drain

README

The code in this directory has been copied from: github.com/kubernetes/kubectl/pkg/drain@1d4a9f61b60afb57e26bee90a106bedccfcecfb7

With dry run exlcude

Documentation

Index

• Constants
• func CheckEvictionSupport(clientset kubernetes.Interface) (string, error)
• func RunCordonOrUncordon(drainer *Helper, node *corev1.Node, desired bool) error
• func RunNodeDrain(drainer *Helper, nodeName string) error
• type CordonHelper
  • func NewCordonHelper(node *corev1.Node) *CordonHelper
  • func NewCordonHelperFromRuntimeObject(nodeObject runtime.Object, scheme *runtime.Scheme, gvk schema.GroupVersionKind) (*CordonHelper, error)
  • func (c *CordonHelper) PatchOrReplace(clientset kubernetes.Interface, serverDryRun bool) (error, error)
  • func (c *CordonHelper) PatchOrReplaceWithContext(clientCtx context.Context, clientset kubernetes.Interface, serverDryRun bool) (error, error)
  • func (c *CordonHelper) UpdateIfRequired(desired bool) bool
• type Helper
  • func NewDrainer(kubeClient kubernetes.Interface, errOut io.Writer) *Helper
  • func (d *Helper) DeleteOrEvictPods(pods []corev1.Pod) error
  • func (d *Helper) DeletePod(pod corev1.Pod) error
  • func (d *Helper) EvictPod(pod corev1.Pod, policyGroupVersion string) error
  • func (d *Helper) GetPodsForDeletion(nodeName string) (*PodDeleteList, []error)
• type PodDelete
• type PodDeleteList
  • func (l *PodDeleteList) Pods() []corev1.Pod
  • func (l *PodDeleteList) Warnings() string
• type PodDeleteStatus
  • func MakePodDeleteStatusOkay() PodDeleteStatus
  • func MakePodDeleteStatusSkip() PodDeleteStatus
  • func MakePodDeleteStatusWithError(message string) PodDeleteStatus
  • func MakePodDeleteStatusWithWarning(delete bool, message string) PodDeleteStatus
• type PodFilter

Constants

const (
	// EvictionKind represents the kind of evictions object
	EvictionKind = "Eviction"
	// EvictionSubresource represents the kind of evictions object as pod's subresource
	EvictionSubresource = "pods/eviction"

	PodEvictionRetryInterval = 20 * time.Second
)

const (
	// PodDeleteStatusTypeOkay is "Okay"
	PodDeleteStatusTypeOkay = "Okay"
	// PodDeleteStatusTypeSkip is "Skip"
	PodDeleteStatusTypeSkip = "Skip"
	// PodDeleteStatusTypeWarning is "Warning"
	PodDeleteStatusTypeWarning = "Warning"
	// PodDeleteStatusTypeError is "Error"
	PodDeleteStatusTypeError = "Error"
)

Functions

func CheckEvictionSupport

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

CheckEvictionSupport uses Discovery API to find out if the server support eviction subresource If support, it will return its groupVersion; Otherwise, it will return an empty string

func RunCordonOrUncordon

func RunCordonOrUncordon(drainer *Helper, node *corev1.Node, desired bool) error

RunCordonOrUncordon demonstrates the canonical way to cordon or uncordon a Node

func RunNodeDrain

func RunNodeDrain(drainer *Helper, nodeName string) error

RunNodeDrain shows the canonical way to drain a node. You should first cordon the node, e.g. using RunCordonOrUncordon

Types

type CordonHelper

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

CordonHelper wraps functionality to cordon/uncordon nodes

func NewCordonHelper

func NewCordonHelper(node *corev1.Node) *CordonHelper

NewCordonHelper returns a new CordonHelper

func NewCordonHelperFromRuntimeObject

func NewCordonHelperFromRuntimeObject(nodeObject runtime.Object, scheme *runtime.Scheme, gvk schema.GroupVersionKind) (*CordonHelper, error)

NewCordonHelperFromRuntimeObject returns a new CordonHelper, or an error if given object is not a node or cannot be encoded as JSON

func (*CordonHelper) PatchOrReplace

func (c *CordonHelper) PatchOrReplace(clientset kubernetes.Interface, serverDryRun bool) (error, error)

PatchOrReplace uses given clientset to update the node status, either by patching or updating the given node object; it may return error if the object cannot be encoded as JSON, or if either patch or update calls fail; it will also return a second error whenever creating a patch has failed

func (*CordonHelper) PatchOrReplaceWithContext

func (c *CordonHelper) PatchOrReplaceWithContext(clientCtx context.Context, clientset kubernetes.Interface, serverDryRun bool) (error, error)

