drain

Documentation

Overview

Package drain is used to drain nodes

Package drain is used to drain nodes

Package drain is used to drain nodes

Package drain is used to drain nodes

Index

• Constants
• Variables
• func SupportEviction(clientset kubernetes.Interface) (string, error)
• type Options
  • func NewDrainOptions(client kubernetes.Interface, timeout time.Duration, maxEvictRetries int32, ...) *Options
  • func (o *Options) RunCordonOrUncordon(ctx context.Context, desired bool) error
  • func (o *Options) RunDrain(ctx context.Context) error
• type PodVolumeInfo
• type VolumeAttachmentHandler
  • func NewVolumeAttachmentHandler() *VolumeAttachmentHandler
  • func (v *VolumeAttachmentHandler) AddVolumeAttachment(obj interface{})
  • func (v *VolumeAttachmentHandler) AddWorker() chan *storagev1.VolumeAttachment
  • func (v *VolumeAttachmentHandler) DeleteWorker(desiredWorker chan *storagev1.VolumeAttachment)
  • func (v *VolumeAttachmentHandler) UpdateVolumeAttachment(oldObj, newObj interface{})

Constants

const (
	// EvictionKind is the kind used for eviction
	EvictionKind = "Eviction"
	// EvictionSubresource is the kind used for evicting pods
	EvictionSubresource = "pods/eviction"

	// DefaultMachineDrainTimeout is the default value for MachineDrainTimeout
	DefaultMachineDrainTimeout = 2 * time.Hour

	// PodsWithoutPVDrainGracePeriod defines the grace period to wait for the pods without PV during machine drain.
	// This is in addition to the maximum terminationGracePeriod amount the pods.
	PodsWithoutPVDrainGracePeriod = 3 * time.Minute

	// Interval is the default Poll interval
	Interval = time.Second * 5

	// PodEvictionRetryInterval is the interval in which to retry eviction for pods
	PodEvictionRetryInterval = time.Second * 20

	// GetPvDetailsRetryInterval is the interval in which to retry getting PV details
	GetPvDetailsRetryInterval = time.Second * 5
	// GetPvDetailsMaxRetries is the number of max retries to get PV details
	GetPvDetailsMaxRetries = 3
	// VolumeDetachPollInterval is the interval in which to recheck if the volume is detached from the node
	VolumeDetachPollInterval = time.Second * 5
)

Variables

var (
	// DefaultMaxEvictRetries is the default value for MaxEvictRetries
	DefaultMaxEvictRetries = int32(DefaultMachineDrainTimeout.Seconds() / PodEvictionRetryInterval.Seconds())
)

Functions

func SupportEviction

func SupportEviction(clientset kubernetes.Interface) (string, error)

SupportEviction uses Discovery API to find out if the server support eviction subresource If support, it will return its groupVersion; Otherwise, it will return ""

Types

type Options

type Options struct {
	DeleteLocalData bool
	Driver          driver.Driver

	ErrOut                       io.Writer
	ForceDeletePods              bool
	GracePeriodSeconds           int
	IgnorePodsWithoutControllers bool
	IgnoreDaemonsets             bool
	MaxEvictRetries              int32
	PvDetachTimeout              time.Duration
	PvReattachTimeout            time.Duration

	Out io.Writer

	Timeout time.Duration
	// contains filtered or unexported fields
}

Options are configurable options while draining a node before deletion

func NewDrainOptions

func NewDrainOptions(
	client kubernetes.Interface,
	timeout time.Duration,
	maxEvictRetries int32,
	pvDetachTimeout time.Duration,
	pvReattachTimeout time.Duration,
	nodeName string,
	gracePeriodSeconds int,
	forceDeletePods bool,
	ignorePodsWithoutControllers bool,
	ignoreDaemonsets bool,
	deleteLocalData bool,
	out io.Writer,
	errOut io.Writer,
	driver driver.Driver,
	pvcLister corelisters.PersistentVolumeClaimLister,
	pvLister corelisters.PersistentVolumeLister,
	pdbLister policylisters.PodDisruptionBudgetLister,
	nodeLister corelisters.NodeLister,
	volumeAttachmentHandler *VolumeAttachmentHandler,
) *Options

NewDrainOptions creates a new DrainOptions struct and returns a pointer to it

func (*Options) RunCordonOrUncordon

func (o *Options) RunCordonOrUncordon(ctx context.Context, desired bool) error

RunCordonOrUncordon runs either Cordon or Uncordon. The desired value for "Unschedulable" is passed as the first arg.

func (*Options) RunDrain

func (o *Options) RunDrain(ctx context.Context) error

RunDrain runs the 'drain' command

type PodVolumeInfo

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

PodVolumeInfo is the struct used to hold the PersistentVolumeID and volumeID for all the PVs attached to the pod

type VolumeAttachmentHandler

type VolumeAttachmentHandler struct {
	sync.Mutex
	// contains filtered or unexported fields
}

VolumeAttachmentHandler is an handler used to distribute incoming VolumeAttachment requests to all listening workers

func NewVolumeAttachmentHandler

func NewVolumeAttachmentHandler() *VolumeAttachmentHandler

NewVolumeAttachmentHandler returns a new VolumeAttachmentHandler

func (*VolumeAttachmentHandler) AddVolumeAttachment

func (v *VolumeAttachmentHandler) AddVolumeAttachment(obj interface{})

AddVolumeAttachment is the event handler for VolumeAttachment add

func (*VolumeAttachmentHandler) AddWorker

func (v *VolumeAttachmentHandler) AddWorker() chan *storagev1.VolumeAttachment

AddWorker is the method used to add a new worker

func (*VolumeAttachmentHandler) DeleteWorker

func (v *VolumeAttachmentHandler) DeleteWorker(desiredWorker chan *storagev1.VolumeAttachment)

DeleteWorker is the method used to delete an existing worker

func (*VolumeAttachmentHandler) UpdateVolumeAttachment

func (v *VolumeAttachmentHandler) UpdateVolumeAttachment(oldObj, newObj interface{})

UpdateVolumeAttachment is the event handler for VolumeAttachment update