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nodecontroller.go
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nodecontroller.go
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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package node
import (
"errors"
"fmt"
"net"
"strings"
"sync"
"time"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/apis/extensions"
"k8s.io/kubernetes/pkg/client/cache"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
unversionedcore "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/unversioned"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/controller/framework"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/flowcontrol"
"k8s.io/kubernetes/pkg/util/metrics"
utilruntime "k8s.io/kubernetes/pkg/util/runtime"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/util/system"
"k8s.io/kubernetes/pkg/util/wait"
"k8s.io/kubernetes/pkg/version"
"k8s.io/kubernetes/pkg/watch"
)
var (
ErrCloudInstance = errors.New("cloud provider doesn't support instances.")
)
const (
// nodeStatusUpdateRetry controls the number of retries of writing NodeStatus update.
nodeStatusUpdateRetry = 5
// podCIDRUpdateRetry controls the number of retries of writing Node.Spec.PodCIDR update.
podCIDRUpdateRetry = 5
// controls how often NodeController will try to evict Pods from non-responsive Nodes.
nodeEvictionPeriod = 100 * time.Millisecond
// controls how many NodeSpec updates NC can process in any moment.
cidrUpdateWorkers = 10
cidrUpdateQueueSize = 5000
)
type nodeStatusData struct {
probeTimestamp unversioned.Time
readyTransitionTimestamp unversioned.Time
status api.NodeStatus
}
type nodeAndCIDR struct {
nodeName string
cidr *net.IPNet
}
type NodeController struct {
allocateNodeCIDRs bool
cloud cloudprovider.Interface
clusterCIDR *net.IPNet
serviceCIDR *net.IPNet
deletingPodsRateLimiter flowcontrol.RateLimiter
knownNodeSet sets.String
kubeClient clientset.Interface
// Method for easy mocking in unittest.
lookupIP func(host string) ([]net.IP, error)
// Value used if sync_nodes_status=False. NodeController will not proactively
// sync node status in this case, but will monitor node status updated from kubelet. If
// it doesn't receive update for this amount of time, it will start posting "NodeReady==
// ConditionUnknown". The amount of time before which NodeController start evicting pods
// is controlled via flag 'pod-eviction-timeout'.
// Note: be cautious when changing the constant, it must work with nodeStatusUpdateFrequency
// in kubelet. There are several constraints:
// 1. nodeMonitorGracePeriod must be N times more than nodeStatusUpdateFrequency, where
// N means number of retries allowed for kubelet to post node status. It is pointless
// to make nodeMonitorGracePeriod be less than nodeStatusUpdateFrequency, since there
// will only be fresh values from Kubelet at an interval of nodeStatusUpdateFrequency.
// The constant must be less than podEvictionTimeout.
// 2. nodeMonitorGracePeriod can't be too large for user experience - larger value takes
// longer for user to see up-to-date node status.
nodeMonitorGracePeriod time.Duration
// Value controlling NodeController monitoring period, i.e. how often does NodeController
// check node status posted from kubelet. This value should be lower than nodeMonitorGracePeriod.
// TODO: Change node status monitor to watch based.
nodeMonitorPeriod time.Duration
// Value used if sync_nodes_status=False, only for node startup. When node
// is just created, e.g. cluster bootstrap or node creation, we give a longer grace period.
nodeStartupGracePeriod time.Duration
// per Node map storing last observed Status together with a local time when it was observed.
// This timestamp is to be used instead of LastProbeTime stored in Condition. We do this
// to aviod the problem with time skew across the cluster.
nodeStatusMap map[string]nodeStatusData
now func() unversioned.Time
// Lock to access evictor workers
evictorLock *sync.Mutex
// workers that evicts pods from unresponsive nodes.
podEvictor *RateLimitedTimedQueue
terminationEvictor *RateLimitedTimedQueue
podEvictionTimeout time.Duration
// The maximum duration before a pod evicted from a node can be forcefully terminated.
maximumGracePeriod time.Duration
recorder record.EventRecorder
// Pod framework and store
podController *framework.Controller
podStore cache.StoreToPodLister
// Node framework and store
nodeController *framework.Controller
nodeStore cache.StoreToNodeLister
// DaemonSet framework and store
daemonSetController *framework.Controller
daemonSetStore cache.StoreToDaemonSetLister
// allocate/recycle CIDRs for node if allocateNodeCIDRs == true
cidrAllocator CIDRAllocator
forcefullyDeletePod func(*api.Pod) error
nodeExistsInCloudProvider func(string) (bool, error)
// If in network segmentation mode NodeController won't evict Pods from unhealthy Nodes.
