Add InstanceExists* methods to cloud provider interface for CCM

pkg/cloudprovider/cloud.go

@@ -124,7 +124,7 @@ type Instances interface {
 	// ProviderID is a unique identifier of the node. This will not be called
 	// from the node whose nodeaddresses are being queried. i.e. local metadata
 	// services cannot be used in this method to obtain nodeaddresses
-	NodeAddressesByProviderID(providerId string) ([]v1.NodeAddress, error)
+	NodeAddressesByProviderID(providerID string) ([]v1.NodeAddress, error)
 	// ExternalID returns the cloud provider ID of the node with the specified NodeName.
 	// Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
 	ExternalID(nodeName types.NodeName) (string, error)
@@ -140,6 +140,9 @@ type Instances interface {
 	// CurrentNodeName returns the name of the node we are currently running on
 	// On most clouds (e.g. GCE) this is the hostname, so we provide the hostname
 	CurrentNodeName(hostname string) (types.NodeName, error)
+	// InstanceExistsByProviderID returns true if the instance for the given provider id still is running.
+	// If false is returned with no error, the instance will be immediately deleted.
+	InstanceExistsByProviderID(providerID string) (bool, error)
 }
 
 // Route is a representation of an advanced routing rule.

pkg/cloudprovider/providers/aws/aws.go

@@ -1101,6 +1101,11 @@ func (c *Cloud) ExternalID(nodeName types.NodeName) (string, error) {
 	return orEmpty(instance.InstanceId), nil
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (c *Cloud) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the cloud provider ID of the node with the specified nodeName.
 func (c *Cloud) InstanceID(nodeName types.NodeName) (string, error) {
 	// In the future it is possible to also return an endpoint as:

pkg/cloudprovider/providers/azure/azure_instances.go

@@ -17,6 +17,7 @@ limitations under the License.
 package azure
 
 import (
+	"errors"
 	"fmt"
 
 	"k8s.io/api/core/v1"
@@ -86,6 +87,11 @@ func (az *Cloud) ExternalID(name types.NodeName) (string, error) {
 	return az.InstanceID(name)
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (az *Cloud) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 func (az *Cloud) isCurrentInstance(name types.NodeName) (bool, error) {
 	nodeName := mapNodeNameToVMName(name)
 	metadataName, err := az.metadata.Text("instance/compute/name")

pkg/cloudprovider/providers/fake/fake.go

@@ -47,8 +47,12 @@ type FakeUpdateBalancerCall struct {
 
 // FakeCloud is a test-double implementation of Interface, LoadBalancer, Instances, and Routes. It is useful for testing.
 type FakeCloud struct {
-	Exists        bool
-	Err           error
+	Exists bool
+	Err    error
+
+	ExistsByProviderID bool
+	ErrByProviderID    error
+
 	Calls         []string
 	Addresses     []v1.NodeAddress
 	ExtID         map[types.NodeName]string
@@ -234,6 +238,12 @@ func (f *FakeCloud) InstanceTypeByProviderID(providerID string) (string, error)
 	return f.InstanceTypes[types.NodeName(providerID)], nil
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (f *FakeCloud) InstanceExistsByProviderID(providerID string) (bool, error) {
+	f.addCall("instance-exists-by-provider-id")
+	return f.ExistsByProviderID, f.ErrByProviderID
+}
+
 // List is a test-spy implementation of Instances.List.
 // It adds an entry "list" into the internal method call record.
 func (f *FakeCloud) List(filter string) ([]types.NodeName, error) {

pkg/cloudprovider/providers/gce/gce_instances.go

@@ -17,6 +17,7 @@ limitations under the License.
 package gce
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"strconv"
@@ -151,6 +152,11 @@ func (gce *GCECloud) ExternalID(nodeName types.NodeName) (string, error) {
 	return strconv.FormatUint(inst.ID, 10), nil
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (gce *GCECloud) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the cloud provider ID of the node with the specified NodeName.
 func (gce *GCECloud) InstanceID(nodeName types.NodeName) (string, error) {
 	instanceName := mapNodeNameToInstanceName(nodeName)

