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controlplane.go
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controlplane.go
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// Copyright (c) 2018 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"
"fmt"
"hash/crc32"
"path/filepath"
"strconv"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/features"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/operation/botanist/controlplane"
"github.com/gardener/gardener/pkg/operation/botanist/controlplane/clusterautoscaler"
"github.com/gardener/gardener/pkg/operation/botanist/controlplane/kubecontrollermanager"
"github.com/gardener/gardener/pkg/operation/botanist/controlplane/kubescheduler"
"github.com/gardener/gardener/pkg/operation/botanist/extensions/dns"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/imagevector"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/retry"
"github.com/gardener/gardener/pkg/utils/version"
druidv1alpha1 "github.com/gardener/etcd-druid/api/v1alpha1"
hvpav1alpha1 "github.com/gardener/hvpa-controller/api/v1alpha1"
"github.com/sirupsen/logrus"
appsv1 "k8s.io/api/apps/v1"
autoscalingv2beta1 "k8s.io/api/autoscaling/v2beta1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
audit_internal "k8s.io/apiserver/pkg/apis/audit"
auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
auditv1alpha1 "k8s.io/apiserver/pkg/apis/audit/v1alpha1"
auditv1beta1 "k8s.io/apiserver/pkg/apis/audit/v1beta1"
auditvalidation "k8s.io/apiserver/pkg/apis/audit/validation"
autoscalingv1beta2 "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/apis/autoscaling.k8s.io/v1beta2"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
var chartPathControlPlane = filepath.Join(common.ChartPath, "seed-controlplane", "charts")
// DeployNamespace creates a namespace in the Seed cluster which is used to deploy all the control plane
// components for the Shoot cluster. Moreover, the cloud provider configuration and all the secrets will be
// stored as ConfigMaps/Secrets.
func (b *Botanist) DeployNamespace(ctx context.Context) error {
namespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: b.Shoot.SeedNamespace,
},
}
if _, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), namespace, func() error {
namespace.Annotations = map[string]string{
v1beta1constants.DeprecatedShootUID: string(b.Shoot.Info.Status.UID),
}
namespace.Labels = map[string]string{
v1beta1constants.DeprecatedGardenRole: v1beta1constants.GardenRoleShoot,
v1beta1constants.GardenRole: v1beta1constants.GardenRoleShoot,
v1beta1constants.LabelSeedProvider: string(b.Seed.Info.Spec.Provider.Type),
v1beta1constants.LabelShootProvider: string(b.Shoot.Info.Spec.Provider.Type),
v1beta1constants.LabelNetworkingProvider: string(b.Shoot.Info.Spec.Networking.Type),
v1beta1constants.LabelBackupProvider: string(b.Seed.Info.Spec.Provider.Type),
}
if b.Seed.Info.Spec.Backup != nil {
namespace.Labels[v1beta1constants.LabelBackupProvider] = string(b.Seed.Info.Spec.Backup.Provider)
}
return nil
}); err != nil {
return err
}
b.SeedNamespaceObject = namespace
return nil
}
// DeleteNamespace deletes the namespace in the Seed cluster which holds the control plane components. The built-in
// garbage collection in Kubernetes will automatically delete all resources which belong to this namespace. This
// comprises volumes and load balancers as well.
func (b *Botanist) DeleteNamespace(ctx context.Context) error {
return b.deleteNamespace(ctx, b.Shoot.SeedNamespace)
}
func (b *Botanist) deleteNamespace(ctx context.Context, name string) error {
namespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: name,
},
}
err := b.K8sSeedClient.Client().Delete(ctx, namespace, kubernetes.DefaultDeleteOptions...)
if apierrors.IsNotFound(err) || apierrors.IsConflict(err) {
return nil
}
return err
}
// EnsureClusterIdentity ensures that Shoot cluster-identity ConfigMap exists and stores its data
// in the operation. Updates shoot.status.clusterIdentity if it doesn't exist already.
