Merge pull request #49257 from k82cn/k8s_42001

Automatic merge from submit-queue (batch tested with PRs 51574, 51534, 49257, 44680, 48836)

Task 1: Tainted node by condition.

**What this PR does / why we need it**:
Tainted node by condition for MemoryPressure, OutOfDisk and so on.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: part of #42001 

**Release note**:
```release-note
Tainted nodes by conditions as following:
  * 'node.kubernetes.io/network-unavailable=:NoSchedule' if NetworkUnavailable is true
  * 'node.kubernetes.io/disk-pressure=:NoSchedule' if DiskPressure is true
  * 'node.kubernetes.io/memory-pressure=:NoSchedule' if MemoryPressure is true
  * 'node.kubernetes.io/out-of-disk=:NoSchedule' if OutOfDisk is true
```

cmd/kube-controller-manager/app/core.go

@@ -112,6 +112,7 @@ func startNodeController(ctx ControllerContext) (bool, error) {
 		ipam.CIDRAllocatorType(ctx.Options.CIDRAllocatorType),
 		ctx.Options.EnableTaintManager,
 		utilfeature.DefaultFeatureGate.Enabled(features.TaintBasedEvictions),
+		utilfeature.DefaultFeatureGate.Enabled(features.TaintNodesByCondition),
 	)
 	if err != nil {
 		return true, err

pkg/controller/node/BUILD

@@ -21,6 +21,7 @@ go_test(
         "//pkg/kubelet/apis:go_default_library",
         "//pkg/util/node:go_default_library",
         "//pkg/util/taints:go_default_library",
+        "//plugin/pkg/scheduler/algorithm:go_default_library",
         "//vendor/k8s.io/api/core/v1:go_default_library",
         "//vendor/k8s.io/api/extensions/v1beta1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/equality:go_default_library",

pkg/controller/node/node_controller.go

@@ -76,6 +76,20 @@ var (
 		Key:    algorithm.TaintNodeNotReady,
 		Effect: v1.TaintEffectNoExecute,
 	}
+
+	nodeConditionToTaintKeyMap = map[v1.NodeConditionType]string{
+		v1.NodeMemoryPressure:     algorithm.TaintNodeMemoryPressure,
+		v1.NodeOutOfDisk:          algorithm.TaintNodeOutOfDisk,
+		v1.NodeDiskPressure:       algorithm.TaintNodeDiskPressure,
+		v1.NodeNetworkUnavailable: algorithm.TaintNodeNetworkUnavailable,
+	}
+
+	taintKeyToNodeConditionMap = map[string]v1.NodeConditionType{
+		algorithm.TaintNodeNetworkUnavailable: v1.NodeNetworkUnavailable,
+		algorithm.TaintNodeMemoryPressure:     v1.NodeMemoryPressure,
+		algorithm.TaintNodeOutOfDisk:          v1.NodeOutOfDisk,
+		algorithm.TaintNodeDiskPressure:       v1.NodeDiskPressure,
+	}
 )
 
 const (
@@ -180,6 +194,10 @@ type NodeController struct {
 	// if set to true NodeController will taint Nodes with 'TaintNodeNotReady' and 'TaintNodeUnreachable'
 	// taints instead of evicting Pods itself.
 	useTaintBasedEvictions bool
+
+	// if set to true, NodeController will taint Nodes based on its condition for 'NetworkUnavailable',
+	// 'MemoryPressure', 'OutOfDisk' and 'DiskPressure'.
+	taintNodeByCondition bool
 }
 
 // NewNodeController returns a new node controller to sync instances from cloudprovider.
@@ -206,7 +224,9 @@ func NewNodeController(
 	allocateNodeCIDRs bool,
 	allocatorType ipam.CIDRAllocatorType,
 	runTaintManager bool,
-	useTaintBasedEvictions bool) (*NodeController, error) {
+	useTaintBasedEvictions bool,
+	taintNodeByCondition bool,
+) (*NodeController, error) {
 	eventBroadcaster := record.NewBroadcaster()
 	recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "controllermanager"})
 	eventBroadcaster.StartLogging(glog.Infof)
@@ -387,6 +407,17 @@ func NewNodeController(
 		nc.taintManager = scheduler.NewNoExecuteTaintManager(kubeClient)
 	}
 