// It is enabled when all Nodes observed by the NodeController are NotReady and disabled
// when NC sees any healthy Node. This is a temporary fix for v1.3.
networkSegmentationMode bool
nodeCIDRUpdateChannel chan nodeAndCIDR
}
// NewNodeController returns a new node controller to sync instances from cloudprovider.
func NewNodeController(
cloud cloudprovider.Interface,
kubeClient clientset.Interface,
podEvictionTimeout time.Duration,
deletionEvictionLimiter flowcontrol.RateLimiter,
terminationEvictionLimiter flowcontrol.RateLimiter,
nodeMonitorGracePeriod time.Duration,
nodeStartupGracePeriod time.Duration,
nodeMonitorPeriod time.Duration,
clusterCIDR *net.IPNet,
serviceCIDR *net.IPNet,
nodeCIDRMaskSize int,
allocateNodeCIDRs bool) *NodeController {
eventBroadcaster := record.NewBroadcaster()
recorder := eventBroadcaster.NewRecorder(api.EventSource{Component: "controllermanager"})
eventBroadcaster.StartLogging(glog.Infof)
if kubeClient != nil {
glog.V(0).Infof("Sending events to api server.")
eventBroadcaster.StartRecordingToSink(&unversionedcore.EventSinkImpl{Interface: kubeClient.Core().Events("")})
} else {
glog.V(0).Infof("No api server defined - no events will be sent to API server.")
}
if kubeClient != nil && kubeClient.Core().GetRESTClient().GetRateLimiter() != nil {
metrics.RegisterMetricAndTrackRateLimiterUsage("node_controller", kubeClient.Core().GetRESTClient().GetRateLimiter())
}
if allocateNodeCIDRs {
if clusterCIDR == nil {
glog.Fatal("NodeController: Must specify clusterCIDR if allocateNodeCIDRs == true.")
}
mask := clusterCIDR.Mask
if maskSize, _ := mask.Size(); maskSize > nodeCIDRMaskSize {
glog.Fatal("NodeController: Invalid clusterCIDR, mask size of clusterCIDR must be less than nodeCIDRMaskSize.")
}
}
evictorLock := sync.Mutex{}
nc := &NodeController{
cloud: cloud,
knownNodeSet: make(sets.String),
kubeClient: kubeClient,
recorder: recorder,
podEvictionTimeout: podEvictionTimeout,
maximumGracePeriod: 5 * time.Minute,
evictorLock: &evictorLock,
podEvictor: NewRateLimitedTimedQueue(deletionEvictionLimiter),
terminationEvictor: NewRateLimitedTimedQueue(terminationEvictionLimiter),
nodeStatusMap: make(map[string]nodeStatusData),
nodeMonitorGracePeriod: nodeMonitorGracePeriod,
nodeMonitorPeriod: nodeMonitorPeriod,
nodeStartupGracePeriod: nodeStartupGracePeriod,
lookupIP: net.LookupIP,
now: unversioned.Now,
clusterCIDR: clusterCIDR,
serviceCIDR: serviceCIDR,
allocateNodeCIDRs: allocateNodeCIDRs,
forcefullyDeletePod: func(p *api.Pod) error { return forcefullyDeletePod(kubeClient, p) },
nodeExistsInCloudProvider: func(nodeName string) (bool, error) { return nodeExistsInCloudProvider(cloud, nodeName) },
nodeCIDRUpdateChannel: make(chan nodeAndCIDR, cidrUpdateQueueSize),
}
nc.podStore.Indexer, nc.podController = framework.NewIndexerInformer(
&cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return nc.kubeClient.Core().Pods(api.NamespaceAll).List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return nc.kubeClient.Core().Pods(api.NamespaceAll).Watch(options)
},
},
&api.Pod{},
controller.NoResyncPeriodFunc(),
framework.ResourceEventHandlerFuncs{
AddFunc: nc.maybeDeleteTerminatingPod,
UpdateFunc: func(_, obj interface{}) { nc.maybeDeleteTerminatingPod(obj) },
},
// We don't need to build a index for podStore here actually, but build one for consistency.
// It will ensure that if people start making use of the podStore in more specific ways,
// they'll get the benefits they expect. It will also reserve the name for future refactorings.
cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
nodeEventHandlerFuncs := framework.ResourceEventHandlerFuncs{}
if nc.allocateNodeCIDRs {
nodeEventHandlerFuncs = framework.ResourceEventHandlerFuncs{
AddFunc: nc.allocateOrOccupyCIDR,
DeleteFunc: nc.recycleCIDR,
}
}
nc.nodeStore.Store, nc.nodeController = framework.NewInformer(
&cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return nc.kubeClient.Core().Nodes().List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return nc.kubeClient.Core().Nodes().Watch(options)
},
},
&api.Node{},
controller.NoResyncPeriodFunc(),
nodeEventHandlerFuncs,
)
nc.daemonSetStore.Store, nc.daemonSetController = framework.NewInformer(
&cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return nc.kubeClient.Extensions().DaemonSets(api.NamespaceAll).List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return nc.kubeClient.Extensions().DaemonSets(api.NamespaceAll).Watch(options)
},
},
&extensions.DaemonSet{},
controller.NoResyncPeriodFunc(),
framework.ResourceEventHandlerFuncs{},
)
if allocateNodeCIDRs {
nc.cidrAllocator = NewCIDRRangeAllocator(clusterCIDR, nodeCIDRMaskSize)
}
return nc
}
// Run starts an asynchronous loop that monitors the status of cluster nodes.
func (nc *NodeController) Run(period time.Duration) {
if nc.allocateNodeCIDRs {
if nc.serviceCIDR != nil {
nc.filterOutServiceRange()
} else {
glog.Info("No Service CIDR provided. Skipping filtering out service addresses.")
