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kubecontrollermanager.go
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kubecontrollermanager.go
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// Copyright 2020 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 botanist
import (
"context"
"net"
hvpav1alpha1 "github.com/gardener/hvpa-controller/api/v1alpha1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/component/kubecontrollermanager"
"github.com/gardener/gardener/pkg/component/shared"
"github.com/gardener/gardener/pkg/features"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// DefaultKubeControllerManager returns a deployer for the kube-controller-manager.
func (b *Botanist) DefaultKubeControllerManager() (kubecontrollermanager.Interface, error) {
hvpaEnabled := features.DefaultFeatureGate.Enabled(features.HVPA)
if b.ManagedSeed != nil {
hvpaEnabled = features.DefaultFeatureGate.Enabled(features.HVPAForShootedSeed)
}
scaleDownUpdateMode := hvpav1alpha1.UpdateModeAuto
if metav1.HasAnnotation(b.Shoot.GetInfo().ObjectMeta, v1beta1constants.ShootAlphaControlPlaneScaleDownDisabled) {
scaleDownUpdateMode = hvpav1alpha1.UpdateModeOff
}
var services, pods *net.IPNet
if b.Shoot.Networks != nil {
services = b.Shoot.Networks.Services
pods = b.Shoot.Networks.Pods
}
return shared.NewKubeControllerManager(
b.Logger,
b.SeedClientSet,
b.Shoot.SeedNamespace,
b.Seed.KubernetesVersion,
b.Shoot.KubernetesVersion,
b.SecretsManager,
"",
b.Shoot.GetInfo().Spec.Kubernetes.KubeControllerManager,
v1beta1constants.PriorityClassNameShootControlPlane300,
b.Shoot.IsWorkerless,
&kubecontrollermanager.HVPAConfig{
Enabled: hvpaEnabled,
ScaleDownUpdateMode: &scaleDownUpdateMode,
},
pods,
services,
nil,
kubecontrollermanager.ControllerWorkers{},
kubecontrollermanager.ControllerSyncPeriods{},
)
}
// DeployKubeControllerManager deploys the Kubernetes Controller Manager.
func (b *Botanist) DeployKubeControllerManager(ctx context.Context) error {
replicaCount, err := b.determineControllerReplicas(ctx, v1beta1constants.DeploymentNameKubeControllerManager, 1, true)
if err != nil {
return err
}
b.Shoot.Components.ControlPlane.KubeControllerManager.SetReplicaCount(replicaCount)
b.Shoot.Components.ControlPlane.KubeControllerManager.SetRuntimeConfig(b.Shoot.Components.ControlPlane.KubeAPIServer.GetValues().RuntimeConfig)
return b.Shoot.Components.ControlPlane.KubeControllerManager.Deploy(ctx)
}
// WaitForKubeControllerManagerToBeActive waits for the kube controller manager of a Shoot cluster has acquired leader election, thus is active.
func (b *Botanist) WaitForKubeControllerManagerToBeActive(ctx context.Context) error {
b.Shoot.Components.ControlPlane.KubeControllerManager.SetShootClient(b.ShootClientSet.Client())
return b.Shoot.Components.ControlPlane.KubeControllerManager.WaitForControllerToBeActive(ctx)
}
// ScaleKubeControllerManagerToOne scales kube-controller-manager replicas to one.
func (b *Botanist) ScaleKubeControllerManagerToOne(ctx context.Context) error {
return kubernetes.ScaleDeployment(ctx, b.SeedClientSet.Client(), kubernetesutils.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeControllerManager), 1)
}