+	if nc.taintNodeByCondition {
+		nodeInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
+			AddFunc: util.CreateAddNodeHandler(func(node *v1.Node) error {
+				return nc.doNoScheduleTaintingPass(node)
+			}),
+			UpdateFunc: util.CreateUpdateNodeHandler(func(_, newNode *v1.Node) error {
+				return nc.doNoScheduleTaintingPass(newNode)
+			}),
+		})
+	}
+
 	nc.nodeLister = nodeInformer.Lister()
 	nc.nodeInformerSynced = nodeInformer.Informer().HasSynced
 
@@ -425,6 +456,34 @@ func (nc *NodeController) doEvictionPass() {
 	}
 }
 
+func (nc *NodeController) doNoScheduleTaintingPass(node *v1.Node) error {
+	// Map node's condition to Taints.
+	taints := []v1.Taint{}
+	for _, condition := range node.Status.Conditions {
+		if _, found := nodeConditionToTaintKeyMap[condition.Type]; found {
+			if condition.Status == v1.ConditionTrue {
+				taints = append(taints, v1.Taint{
+					Key:    nodeConditionToTaintKeyMap[condition.Type],
+					Effect: v1.TaintEffectNoSchedule,
+				})
+			}
+		}
+	}
+	nodeTaints := taintutils.TaintSetFilter(node.Spec.Taints, func(t *v1.Taint) bool {
+		_, found := taintKeyToNodeConditionMap[t.Key]
+		return found
+	})
+	taintsToAdd, taintsToDel := taintutils.TaintSetDiff(taints, nodeTaints)
+	// If nothing to add not delete, return true directly.
+	if len(taintsToAdd) == 0 && len(taintsToDel) == 0 {
+		return nil
+	}
+	if !util.SwapNodeControllerTaint(nc.kubeClient, taintsToAdd, taintsToDel, node) {
+		return fmt.Errorf("failed to swap taints of node %+v", node)
+	}
+	return nil
+}
+
 func (nc *NodeController) doNoExecuteTaintingPass() {
 	nc.evictorLock.Lock()
 	defer nc.evictorLock.Unlock()
@@ -459,7 +518,7 @@ func (nc *NodeController) doNoExecuteTaintingPass() {
 				return true, 0
 			}
 
