Node controller supports disabling node probes.

Node controller supports disabling sending node probes and updating node statuses. Controlled by --sync_node_status flag. Resolves #4565.

cmd/integration/integration.go

@@ -206,7 +206,7 @@ func startComponents(manifestURL string) (apiServerURL string) {
 	nodeResources := &api.NodeResources{}
 
 	nodeController := nodeControllerPkg.NewNodeController(nil, "", machineList, nodeResources, cl, fakeKubeletClient{}, 10, 5*time.Minute)
-	nodeController.Run(5*time.Second, true)
+	nodeController.Run(5*time.Second, true, true)
 
 	// Kubelet (localhost)
 	testRootDir := makeTempDirOrDie("kubelet_integ_1.")

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

@@ -54,6 +54,7 @@ type CMServer struct {
 	RegisterRetryCount      int
 	MachineList             util.StringList
 	SyncNodeList            bool
+	SyncNodeStatus          bool
 	PodEvictionTimeout      time.Duration
 
 	// TODO: Discover these by pinging the host machines, and rip out these params.
@@ -75,6 +76,7 @@ func NewCMServer() *CMServer {
 		NodeMilliCPU:            1000,
 		NodeMemory:              resource.MustParse("3Gi"),
 		SyncNodeList:            true,
+		SyncNodeStatus:          true,
 		KubeletConfig: client.KubeletConfig{
 			Port:        ports.KubeletPort,
 			EnableHttps: false,
@@ -100,6 +102,7 @@ func (s *CMServer) AddFlags(fs *pflag.FlagSet) {
 		"The number of retries for initial node registration.  Retry interval equals node_sync_period.")
 	fs.Var(&s.MachineList, "machines", "List of machines to schedule onto, comma separated.")
 	fs.BoolVar(&s.SyncNodeList, "sync_nodes", s.SyncNodeList, "If true, and --cloud_provider is specified, sync nodes from the cloud provider. Default true.")
+	fs.BoolVar(&s.SyncNodeStatus, "sync_node_status", s.SyncNodeStatus, "Should node controler send probes to kubelets and update NodeStatus.")
 	// TODO: Discover these by pinging the host machines, and rip out these flags.
 	// TODO: in the meantime, use resource.QuantityFlag() instead of these
 	fs.Int64Var(&s.NodeMilliCPU, "node_milli_cpu", s.NodeMilliCPU, "The amount of MilliCPU provisioned on each node")
@@ -158,7 +161,7 @@ func (s *CMServer) Run(_ []string) error {
 
 	nodeController := nodeControllerPkg.NewNodeController(cloud, s.MinionRegexp, s.MachineList, nodeResources,
 		kubeClient, kubeletClient, s.RegisterRetryCount, s.PodEvictionTimeout)
-	nodeController.Run(s.NodeSyncPeriod, s.SyncNodeList)
+	nodeController.Run(s.NodeSyncPeriod, s.SyncNodeList, s.SyncNodeStatus)
 
 	resourceQuotaManager := resourcequota.NewResourceQuotaManager(kubeClient)
 	resourceQuotaManager.Run(s.ResourceQuotaSyncPeriod)

cmd/kubernetes/kubernetes.go

@@ -127,7 +127,7 @@ func runControllerManager(machineList []string, cl *client.Client, nodeMilliCPU,
 	kubeClient := &client.HTTPKubeletClient{Client: http.DefaultClient, Port: ports.KubeletPort}
 
 	nodeController := nodeControllerPkg.NewNodeController(nil, "", machineList, nodeResources, cl, kubeClient, 10, 5*time.Minute)
-	nodeController.Run(10*time.Second, true)
+	nodeController.Run(10*time.Second, true, true)
 
 	endpoints := service.NewEndpointController(cl)
 	go util.Forever(func() { endpoints.SyncServiceEndpoints() }, time.Second*10)

pkg/cloudprovider/controller/nodecontroller.go

@@ -77,7 +77,7 @@ func NewNodeController(
 
 // Run creates initial node list and start syncing instances from cloudprovider if any.
 // It also starts syncing cluster node status.
-func (s *NodeController) Run(period time.Duration, syncNodeList bool) {
+func (s *NodeController) Run(period time.Duration, syncNodeList, syncNodeStatus bool) {
 	// Register intial set of nodes with their status set.
 	var nodes *api.NodeList
 	var err error
@@ -96,7 +96,6 @@ func (s *NodeController) Run(period time.Duration, syncNodeList bool) {
 			glog.Errorf("Error loading initial static nodes: %v", err)
 		}
 	}
-	nodes = s.DoChecks(nodes)
 	nodes, err = s.PopulateIPs(nodes)
 	if err != nil {
 		glog.Errorf("Error getting nodes ips: %v", err)
@@ -114,12 +113,21 @@ func (s *NodeController) Run(period time.Duration, syncNodeList bool) {
 		}, period)
 	}
 
-	// Start syncing node status.
-	go util.Forever(func() {
-		if err = s.SyncNodeStatus(); err != nil {
-			glog.Errorf("Error syncing status: %v", err)
-		}
-	}, period)
+	if syncNodeStatus {
+		// Start syncing node status.
+		go util.Forever(func() {
+			if err = s.SyncNodeStatus(); err != nil {
+				glog.Errorf("Error syncing status: %v", err)
+			}
+		}, period)
+	} else {
+		// Start checking node reachability and evicting timeouted pods.
+		go util.Forever(func() {
+			if err = s.EvictTimeoutedPods(); err != nil {
+				glog.Errorf("Error evicting timeouted pods: %v", err)
+			}
+		}, period)
+	}
 }
 
