[FG:InPlacePodVerticalScaling] surface pod resize actuation errors in pod resize conditions (#130902)

* surface pod resize actuation errors in pod resize conditions

* update kubelet unit tests

* fix all other kubelet unit tests

* fix linter error

* address feedback

* fix test failure

pkg/kubelet/container/sync_result.go

@@ -45,6 +45,8 @@ var (
 	ErrConfigPodSandbox = errors.New("ConfigPodSandboxError")
 	// ErrKillPodSandbox returned when runtime failed to stop pod's sandbox.
 	ErrKillPodSandbox = errors.New("KillPodSandboxError")
+	// ErrResizePodInPlace returned when runtime failed to resize a pod.
+	ErrResizePodInPlace = errors.New("ResizePodInPlaceError")
 )
 
 // SyncAction indicates different kind of actions in SyncPod() and KillPod(). Now there are only actions
@@ -68,6 +70,8 @@ const (
 	ConfigPodSandbox SyncAction = "ConfigPodSandbox"
 	// KillPodSandbox action
 	KillPodSandbox SyncAction = "KillPodSandbox"
+	// ResizePodInPlace action is included whenever any containers in the pod are resized without restart
+	ResizePodInPlace SyncAction = "ResizePodInPlace"
 )
 
 // SyncResult is the result of sync action.

pkg/kubelet/container/testing/fake_runtime.go

@@ -61,6 +61,7 @@ type FakeRuntime struct {
 	VersionInfo       string
 	APIVersionInfo    string
 	RuntimeType       string
+	SyncResults       *kubecontainer.PodSyncResult
 	Err               error
 	InspectErr        error
 	StatusErr         error
@@ -238,6 +239,9 @@ func (f *FakeRuntime) SyncPod(_ context.Context, pod *v1.Pod, _ *kubecontainer.P
 	for _, c := range pod.Spec.Containers {
 		f.StartedContainers = append(f.StartedContainers, c.Name)
 	}
+	if f.SyncResults != nil {
+		return *f.SyncResults
+	}
 	// TODO(random-liu): Add SyncResult for starting and killing containers
 	if f.Err != nil {
 		result.Fail(f.Err)

pkg/kubelet/kubelet.go

@@ -2066,20 +2066,19 @@ func (kl *Kubelet) SyncPod(ctx context.Context, updateType kubetypes.SyncPodType
 	sctx := context.WithoutCancel(ctx)
 	result := kl.containerRuntime.SyncPod(sctx, pod, podStatus, pullSecrets, kl.crashLoopBackOff)
 	kl.reasonCache.Update(pod.UID, result)
-	if err := result.Error(); err != nil {
+
-		// Do not return error if the only failures were pods in backoff
 	for _, r := range result.SyncResults {
-			if r.Error != kubecontainer.ErrCrashLoopBackOff && r.Error != images.ErrImagePullBackOff {
+		if r.Action == kubecontainer.ResizePodInPlace {
-				// Do not record an event here, as we keep all event logging for sync pod failures
+			if r.Error == nil {
-				// local to container runtime, so we get better errors.
+				// The pod was resized successfully, clear any pod resize errors in the PodResizeInProgress condition.
-				return false, err
+				kl.statusManager.SetPodResizeInProgressCondition(pod.UID, "", "", true)
+			} else {
+				kl.statusManager.SetPodResizeInProgressCondition(pod.UID, v1.PodReasonError, r.Message, false)
+			}
 		}
 	}
 