-			return util.SwapNodeControllerTaint(nc.kubeClient, &taintToAdd, &oppositeTaint, node), 0
+			return util.SwapNodeControllerTaint(nc.kubeClient, []*v1.Taint{&taintToAdd}, []*v1.Taint{&oppositeTaint}, node), 0
 		})
 	}
 }
@@ -542,7 +601,7 @@ func (nc *NodeController) monitorNodeStatus() error {
 		nc.knownNodeSet[added[i].Name] = added[i]
 		nc.addPodEvictorForNewZone(added[i])
 		if nc.useTaintBasedEvictions {
-			nc.markNodeAsHealthy(added[i])
+			nc.markNodeAsReachable(added[i])
 		} else {
 			nc.cancelPodEviction(added[i])
 		}
@@ -591,7 +650,7 @@ func (nc *NodeController) monitorNodeStatus() error {
 					// We want to update the taint straight away if Node is already tainted with the UnreachableTaint
 					if taintutils.TaintExists(node.Spec.Taints, UnreachableTaintTemplate) {
 						taintToAdd := *NotReadyTaintTemplate
-						if !util.SwapNodeControllerTaint(nc.kubeClient, &taintToAdd, UnreachableTaintTemplate, node) {
+						if !util.SwapNodeControllerTaint(nc.kubeClient, []*v1.Taint{&taintToAdd}, []*v1.Taint{UnreachableTaintTemplate}, node) {
 							glog.Errorf("Failed to instantly swap UnreachableTaint to NotReadyTaint. Will try again in the next cycle.")
 						}
 					} else if nc.markNodeForTainting(node) {
@@ -618,7 +677,7 @@ func (nc *NodeController) monitorNodeStatus() error {
 					// We want to update the taint straight away if Node is already tainted with the UnreachableTaint
 					if taintutils.TaintExists(node.Spec.Taints, NotReadyTaintTemplate) {
 						taintToAdd := *UnreachableTaintTemplate
-						if !util.SwapNodeControllerTaint(nc.kubeClient, &taintToAdd, NotReadyTaintTemplate, node) {
+						if !util.SwapNodeControllerTaint(nc.kubeClient, []*v1.Taint{&taintToAdd}, []*v1.Taint{NotReadyTaintTemplate}, node) {
 							glog.Errorf("Failed to instantly swap UnreachableTaint to NotReadyTaint. Will try again in the next cycle.")
 						}
 					} else if nc.markNodeForTainting(node) {
@@ -642,7 +701,7 @@ func (nc *NodeController) monitorNodeStatus() error {
 			}
 			if observedReadyCondition.Status == v1.ConditionTrue {
 				if nc.useTaintBasedEvictions {
-					removed, err := nc.markNodeAsHealthy(node)
+					removed, err := nc.markNodeAsReachable(node)
 					if err != nil {
 						glog.Errorf("Failed to remove taints from node %v. Will retry in next iteration.", node.Name)
 					}
@@ -737,7 +796,7 @@ func (nc *NodeController) handleDisruption(zoneToNodeConditions map[string][]*v1
 			glog.V(0).Info("NodeController detected that all Nodes are not-Ready. Entering master disruption mode.")
 			for i := range nodes {
 				if nc.useTaintBasedEvictions {
-					_, err := nc.markNodeAsHealthy(nodes[i])
+					_, err := nc.markNodeAsReachable(nodes[i])
 					if err != nil {
 						glog.Errorf("Failed to remove taints from Node %v", nodes[i].Name)
 					}
@@ -1053,7 +1112,7 @@ func (nc *NodeController) markNodeForTainting(node *v1.Node) bool {
 	return nc.zoneNoExecuteTainer[utilnode.GetZoneKey(node)].Add(node.Name, string(node.UID))
 }
 
-func (nc *NodeController) markNodeAsHealthy(node *v1.Node) (bool, error) {
+func (nc *NodeController) markNodeAsReachable(node *v1.Node) (bool, error) {
 	nc.evictorLock.Lock()
 	defer nc.evictorLock.Unlock()
 	err := controller.RemoveTaintOffNode(nc.kubeClient, node.Name, node, UnreachableTaintTemplate)

pkg/controller/node/nodecontroller_test.go

@@ -46,6 +46,7 @@ import (
 	kubeletapis "k8s.io/kubernetes/pkg/kubelet/apis"
 	"k8s.io/kubernetes/pkg/util/node"
 	taintutils "k8s.io/kubernetes/pkg/util/taints"
+	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
 )
 
 const (
@@ -109,6 +110,7 @@ func NewNodeControllerFromClient(
 		ipam.RangeAllocatorType,
 		useTaints,
 		useTaints,
+		useTaints,
 	)
 	if err != nil {
 		return nil, err
@@ -2060,6 +2062,186 @@ func TestSwapUnreachableNotReadyTaints(t *testing.T) {
 	}
 }
 