pkg/cloudprovider/providers/openstack/openstack_instances.go

@@ -110,6 +110,11 @@ func (i *Instances) ExternalID(name types.NodeName) (string, error) {
 	return srv.ID, nil
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (i *Instances) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the kubelet's cloud provider ID.
 func (os *OpenStack) InstanceID() (string, error) {
 	if len(os.localInstanceID) == 0 {

pkg/cloudprovider/providers/ovirt/ovirt.go

@@ -211,6 +211,11 @@ func (v *OVirtCloud) ExternalID(nodeName types.NodeName) (string, error) {
 	return instance.UUID, nil
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (v *OVirtCloud) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the cloud provider ID of the node with the specified NodeName.
 func (v *OVirtCloud) InstanceID(nodeName types.NodeName) (string, error) {
 	name := mapNodeNameToInstanceName(nodeName)

pkg/cloudprovider/providers/photon/photon.go

@@ -470,6 +470,11 @@ func (pc *PCCloud) ExternalID(nodeName k8stypes.NodeName) (string, error) {
 	}
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (pc *PCCloud) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the cloud provider ID of the specified instance.
 func (pc *PCCloud) InstanceID(nodeName k8stypes.NodeName) (string, error) {
 	name := string(nodeName)

pkg/cloudprovider/providers/rackspace/rackspace.go

@@ -436,6 +436,11 @@ func (i *Instances) ExternalID(nodeName types.NodeName) (string, error) {
 	return probeInstanceID(i.compute, serverName)
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (i *Instances) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the cloud provider ID of the kubelet's instance.
 func (rs *Rackspace) InstanceID() (string, error) {
 	return readInstanceID()

pkg/cloudprovider/providers/vsphere/vsphere.go

@@ -376,6 +376,11 @@ func (vs *VSphere) ExternalID(nodeName k8stypes.NodeName) (string, error) {
 	return vs.InstanceID(nodeName)
 }
 
+// InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
+func (vs *VSphere) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 // InstanceID returns the cloud provider ID of the node with the specified Name.
 func (vs *VSphere) InstanceID(nodeName k8stypes.NodeName) (string, error) {
 	if vs.localInstanceID == nodeNameToVMName(nodeName) {

pkg/controller/cloud/node_controller.go

@@ -237,26 +237,36 @@ func (cnc *CloudNodeController) MonitorNode() {
 			if currentReadyCondition.Status != v1.ConditionTrue {
 				// Check with the cloud provider to see if the node still exists. If it
 				// doesn't, delete the node immediately.
-				if _, err := instances.ExternalID(types.NodeName(node.Name)); err != nil {
-					if err == cloudprovider.InstanceNotFound {
-						glog.V(2).Infof("Deleting node no longer present in cloud provider: %s", node.Name)
-						ref := &v1.ObjectReference{
-							Kind:      "Node",
-							Name:      node.Name,
-							UID:       types.UID(node.UID),
-							Namespace: "",
-						}
-						glog.V(2).Infof("Recording %s event message for node %s", "DeletingNode", node.Name)
-						cnc.recorder.Eventf(ref, v1.EventTypeNormal, fmt.Sprintf("Deleting Node %v because it's not present according to cloud provider", node.Name), "Node %s event: %s", node.Name, "DeletingNode")
-						go func(nodeName string) {
-							defer utilruntime.HandleCrash()
-							if err := cnc.kubeClient.CoreV1().Nodes().Delete(node.Name, nil); err != nil {
-								glog.Errorf("unable to delete node %q: %v", node.Name, err)
-							}
-						}(node.Name)
-					}
-					glog.Errorf("Error getting node data from cloud: %v", err)
+				exists, err := ensureNodeExistsByProviderIDOrName(instances, node)
+				if err != nil {
+					glog.Errorf("Error getting data for node %s from cloud: %v", node.Name, err)
+					continue
+				}
+
+				if exists {
+					// Continue checking the remaining nodes since the current one is fine.
+					continue
+				}
+
+				glog.V(2).Infof("Deleting node since it is no longer present in cloud provider: %s", node.Name)
+
+				ref := &v1.ObjectReference{
+					Kind:      "Node",
+					Name:      node.Name,
+					UID:       types.UID(node.UID),
+					Namespace: "",
 				}
+				glog.V(2).Infof("Recording %s event message for node %s", "DeletingNode", node.Name)
+
+				cnc.recorder.Eventf(ref, v1.EventTypeNormal, fmt.Sprintf("Deleting Node %v because it's not present according to cloud provider", node.Name), "Node %s event: %s", node.Name, "DeletingNode")
+
+				go func(nodeName string) {
+					defer utilruntime.HandleCrash()
+					if err := cnc.kubeClient.CoreV1().Nodes().Delete(nodeName, nil); err != nil {
+						glog.Errorf("unable to delete node %q: %v", nodeName, err)
+					}
+				}(node.Name)
+
 			}
 		}
 	}
@@ -372,6 +382,25 @@ func excludeTaintFromList(taints []v1.Taint, toExclude v1.Taint) []v1.Taint {
 	return newTaints
 }
 
