daemon

Documentation

Overview

Package daemon contains logic for watching and synchronizing daemons.

Index

• Constants
• func Match(ds *apps.DaemonSet, history *apps.ControllerRevision) (bool, error)
• func NewPod(ds *apps.DaemonSet, nodeName string) *v1.Pod
• func NodeShouldRunDaemonPod(node *v1.Node, ds *apps.DaemonSet) (bool, bool)
• type DaemonSetsController
  • func NewDaemonSetsController(daemonSetInformer appsinformers.DaemonSetInformer, ...) (*DaemonSetsController, error)
  • func (dsc *DaemonSetsController) Run(ctx context.Context, workers int)

Constants

const (
	// BurstReplicas is a rate limiter for booting pods on a lot of pods.
	// The value of 250 is chosen b/c values that are too high can cause registry DoS issues.
	BurstReplicas = 250

	// StatusUpdateRetries limits the number of retries if sending a status update to API server fails.
	StatusUpdateRetries = 1

	// BackoffGCInterval is the time that has to pass before next iteration of backoff GC is run
	BackoffGCInterval = 1 * time.Minute
)

const (
	// SelectingAllReason is added to an event when a DaemonSet selects all Pods.
	SelectingAllReason = "SelectingAll"
	// FailedPlacementReason is added to an event when a DaemonSet can't schedule a Pod to a specified node.
	FailedPlacementReason = "FailedPlacement"
	// FailedDaemonPodReason is added to an event when the status of a Pod of a DaemonSet is 'Failed'.
	FailedDaemonPodReason = "FailedDaemonPod"
	// SucceededDaemonPodReason is added to an event when the status of a Pod of a DaemonSet is 'Succeeded'.
	SucceededDaemonPodReason = "SucceededDaemonPod"
)

Reasons for DaemonSet events

Functions

func Match

func Match(ds *apps.DaemonSet, history *apps.ControllerRevision) (bool, error)

Match check if the given DaemonSet's template matches the template stored in the given history.

func NewPod

func NewPod(ds *apps.DaemonSet, nodeName string) *v1.Pod

NewPod creates a new pod

func NodeShouldRunDaemonPod

func NodeShouldRunDaemonPod(node *v1.Node, ds *apps.DaemonSet) (bool, bool)

NodeShouldRunDaemonPod checks a set of preconditions against a (node,daemonset) and returns a summary. Returned booleans are:

• shouldRun: Returns true when a daemonset should run on the node if a daemonset pod is not already running on that node.
• shouldContinueRunning: Returns true when a daemonset should continue running on a node if a daemonset pod is already running on that node.

Types

type DaemonSetsController

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

DaemonSetsController is responsible for synchronizing DaemonSet objects stored in the system with actual running pods.

func NewDaemonSetsController

func NewDaemonSetsController(
	daemonSetInformer appsinformers.DaemonSetInformer,
	historyInformer appsinformers.ControllerRevisionInformer,
	podInformer coreinformers.PodInformer,
	nodeInformer coreinformers.NodeInformer,
	kubeClient clientset.Interface,
	failedPodsBackoff *flowcontrol.Backoff,
) (*DaemonSetsController, error)

NewDaemonSetsController creates a new DaemonSetsController

func (*DaemonSetsController) Run

func (dsc *DaemonSetsController) Run(ctx context.Context, workers int)

Run begins watching and syncing daemon sets.