+func TestTaintsNodeByCondition(t *testing.T) {
+	fakeNow := metav1.Date(2017, 1, 1, 12, 0, 0, 0, time.UTC)
+	evictionTimeout := 10 * time.Minute
+
+	fakeNodeHandler := &testutil.FakeNodeHandler{
+		Existing: []*v1.Node{
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "node0",
+					CreationTimestamp: metav1.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+					Labels: map[string]string{
+						kubeletapis.LabelZoneRegion:        "region1",
+						kubeletapis.LabelZoneFailureDomain: "zone1",
+					},
+				},
+				Status: v1.NodeStatus{
+					Conditions: []v1.NodeCondition{
+						{
+							Type:               v1.NodeReady,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+					},
+				},
+			},
+		},
+		Clientset: fake.NewSimpleClientset(&v1.PodList{Items: []v1.Pod{*testutil.NewPod("pod0", "node0")}}),
+	}
+
+	nodeController, _ := NewNodeControllerFromClient(nil, fakeNodeHandler, evictionTimeout,
+		testRateLimiterQPS, testRateLimiterQPS, testLargeClusterThreshold, testUnhealthyThreshold, testNodeMonitorGracePeriod,
+		testNodeStartupGracePeriod, testNodeMonitorPeriod, nil, nil, 0, false, true)
+	nodeController.now = func() metav1.Time { return fakeNow }
+	nodeController.recorder = testutil.NewFakeRecorder()
+
+	outOfDiskTaint := &v1.Taint{
+		Key:    algorithm.TaintNodeOutOfDisk,
+		Effect: v1.TaintEffectNoSchedule,
+	}
+	networkUnavailableTaint := &v1.Taint{
+		Key:    algorithm.TaintNodeNetworkUnavailable,
+		Effect: v1.TaintEffectNoSchedule,
+	}
+
+	tests := []struct {
+		Name           string
+		Node           *v1.Node
+		ExpectedTaints []*v1.Taint
+	}{
+		{
+			Name: "NetworkUnavailable is true",
+			Node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "node0",
+					CreationTimestamp: metav1.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+					Labels: map[string]string{
+						kubeletapis.LabelZoneRegion:        "region1",
+						kubeletapis.LabelZoneFailureDomain: "zone1",
+					},
+				},
+				Status: v1.NodeStatus{
+					Conditions: []v1.NodeCondition{
+						{
+							Type:               v1.NodeReady,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+						{
+							Type:               v1.NodeNetworkUnavailable,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+					},
+				},
+			},
+			ExpectedTaints: []*v1.Taint{networkUnavailableTaint},
+		},
+		{
+			Name: "NetworkUnavailable and OutOfDisk are true",
+			Node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "node0",
+					CreationTimestamp: metav1.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+					Labels: map[string]string{
+						kubeletapis.LabelZoneRegion:        "region1",
+						kubeletapis.LabelZoneFailureDomain: "zone1",
+					},
+				},
+				Status: v1.NodeStatus{
+					Conditions: []v1.NodeCondition{
+						{
+							Type:               v1.NodeReady,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+						{
+							Type:               v1.NodeNetworkUnavailable,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+						{
+							Type:               v1.NodeOutOfDisk,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+					},
+				},
+			},
+			ExpectedTaints: []*v1.Taint{networkUnavailableTaint, outOfDiskTaint},
+		},
+		{
+			Name: "NetworkUnavailable is true, OutOfDisk is unknown",
+			Node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "node0",
+					CreationTimestamp: metav1.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+					Labels: map[string]string{
+						kubeletapis.LabelZoneRegion:        "region1",
+						kubeletapis.LabelZoneFailureDomain: "zone1",
+					},
+				},
+				Status: v1.NodeStatus{
+					Conditions: []v1.NodeCondition{
+						{
+							Type:               v1.NodeReady,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+						{
+							Type:               v1.NodeNetworkUnavailable,
+							Status:             v1.ConditionTrue,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+						{
+							Type:               v1.NodeOutOfDisk,
+							Status:             v1.ConditionUnknown,
+							LastHeartbeatTime:  metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+							LastTransitionTime: metav1.Date(2015, 1, 1, 12, 0, 0, 0, time.UTC),
+						},
+					},
+				},
+			},
+			ExpectedTaints: []*v1.Taint{networkUnavailableTaint},
+		},
+	}
+
+	for _, test := range tests {
+		fakeNodeHandler.Update(test.Node)
+		if err := syncNodeStore(nodeController, fakeNodeHandler); err != nil {
+			t.Errorf("unexpected error: %v", err)
+		}
+		nodeController.doNoScheduleTaintingPass(test.Node)
+		if err := syncNodeStore(nodeController, fakeNodeHandler); err != nil {
+			t.Errorf("unexpected error: %v", err)
+		}
+		node0, err := nodeController.nodeLister.Get("node0")
+		if err != nil {
+			t.Errorf("Can't get current node0...")
+			return
+		}
+		if len(node0.Spec.Taints) != len(test.ExpectedTaints) {
+			t.Errorf("%s: Unexpected number of taints: expected %d, got %d",
+				test.Name, len(test.ExpectedTaints), len(node0.Spec.Taints))
+		}
+		for _, taint := range test.ExpectedTaints {
+			if !taintutils.TaintExists(node0.Spec.Taints, taint) {
+				t.Errorf("%s: Can't find taint %v in %v", test.Name, taint, node0.Spec.Taints)
+			}
+		}
+	}
+}
+
 func TestNodeEventGeneration(t *testing.T) {
 	fakeNow := metav1.Date(2016, 9, 10, 12, 0, 0, 0, time.UTC)
 	fakeNodeHandler := &testutil.FakeNodeHandler{