-		return false, nil
+	return false, result.Error()
-	}
-
-	return false, nil
 }
 
 // SyncTerminatingPod is expected to terminate all running containers in a pod. Once this method
@@ -2932,7 +2931,7 @@ func (kl *Kubelet) handlePodResourcesResize(pod *v1.Pod, podStatus *kubecontaine
 		}
 		if kl.isPodResizeInProgress(allocatedPod, podStatus) {
 			// If a resize is in progress, make sure the cache has the correct state in case the Kubelet restarted.
-			kl.statusManager.SetPodResizeInProgressCondition(pod.UID, "", "")
+			kl.statusManager.SetPodResizeInProgressCondition(pod.UID, "", "", false)
 		} else {
 			// (Allocated == Actual) => clear the resize in-progress status.
 			kl.statusManager.ClearPodResizeInProgressCondition(pod.UID)
@@ -2961,6 +2960,11 @@ func (kl *Kubelet) handlePodResourcesResize(pod *v1.Pod, podStatus *kubecontaine
 			return nil, err
 		}
 		kl.statusManager.ClearPodResizePendingCondition(pod.UID)
+
+		// Clear any errors that may have been surfaced from a previous resize. The condition will be
+		// added back as needed in the defer block, but this prevents old errors from being preserved.
+		kl.statusManager.ClearPodResizeInProgressCondition(pod.UID)
+
 		for i, container := range pod.Spec.Containers {
 			if !apiequality.Semantic.DeepEqual(container.Resources, podFromAllocation.Spec.Containers[i].Resources) {
 				key := kuberuntime.GetStableKey(pod, &container)

pkg/kubelet/kubelet_test.go

@@ -4138,5 +4138,112 @@ func TestCrashLoopBackOffConfiguration(t *testing.T) {
 			assert.Equalf(t, tc.expectedInitial, resultInitial, "wrong base calculated, want: %v, got %v", tc.expectedInitial, resultInitial)
 		})
 	}
-
+}
+
+func TestSyncPodWithErrorsDuringInPlacePodResize(t *testing.T) {
+	testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
+	defer testKubelet.Cleanup()
+	kubelet := testKubelet.kubelet
+
+	pod := podWithUIDNameNsSpec("12345678", "foo", "new", v1.PodSpec{
+		Containers: []v1.Container{
+			{Name: "bar"},
+		},
+	})
+
+	testCases := []struct {
+		name                     string
+		syncResults              *kubecontainer.PodSyncResult
+		expectedErr              string
+		expectedResizeConditions []*v1.PodCondition
+	}{
+		{
+			name: "pod resize error returned from the runtime",
+			syncResults: &kubecontainer.PodSyncResult{
+				SyncResults: []*kubecontainer.SyncResult{{
+					Action:  kubecontainer.ResizePodInPlace,
+					Target:  pod.UID,
+					Error:   kubecontainer.ErrResizePodInPlace,
+					Message: "could not resize pod",
+				}},
+			},
+			expectedErr: "failed to \"ResizePodInPlace\" for \"12345678\" with ResizePodInPlaceError: \"could not resize pod\"",
+			expectedResizeConditions: []*v1.PodCondition{{
+				Type:    v1.PodResizeInProgress,
+				Status:  v1.ConditionTrue,
+				Reason:  v1.PodReasonError,
+				Message: "could not resize pod",
+			}},
+		},
+		{
+			name: "pod resize error cleared upon successful run",
+			syncResults: &kubecontainer.PodSyncResult{
+				SyncResults: []*kubecontainer.SyncResult{{
+					Action: kubecontainer.ResizePodInPlace,
+					Target: pod.UID,
+				}},
+			},
+			expectedResizeConditions: []*v1.PodCondition{{
+				Type:   v1.PodResizeInProgress,
+				Status: v1.ConditionTrue,
+			}},
+		},
+		{
+			name: "sync results have a non-resize error",
+			syncResults: &kubecontainer.PodSyncResult{
+				SyncResults: []*kubecontainer.SyncResult{{
+					Action:  kubecontainer.CreatePodSandbox,
+					Target:  pod.UID,
+					Error:   kubecontainer.ErrCreatePodSandbox,
+					Message: "could not create pod sandbox",
+				}},
+			},
+			expectedErr:              "failed to \"CreatePodSandbox\" for \"12345678\" with CreatePodSandboxError: \"could not create pod sandbox\"",
+			expectedResizeConditions: nil,
+		},
+		{
+			name: "sync results have a non-resize error and a successful pod resize action",
+			syncResults: &kubecontainer.PodSyncResult{
+				SyncResults: []*kubecontainer.SyncResult{
+					{
+						Action:  kubecontainer.CreatePodSandbox,
+						Target:  pod.UID,
+						Error:   kubecontainer.ErrCreatePodSandbox,
+						Message: "could not create pod sandbox",
+					},
+					{
+						Action: kubecontainer.ResizePodInPlace,
+						Target: pod.UID,
+					},
+				},
+			},
+			expectedErr: "failed to \"CreatePodSandbox\" for \"12345678\" with CreatePodSandboxError: \"could not create pod sandbox\"",
+			expectedResizeConditions: []*v1.PodCondition{{
+				Type:   v1.PodResizeInProgress,
+				Status: v1.ConditionTrue,
+			}},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			testKubelet.fakeRuntime.SyncResults = tc.syncResults
+			kubelet.podManager.SetPods([]*v1.Pod{pod})
+			isTerminal, err := kubelet.SyncPod(context.Background(), kubetypes.SyncPodUpdate, pod, nil, &kubecontainer.PodStatus{})
+			require.False(t, isTerminal)
+			if tc.expectedErr == "" {
+				require.NoError(t, err)
+			} else {
+				require.Error(t, err)
+				require.Equal(t, tc.expectedErr, err.Error())
+			}
+			gotResizeConditions := kubelet.statusManager.GetPodResizeConditions(pod.UID)
+			for _, c := range gotResizeConditions {
+				// ignore last probe and transition times for comparison
+				c.LastProbeTime = metav1.Time{}
+				c.LastTransitionTime = metav1.Time{}
+			}
+			require.Equal(t, tc.expectedResizeConditions, gotResizeConditions)
+		})
+	}
 }