}
}
go nc.nodeController.Run(wait.NeverStop)
go nc.podController.Run(wait.NeverStop)
go nc.daemonSetController.Run(wait.NeverStop)
// Incorporate the results of node status pushed from kubelet to master.
go wait.Until(func() {
if err := nc.monitorNodeStatus(); err != nil {
glog.Errorf("Error monitoring node status: %v", err)
}
}, nc.nodeMonitorPeriod, wait.NeverStop)
// Managing eviction of nodes:
// 1. when we delete pods off a node, if the node was not empty at the time we then
// queue a termination watcher
// a. If we hit an error, retry deletion
// 2. The terminator loop ensures that pods are eventually cleaned and we never
// terminate a pod in a time period less than nc.maximumGracePeriod. AddedAt
// is the time from which we measure "has this pod been terminating too long",
// after which we will delete the pod with grace period 0 (force delete).
// a. If we hit errors, retry instantly
// b. If there are no pods left terminating, exit
// c. If there are pods still terminating, wait for their estimated completion
// before retrying
go wait.Until(func() {
nc.evictorLock.Lock()
defer nc.evictorLock.Unlock()
nc.podEvictor.Try(func(value TimedValue) (bool, time.Duration) {
remaining, err := nc.deletePods(value.Value)
if err != nil {
utilruntime.HandleError(fmt.Errorf("unable to evict node %q: %v", value.Value, err))
return false, 0
}
if remaining {
nc.terminationEvictor.Add(value.Value)
}
return true, 0
})
}, nodeEvictionPeriod, wait.NeverStop)
// TODO: replace with a controller that ensures pods that are terminating complete
// in a particular time period
go wait.Until(func() {
nc.evictorLock.Lock()
defer nc.evictorLock.Unlock()
nc.terminationEvictor.Try(func(value TimedValue) (bool, time.Duration) {
completed, remaining, err := nc.terminatePods(value.Value, value.AddedAt)
if err != nil {
utilruntime.HandleError(fmt.Errorf("unable to terminate pods on node %q: %v", value.Value, err))
return false, 0
}
if completed {
glog.V(2).Infof("All pods terminated on %s", value.Value)
nc.recordNodeEvent(value.Value, api.EventTypeNormal, "TerminatedAllPods", fmt.Sprintf("Terminated all Pods on Node %s.", value.Value))
return true, 0
}
glog.V(2).Infof("Pods terminating since %s on %q, estimated completion %s", value.AddedAt, value.Value, remaining)
// clamp very short intervals
if remaining < nodeEvictionPeriod {
remaining = nodeEvictionPeriod
}
return false, remaining
})
}, nodeEvictionPeriod, wait.NeverStop)
go wait.Until(nc.cleanupOrphanedPods, 30*time.Second, wait.NeverStop)
for i := 0; i < cidrUpdateWorkers; i++ {
go func(stopChan <-chan struct{}) {
for {
select {
case workItem, ok := <-nc.nodeCIDRUpdateChannel:
if !ok {
glog.Warning("NodeCIDRUpdateChannel read returned false.")
return
}
nc.updateCIDRAllocation(workItem)
case <-stopChan:
glog.V(0).Info("StopChannel is closed.")
return
}
}
}(wait.NeverStop)
}
}
func (nc *NodeController) filterOutServiceRange() {
if !nc.clusterCIDR.Contains(nc.serviceCIDR.IP.Mask(nc.clusterCIDR.Mask)) && !nc.serviceCIDR.Contains(nc.clusterCIDR.IP.Mask(nc.serviceCIDR.Mask)) {
return
}
if err := nc.cidrAllocator.Occupy(nc.serviceCIDR); err != nil {
glog.Errorf("Error filtering out service cidr: %v", err)
}
}
func (nc *NodeController) updateCIDRAllocation(data nodeAndCIDR) {
var err error
var node *api.Node
for rep := 0; rep < podCIDRUpdateRetry; rep++ {
node, err = nc.kubeClient.Core().Nodes().Get(data.nodeName)
if err != nil {
glog.Errorf("Failed while getting node %v to retry updating Node.Spec.PodCIDR: %v", data.nodeName, err)
continue
}
node.Spec.PodCIDR = data.cidr.String()
if _, err := nc.kubeClient.Core().Nodes().Update(node); err != nil {
glog.Errorf("Failed while updating Node.Spec.PodCIDR (%d retries left): %v", podCIDRUpdateRetry-rep-1, err)
} else {
break
}
}
if err != nil {
nc.recordNodeStatusChange(node, "CIDRAssignmentFailed")
glog.Errorf("CIDR assignment for node %v failed: %v. Releasing allocated CIDR", data.nodeName, err)
err := nc.cidrAllocator.Release(data.cidr)
glog.Errorf("Error releasing allocated CIDR for node %v: %v", data.nodeName, err)
}
}
// allocateOrOccupyCIDR looks at each new observed node, assigns it a valid CIDR
// if it doesn't currently have one or mark the CIDR as used if the node already have one.
