Documentation
¶
Overview ¶
Package node contains code for syncing cloud instances with node registry
Index ¶
- Constants
- Variables
- func Register()
- type ActionFunc
- type CIDRAllocator
- type NoExecuteTaintManager
- type NodeController
- type RateLimitedTimedQueue
- type TimedQueue
- type TimedValue
- type TimedWorker
- type TimedWorkerQueue
- type UniqueQueue
- func (q *UniqueQueue) Add(value TimedValue) bool
- func (q *UniqueQueue) Clear()
- func (q *UniqueQueue) Get() (TimedValue, bool)
- func (q *UniqueQueue) Head() (TimedValue, bool)
- func (q *UniqueQueue) Remove(value string) bool
- func (q *UniqueQueue) RemoveFromQueue(value string) bool
- func (q *UniqueQueue) Replace(value TimedValue) bool
- type WorkArgs
Constants ¶
const ( NodeControllerSubsystem = "node_collector" ZoneHealthStatisticKey = "zone_health" ZoneSizeKey = "zone_size" ZoneNoUnhealthyNodesKey = "unhealty_nodes_in_zone" EvictionsNumberKey = "evictions_number" )
Variables ¶
var ( ZoneHealth = prometheus.NewGaugeVec( prometheus.GaugeOpts{ Subsystem: NodeControllerSubsystem, Name: ZoneHealthStatisticKey, Help: "Gauge measuring percentage of healty nodes per zone.", }, []string{"zone"}, ) ZoneSize = prometheus.NewGaugeVec( prometheus.GaugeOpts{ Subsystem: NodeControllerSubsystem, Name: ZoneSizeKey, Help: "Gauge measuring number of registered Nodes per zones.", }, []string{"zone"}, ) UnhealthyNodes = prometheus.NewGaugeVec( prometheus.GaugeOpts{ Subsystem: NodeControllerSubsystem, Name: ZoneNoUnhealthyNodesKey, Help: "Gauge measuring number of not Ready Nodes per zones.", }, []string{"zone"}, ) EvictionsNumber = prometheus.NewCounterVec( prometheus.CounterOpts{ Subsystem: NodeControllerSubsystem, Name: EvictionsNumberKey, Help: "Number of Node evictions that happened since current instance of NodeController started.", }, []string{"zone"}, ) )
var ( ErrCloudInstance = errors.New("cloud provider doesn't support instances.") UnreachableTaintTemplate = &v1.Taint{ Key: metav1.TaintNodeUnreachable, Effect: v1.TaintEffectNoExecute, } NotReadyTaintTemplate = &v1.Taint{ Key: metav1.TaintNodeNotReady, Effect: v1.TaintEffectNoExecute, } )
Functions ¶
Types ¶
type ActionFunc ¶
type ActionFunc func(TimedValue) (bool, time.Duration)
ActionFunc takes a timed value and returns false if the item must be retried, with an optional time.Duration if some minimum wait interval should be used.
type CIDRAllocator ¶ added in v1.3.0
type CIDRAllocator interface { AllocateOrOccupyCIDR(node *v1.Node) error ReleaseCIDR(node *v1.Node) error }
CIDRAllocator is an interface implemented by things that know how to allocate/occupy/recycle CIDR for nodes.
func NewCIDRRangeAllocator ¶ added in v1.3.0
func NewCIDRRangeAllocator(client clientset.Interface, clusterCIDR *net.IPNet, serviceCIDR *net.IPNet, subNetMaskSize int, nodeList *v1.NodeList) (CIDRAllocator, error)
NewCIDRRangeAllocator returns a CIDRAllocator to allocate CIDR for node Caller must ensure subNetMaskSize is not less than cluster CIDR mask size. Caller must always pass in a list of existing nodes so the new allocator can initialize its CIDR map. NodeList is only nil in testing.
type NoExecuteTaintManager ¶ added in v1.6.0
type NoExecuteTaintManager struct {
// contains filtered or unexported fields
}
NoExecuteTaint manager listens to Taint/Toleration changes and is resposible for removing Pods from Nodes tainted with NoExecute Taints.
func NewNoExecuteTaintManager ¶ added in v1.6.0
func NewNoExecuteTaintManager(c clientset.Interface) *NoExecuteTaintManager
NewNoExecuteTaintManager creates a new NoExecuteTaintManager that will use passed clientset to communicate with the API server.
func (*NoExecuteTaintManager) NodeUpdated ¶ added in v1.6.0
func (tc *NoExecuteTaintManager) NodeUpdated(oldNode *v1.Node, newNode *v1.Node)
NodeUpdated is used to notify NoExecuteTaintManager about Node changes.