pkg/kubelet/kuberuntime/kuberuntime_manager.go

@@ -693,7 +693,8 @@ func (m *kubeGenericRuntimeManager) computePodResizeAction(pod *v1.Pod, containe
 	return true
 }
 
-func (m *kubeGenericRuntimeManager) doPodResizeAction(pod *v1.Pod, podContainerChanges podActions, result *kubecontainer.PodSyncResult) {
+func (m *kubeGenericRuntimeManager) doPodResizeAction(pod *v1.Pod, podContainerChanges podActions) *kubecontainer.SyncResult {
+	resizeResult := kubecontainer.NewSyncResult(kubecontainer.ResizePodInPlace, format.Pod(pod))
 	pcm := m.containerManager.NewPodContainerManager()
 	//TODO(vinaykul,InPlacePodVerticalScaling): Figure out best way to get enforceMemoryQoS value (parameter #4 below) in platform-agnostic way
 	enforceCPULimits := m.cpuCFSQuota
@@ -704,20 +705,20 @@ func (m *kubeGenericRuntimeManager) doPodResizeAction(pod *v1.Pod, podContainerC
 	podResources := cm.ResourceConfigForPod(pod, enforceCPULimits, uint64((m.cpuCFSQuotaPeriod.Duration)/time.Microsecond), false)
 	if podResources == nil {
 		klog.ErrorS(nil, "Unable to get resource configuration", "pod", klog.KObj(pod))
-		result.Fail(fmt.Errorf("unable to get resource configuration processing resize for pod %s", pod.Name))
+		resizeResult.Fail(kubecontainer.ErrResizePodInPlace, fmt.Sprintf("unable to get resource configuration processing resize for pod %s", pod.Name))
-		return
+		return resizeResult
 	}
 	currentPodMemoryConfig, err := pcm.GetPodCgroupConfig(pod, v1.ResourceMemory)
 	if err != nil {
 		klog.ErrorS(nil, "Unable to get pod cgroup memory config", "pod", klog.KObj(pod))
-		result.Fail(fmt.Errorf("unable to get pod cgroup memory config for pod %s", pod.Name))
+		resizeResult.Fail(kubecontainer.ErrResizePodInPlace, fmt.Sprintf("unable to get pod cgroup memory config for pod %s", pod.Name))
-		return
+		return resizeResult
 	}
 	currentPodCPUConfig, err := pcm.GetPodCgroupConfig(pod, v1.ResourceCPU)
 	if err != nil {
 		klog.ErrorS(nil, "Unable to get pod cgroup cpu config", "pod", klog.KObj(pod))
-		result.Fail(fmt.Errorf("unable to get pod cgroup cpu config for pod %s", pod.Name))
+		resizeResult.Fail(kubecontainer.ErrResizePodInPlace, fmt.Sprintf("unable to get pod cgroup cpu config for pod %s", pod.Name))
-		return
+		return resizeResult
 	}
 