func (nc *NodeController) allocateOrOccupyCIDR(obj interface{}) {
node := obj.(*api.Node)
if node.Spec.PodCIDR != "" {
_, podCIDR, err := net.ParseCIDR(node.Spec.PodCIDR)
if err != nil {
glog.Errorf("failed to parse node %s, CIDR %s", node.Name, node.Spec.PodCIDR)
return
}
if err := nc.cidrAllocator.Occupy(podCIDR); err != nil {
glog.Errorf("failed to mark cidr as occupied :%v", err)
return
}
return
}
podCIDR, err := nc.cidrAllocator.AllocateNext()
if err != nil {
nc.recordNodeStatusChange(node, "CIDRNotAvailable")
return
}
glog.V(4).Infof("Putting node %s with CIDR %s into the work queue", node.Name, podCIDR)
nc.nodeCIDRUpdateChannel <- nodeAndCIDR{
nodeName: node.Name,
cidr: podCIDR,
}
}
// recycleCIDR recycles the CIDR of a removed node
func (nc *NodeController) recycleCIDR(obj interface{}) {
node := obj.(*api.Node)
if node.Spec.PodCIDR == "" {
return
}
_, podCIDR, err := net.ParseCIDR(node.Spec.PodCIDR)
if err != nil {
glog.Errorf("failed to parse node %s, CIDR %s", node.Name, node.Spec.PodCIDR)
return
}
glog.V(4).Infof("recycle node %s CIDR %s", node.Name, podCIDR)
if err := nc.cidrAllocator.Release(podCIDR); err != nil {
glog.Errorf("failed to release cidr: %v", err)
}
}
var gracefulDeletionVersion = version.MustParse("v1.1.0")
// maybeDeleteTerminatingPod non-gracefully deletes pods that are terminating
// that should not be gracefully terminated.
func (nc *NodeController) maybeDeleteTerminatingPod(obj interface{}) {
pod, ok := obj.(*api.Pod)
if !ok {
return
}
// consider only terminating pods
if pod.DeletionTimestamp == nil {
return
}
// delete terminating pods that have not yet been scheduled
if len(pod.Spec.NodeName) == 0 {
utilruntime.HandleError(nc.forcefullyDeletePod(pod))
return
}
nodeObj, found, err := nc.nodeStore.GetByKey(pod.Spec.NodeName)
if err != nil {
// this can only happen if the Store.KeyFunc has a problem creating
// a key for the pod. If it happens once, it will happen again so
// don't bother requeuing the pod.
utilruntime.HandleError(err)
return
}
// delete terminating pods that have been scheduled on
// nonexistent nodes
if !found {
glog.Warningf("Unable to find Node: %v, deleting all assigned Pods.", pod.Spec.NodeName)
utilruntime.HandleError(nc.forcefullyDeletePod(pod))
return
}
// delete terminating pods that have been scheduled on
// nodes that do not support graceful termination
// TODO(mikedanese): this can be removed when we no longer
// guarantee backwards compatibility of master API to kubelets with
// versions less than 1.1.0
node := nodeObj.(*api.Node)
v, err := version.Parse(node.Status.NodeInfo.KubeletVersion)
if err != nil {
glog.V(0).Infof("couldn't parse verions %q of minion: %v", node.Status.NodeInfo.KubeletVersion, err)
utilruntime.HandleError(nc.forcefullyDeletePod(pod))
return
}
if gracefulDeletionVersion.GT(v) {
utilruntime.HandleError(nc.forcefullyDeletePod(pod))
return
}
}
// cleanupOrphanedPods deletes pods that are bound to nodes that don't
// exist.
func (nc *NodeController) cleanupOrphanedPods() {
pods, err := nc.podStore.List(labels.Everything())
if err != nil {
utilruntime.HandleError(err)
return
}
for _, pod := range pods {
if pod.Spec.NodeName == "" {
continue
}
if _, exists, _ := nc.nodeStore.Store.GetByKey(pod.Spec.NodeName); exists {
continue
}
if err := nc.forcefullyDeletePod(pod); err != nil {
utilruntime.HandleError(err)
}
}
}
func forcefullyDeletePod(c clientset.Interface, pod *api.Pod) error {
var zero int64
err := c.Core().Pods(pod.Namespace).Delete(pod.Name, &api.DeleteOptions{GracePeriodSeconds: &zero})
if err == nil {
glog.V(4).Infof("forceful deletion of %s succeeded", pod.Name)
}
return err
}
// monitorNodeStatus verifies node status are constantly updated by kubelet, and if not,
// post "NodeReady==ConditionUnknown". It also evicts all pods if node is not ready or
// not reachable for a long period of time.
