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Enable the VPAAndHPA autoscaling mode for the gardener-apiserver
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| // SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
|
|
||
| package apiserver | ||
|
|
||
| import ( | ||
| appsv1 "k8s.io/api/apps/v1" | ||
| autoscalingv2 "k8s.io/api/autoscaling/v2" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/resource" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/utils/ptr" | ||
|
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| resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1" | ||
| "github.com/gardener/gardener/pkg/component/apiserver" | ||
| "github.com/gardener/gardener/pkg/utils" | ||
| ) | ||
|
|
||
| func (g *gardenerAPIServer) horizontalPodAutoscaler() *autoscalingv2.HorizontalPodAutoscaler { | ||
| if g.values.Autoscaling.Mode != apiserver.AutoscalingModeVPAAndHPA { | ||
| return nil | ||
| } | ||
|
|
||
| return g.horizontalPodAutoscalerInVPAAndHPAMode() | ||
| } | ||
|
|
||
| func (g *gardenerAPIServer) horizontalPodAutoscalerInVPAAndHPAMode() *autoscalingv2.HorizontalPodAutoscaler { | ||
| // The chosen value is 6 CPU: 1 CPU less than the VPA's maxAllowed 7 CPU in VPAAndHPA mode to have a headroom for the horizontal scaling. | ||
| hpaTargetAverageValueCPU := resource.MustParse("6") | ||
| // The chosen value is 24G: 4G less than the VPA's maxAllowed 28G in VPAAndHPA mode to have a headroom for the horizontal scaling. | ||
| hpaTargetAverageValueMemory := resource.MustParse("24G") | ||
|
|
||
| return &autoscalingv2.HorizontalPodAutoscaler{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: DeploymentName, | ||
| Namespace: g.namespace, | ||
| Labels: utils.MergeStringMaps(GetLabels(), map[string]string{resourcesv1alpha1.HighAvailabilityConfigType: resourcesv1alpha1.HighAvailabilityConfigTypeServer}), | ||
| }, | ||
| Spec: autoscalingv2.HorizontalPodAutoscalerSpec{ | ||
| MinReplicas: ptr.To[int32](2), | ||
| MaxReplicas: 4, | ||
| ScaleTargetRef: autoscalingv2.CrossVersionObjectReference{ | ||
| APIVersion: appsv1.SchemeGroupVersion.String(), | ||
| Kind: "Deployment", | ||
| Name: DeploymentName, | ||
| }, | ||
| Metrics: []autoscalingv2.MetricSpec{ | ||
| { | ||
| Type: autoscalingv2.ResourceMetricSourceType, | ||
| Resource: &autoscalingv2.ResourceMetricSource{ | ||
| Name: corev1.ResourceCPU, | ||
| Target: autoscalingv2.MetricTarget{ | ||
| Type: autoscalingv2.AverageValueMetricType, | ||
| AverageValue: &hpaTargetAverageValueCPU, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| Type: autoscalingv2.ResourceMetricSourceType, | ||
| Resource: &autoscalingv2.ResourceMetricSource{ | ||
| Name: corev1.ResourceMemory, | ||
| Target: autoscalingv2.MetricTarget{ | ||
| Type: autoscalingv2.AverageValueMetricType, | ||
| AverageValue: &hpaTargetAverageValueMemory, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| Behavior: &autoscalingv2.HorizontalPodAutoscalerBehavior{ | ||
| ScaleUp: &autoscalingv2.HPAScalingRules{ | ||
| StabilizationWindowSeconds: ptr.To[int32](60), | ||
| Policies: []autoscalingv2.HPAScalingPolicy{ | ||
| // Allow to upscale 100% of the current number of pods every 1 minute to see whether any upscale recommendation will still hold true after the cluster has settled | ||
| { | ||
| Type: autoscalingv2.PercentScalingPolicy, | ||
| Value: 100, | ||
| PeriodSeconds: 60, | ||
| }, | ||
| }, | ||
| }, | ||
| ScaleDown: &autoscalingv2.HPAScalingRules{ | ||
| StabilizationWindowSeconds: ptr.To[int32](1800), | ||
| Policies: []autoscalingv2.HPAScalingPolicy{ | ||
| // Allow to downscale one pod every 5 minutes to see whether any downscale recommendation will still hold true after the cluster has settled (conservatively) | ||
| { | ||
| Type: autoscalingv2.PodsScalingPolicy, | ||
| Value: 1, | ||
| PeriodSeconds: 300, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| } |
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