func (*NoExecuteTaintManager) PodUpdated ¶ added in v1.6.0
func (tc *NoExecuteTaintManager) PodUpdated(oldPod *v1.Pod, newPod *v1.Pod)
PodUpdated is used to notify NoExecuteTaintManager about Pod changes.
func (*NoExecuteTaintManager) Run ¶ added in v1.6.0
func (tc *NoExecuteTaintManager) Run(stopCh <-chan struct{})
Run starts NoExecuteTaintManager which will run in loop until `stopCh` is closed.
type NodeController ¶
type NodeController struct {
// contains filtered or unexported fields
}
func NewNodeController ¶
func NewNodeController( podInformer coreinformers.PodInformer, nodeInformer coreinformers.NodeInformer, daemonSetInformer extensionsinformers.DaemonSetInformer, cloud cloudprovider.Interface, kubeClient clientset.Interface, podEvictionTimeout time.Duration, evictionLimiterQPS float32, secondaryEvictionLimiterQPS float32, largeClusterThreshold int32, unhealthyZoneThreshold float32, nodeMonitorGracePeriod time.Duration, nodeStartupGracePeriod time.Duration, nodeMonitorPeriod time.Duration, clusterCIDR *net.IPNet, serviceCIDR *net.IPNet, nodeCIDRMaskSize int, allocateNodeCIDRs bool, runTaintManager bool, useTaintBasedEvictions bool) (*NodeController, error)
NewNodeController returns a new node controller to sync instances from cloudprovider. This method returns an error if it is unable to initialize the CIDR bitmap with podCIDRs it has already allocated to nodes. Since we don't allow podCIDR changes currently, this should be handled as a fatal error.
func (*NodeController) ComputeZoneState ¶ added in v1.4.1
func (nc *NodeController) ComputeZoneState(nodeReadyConditions []*v1.NodeCondition) (int, zoneState)
This function is expected to get a slice of NodeReadyConditions for all Nodes in a given zone. The zone is considered: - fullyDisrupted if there're no Ready Nodes, - partiallyDisrupted if at least than nc.unhealthyZoneThreshold percent of Nodes are not Ready, - normal otherwise
func (*NodeController) HealthyQPSFunc ¶ added in v1.4.1
func (nc *NodeController) HealthyQPSFunc(nodeNum int) float32
Default value for cluster eviction rate - we take nodeNum for consistency with ReducedQPSFunc.
func (*NodeController) ReducedQPSFunc ¶ added in v1.4.1
func (nc *NodeController) ReducedQPSFunc(nodeNum int) float32
If the cluster is large make evictions slower, if they're small stop evictions altogether.
func (*NodeController) Run ¶
func (nc *NodeController) Run()
Run starts an asynchronous loop that monitors the status of cluster nodes.
type RateLimitedTimedQueue ¶
type RateLimitedTimedQueue struct {
// contains filtered or unexported fields
}
RateLimitedTimedQueue is a unique item priority queue ordered by the expected next time of execution. It is also rate limited.
func NewRateLimitedTimedQueue ¶
func NewRateLimitedTimedQueue(limiter flowcontrol.RateLimiter) *RateLimitedTimedQueue
Creates new queue which will use given RateLimiter to oversee execution.
func (*RateLimitedTimedQueue) Add ¶
func (q *RateLimitedTimedQueue) Add(value string, uid interface{}) bool
Adds value to the queue to be processed. Won't add the same value(comparsion by value) a second time if it was already added and not removed.
func (*RateLimitedTimedQueue) Clear ¶ added in v1.3.0
func (q *RateLimitedTimedQueue) Clear()
Removes all items from the queue
func (*RateLimitedTimedQueue) Remove ¶
func (q *RateLimitedTimedQueue) Remove(value string) bool
Removes Node from the Evictor. The Node won't be processed until added again.
func (*RateLimitedTimedQueue) SwapLimiter ¶ added in v1.4.1
func (q *RateLimitedTimedQueue) SwapLimiter(newQPS float32)
SwapLimiter safely swaps current limiter for this queue with the passed one if capacities or qps's differ.
func (*RateLimitedTimedQueue) Try ¶
func (q *RateLimitedTimedQueue) Try(fn ActionFunc)
Try processes the queue. Ends prematurely if RateLimiter forbids an action and leak is true. Otherwise, requeues the item to be processed. Each value is processed once if fn returns true, otherwise it is added back to the queue. The returned remaining is used to identify the minimum time to execute the next item in the queue. The same value is processed only once unless Remove is explicitly called on it (it's done by the cancelPodEviction function in NodeController when Node becomes Ready again) TODO: figure out a good way to do garbage collection for all Nodes that were removed from the cluster.