func (nc *NodeController) monitorNodeStatus() error {
nodes, err := nc.kubeClient.Core().Nodes().List(api.ListOptions{})
if err != nil {
return err
}
for _, node := range nodes.Items {
if !nc.knownNodeSet.Has(node.Name) {
glog.V(1).Infof("NodeController observed a new Node: %#v", node)
nc.recordNodeEvent(node.Name, api.EventTypeNormal, "RegisteredNode", fmt.Sprintf("Registered Node %v in NodeController", node.Name))
nc.cancelPodEviction(node.Name)
nc.knownNodeSet.Insert(node.Name)
}
}
// If there's a difference between lengths of known Nodes and observed nodes
// we must have removed some Node.
if len(nc.knownNodeSet) != len(nodes.Items) {
observedSet := make(sets.String)
for _, node := range nodes.Items {
observedSet.Insert(node.Name)
}
deleted := nc.knownNodeSet.Difference(observedSet)
for nodeName := range deleted {
glog.V(1).Infof("NodeController observed a Node deletion: %v", nodeName)
nc.recordNodeEvent(nodeName, api.EventTypeNormal, "RemovingNode", fmt.Sprintf("Removing Node %v from NodeController", nodeName))
nc.evictPods(nodeName)
nc.knownNodeSet.Delete(nodeName)
}
}
seenReady := false
for i := range nodes.Items {
var gracePeriod time.Duration
var observedReadyCondition api.NodeCondition
var currentReadyCondition *api.NodeCondition
node := &nodes.Items[i]
for rep := 0; rep < nodeStatusUpdateRetry; rep++ {
gracePeriod, observedReadyCondition, currentReadyCondition, err = nc.tryUpdateNodeStatus(node)
if err == nil {
break
}
name := node.Name
node, err = nc.kubeClient.Core().Nodes().Get(name)
if err != nil {
glog.Errorf("Failed while getting a Node to retry updating NodeStatus. Probably Node %s was deleted.", name)
break
}
}
if err != nil {
glog.Errorf("Update status of Node %v from NodeController exceeds retry count."+
"Skipping - no pods will be evicted.", node.Name)
continue
}
decisionTimestamp := nc.now()
if currentReadyCondition != nil {
// Check eviction timeout against decisionTimestamp
if observedReadyCondition.Status == api.ConditionFalse &&
decisionTimestamp.After(nc.nodeStatusMap[node.Name].readyTransitionTimestamp.Add(nc.podEvictionTimeout)) {
if nc.evictPods(node.Name) {
glog.V(4).Infof("Evicting pods on node %s: %v is later than %v + %v", node.Name, decisionTimestamp, nc.nodeStatusMap[node.Name].readyTransitionTimestamp, nc.podEvictionTimeout)
}
}
if observedReadyCondition.Status == api.ConditionUnknown &&
decisionTimestamp.After(nc.nodeStatusMap[node.Name].probeTimestamp.Add(nc.podEvictionTimeout)) {
if nc.evictPods(node.Name) {
glog.V(4).Infof("Evicting pods on node %s: %v is later than %v + %v", node.Name, decisionTimestamp, nc.nodeStatusMap[node.Name].readyTransitionTimestamp, nc.podEvictionTimeout-gracePeriod)
}
}
if observedReadyCondition.Status == api.ConditionTrue {
// We do not treat a master node as a part of the cluster for network segmentation checking.
if !system.IsMasterNode(node) {
seenReady = true
}
if nc.cancelPodEviction(node.Name) {
glog.V(2).Infof("Node %s is ready again, cancelled pod eviction", node.Name)
}
}
// Report node event.
if currentReadyCondition.Status != api.ConditionTrue && observedReadyCondition.Status == api.ConditionTrue {
nc.recordNodeStatusChange(node, "NodeNotReady")
if err = nc.markAllPodsNotReady(node.Name); err != nil {
utilruntime.HandleError(fmt.Errorf("Unable to mark all pods NotReady on node %v: %v", node.Name, err))
}
}
// Check with the cloud provider to see if the node still exists. If it
// doesn't, delete the node immediately.
if currentReadyCondition.Status != api.ConditionTrue && nc.cloud != nil {
exists, err := nc.nodeExistsInCloudProvider(node.Name)
if err != nil {
glog.Errorf("Error determining if node %v exists in cloud: %v", node.Name, err)
continue
}
if !exists {
glog.V(2).Infof("Deleting node (no longer present in cloud provider): %s", node.Name)
nc.recordNodeEvent(node.Name, api.EventTypeNormal, "DeletingNode", fmt.Sprintf("Deleting Node %v because it's not present according to cloud provider", node.Name))
go func(nodeName string) {
defer utilruntime.HandleCrash()
// Kubelet is not reporting and Cloud Provider says node
// is gone. Delete it without worrying about grace
// periods.
if err := nc.forcefullyDeleteNode(nodeName); err != nil {
glog.Errorf("Unable to forcefully delete node %q: %v", nodeName, err)
}
}(node.Name)
continue
}
}
}
}
// NC don't see any Ready Node. We assume that the network is segmented and Nodes cannot connect to API server and
// update their statuses. NC enteres network segmentation mode and cancels all evictions in progress.
if !seenReady {
nc.networkSegmentationMode = true
nc.stopAllPodEvictions()
glog.V(2).Info("NodeController is entering network segmentation mode.")