 	currentPodResources := podResources
@@ -800,13 +801,13 @@ func (m *kubeGenericRuntimeManager) doPodResizeAction(pod *v1.Pod, podContainerC
 			currentPodMemoryUsage, err := pcm.GetPodCgroupMemoryUsage(pod)
 			if err != nil {
 				klog.ErrorS(err, "GetPodCgroupMemoryUsage failed", "pod", pod.Name)
-				result.Fail(err)
+				resizeResult.Fail(kubecontainer.ErrResizePodInPlace, err.Error())
-				return
+				return resizeResult
 			}
 			if currentPodMemoryUsage >= uint64(*podResources.Memory) {
 				klog.ErrorS(nil, "Aborting attempt to set pod memory limit less than current memory usage", "pod", pod.Name)
-				result.Fail(fmt.Errorf("aborting attempt to set pod memory limit less than current memory usage for pod %s", pod.Name))
+				resizeResult.Fail(kubecontainer.ErrResizePodInPlace, fmt.Sprintf("aborting attempt to set pod memory limit less than current memory usage for pod %s", pod.Name))
-				return
+				return resizeResult
 			}
 		} else {
 			// Default pod memory limit to the current memory limit if unset to prevent it from updating.
@@ -814,16 +815,16 @@ func (m *kubeGenericRuntimeManager) doPodResizeAction(pod *v1.Pod, podContainerC
 			podResources.Memory = currentPodMemoryConfig.Memory
 		}
 		if errResize := resizeContainers(v1.ResourceMemory, int64(*currentPodMemoryConfig.Memory), *podResources.Memory, 0, 0); errResize != nil {
-			result.Fail(errResize)
+			resizeResult.Fail(kubecontainer.ErrResizePodInPlace, errResize.Error())
-			return
+			return resizeResult
 		}
 	}
 	if len(podContainerChanges.ContainersToUpdate[v1.ResourceCPU]) > 0 || podContainerChanges.UpdatePodResources {
 		if podResources.CPUShares == nil {
 			// This shouldn't happen: ResourceConfigForPod always returns a non-nil value for CPUShares.
 			klog.ErrorS(nil, "podResources.CPUShares is nil", "pod", pod.Name)
-			result.Fail(fmt.Errorf("podResources.CPUShares is nil for pod %s", pod.Name))
+			resizeResult.Fail(kubecontainer.ErrResizePodInPlace, fmt.Sprintf("podResources.CPUShares is nil for pod %s", pod.Name))
-			return
+			return resizeResult
 		}
 
 		// Default pod CPUQuota to the current CPUQuota if no limit is set to prevent the pod limit
@@ -834,10 +835,11 @@ func (m *kubeGenericRuntimeManager) doPodResizeAction(pod *v1.Pod, podContainerC
 		}
 		if errResize := resizeContainers(v1.ResourceCPU, *currentPodCPUConfig.CPUQuota, *podResources.CPUQuota,
 			int64(*currentPodCPUConfig.CPUShares), int64(*podResources.CPUShares)); errResize != nil {
-			result.Fail(errResize)
+			resizeResult.Fail(kubecontainer.ErrResizePodInPlace, errResize.Error())
-			return
+			return resizeResult
 		}
 	}
+	return resizeResult
 }
 
 func (m *kubeGenericRuntimeManager) updatePodContainerResources(pod *v1.Pod, resourceName v1.ResourceName, containersToUpdate []containerToUpdateInfo) error {
@@ -1401,7 +1403,7 @@ func (m *kubeGenericRuntimeManager) SyncPod(ctx context.Context, pod *v1.Pod, po
 	// Step 7: For containers in podContainerChanges.ContainersToUpdate[CPU,Memory] list, invoke UpdateContainerResources
 	if resizable, _ := IsInPlacePodVerticalScalingAllowed(pod); resizable {
 		if len(podContainerChanges.ContainersToUpdate) > 0 || podContainerChanges.UpdatePodResources {
-			m.doPodResizeAction(pod, podContainerChanges, &result)
+			result.SyncResults = append(result.SyncResults, m.doPodResizeAction(pod, podContainerChanges))
 		}
 	}
 

