Introduce scheduled event checking for Azure VMs via instance metadata #9170
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright 2019 The Kubernetes Authors. | ||
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| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package nodemanager | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
| "time" | ||
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| v1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| clientset "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/record" | ||
| "k8s.io/klog/v2" | ||
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| "sigs.k8s.io/cloud-provider-azure/pkg/provider" | ||
| utilnode "sigs.k8s.io/cloud-provider-azure/pkg/util/node" | ||
| ) | ||
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| const ( | ||
| conditionType = "ScheduledEvent" | ||
| ) | ||
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| // EventChecker periodically checks for Azure scheduled events and updates the Kubernetes node status accordingly. | ||
| type EventChecker struct { | ||
| nodeName string | ||
| kubeClient clientset.Interface | ||
| recorder record.EventRecorder | ||
| imds *provider.InstanceMetadataService | ||
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| updateFrequency time.Duration | ||
| } | ||
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| // NewEventChecker creates a new EventChecker instance | ||
| func NewEventChecker(nodeName string, kubeClient clientset.Interface, metadataService *provider.InstanceMetadataService, updateFrequency time.Duration) *EventChecker { | ||
| return &EventChecker{ | ||
| imds: metadataService, | ||
| nodeName: nodeName, | ||
| kubeClient: kubeClient, | ||
| updateFrequency: updateFrequency, | ||
| } | ||
| } | ||
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| // Run starts the event checker loop that periodically checks for Azure scheduled events | ||
| func (ec *EventChecker) Run(ctx context.Context) { | ||
| ticker := time.NewTicker(ec.updateFrequency) | ||
| defer ticker.Stop() | ||
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| klog.Infof("Starting Azure scheduled event checker for node %s with update frequency %s", ec.nodeName, ec.updateFrequency) | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| klog.Infof("Stopping Azure scheduled event checker for node %s", ec.nodeName) | ||
| return | ||
| case <-ticker.C: | ||
| if err := ec.CheckAzureScheduledEvents(context.Background()); err != nil { | ||
| klog.Errorf("Failed to check Azure scheduled events: %v", err) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| // CheckAzureScheduledEvents queries the Azure metadata service for scheduled events | ||
| // and updates the Kubernetes node with a custom condition "NodeEvent". | ||
| func (ec *EventChecker) CheckAzureScheduledEvents(ctx context.Context) error { | ||
| eventResponse, err := ec.imds.GetScheduledEvents() | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| node, err := ec.kubeClient.CoreV1().Nodes().Get(ctx, ec.nodeName, metav1.GetOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| currentCondition := ec.GetNodeEventCondition(node.Status.Conditions) | ||
| if len(eventResponse.Events) == 0 { | ||
| targetCondition := v1.NodeCondition{ | ||
| Type: conditionType, | ||
| Status: v1.ConditionFalse, | ||
| Reason: "NoScheduledEvents", | ||
| Message: "No scheduled events found", | ||
| } | ||
| if currentCondition == nil || targetCondition.Status != currentCondition.Status { | ||
| klog.Infof("No scheduled events found for node %s, updating condition to %s", ec.nodeName, targetCondition.Status) | ||
| return utilnode.SetNodeCondition(ec.kubeClient, types.NodeName(ec.nodeName), targetCondition) | ||
| } | ||
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| return nil // No events to process, and no change in condition | ||
| } | ||
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| targetCondition := ScheduledEventCondition(*eventResponse) | ||
| if currentCondition == nil || targetCondition.Message != currentCondition.Message { | ||
| klog.Infof("Scheduled events found for node %s, updating condition to %s", ec.nodeName, targetCondition.Status) | ||
| return utilnode.SetNodeCondition(ec.kubeClient, types.NodeName(ec.nodeName), targetCondition) | ||
| } | ||
| return nil | ||
| } | ||
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| func (ec *EventChecker) GetNodeEventCondition(conditions []v1.NodeCondition) *v1.NodeCondition { | ||
| for _, condition := range conditions { | ||
| if condition.Type == conditionType { | ||
| return &condition | ||
| } | ||
| } | ||
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| return nil | ||
| } | ||
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| func ScheduledEventCondition(event provider.EventResponse) v1.NodeCondition { | ||
| nodeCondition := v1.NodeCondition{ | ||
| Type: conditionType, | ||
| Status: v1.ConditionTrue, | ||
| LastTransitionTime: metav1.Time{Time: time.Now()}, | ||
| Reason: "ScheduledEventExists", | ||
| } | ||
| var messages []string | ||
| for _, ev := range event.Events { | ||
| messages = append(messages, fmt.Sprintf("EventID: %s, EventSource: %s, EventType: %s, NotBefore: %s, Duration: %d seconds, Description: %s", ev.EventID, ev.EventSource, ev.EventType, ev.NotBefore, ev.DurationInSeconds, ev.Description)) | ||
| } | ||
| nodeCondition.Message = strings.Join(messages, "; ") | ||
| return nodeCondition | ||
| } | ||
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Can we default to false, and enable as needed?
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+1. we'd need user to enable this feature by the new flag