controller

package
v1.1.3 Latest Latest
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 Go to latest Published: Feb 17, 2016 License: Apache-2.0 Imports: 15 Imported by: 0

Documentation

Overview

Package controller contains code for controllers (like the replication controller).

Index

Constants

View Source 
const (
	CreatedByAnnotation = "kubernetes.io/created-by"

	// If a watch drops a delete event for a pod, it'll take this long
	// before a dormant controller waiting for those packets is woken up anyway. It is
	// specifically targeted at the case where some problem prevents an update
	// of expectations, without it the controller could stay asleep forever. This should
	// be set based on the expected latency of watch events.
	//
	// Currently a controller can service (create *and* observe the watch events for said
	// creation) about 10-20 pods a second, so it takes about 1 min to service
	// 500 pods. Just creation is limited to 20qps, and watching happens with ~10-30s
	// latency/pod at the scale of 3000 pods over 100 nodes.
	ExpectationsTimeout = 3 * time.Minute
)

Variables

View Source 
var ExpKeyFunc = func(obj interface{}) (string, error) {
	if e, ok := obj.(*ControlleeExpectations); ok {
		return e.key, nil
	}
	return "", fmt.Errorf("Could not find key for obj %#v", obj)
}

ExpKeyFunc to parse out the key from a ControlleeExpectation

View Source 
var (
	KeyFunc = framework.DeletionHandlingMetaNamespaceKeyFunc
)

Functions

func FilterActivePods 

func FilterActivePods(pods []api.Pod) []*api.Pod

FilterActivePods returns pods that have not terminated.

func NoResyncPeriodFunc added in v1.0.7 

func NoResyncPeriodFunc() time.Duration

Returns 0 for resyncPeriod in case resyncing is not needed.

func SyncAllPodsWithStore added in v1.1.3 

func SyncAllPodsWithStore(kubeClient client.Interface, store cache.Store)

SyncAllPodsWithStore lists all pods and inserts them into the given store. Though this function is written in a generic manner, it is only used by the controllers for a specific purpose, to synchronously populate the store with the first batch of pods that would otherwise be sent by the Informer. Doing this avoids more complicated forms of synchronization with the Informer, though it also means that the controller calling this function will receive "OnUpdate" events for all the pods in the store, instead of "OnAdd". This should be ok, since most controllers are level triggered and make decisions based on the contents of the store.

TODO: Extend this logic to load arbitrary local state for the controllers instead of just pods.

Types

type ActivePods 

type ActivePods []*api.Pod

ActivePods type allows custom sorting of pods so a controller can pick the best ones to delete.

func (ActivePods) Len 

func (s ActivePods) Len() int

func (ActivePods) Less 

func (s ActivePods) Less(i, j int) bool

func (ActivePods) Swap 

func (s ActivePods) Swap(i, j int)

type ControlleeExpectations added in v1.1.3 

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

ControlleeExpectations track controllee creates/deletes.

func (*ControlleeExpectations) Fulfilled added in v1.1.3 

func (e *ControlleeExpectations) Fulfilled() bool

Fulfilled returns true if this expectation has been fulfilled.

func (*ControlleeExpectations) GetExpectations added in v1.1.3 

func (e *ControlleeExpectations) GetExpectations() (int64, int64)

GetExpectations returns the add and del expectations of the controllee.

func (*ControlleeExpectations) Seen added in v1.1.3 

func (e *ControlleeExpectations) Seen(add, del int64)

Seen decrements the add and del counters.

type ControllerExpectations 

type ControllerExpectations struct {
	cache.Store
}

ControllerExpectations is a ttl cache mapping controllers to what they expect to see before being woken up for a sync.

func NewControllerExpectations 

func NewControllerExpectations() *ControllerExpectations

NewControllerExpectations returns a store for ControlleeExpectations.

func (*ControllerExpectations) CreationObserved 

func (r *ControllerExpectations) CreationObserved(controllerKey string)

CreationObserved atomically decrements the `add` expecation count of the given controller.

func (*ControllerExpectations) DeleteExpectations 

func (r *ControllerExpectations) DeleteExpectations(controllerKey string)

DeleteExpectations deletes the expectations of the given controller from the TTLStore.

func (*ControllerExpectations) DeletionObserved 

func (r *ControllerExpectations) DeletionObserved(controllerKey string)

DeletionObserved atomically decrements the `del` expectation count of the given controller.

func (*ControllerExpectations) ExpectCreations 

func (r *ControllerExpectations) ExpectCreations(controllerKey string, adds int) error

func (*ControllerExpectations) ExpectDeletions 

func (r *ControllerExpectations) ExpectDeletions(controllerKey string, dels int) error

func (*ControllerExpectations) GetExpectations 

func (r *ControllerExpectations) GetExpectations(controllerKey string) (*ControlleeExpectations, bool, error)

GetExpectations returns the ControlleeExpectations of the given controller.

func (*ControllerExpectations) SatisfiedExpectations 

func (r *ControllerExpectations) SatisfiedExpectations(controllerKey string) bool

SatisfiedExpectations returns true if the required adds/dels for the given controller have been observed. Add/del counts are established by the controller at sync time, and updated as controllees are observed by the controller manager.