type TimedQueue ¶
type TimedQueue []*TimedValue
TimedQueue is a priority heap where the lowest ProcessAt is at the front of the queue
func (TimedQueue) Len ¶
func (h TimedQueue) Len() int
func (TimedQueue) Less ¶
func (h TimedQueue) Less(i, j int) bool
func (*TimedQueue) Pop ¶
func (h *TimedQueue) Pop() interface{}
func (*TimedQueue) Push ¶
func (h *TimedQueue) Push(x interface{})
func (TimedQueue) Swap ¶
func (h TimedQueue) Swap(i, j int)
type TimedValue ¶
type TimedValue struct { Value string // UID could be anything that helps identify the value UID interface{} AddedAt time.Time ProcessAt time.Time }
TimedValue is a value that should be processed at a designated time.
type TimedWorker ¶ added in v1.6.0
type TimedWorker struct { WorkItem *WorkArgs CreatedAt time.Time FireAt time.Time Timer *time.Timer }
TimedWorker is a responsible for executing a function no earlier than at FireAt time.
func CreateWorker ¶ added in v1.6.0
func CreateWorker(args *WorkArgs, createdAt time.Time, fireAt time.Time, f func(args *WorkArgs) error) *TimedWorker
CreateWorker creates a TimedWorker that will execute `f` not earlier than `fireAt`.
func (*TimedWorker) Cancel ¶ added in v1.6.0
func (w *TimedWorker) Cancel()
Cancel cancels the execution of function by the `TimedWorker`
type TimedWorkerQueue ¶ added in v1.6.0
TimedWorkerQueue keeps a set of TimedWorkers that are still wait for execution.
func CreateWorkerQueue ¶ added in v1.6.0
func CreateWorkerQueue(f func(args *WorkArgs) error) *TimedWorkerQueue
CreateWorkerQueue creates a new TimedWorkerQueue for workers that will execute given function `f`.
func (*TimedWorkerQueue) AddWork ¶ added in v1.6.0
AddWork adds a work to the WorkerQueue which will be executed not earlier than `fireAt`.
func (*TimedWorkerQueue) CancelWork ¶ added in v1.6.0
func (q *TimedWorkerQueue) CancelWork(key string) bool
CancelWork removes scheduled function execution from the queue. Returns true if work was cancelled.
func (*TimedWorkerQueue) GetWorkerUnsafe ¶ added in v1.6.0
func (q *TimedWorkerQueue) GetWorkerUnsafe(key string) *TimedWorker
GetWorkerUnsafe returns a TimedWorker corresponding to the given key. Unsafe method - workers have attached goroutines which can fire afater this function is called.
type UniqueQueue ¶
type UniqueQueue struct {
// contains filtered or unexported fields
}
A FIFO queue which additionally guarantees that any element can be added only once until it is removed.
func (*UniqueQueue) Add ¶
func (q *UniqueQueue) Add(value TimedValue) bool
Adds a new value to the queue if it wasn't added before, or was explicitly removed by the Remove call. Returns true if new value was added.
func (*UniqueQueue) Clear ¶ added in v1.3.0
func (q *UniqueQueue) Clear()
Clear removes all items from the queue and duplication preventing set.
func (*UniqueQueue) Get ¶
func (q *UniqueQueue) Get() (TimedValue, bool)
Returns the oldest added value that wasn't returned yet.
func (*UniqueQueue) Head ¶
func (q *UniqueQueue) Head() (TimedValue, bool)
Head returns the oldest added value that wasn't returned yet without removing it.
func (*UniqueQueue) Remove ¶
func (q *UniqueQueue) Remove(value string) bool
Removes the value from the queue, so Get() call won't return it, and allow subsequent addition of the given value. If the value is not present does nothing and returns false.
func (*UniqueQueue) RemoveFromQueue ¶ added in v1.4.1
func (q *UniqueQueue) RemoveFromQueue(value string) bool
Removes the value from the queue, but keeps it in the set, so it won't be added second time. Returns true if something was removed.
func (*UniqueQueue) Replace ¶
func (q *UniqueQueue) Replace(value TimedValue) bool
Replace replaces an existing value in the queue if it already exists, otherwise it does nothing. Returns true if the item was found.
type WorkArgs ¶ added in v1.6.0
type WorkArgs struct {
NamespacedName types.NamespacedName
}
WorkArgs keeps arguments that will be passed to the function executed by the worker.
func NewWorkArgs ¶ added in v1.6.0
NewWorkArgs is a helper function to create new `WorkArgs`
func (*WorkArgs) KeyFromWorkArgs ¶ added in v1.6.0
KeyFromWorkArgs creates a key for the given `WorkArgs`