+// ensureNodeExistsByProviderIDOrName first checks if the instance exists by the provider id and then by node name
+func ensureNodeExistsByProviderIDOrName(instances cloudprovider.Instances, node *v1.Node) (bool, error) {
+	exists, err := instances.InstanceExistsByProviderID(node.Spec.ProviderID)
+	if err != nil {
+		providerIDErr := err
+		_, err = instances.ExternalID(types.NodeName(node.Name))
+		if err == nil {
+			return true, nil
+		}
+		if err == cloudprovider.InstanceNotFound {
+			return false, nil
+		}
+
+		return false, fmt.Errorf("InstanceExistsByProviderID: Error fetching by providerID: %v Error fetching by NodeName: %v", providerIDErr, err)
+	}
+
+	return exists, nil
+}
+
 func getNodeAddressesByProviderIDOrName(instances cloudprovider.Instances, node *v1.Node) ([]v1.NodeAddress, error) {
 	nodeAddresses, err := instances.NodeAddressesByProviderID(node.Spec.ProviderID)
 	if err != nil {

pkg/controller/cloud/node_controller_test.go

@@ -17,6 +17,8 @@ limitations under the License.
 package cloud
 
 import (
+	"errors"
+	"reflect"
 	"testing"
 	"time"
 
@@ -39,6 +41,119 @@ import (
 	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
 )
 
