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horizontalpodautoscaler.go
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horizontalpodautoscaler.go
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// Copyright (c) 2021 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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.
package kubeapiserver
import (
"context"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/controllerutils"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
appsv1 "k8s.io/api/apps/v1"
autoscalingv2beta1 "k8s.io/api/autoscaling/v2beta1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/pointer"
)
const (
hpaTargetAverageUtilizationCPU int32 = 80
hpaTargetAverageUtilizationMemory int32 = 80
)
// TODO: Switch to autoscaling/v2 for v1.23+ clusters as soon as we have revendored the k8s.io/* libraries with
// v0.23.0 or above.
func (k *kubeAPIServer) emptyHorizontalPodAutoscaler() *autoscalingv2beta1.HorizontalPodAutoscaler {
return &autoscalingv2beta1.HorizontalPodAutoscaler{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer, Namespace: k.namespace}}
}
func (k *kubeAPIServer) reconcileHorizontalPodAutoscaler(ctx context.Context, horizontalPodAutoscaler *autoscalingv2beta1.HorizontalPodAutoscaler, deployment *appsv1.Deployment) error {
if k.values.Autoscaling.HVPAEnabled ||
k.values.Autoscaling.Replicas == nil ||
*k.values.Autoscaling.Replicas == 0 {
return kutil.DeleteObject(ctx, k.client.Client(), horizontalPodAutoscaler)
}
_, err := controllerutils.GetAndCreateOrMergePatch(ctx, k.client.Client(), horizontalPodAutoscaler, func() error {
horizontalPodAutoscaler.Spec = autoscalingv2beta1.HorizontalPodAutoscalerSpec{
MinReplicas: &k.values.Autoscaling.MinReplicas,
MaxReplicas: k.values.Autoscaling.MaxReplicas,
ScaleTargetRef: autoscalingv2beta1.CrossVersionObjectReference{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: deployment.Name,
},
Metrics: []autoscalingv2beta1.MetricSpec{
{
Type: autoscalingv2beta1.ResourceMetricSourceType,
Resource: &autoscalingv2beta1.ResourceMetricSource{
Name: corev1.ResourceCPU,
TargetAverageUtilization: pointer.Int32(hpaTargetAverageUtilizationCPU),
},
},
{
Type: autoscalingv2beta1.ResourceMetricSourceType,
Resource: &autoscalingv2beta1.ResourceMetricSource{
Name: corev1.ResourceMemory,
TargetAverageUtilization: pointer.Int32(hpaTargetAverageUtilizationMemory),
},
},
},
}
return nil
})
return err
}