} else {
if nc.networkSegmentationMode {
nc.forceUpdateAllProbeTimes()
nc.networkSegmentationMode = false
glog.V(2).Info("NodeController exited network segmentation mode.")
}
}
return nil
}
func nodeExistsInCloudProvider(cloud cloudprovider.Interface, nodeName string) (bool, error) {
instances, ok := cloud.Instances()
if !ok {
return false, fmt.Errorf("%v", ErrCloudInstance)
}
if _, err := instances.ExternalID(nodeName); err != nil {
if err == cloudprovider.InstanceNotFound {
return false, nil
}
return false, err
}
return true, nil
}
// forcefullyDeleteNode immediately deletes all pods on the node, and then
// deletes the node itself.
func (nc *NodeController) forcefullyDeleteNode(nodeName string) error {
selector := fields.OneTermEqualSelector(api.PodHostField, nodeName)
options := api.ListOptions{FieldSelector: selector}
pods, err := nc.kubeClient.Core().Pods(api.NamespaceAll).List(options)
if err != nil {
return fmt.Errorf("unable to list pods on node %q: %v", nodeName, err)
}
for _, pod := range pods.Items {
if pod.Spec.NodeName != nodeName {
continue
}
if err := nc.forcefullyDeletePod(&pod); err != nil {
return fmt.Errorf("unable to delete pod %q on node %q: %v", pod.Name, nodeName, err)
}
}
if err := nc.kubeClient.Core().Nodes().Delete(nodeName, nil); err != nil {
return fmt.Errorf("unable to delete node %q: %v", nodeName, err)
}
return nil
}
func (nc *NodeController) recordNodeEvent(nodeName, eventtype, reason, event string) {
ref := &api.ObjectReference{
Kind: "Node",
Name: nodeName,
UID: types.UID(nodeName),
Namespace: "",
}
glog.V(2).Infof("Recording %s event message for node %s", event, nodeName)
nc.recorder.Eventf(ref, eventtype, reason, "Node %s event: %s", nodeName, event)
}
func (nc *NodeController) recordNodeStatusChange(node *api.Node, new_status string) {
ref := &api.ObjectReference{
Kind: "Node",
Name: node.Name,
UID: types.UID(node.Name),
Namespace: "",
}
glog.V(2).Infof("Recording status change %s event message for node %s", new_status, node.Name)
// TODO: This requires a transaction, either both node status is updated
// and event is recorded or neither should happen, see issue #6055.
nc.recorder.Eventf(ref, api.EventTypeNormal, new_status, "Node %s status is now: %s", node.Name, new_status)
}
// For a given node checks its conditions and tries to update it. Returns grace period to which given node
// is entitled, state of current and last observed Ready Condition, and an error if it occurred.
func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, api.NodeCondition, *api.NodeCondition, error) {
var err error
var gracePeriod time.Duration
var observedReadyCondition api.NodeCondition
_, currentReadyCondition := api.GetNodeCondition(&node.Status, api.NodeReady)
if currentReadyCondition == nil {
// If ready condition is nil, then kubelet (or nodecontroller) never posted node status.
// A fake ready condition is created, where LastProbeTime and LastTransitionTime is set
// to node.CreationTimestamp to avoid handle the corner case.
observedReadyCondition = api.NodeCondition{
Type: api.NodeReady,
Status: api.ConditionUnknown,
LastHeartbeatTime: node.CreationTimestamp,
LastTransitionTime: node.CreationTimestamp,
}
gracePeriod = nc.nodeStartupGracePeriod
nc.nodeStatusMap[node.Name] = nodeStatusData{
status: node.Status,
probeTimestamp: node.CreationTimestamp,
readyTransitionTimestamp: node.CreationTimestamp,
}
} else {
// If ready condition is not nil, make a copy of it, since we may modify it in place later.
observedReadyCondition = *currentReadyCondition
gracePeriod = nc.nodeMonitorGracePeriod
}
savedNodeStatus, found := nc.nodeStatusMap[node.Name]
// There are following cases to check:
// - both saved and new status have no Ready Condition set - we leave everything as it is,
// - saved status have no Ready Condition, but current one does - NodeController was restarted with Node data already present in etcd,
// - saved status have some Ready Condition, but current one does not - it's an error, but we fill it up because that's probably a good thing to do,
// - both saved and current statuses have Ready Conditions and they have the same LastProbeTime - nothing happened on that Node, it may be
// unresponsive, so we leave it as it is,
// - both saved and current statuses have Ready Conditions, they have different LastProbeTimes, but the same Ready Condition State -
// everything's in order, no transition occurred, we update only probeTimestamp,
// - both saved and current statuses have Ready Conditions, different LastProbeTimes and different Ready Condition State -
// Ready Condition changed it state since we last seen it, so we update both probeTimestamp and readyTransitionTimestamp.