+func TestEnsureNodeExistsByProviderIDOrNodeName(t *testing.T) {
+
+	testCases := []struct {
+		testName           string
+		node               *v1.Node
+		expectedCalls      []string
+		existsByNodeName   bool
+		existsByProviderID bool
+		nodeNameErr        error
+		providerIDErr      error
+	}{
+		{
+			testName:           "node exists by provider id",
+			existsByProviderID: true,
+			providerIDErr:      nil,
+			existsByNodeName:   false,
+			nodeNameErr:        errors.New("unimplemented"),
+			expectedCalls:      []string{"instance-exists-by-provider-id"},
+			node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "node0",
+				},
+				Spec: v1.NodeSpec{
+					ProviderID: "node0",
+				},
+			},
+		},
+		{
+			testName:           "does not exist by provider id",
+			existsByProviderID: false,
+			providerIDErr:      nil,
+			existsByNodeName:   false,
+			nodeNameErr:        errors.New("unimplemented"),
+			expectedCalls:      []string{"instance-exists-by-provider-id"},
+			node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "node0",
+				},
+				Spec: v1.NodeSpec{
+					ProviderID: "node0",
+				},
+			},
+		},
+		{
+			testName:           "node exists by node name",
+			existsByProviderID: false,
+			providerIDErr:      errors.New("unimplemented"),
+			existsByNodeName:   true,
+			nodeNameErr:        nil,
+			expectedCalls:      []string{"instance-exists-by-provider-id", "external-id"},
+			node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "node0",
+				},
+				Spec: v1.NodeSpec{
+					ProviderID: "node0",
+				},
+			},
+		},
+		{
+			testName:           "does not exist by node name",
+			existsByProviderID: false,
+			providerIDErr:      errors.New("unimplemented"),
+			existsByNodeName:   false,
+			nodeNameErr:        cloudprovider.InstanceNotFound,
+			expectedCalls:      []string{"instance-exists-by-provider-id", "external-id"},
+			node: &v1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "node0",
+				},
+				Spec: v1.NodeSpec{
+					ProviderID: "node0",
+				},
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.testName, func(t *testing.T) {
+			fc := &fakecloud.FakeCloud{
+				Exists:             tc.existsByNodeName,
+				ExistsByProviderID: tc.existsByProviderID,
+				Err:                tc.nodeNameErr,
+				ErrByProviderID:    tc.providerIDErr,
+			}
+
+			instances, _ := fc.Instances()
+			exists, err := ensureNodeExistsByProviderIDOrName(instances, tc.node)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if !reflect.DeepEqual(fc.Calls, tc.expectedCalls) {
+				t.Fatalf("expected cloud provider methods `%v` to be called but `%v` was called ", tc.expectedCalls, fc.Calls)
+			}
+
+			if tc.existsByProviderID && tc.existsByProviderID != exists {
+				t.Fatalf("expected exist by provider id to be `%t` but got `%t`", tc.existsByProviderID, exists)
+			}
+
+			if tc.existsByNodeName && tc.existsByNodeName != exists {
+				t.Fatalf("expected exist by node name to be `%t` but got `%t`", tc.existsByNodeName, exists)
+			}
+
+			if !tc.existsByNodeName && !tc.existsByProviderID && exists {
+				t.Fatal("node is not supposed to exist")
+			}
+
+		})
+	}
+
+}
+
 // This test checks that the node is deleted when kubelet stops reporting
 // and cloud provider says node is gone
 func TestNodeDeleted(t *testing.T) {
@@ -105,9 +220,12 @@ func TestNodeDeleted(t *testing.T) {
 
 	eventBroadcaster := record.NewBroadcaster()
 	cloudNodeController := &CloudNodeController{
-		kubeClient:                fnh,
-		nodeInformer:              factory.Core().V1().Nodes(),
-		cloud:                     &fakecloud.FakeCloud{Err: cloudprovider.InstanceNotFound},
+		kubeClient:   fnh,
+		nodeInformer: factory.Core().V1().Nodes(),
+		cloud: &fakecloud.FakeCloud{
+			ExistsByProviderID: false,
+			Err:                nil,
+		},
 		nodeMonitorPeriod:         1 * time.Second,
 		recorder:                  eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "cloud-controller-manager"}),
 		nodeStatusUpdateFrequency: 1 * time.Second,
@@ -520,7 +638,8 @@ func TestNodeAddresses(t *testing.T) {
 			FailureDomain: "us-west-1a",
 			Region:        "us-west",
 		},
-		Err: nil,
+		ExistsByProviderID: true,
+		Err:                nil,
 	}
 
 	eventBroadcaster := record.NewBroadcaster()
@@ -639,7 +758,8 @@ func TestNodeProvidedIPAddresses(t *testing.T) {
 			FailureDomain: "us-west-1a",
 			Region:        "us-west",
 		},
-		Err: nil,
+		ExistsByProviderID: true,
+		Err:                nil,
 	}
 
 	eventBroadcaster := record.NewBroadcaster()

pkg/volume/cinder/attacher_test.go

@@ -650,6 +650,10 @@ func (instances *instances) InstanceTypeByProviderID(providerID string) (string,
 	return "", errors.New("Not implemented")
 }
 
+func (instances *instances) InstanceExistsByProviderID(providerID string) (bool, error) {
+	return false, errors.New("unimplemented")
+}
+
 func (instances *instances) List(filter string) ([]types.NodeName, error) {
 	return []types.NodeName{}, errors.New("Not implemented")
 }