 // RegisterNodes registers the given list of nodes, it keeps retrying for `retryCount` times.
@@ -216,6 +224,33 @@ func (s *NodeController) SyncNodeStatus() error {
 	return nil
 }
 
+// EvictTimeoutedPods verifies if nodes are reachable by checking the time of last probe
+// and deletes pods from not reachable nodes.
+func (s *NodeController) EvictTimeoutedPods() error {
+	nodes, err := s.kubeClient.Nodes().List()
+	if err != nil {
+		return err
+	}
+	for _, node := range nodes.Items {
+		if util.Now().After(latestReadyTime(&node).Add(s.podEvictionTimeout)) {
+			s.deletePods(node.Name)
+		}
+	}
+	return nil
+}
+
+func latestReadyTime(node *api.Node) util.Time {
+	readyTime := node.ObjectMeta.CreationTimestamp
+	for _, condition := range node.Status.Conditions {
+		if condition.Type == api.NodeReady &&
+			condition.Status == api.ConditionFull &&
+			condition.LastProbeTime.After(readyTime.Time) {
+			readyTime = condition.LastProbeTime
+		}
+	}
+	return readyTime
+}
+
 // PopulateIPs queries IPs for given list of nodes.
 func (s *NodeController) PopulateIPs(nodes *api.NodeList) (*api.NodeList, error) {
 	if s.isRunningCloudProvider() {

pkg/cloudprovider/controller/nodecontroller_test.go

@@ -709,6 +709,118 @@ func TestSyncNodeStatusTransitionTime(t *testing.T) {
 	}
 }
 
+func TestEvictTimeoutedPods(t *testing.T) {
+	table := []struct {
+		fakeNodeHandler      *FakeNodeHandler
+		expectedRequestCount int
+		expectedActions      []client.FakeAction
+	}{
+		// Node created long time ago, with no status.
+		{
+			fakeNodeHandler: &FakeNodeHandler{
+				Existing: []*api.Node{
+					{
+						ObjectMeta: api.ObjectMeta{
+							Name:              "node0",
+							CreationTimestamp: util.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+						},
+					},
+				},
+				Fake: client.Fake{
+					PodsList: api.PodList{Items: []api.Pod{*newPod("pod0", "node0")}},
+				},
+			},
+			expectedRequestCount: 1, // List
+			expectedActions:      []client.FakeAction{{Action: "list-pods"}, {Action: "delete-pod", Value: "pod0"}},
+		},
+		// Node created recently, with no status.
+		{
+			fakeNodeHandler: &FakeNodeHandler{
+				Existing: []*api.Node{
+					{
+						ObjectMeta: api.ObjectMeta{
+							Name:              "node0",
+							CreationTimestamp: util.Now(),
+						},
+					},
+				},
+				Fake: client.Fake{
+					PodsList: api.PodList{Items: []api.Pod{*newPod("pod0", "node0")}},
+				},
+			},
+			expectedRequestCount: 1, // List
+			expectedActions:      nil,
+		},
+		// Node created long time ago, with status updated long time ago.
+		{
+			fakeNodeHandler: &FakeNodeHandler{
+				Existing: []*api.Node{
+					{
+						ObjectMeta: api.ObjectMeta{
+							Name:              "node0",
+							CreationTimestamp: util.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+						},
+						Status: api.NodeStatus{
+							Conditions: []api.NodeCondition{
+								{
+									Type:          api.NodeReady,
+									Status:        api.ConditionFull,
+									LastProbeTime: util.Date(2013, 1, 1, 0, 0, 0, 0, time.UTC),
+								},
+							},
+						},
+					},
+				},
+				Fake: client.Fake{
+					PodsList: api.PodList{Items: []api.Pod{*newPod("pod0", "node0")}},
+				},
+			},
+			expectedRequestCount: 1, // List
+			expectedActions:      []client.FakeAction{{Action: "list-pods"}, {Action: "delete-pod", Value: "pod0"}},
+		},
+		// Node created long time ago, with status updated recently.
+		{
+			fakeNodeHandler: &FakeNodeHandler{
+				Existing: []*api.Node{
+					{
+						ObjectMeta: api.ObjectMeta{
+							Name:              "node0",
+							CreationTimestamp: util.Date(2012, 1, 1, 0, 0, 0, 0, time.UTC),
+						},
+						Status: api.NodeStatus{
+							Conditions: []api.NodeCondition{
+								{
+									Type:          api.NodeReady,
+									Status:        api.ConditionFull,
+									LastProbeTime: util.Now(),
+								},
+							},
+						},
+					},
+				},
+				Fake: client.Fake{
+					PodsList: api.PodList{Items: []api.Pod{*newPod("pod0", "node0")}},
+				},
+			},
+			expectedRequestCount: 1, // List
+			expectedActions:      nil,
+		},
+	}
+
+	for _, item := range table {
+		nodeController := NewNodeController(nil, "", []string{"node0"}, nil, item.fakeNodeHandler, nil, 10, 5*time.Minute)
+		if err := nodeController.EvictTimeoutedPods(); err != nil {
+			t.Errorf("unexpected error: %v", err)
+		}
+		if item.expectedRequestCount != item.fakeNodeHandler.RequestCount {
+			t.Errorf("expected %v call, but got %v.", item.expectedRequestCount, item.fakeNodeHandler.RequestCount)
+		}
+		if !reflect.DeepEqual(item.expectedActions, item.fakeNodeHandler.Actions) {
+			t.Errorf("actions differs, expected %+v, got %+v", item.expectedActions, item.fakeNodeHandler.Actions)
+		}
+	}
+}
+
 func TestSyncNodeStatusDeletePods(t *testing.T) {
 	table := []struct {
 		fakeNodeHandler      *FakeNodeHandler