pkg/kubelet/kuberuntime/kuberuntime_manager_test.go

@@ -67,7 +67,14 @@ var (
 )
 
 func createTestRuntimeManager() (*apitest.FakeRuntimeService, *apitest.FakeImageService, *kubeGenericRuntimeManager, error) {
+	return createTestRuntimeManagerWithErrors(nil)
+}
+
+func createTestRuntimeManagerWithErrors(errors map[string][]error) (*apitest.FakeRuntimeService, *apitest.FakeImageService, *kubeGenericRuntimeManager, error) {
 	fakeRuntimeService := apitest.NewFakeRuntimeService()
+	if errors != nil {
+		fakeRuntimeService.Errors = errors
+	}
 	fakeImageService := apitest.NewFakeImageService()
 	// Only an empty machineInfo is needed here, because in unit test all containers are besteffort,
 	// data in machineInfo is not used. If burstable containers are used in unit test in the future,
@@ -3186,9 +3193,6 @@ func TestDoPodResizeAction(t *testing.T) {
 	}
 
 	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.InPlacePodVerticalScaling, true)
-	_, _, m, err := createTestRuntimeManager()
-	require.NoError(t, err)
-	m.cpuCFSQuota = true // Enforce CPU Limits
 
 	for _, tc := range []struct {
 		testName                  string
@@ -3196,7 +3200,9 @@ func TestDoPodResizeAction(t *testing.T) {
 		desiredResources          containerResources
 		updatedResources          []v1.ResourceName
 		otherContainersHaveLimits bool
+		runtimeErrors             map[string][]error
 		expectedError             string
+		expectedErrorMessage      string
 		expectPodCgroupUpdates    int
 	}{
 		{
@@ -3213,6 +3219,23 @@ func TestDoPodResizeAction(t *testing.T) {
 			updatedResources:          []v1.ResourceName{v1.ResourceCPU, v1.ResourceMemory},
 			expectPodCgroupUpdates:    3, // cpu req, cpu lim, mem lim
 		},
+		{
+			testName: "Increase cpu and memory requests and limits, with computed pod limits and set a runtime error",
+			currentResources: containerResources{
+				cpuRequest: 100, cpuLimit: 100,
+				memoryRequest: 100, memoryLimit: 100,
+			},
+			desiredResources: containerResources{
+				cpuRequest: 200, cpuLimit: 200,
+				memoryRequest: 200, memoryLimit: 200,
+			},
+			otherContainersHaveLimits: true,
+			updatedResources:          []v1.ResourceName{v1.ResourceCPU, v1.ResourceMemory},
+			expectPodCgroupUpdates:    1,
+			runtimeErrors:             map[string][]error{"UpdateContainerResources": {fmt.Errorf("error updating container resources")}},
+			expectedError:             "ResizePodInPlaceError",
+			expectedErrorMessage:      "error updating container resources",
+		},
 		{
 			testName: "Increase cpu and memory requests and limits, without computed pod limits",
 			currentResources: containerResources{
@@ -3296,6 +3319,10 @@ func TestDoPodResizeAction(t *testing.T) {
 		},
 	} {
 		t.Run(tc.testName, func(t *testing.T) {
+			_, _, m, err := createTestRuntimeManagerWithErrors(tc.runtimeErrors)
+			require.NoError(t, err)
+			m.cpuCFSQuota = true // Enforce CPU Limits
+
 			mockCM := cmtesting.NewMockContainerManager(t)
 			mockCM.EXPECT().PodHasExclusiveCPUs(mock.Anything).Return(false).Maybe()
 			mockCM.EXPECT().ContainerHasExclusiveCPUs(mock.Anything, mock.Anything).Return(false).Maybe()
@@ -3358,17 +3385,17 @@ func TestDoPodResizeAction(t *testing.T) {
 				containersToUpdate[r] = []containerToUpdateInfo{updateInfo}
 			}
 