func (b *Botanist) EnsureClusterIdentity(ctx context.Context) error {
if err := b.Shoot.Components.ClusterIdentity.Deploy(ctx); err != nil {
return err
}
latestShoot := &gardencorev1beta1.Shoot{}
if err := b.K8sGardenClient.DirectClient().Get(ctx, kutil.Key(b.Shoot.Info.Namespace, b.Shoot.Info.Name), latestShoot); err != nil {
return err
}
b.Shoot.Info = latestShoot
return nil
}
// DeleteKubeAPIServer deletes the kube-apiserver deployment in the Seed cluster which holds the Shoot's control plane.
func (b *Botanist) DeleteKubeAPIServer(ctx context.Context) error {
// invalidate shoot client here before deleting API server
if err := b.ClientMap.InvalidateClient(keys.ForShoot(b.Shoot.Info)); err != nil {
return err
}
b.K8sShootClient = nil
deploy := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.DeploymentNameKubeAPIServer,
Namespace: b.Shoot.SeedNamespace,
},
}
return client.IgnoreNotFound(b.K8sSeedClient.Client().Delete(ctx, deploy, kubernetes.DefaultDeleteOptions...))
}
// DefaultClusterAutoscaler returns a deployer for the cluster-autoscaler.
func (b *Botanist) DefaultClusterAutoscaler() (clusterautoscaler.ClusterAutoscaler, error) {
image, err := b.ImageVector.FindImage(common.ClusterAutoscalerImageName, imagevector.RuntimeVersion(b.SeedVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return nil, err
}
return clusterautoscaler.New(
b.K8sSeedClient.Client(),
b.Shoot.SeedNamespace,
image.String(),
b.Shoot.GetReplicas(1),
b.Shoot.Info.Spec.Kubernetes.ClusterAutoscaler,
), nil
}
// DeployClusterAutoscaler deploys the Kubernetes cluster-autoscaler.
func (b *Botanist) DeployClusterAutoscaler(ctx context.Context) error {
if b.Shoot.WantsClusterAutoscaler {
b.Shoot.Components.ControlPlane.ClusterAutoscaler.SetSecrets(clusterautoscaler.Secrets{
Kubeconfig: component.Secret{Name: clusterautoscaler.SecretName, Checksum: b.CheckSums[clusterautoscaler.SecretName]},
})
b.Shoot.Components.ControlPlane.ClusterAutoscaler.SetNamespaceUID(b.SeedNamespaceObject.UID)
b.Shoot.Components.ControlPlane.ClusterAutoscaler.SetMachineDeployments(b.Shoot.MachineDeployments)
return b.Shoot.Components.ControlPlane.ClusterAutoscaler.Deploy(ctx)
}
return b.Shoot.Components.ControlPlane.ClusterAutoscaler.Destroy(ctx)
}
// DeployVerticalPodAutoscaler deploys the VPA into the shoot namespace in the seed.
func (b *Botanist) DeployVerticalPodAutoscaler(ctx context.Context) error {
if !b.Shoot.WantsVerticalPodAutoscaler {
return common.DeleteVpa(ctx, b.K8sSeedClient.Client(), b.Shoot.SeedNamespace, true)
}
var (
podLabels = map[string]interface{}{
v1beta1constants.LabelNetworkPolicyToDNS: "allowed",
v1beta1constants.LabelNetworkPolicyToShootAPIServer: "allowed",
}
admissionController = map[string]interface{}{
"replicas": b.Shoot.GetReplicas(1),
"podAnnotations": map[string]interface{}{
"checksum/secret-vpa-tls-certs": b.CheckSums[common.VPASecretName],
"checksum/secret-vpa-admission-controller": b.CheckSums["vpa-admission-controller"],
},
"podLabels": utils.MergeMaps(podLabels, map[string]interface{}{
v1beta1constants.LabelNetworkPolicyFromShootAPIServer: "allowed",
}),
"enableServiceAccount": false,
}
exporter = map[string]interface{}{
"enabled": false,
"replicas": 0,
}
recommender = map[string]interface{}{
"replicas": b.Shoot.GetReplicas(1),
"podAnnotations": map[string]interface{}{
"checksum/secret-vpa-recommender": b.CheckSums["vpa-recommender"],
},
"podLabels": podLabels,
"enableServiceAccount": false,
"recommendationMarginFraction": gardencorev1beta1.DefaultRecommendationMarginFraction,
"interval": gardencorev1beta1.DefaultRecommenderInterval,
}
