject(detachOpts AttachOptions, safeToDetach *bool) error
	Log(message LogMessage, _ *struct{}) error
	GetAttachInfoFromMountDir(mountDir string, attachOptions *AttachOptions) error
}

type VolumeManager

type VolumeManager interface {
	Init() error
	Attach(image, pool, id, key, clusterName string) (string, error)
	Detach(image, pool, id, key, clusterName string, force bool) error
}

VolumeManager handles flexvolume plugin storage operations