-			syncResult := &kubecontainer.PodSyncResult{}
 			actions := podActions{
 				ContainersToUpdate: containersToUpdate,
 			}
-			m.doPodResizeAction(pod, actions, syncResult)
+			resizeResult := m.doPodResizeAction(pod, actions)
 
 			if tc.expectedError != "" {
-				require.Error(t, syncResult.Error())
+				require.Error(t, resizeResult.Error)
-				require.EqualError(t, syncResult.Error(), tc.expectedError)
+				require.EqualError(t, resizeResult.Error, tc.expectedError)
+				require.Equal(t, tc.expectedErrorMessage, resizeResult.Message)
 			} else {
-				require.NoError(t, syncResult.Error())
+				require.NoError(t, resizeResult.Error)
 			}
 
 			mock.AssertExpectationsForObjects(t, mockPCM)

pkg/kubelet/status/status_manager.go

@@ -159,7 +159,7 @@ type Manager interface {
 	SetPodResizePendingCondition(podUID types.UID, reason, message string)
 
 	// SetPodResizeInProgressCondition caches the last PodResizeInProgress condition for the pod.
-	SetPodResizeInProgressCondition(podUID types.UID, reason, message string)
+	SetPodResizeInProgressCondition(podUID types.UID, reason, message string, allowReasonToBeCleared bool)
 
 	// ClearPodResizePendingCondition clears the PodResizePending condition for the pod from the cache.
 	ClearPodResizePendingCondition(podUID types.UID)
@@ -266,10 +266,22 @@ func (m *manager) SetPodResizePendingCondition(podUID types.UID, reason, message
 }
 
 // SetPodResizeInProgressCondition caches the last PodResizeInProgress condition for the pod.
-func (m *manager) SetPodResizeInProgressCondition(podUID types.UID, reason, message string) {
+func (m *manager) SetPodResizeInProgressCondition(podUID types.UID, reason, message string, allowReasonToBeCleared bool) {
+	oldConditions := m.GetPodResizeConditions(podUID)
+
 	m.podStatusesLock.Lock()
 	defer m.podStatusesLock.Unlock()
 
+	if !allowReasonToBeCleared && reason == "" && message == "" {
+		// Preserve the old reason and message if there is one.
+		for _, c := range oldConditions {
+			if c.Type == v1.PodResizeInProgress {
+				reason = c.Reason
+				message = c.Message
+			}
+		}
+	}
+
 	m.podResizeConditions[podUID] = podResizeConditions{
 		PodResizeInProgress: updatedPodResizeCondition(v1.PodResizeInProgress, m.podResizeConditions[podUID].PodResizeInProgress, reason, message),
 		PodResizePending:    m.podResizeConditions[podUID].PodResizePending,

pkg/kubelet/status/status_manager_test.go

@@ -2047,7 +2047,7 @@ func TestPodResizeConditions(t *testing.T) {
 		{
 			name: "set pod resize in progress condition with reason and message",
 			updateFunc: func(podUID types.UID) {
-				m.SetPodResizeInProgressCondition(podUID, "some-reason", "some-message")
+				m.SetPodResizeInProgressCondition(podUID, "some-reason", "some-message", false)
 			},
 			expected: []*v1.PodCondition{
 				{
@@ -2059,9 +2059,23 @@ func TestPodResizeConditions(t *testing.T) {
 			},
 		},
 		{
-			name: "set pod resize in progress condition without reason and message",
+			name: "set pod resize in progress condition without reason and message/allowReasonToBeCleared=false",
 			updateFunc: func(podUID types.UID) {
-				m.SetPodResizeInProgressCondition(podUID, "", "")
+				m.SetPodResizeInProgressCondition(podUID, "", "", false)
+			},
+			expected: []*v1.PodCondition{
+				{
+					Type:    v1.PodResizeInProgress,
+					Status:  v1.ConditionTrue,
+					Reason:  "some-reason",
+					Message: "some-message",
+				},
+			},
+		},
+		{
+			name: "set pod resize in progress condition without reason and message/allowReasonToBeCleared=true",
+			updateFunc: func(podUID types.UID) {
+				m.SetPodResizeInProgressCondition(podUID, "", "", true)
 			},
 			expected: []*v1.PodCondition{
 				{