nodes updated with labels matching update selector should be added to the queue in daemonset controller

pkg/controller/daemonset/daemonset_event_handler.go

@@ -259,7 +259,9 @@ func (e *nodeEventHandler) Update(evt event.UpdateEvent, q workqueue.RateLimitin
 		ds := &dsList.Items[i]
 		oldShouldRun, oldShouldContinueRunning := nodeShouldRunDaemonPod(oldNode, ds)
 		currentShouldRun, currentShouldContinueRunning := nodeShouldRunDaemonPod(curNode, ds)
-		if (oldShouldRun != currentShouldRun) || (oldShouldContinueRunning != currentShouldContinueRunning) {
+		if (oldShouldRun != currentShouldRun) || (oldShouldContinueRunning != currentShouldContinueRunning) ||
+			(NodeShouldUpdateBySelector(oldNode, ds) != NodeShouldUpdateBySelector(curNode, ds)) {
+			klog.V(6).Infof("update node: %s triggers DaemonSet %s/%s to reconcile.", curNode.Name, ds.GetNamespace(), ds.GetName())
 			q.Add(reconcile.Request{NamespacedName: types.NamespacedName{
 				Name:      ds.GetName(),
 				Namespace: ds.GetNamespace(),

pkg/controller/daemonset/daemonset_util.go

@@ -305,3 +305,24 @@ func findUpdatedPodsOnNode(ds *appsv1alpha1.DaemonSet, podsOnNode []*corev1.Pod,
 	}
 	return newPod, oldPod, true
 }
+
+// NodeShouldUpdateBySelector checks if the node is selected to upgrade for ds's gray update selector.
+// This function does not check NodeShouldRunDaemonPod
+func NodeShouldUpdateBySelector(node *corev1.Node, ds *appsv1alpha1.DaemonSet) bool {
+	switch ds.Spec.UpdateStrategy.Type {
+	case appsv1alpha1.OnDeleteDaemonSetStrategyType:
+		return false
+	case appsv1alpha1.RollingUpdateDaemonSetStrategyType:
+		if ds.Spec.UpdateStrategy.RollingUpdate == nil || ds.Spec.UpdateStrategy.RollingUpdate.Selector == nil {
+			return false
+		}
+		selector, err := metav1.LabelSelectorAsSelector(ds.Spec.UpdateStrategy.RollingUpdate.Selector)
+		if err != nil {
+			// this should not happen if the DaemonSet passed validation
+			return false
+		}
+		return !selector.Empty() && selector.Matches(labels.Set(node.Labels))
+	default:
+		return false
+	}
+}

pkg/controller/daemonset/daemonset_util_test.go

@@ -650,3 +650,69 @@ func TestGetMaxCreateNum(t *testing.T) {
 		})
 	}
 }
+
+func TestNodeShouldUpdateBySelector(t *testing.T) {
+	for _, tt := range []struct {
+		Title    string
+		Node     *corev1.Node
+		Ds       *appsv1alpha1.DaemonSet
+		Expected bool
+	}{
+		{
+			"node with no label",
+			newNode("node1", nil),
+			newDaemonSet("ds1"),
+			false,
+		},
+		{
+			"node with label, not selected",
+			newNode("node1", map[string]string{
+				"key1": "value1",
+			}),
+			func() *appsv1alpha1.DaemonSet {
+				ds := newDaemonSet("ds1")
+				ds.Spec.UpdateStrategy = newStandardRollingUpdateStrategy(map[string]string{
+					"key1": "value2",
+				})
+				return ds
+			}(),
+			false,
+		},
+		{
+			"node with label, selected",
+			newNode("node1", map[string]string{
+				"key1": "value1",
+			}),
+			func() *appsv1alpha1.DaemonSet {
+				ds := newDaemonSet("ds1")
+				ds.Spec.UpdateStrategy = newStandardRollingUpdateStrategy(map[string]string{
+					"key1": "value1",
+				})
+				return ds
+			}(),
+			true,
+		},
+	} {
+		t.Logf("\t%s", tt.Title)
+		should := NodeShouldUpdateBySelector(tt.Node, tt.Ds)
+		if should != tt.Expected {
+			t.Errorf("NodeShouldUpdateBySelector() = %v, want %v", should, tt.Expected)
+		}
+	}
+}
+
+func newStandardRollingUpdateStrategy(matchLabels map[string]string) appsv1alpha1.DaemonSetUpdateStrategy {
+	one := intstr.FromInt(1)
+	strategy := appsv1alpha1.DaemonSetUpdateStrategy{
+		Type: appsv1alpha1.RollingUpdateDaemonSetStrategyType,
+		RollingUpdate: &appsv1alpha1.RollingUpdateDaemonSet{
+			MaxUnavailable: &one,
+			Selector:       nil,
+			Type:           appsv1alpha1.StandardRollingUpdateType,
+		},
+	}
+	if len(matchLabels) > 0 {
+		strategy.RollingUpdate.Selector = &metav1.LabelSelector{MatchLabels: matchLabels}
+	}
+	return strategy
+}