// TODO: things to consider:
// - if 'LastProbeTime' have gone back in time its probably an error, currently we ignore it,
// - currently only correct Ready State transition outside of Node Controller is marking it ready by Kubelet, we don't check
// if that's the case, but it does not seem necessary.
var savedCondition *api.NodeCondition
if found {
_, savedCondition = api.GetNodeCondition(&savedNodeStatus.status, api.NodeReady)
}
_, observedCondition := api.GetNodeCondition(&node.Status, api.NodeReady)
if !found {
glog.Warningf("Missing timestamp for Node %s. Assuming now as a timestamp.", node.Name)
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: nc.now(),
}
} else if savedCondition == nil && observedCondition != nil {
glog.V(1).Infof("Creating timestamp entry for newly observed Node %s", node.Name)
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: nc.now(),
}
} else if savedCondition != nil && observedCondition == nil {
glog.Errorf("ReadyCondition was removed from Status of Node %s", node.Name)
// TODO: figure out what to do in this case. For now we do the same thing as above.
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: nc.now(),
}
} else if savedCondition != nil && observedCondition != nil && savedCondition.LastHeartbeatTime != observedCondition.LastHeartbeatTime {
var transitionTime unversioned.Time
// If ReadyCondition changed since the last time we checked, we update the transition timestamp to "now",
// otherwise we leave it as it is.
if savedCondition.LastTransitionTime != observedCondition.LastTransitionTime {
glog.V(3).Infof("ReadyCondition for Node %s transitioned from %v to %v", node.Name, savedCondition.Status, observedCondition)
transitionTime = nc.now()
} else {
transitionTime = savedNodeStatus.readyTransitionTimestamp
}
if glog.V(5) {
glog.V(5).Infof("Node %s ReadyCondition updated. Updating timestamp: %+v vs %+v.", node.Name, savedNodeStatus.status, node.Status)
} else {
glog.V(3).Infof("Node %s ReadyCondition updated. Updating timestamp.", node.Name)
}
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: transitionTime,
}
}
nc.nodeStatusMap[node.Name] = savedNodeStatus
if nc.now().After(savedNodeStatus.probeTimestamp.Add(gracePeriod)) {
// NodeReady condition was last set longer ago than gracePeriod, so update it to Unknown
// (regardless of its current value) in the master.
if currentReadyCondition == nil {
glog.V(2).Infof("node %v is never updated by kubelet", node.Name)
node.Status.Conditions = append(node.Status.Conditions, api.NodeCondition{
Type: api.NodeReady,
Status: api.ConditionUnknown,
Reason: "NodeStatusNeverUpdated",
Message: fmt.Sprintf("Kubelet never posted node status."),
LastHeartbeatTime: node.CreationTimestamp,
LastTransitionTime: nc.now(),
})
} else {
glog.V(4).Infof("node %v hasn't been updated for %+v. Last ready condition is: %+v",
node.Name, nc.now().Time.Sub(savedNodeStatus.probeTimestamp.Time), observedReadyCondition)
if observedReadyCondition.Status != api.ConditionUnknown {
currentReadyCondition.Status = api.ConditionUnknown
currentReadyCondition.Reason = "NodeStatusUnknown"
currentReadyCondition.Message = fmt.Sprintf("Kubelet stopped posting node status.")
// LastProbeTime is the last time we heard from kubelet.
currentReadyCondition.LastHeartbeatTime = observedReadyCondition.LastHeartbeatTime
currentReadyCondition.LastTransitionTime = nc.now()
}
}
// Like NodeReady condition, NodeOutOfDisk was last set longer ago than gracePeriod, so update
// it to Unknown (regardless of its current value) in the master.
// TODO(madhusudancs): Refactor this with readyCondition to remove duplicated code.