updater = map[string]interface{}{
"replicas": b.Shoot.GetReplicas(1),
"podAnnotations": map[string]interface{}{
"checksum/secret-vpa-updater": b.CheckSums["vpa-updater"],
},
"podLabels": podLabels,
"enableServiceAccount": false,
"evictAfterOOMThreshold": gardencorev1beta1.DefaultEvictAfterOOMThreshold,
"evictionRateBurst": gardencorev1beta1.DefaultEvictionRateBurst,
"evictionRateLimit": gardencorev1beta1.DefaultEvictionRateLimit,
"evictionTolerance": gardencorev1beta1.DefaultEvictionTolerance,
"interval": gardencorev1beta1.DefaultUpdaterInterval,
}
defaultValues = map[string]interface{}{
"admissionController": admissionController,
"exporter": exporter,
"recommender": recommender,
"updater": updater,
"deploymentLabels": map[string]interface{}{
v1beta1constants.GardenRole: v1beta1constants.GardenRoleControlPlane,
v1beta1constants.DeprecatedGardenRole: v1beta1constants.GardenRoleControlPlane,
},
"clusterType": "shoot",
}
)
if verticalPodAutoscaler := b.Shoot.Info.Spec.Kubernetes.VerticalPodAutoscaler; verticalPodAutoscaler != nil {
if val := verticalPodAutoscaler.EvictAfterOOMThreshold; val != nil {
updater["evictAfterOOMThreshold"] = *val
}
if val := verticalPodAutoscaler.EvictionRateBurst; val != nil {
updater["evictionRateBurst"] = *val
}
if val := verticalPodAutoscaler.EvictionRateLimit; val != nil {
updater["evictionRateLimit"] = *val
}
if val := verticalPodAutoscaler.EvictionTolerance; val != nil {
updater["evictionTolerance"] = *val
}
if val := verticalPodAutoscaler.UpdaterInterval; val != nil {
updater["interval"] = *val
}
if val := verticalPodAutoscaler.RecommendationMarginFraction; val != nil {
recommender["recommendationMarginFraction"] = *val
}
if val := verticalPodAutoscaler.RecommenderInterval; val != nil {
recommender["interval"] = *val
}
}
values, err := b.InjectSeedShootImages(defaultValues, common.VpaAdmissionControllerImageName, common.VpaExporterImageName, common.VpaRecommenderImageName, common.VpaUpdaterImageName)
if err != nil {
return err
}
values["global"] = map[string]interface{}{"images": values["images"]}
return b.K8sSeedClient.ChartApplier().Apply(ctx, filepath.Join(common.ChartPath, "seed-bootstrap", "charts", "vpa", "charts", "runtime"), b.Shoot.SeedNamespace, "vpa", kubernetes.Values(values))
}
// DeleteClusterAutoscaler deletes the cluster-autoscaler deployment in the Seed cluster which holds the Shoot's control plane.
func (b *Botanist) DeleteClusterAutoscaler(ctx context.Context) error {
deploy := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.DeploymentNameClusterAutoscaler,
Namespace: b.Shoot.SeedNamespace,
},
}
return client.IgnoreNotFound(b.K8sSeedClient.Client().Delete(ctx, deploy, kubernetes.DefaultDeleteOptions...))
}
// WakeUpKubeAPIServer creates a service and ensures API Server is scaled up
func (b *Botanist) WakeUpKubeAPIServer(ctx context.Context) error {
sniPhase := b.Shoot.Components.ControlPlane.KubeAPIServerSNIPhase.Done()
if err := b.DeployKubeAPIService(ctx, sniPhase); err != nil {
return err
}
if err := b.Shoot.Components.ControlPlane.KubeAPIServerService.Wait(ctx); err != nil {
return err
}
if b.APIServerSNIEnabled() {
if err := b.DeployKubeAPIServerSNI(ctx); err != nil {
return err
}
}
if err := b.DeployKubeAPIServer(ctx); err != nil {
return err
}
if err := kubernetes.ScaleDeployment(ctx, b.K8sSeedClient.Client(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1); err != nil {
return err
}
if err := b.WaitUntilKubeAPIServerReady(ctx); err != nil {
return err
}
return nil
}
// HibernateControlPlane hibernates the entire control plane if the shoot shall be hibernated.
