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kubecontrollermanager.go
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kubecontrollermanager.go
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// Copyright (c) 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"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/operation/botanist/controlplane/kubecontrollermanager"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils/imagevector"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// DefaultKubeControllerManager returns a deployer for the kube-controller-manager.
func (b *Botanist) DefaultKubeControllerManager() (kubecontrollermanager.KubeControllerManager, error) {
image, err := b.ImageVector.FindImage(common.KubeControllerManagerImageName, imagevector.RuntimeVersion(b.SeedVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return nil, err
}
return kubecontrollermanager.New(
b.Logger.WithField("component", "kube-controller-manager"),
b.K8sSeedClient.Client(),
b.Shoot.SeedNamespace,
b.Shoot.KubernetesVersion,
image.String(),
b.Shoot.Info.Spec.Kubernetes.KubeControllerManager,
b.Shoot.Networks.Pods,
b.Shoot.Networks.Services,
), nil
}
// DeployKubeControllerManager deploys the Kubernetes Controller Manager.
func (b *Botanist) DeployKubeControllerManager(ctx context.Context) error {
replicaCount, err := b.determineKubeControllerManagerReplicas(ctx)
if err != nil {
return err
}
b.Shoot.Components.ControlPlane.KubeControllerManager.SetReplicaCount(replicaCount)
b.Shoot.Components.ControlPlane.KubeControllerManager.SetSecrets(kubecontrollermanager.Secrets{
CA: component.Secret{Name: v1beta1constants.SecretNameCACluster, Checksum: b.CheckSums[v1beta1constants.SecretNameCACluster]},
ServiceAccountKey: component.Secret{Name: v1beta1constants.SecretNameServiceAccountKey, Checksum: b.CheckSums[v1beta1constants.SecretNameServiceAccountKey]},
Kubeconfig: component.Secret{Name: kubecontrollermanager.SecretName, Checksum: b.CheckSums[kubecontrollermanager.SecretName]},
Server: component.Secret{Name: kubecontrollermanager.SecretNameServer, Checksum: b.CheckSums[kubecontrollermanager.SecretNameServer]},
})
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.K8sShootClient.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.K8sSeedClient.DirectClient(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeControllerManager), 1)
}
func (b *Botanist) determineKubeControllerManagerReplicas(ctx context.Context) (int32, error) {
if b.Shoot.Info.Status.LastOperation != nil && b.Shoot.Info.Status.LastOperation.Type == gardencorev1beta1.LastOperationTypeCreate {
if b.Shoot.HibernationEnabled {
// shoot is being created with .spec.hibernation.enabled=true, don't deploy KCM at all
return 0, nil
}
// shoot is being created with .spec.hibernation.enabled=false, deploy KCM
return 1, nil
}
if b.Shoot.HibernationEnabled == b.Shoot.Info.Status.IsHibernated {
// shoot is being reconciled with .spec.hibernation.enabled=.status.isHibernated, so keep the replicas which
// are controlled by the dependency-watchdog
return common.CurrentReplicaCount(ctx, b.K8sSeedClient.Client(), b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeControllerManager)
}
// shoot is being reconciled with .spec.hibernation.enabled!=.status.isHibernated, so deploy KCM. in case the
// shoot is being hibernated then it will be scaled down to zero later after all machines are gone
return 1, nil
}