_, oodCondition := api.GetNodeCondition(&node.Status, api.NodeOutOfDisk)
if oodCondition == nil {
glog.V(2).Infof("Out of disk condition of node %v is never updated by kubelet", node.Name)
node.Status.Conditions = append(node.Status.Conditions, api.NodeCondition{
Type: api.NodeOutOfDisk,
Status: api.ConditionUnknown,
Reason: "NodeStatusNeverUpdated",
Message: fmt.Sprintf("Kubelet never posted node status."),
LastHeartbeatTime: node.CreationTimestamp,
LastTransitionTime: nc.now(),
})
} else {
glog.V(4).Infof("node %v hasn't been updated for %+v. Last out of disk condition is: %+v",
node.Name, nc.now().Time.Sub(savedNodeStatus.probeTimestamp.Time), oodCondition)
if oodCondition.Status != api.ConditionUnknown {
oodCondition.Status = api.ConditionUnknown
oodCondition.Reason = "NodeStatusUnknown"
oodCondition.Message = fmt.Sprintf("Kubelet stopped posting node status.")
oodCondition.LastTransitionTime = nc.now()
}
}
_, currentCondition := api.GetNodeCondition(&node.Status, api.NodeReady)
if !api.Semantic.DeepEqual(currentCondition, &observedReadyCondition) {
if _, err = nc.kubeClient.Core().Nodes().UpdateStatus(node); err != nil {
glog.Errorf("Error updating node %s: %v", node.Name, err)
return gracePeriod, observedReadyCondition, currentReadyCondition, err
} else {
nc.nodeStatusMap[node.Name] = nodeStatusData{
status: node.Status,
probeTimestamp: nc.nodeStatusMap[node.Name].probeTimestamp,
readyTransitionTimestamp: nc.now(),
}
return gracePeriod, observedReadyCondition, currentReadyCondition, nil
}
}
}
return gracePeriod, observedReadyCondition, currentReadyCondition, err
}
// forceUpdateAllProbeTimes bumps all observed timestamps in saved nodeStatuses to now. This makes
// all eviction timer to reset.
func (nc *NodeController) forceUpdateAllProbeTimes() {
now := nc.now()
for k, v := range nc.nodeStatusMap {
v.probeTimestamp = now
v.readyTransitionTimestamp = now
nc.nodeStatusMap[k] = v
}
}
// evictPods queues an eviction for the provided node name, and returns false if the node is already
// queued for eviction.
func (nc *NodeController) evictPods(nodeName string) bool {
if nc.networkSegmentationMode {
return false
}
nc.evictorLock.Lock()
defer nc.evictorLock.Unlock()
return nc.podEvictor.Add(nodeName)
}
// cancelPodEviction removes any queued evictions, typically because the node is available again. It
// returns true if an eviction was queued.
func (nc *NodeController) cancelPodEviction(nodeName string) bool {
nc.evictorLock.Lock()
defer nc.evictorLock.Unlock()
wasDeleting := nc.podEvictor.Remove(nodeName)
wasTerminating := nc.terminationEvictor.Remove(nodeName)
if wasDeleting || wasTerminating {
glog.V(2).Infof("Cancelling pod Eviction on Node: %v", nodeName)
return true
}
return false
}
// stopAllPodEvictions removes any queued evictions for all Nodes.
func (nc *NodeController) stopAllPodEvictions() {
nc.evictorLock.Lock()
defer nc.evictorLock.Unlock()
glog.V(3).Infof("Cancelling all pod evictions.")
nc.podEvictor.Clear()
nc.terminationEvictor.Clear()
}
// deletePods will delete all pods from master running on given node, and return true
// if any pods were deleted.
func (nc *NodeController) deletePods(nodeName string) (bool, error) {
remaining := false
selector := fields.OneTermEqualSelector(api.PodHostField, nodeName)
options := api.ListOptions{FieldSelector: selector}
pods, err := nc.kubeClient.Core().Pods(api.NamespaceAll).List(options)
if err != nil {
return remaining, err
}
if len(pods.Items) > 0 {
nc.recordNodeEvent(nodeName, api.EventTypeNormal, "DeletingAllPods", fmt.Sprintf("Deleting all Pods from Node %v.", nodeName))
}
for _, pod := range pods.Items {
// Defensive check, also needed for tests.
if pod.Spec.NodeName != nodeName {
continue
}
// if the pod has already been deleted, ignore it
if pod.DeletionGracePeriodSeconds != nil {
continue
}
// if the pod is managed by a daemonset, ignore it
_, err := nc.daemonSetStore.GetPodDaemonSets(&pod)
if err == nil { // No error means at least one daemonset was found
continue
}
glog.V(2).Infof("Starting deletion of pod %v", pod.Name)
nc.recorder.Eventf(&pod, api.EventTypeNormal, "NodeControllerEviction", "Marking for deletion Pod %s from Node %s", pod.Name, nodeName)
if err := nc.kubeClient.Core().Pods(pod.Namespace).Delete(pod.Name, nil); err != nil {
return false, err
}
remaining = true
}
return remaining, nil
}
// update ready status of all pods running on given node from master
// return true if success
func (nc *NodeController) markAllPodsNotReady(nodeName string) error {
glog.V(2).Infof("Update ready status of pods on node [%v]", nodeName)
opts := api.ListOptions{FieldSelector: fields.OneTermEqualSelector(api.PodHostField, nodeName)}
pods, err := nc.kubeClient.Core().Pods(api.NamespaceAll).List(opts)
if err != nil {
return err
}
errMsg := []string{}
for _, pod := range pods.Items {
// Defensive check, also needed for tests.
if pod.Spec.NodeName != nodeName {