func (*ControllerExpectations) SetExpectations 

func (r *ControllerExpectations) SetExpectations(controllerKey string, add, del int) error

SetExpectations registers new expectations for the given controller. Forgets existing expectations.

type ControllerExpectationsInterface 

type ControllerExpectationsInterface interface {
	GetExpectations(controllerKey string) (*ControlleeExpectations, bool, error)
	SatisfiedExpectations(controllerKey string) bool
	DeleteExpectations(controllerKey string)
	SetExpectations(controllerKey string, add, del int) error
	ExpectCreations(controllerKey string, adds int) error
	ExpectDeletions(controllerKey string, dels int) error
	CreationObserved(controllerKey string)
	DeletionObserved(controllerKey string)
}

ControllerExpectationsInterface is an interface that allows users to set and wait on expectations. Only abstracted out for testing. Warning: if using KeyFunc it is not safe to use a single ControllerExpectationsInterface with different types of controllers, because the keys might conflict across types.

type Expectations 

type Expectations interface {
	Fulfilled() bool
}

Expectations are either fulfilled, or expire naturally.

type FakePodControl added in v1.0.7 

type FakePodControl struct {
	sync.Mutex
	Templates     []api.PodTemplateSpec
	DeletePodName []string
	Err           error
}

func (*FakePodControl) Clear added in v1.0.7 

func (f *FakePodControl) Clear()

func (*FakePodControl) CreatePods added in v1.0.7 

func (f *FakePodControl) CreatePods(namespace string, spec *api.PodTemplateSpec, object runtime.Object) error

func (*FakePodControl) CreatePodsOnNode added in v1.0.7 

func (f *FakePodControl) CreatePodsOnNode(nodeName, namespace string, template *api.PodTemplateSpec, object runtime.Object) error

func (*FakePodControl) DeletePod added in v1.0.7 

func (f *FakePodControl) DeletePod(namespace string, podID string, object runtime.Object) error

type PodControlInterface 

type PodControlInterface interface {
	// CreatePods creates new pods according to the spec.
	CreatePods(namespace string, template *api.PodTemplateSpec, object runtime.Object) error
	// CreatePodsOnNode creates a new pod accorting to the spec on the specified node.
	CreatePodsOnNode(nodeName, namespace string, template *api.PodTemplateSpec, object runtime.Object) error
	// DeletePod deletes the pod identified by podID.
	DeletePod(namespace string, podID string, object runtime.Object) error
}

PodControlInterface is an interface that knows how to add or delete pods created as an interface to allow testing.

type RealPodControl 

type RealPodControl struct {
	KubeClient client.Interface
	Recorder   record.EventRecorder
}

RealPodControl is the default implementation of PodControlInterface.

func (RealPodControl) CreatePods added in v1.0.7 

func (r RealPodControl) CreatePods(namespace string, template *api.PodTemplateSpec, object runtime.Object) error

func (RealPodControl) CreatePodsOnNode added in v1.0.7 

func (r RealPodControl) CreatePodsOnNode(nodeName, namespace string, template *api.PodTemplateSpec, object runtime.Object) error

func (RealPodControl) DeletePod 

func (r RealPodControl) DeletePod(namespace string, podID string, object runtime.Object) error

type ResyncPeriodFunc added in v1.0.7 

type ResyncPeriodFunc func() time.Duration

func StaticResyncPeriodFunc added in v1.1.2 

func StaticResyncPeriodFunc(resyncPeriod time.Duration) ResyncPeriodFunc

StaticResyncPeriodFunc returns the resync period specified

Source Files

View all Source files

Directories

Path Synopsis
Package daemon contains logic for watching and synchronizing daemons.
 Package daemon contains logic for watching and synchronizing daemons.
Package service provides EndpointController implementation to manage and sync service endpoints.
 Package service provides EndpointController implementation to manage and sync service endpoints.
Package framework implements all the grunt work involved in running a simple controller.
 Package framework implements all the grunt work involved in running a simple controller.
Package gc contains a very simple pod "garbage collector" implementation, GCController, that runs in the controller manager.
 Package gc contains a very simple pod "garbage collector" implementation, GCController, that runs in the controller manager.
Package job contains logic for watching and synchronizing jobs.
 Package job contains logic for watching and synchronizing jobs.
namespace contains a controller that handles namespace lifecycle
 namespace contains a controller that handles namespace lifecycle
Package node contains code for syncing cloud instances with node registry
 Package node contains code for syncing cloud instances with node registry
metrics
Package replication contains logic for watching and synchronizing replication controllers.
 Package replication contains logic for watching and synchronizing replication controllers.
resourcequota contains a controller that makes resource quota usage observations
 resourcequota contains a controller that makes resource quota usage observations
Package route contains code for syncing cloud routing rules with the list of registered nodes.
 Package route contains code for syncing cloud routing rules with the list of registered nodes.
Package service contains code for syncing cloud load balancers with the service registry.
 Package service contains code for syncing cloud load balancers with the service registry.
Package serviceaccount provides implementations to manage service accounts and service account tokens
 Package serviceaccount provides implementations to manage service accounts and service account tokens

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