PatchOrReplaceWithContext provides the option to pass a custom context while updating the node status

func (*CordonHelper) UpdateIfRequired

func (c *CordonHelper) UpdateIfRequired(desired bool) bool

UpdateIfRequired returns true if c.node.Spec.Unschedulable isn't already set, or false when no change is needed

type Helper

type Helper struct {
	Ctx    context.Context
	Client kubernetes.Interface
	Force  bool

	// GracePeriodSeconds is how long to wait for a pod to terminate.
	// IMPORTANT: 0 means "delete immediately"; set to a negative value
	// to use the pod's terminationGracePeriodSeconds.
	GracePeriodSeconds int

	IgnoreAllDaemonSets bool
	IgnoreErrors        bool
	Timeout             time.Duration
	DeleteEmptyDirData  bool
	Selector            string
	PodSelector         string

	// DisableEviction forces drain to use delete rather than evict
	DisableEviction bool

	// SkipWaitForDeleteTimeoutSeconds ignores pods that have a
	// DeletionTimeStamp > N seconds. It's up to the user to decide when this
	// option is appropriate; examples include the Node is unready and the pods
	// won't drain otherwise
	SkipWaitForDeleteTimeoutSeconds int

	// AdditionalFilters are applied sequentially after base drain filters to
	// exclude pods using custom logic.  Any filter that returns PodDeleteStatus
	// with Delete == false will immediately stop execution of further filters.
	AdditionalFilters []PodFilter

	Out    io.Writer
	ErrOut io.Writer

	// OnPodDeletedOrEvicted is called when a pod is evicted/deleted; for printing progress output
	OnPodDeletedOrEvicted func(pod *corev1.Pod, usingEviction bool)
}

Helper contains the parameters to control the behaviour of drainer

func NewDrainer

func NewDrainer(kubeClient kubernetes.Interface, errOut io.Writer) *Helper

func (*Helper) DeleteOrEvictPods

func (d *Helper) DeleteOrEvictPods(pods []corev1.Pod) error

DeleteOrEvictPods deletes or evicts the pods on the api server

func (*Helper) DeletePod

func (d *Helper) DeletePod(pod corev1.Pod) error

DeletePod will delete the given pod, or return an error if it couldn't

func (*Helper) EvictPod

func (d *Helper) EvictPod(pod corev1.Pod, policyGroupVersion string) error

EvictPod will evict the give pod, or return an error if it couldn't

func (*Helper) GetPodsForDeletion

func (d *Helper) GetPodsForDeletion(nodeName string) (*PodDeleteList, []error)

GetPodsForDeletion receives resource info for a node, and returns those pods as PodDeleteList, or error if it cannot list pods. All pods that are ready to be deleted can be obtained with .Pods(), and string with all warning can be obtained with .Warnings(), and .Errors() for all errors that occurred during deletion.

type PodDelete

type PodDelete struct {
	Pod    corev1.Pod
	Status PodDeleteStatus
}

PodDelete informs filtering logic whether a pod should be deleted or not

type PodDeleteList

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

PodDeleteList is a wrapper around []PodDelete

func (*PodDeleteList) Pods

func (l *PodDeleteList) Pods() []corev1.Pod

Pods returns a list of all pods marked for deletion after filtering.

func (*PodDeleteList) Warnings

func (l *PodDeleteList) Warnings() string

Warnings returns all warning messages concatenated into a string.

type PodDeleteStatus

type PodDeleteStatus struct {
	Delete  bool
	Reason  string
	Message string
}

PodDeleteStatus informs filters if a pod should be deleted

func MakePodDeleteStatusOkay

func MakePodDeleteStatusOkay() PodDeleteStatus

MakePodDeleteStatusOkay is a helper method to return the corresponding PodDeleteStatus

func MakePodDeleteStatusSkip

func MakePodDeleteStatusSkip() PodDeleteStatus

MakePodDeleteStatusSkip is a helper method to return the corresponding PodDeleteStatus

func MakePodDeleteStatusWithError

func MakePodDeleteStatusWithError(message string) PodDeleteStatus

MakePodDeleteStatusWithError is a helper method to return the corresponding PodDeleteStatus

func MakePodDeleteStatusWithWarning

func MakePodDeleteStatusWithWarning(delete bool, message string) PodDeleteStatus

MakePodDeleteStatusWithWarning is a helper method to return the corresponding PodDeleteStatus

type PodFilter

type PodFilter func(corev1.Pod) PodDeleteStatus

PodFilter takes a pod and returns a PodDeleteStatus