pkg/controller/node/util/controller_utils.go

@@ -254,31 +254,35 @@ func RecordNodeStatusChange(recorder record.EventRecorder, node *v1.Node, newSta
 
 // SwapNodeControllerTaint returns true in case of success and false
 // otherwise.
-func SwapNodeControllerTaint(kubeClient clientset.Interface, taintToAdd, taintToRemove *v1.Taint, node *v1.Node) bool {
+func SwapNodeControllerTaint(kubeClient clientset.Interface, taintsToAdd, taintsToRemove []*v1.Taint, node *v1.Node) bool {
+	for _, taintToAdd := range taintsToAdd {
 		taintToAdd.TimeAdded = metav1.Now()
-	err := controller.AddOrUpdateTaintOnNode(kubeClient, node.Name, taintToAdd)
-	if err != nil {
-		utilruntime.HandleError(
-			fmt.Errorf(
-				"unable to taint %v unresponsive Node %q: %v",
-				taintToAdd.Key,
-				node.Name,
-				err))
-		return false
 	}
-	glog.V(4).Infof("Added %v Taint to Node %v", taintToAdd, node.Name)
 
-	err = controller.RemoveTaintOffNode(kubeClient, node.Name, node, taintToRemove)
+	err := controller.AddOrUpdateTaintOnNode(kubeClient, node.Name, taintsToAdd...)
 	if err != nil {
 		utilruntime.HandleError(
 			fmt.Errorf(
-				"unable to remove %v unneeded taint from unresponsive Node %q: %v",
-				taintToRemove.Key,
+				"unable to taint %+v unresponsive Node %q: %v",
+				taintsToAdd,
 				node.Name,
 				err))
 		return false
 	}
-	glog.V(4).Infof("Made sure that Node %v has no %v Taint", node.Name, taintToRemove)
+	glog.V(4).Infof("Added %+v Taint to Node %v", taintsToAdd, node.Name)
+
+	err = controller.RemoveTaintOffNode(kubeClient, node.Name, node, taintsToRemove...)
+	if err != nil {
+		utilruntime.HandleError(
+			fmt.Errorf(
+				"unable to remove %+v unneeded taint from unresponsive Node %q: %v",
+				taintsToRemove,
+				node.Name,
+				err))
+		return false
+	}
+	glog.V(4).Infof("Made sure that Node %+v has no %v Taint", node.Name, taintsToRemove)
+
 	return true
 }
 

pkg/util/taints/taints.go

@@ -19,11 +19,11 @@ package taints
 
 import (
 	"fmt"
-	"k8s.io/apimachinery/pkg/util/sets"
 	"strings"
 
 	"k8s.io/api/core/v1"
 	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/validation"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/helper"
@@ -299,3 +299,33 @@ func TaintExists(taints []v1.Taint, taintToFind *v1.Taint) bool {
 	}
 	return false
 }
+
+func TaintSetDiff(t1, t2 []v1.Taint) (taintsToAdd []*v1.Taint, taintsToRemove []*v1.Taint) {
+	for _, taint := range t1 {
+		if !TaintExists(t2, &taint) {
+			t := taint
+			taintsToAdd = append(taintsToAdd, &t)
+		}
+	}
+
+	for _, taint := range t2 {
+		if !TaintExists(t1, &taint) {
+			t := taint
+			taintsToRemove = append(taintsToRemove, &t)
+		}
+	}
+
+	return
+}
+
+func TaintSetFilter(taints []v1.Taint, fn func(*v1.Taint) bool) []v1.Taint {
+	res := []v1.Taint{}
+
+	for _, taint := range taints {
+		if fn(&taint) {
+			res = append(res, taint)
+		}
+	}
+
+	return res
+}