func (b *Botanist) HibernateControlPlane(ctx context.Context) error {
if b.K8sShootClient != nil {
ctxWithTimeOut, cancel := context.WithTimeout(ctx, 10*time.Minute)
defer cancel()
// If a shoot is hibernated we only want to scale down the entire control plane if no nodes exist anymore. The node-lifecycle-controller
// inside KCM is responsible for deleting Node objects of terminated/non-existing VMs, so let's wait for that before scaling down.
if err := b.WaitUntilNodesDeleted(ctxWithTimeOut); err != nil {
return err
}
// Also wait for all Pods to reflect the correct state before scaling down the control plane.
// KCM should remove all Pods in the cluster that are bound to Nodes that no longer exist and
// therefore there should be no Pods with state `Running` anymore.
if err := b.WaitUntilNoPodRunning(ctxWithTimeOut); err != nil {
return err
}
// Also wait for all Endpoints to not contain any IPs from the Shoot's PodCIDR.
// This is to make sure that the Endpoints objects also reflect the correct state of the hibernated cluster.
// Otherwise this could cause timeouts in user-defined webhooks for CREATE Pods or Nodes on wakeup.
if err := b.WaitUntilEndpointsDoNotContainPodIPs(ctxWithTimeOut); err != nil {
return err
}
// TODO: remove this mitigation once there is a garbage collection for VolumeAttachments (ref https://github.com/kubernetes/kubernetes/issues/77324)
// Currently on hibernation Machines are forecefully deleted and machine-controller-manager does not wait volumes to be detached.
// In this case kube-controller-manager cannot delete the corresponding VolumeAttachment objects and they are orphaned.
// Such orphaned VolumeAttachments then prevent/block PV deletion. For more details see https://github.com/gardener/gardener-extension-provider-gcp/issues/172.
// As the Nodes are already deleted, we can delete all VolumeAttachments.
if err := DeleteVolumeAttachments(ctxWithTimeOut, b.K8sShootClient.Client()); err != nil {
return err
}
if err := WaitUntilVolumeAttachmentsDeleted(ctxWithTimeOut, b.K8sShootClient.Client(), b.Logger); err != nil {
return err
}
}
// invalidate shoot client here before scaling down API server
if err := b.ClientMap.InvalidateClient(keys.ForShoot(b.Shoot.Info)); err != nil {
return err
}
b.K8sShootClient = nil
// use direct client here, as cached client sometimes causes scale functions not to work properly
// e.g. Deployments not scaled down/up
c := b.K8sSeedClient.DirectClient()
deployments := []string{
v1beta1constants.DeploymentNameGardenerResourceManager,
v1beta1constants.DeploymentNameKubeControllerManager,
v1beta1constants.DeploymentNameKubeAPIServer,
}
for _, deployment := range deployments {
if err := kubernetes.ScaleDeployment(ctx, c, kutil.Key(b.Shoot.SeedNamespace, deployment), 0); client.IgnoreNotFound(err) != nil {
return err
}
}
if err := c.Delete(ctx, &hvpav1alpha1.Hvpa{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer, Namespace: b.Shoot.SeedNamespace}}, kubernetes.DefaultDeleteOptions...); err != nil {
if !apierrors.IsNotFound(err) && !meta.IsNoMatchError(err) {
return err
}
}
if !b.Shoot.DisableDNS && !b.APIServerSNIEnabled() {
if err := b.Shoot.Components.ControlPlane.KubeAPIServerService.Destroy(ctx); err != nil {
return err
}
}
if err := b.Shoot.Components.ControlPlane.KubeAPIServerSNI.Destroy(ctx); err != nil {
return err
}
return client.IgnoreNotFound(b.ScaleETCDToZero(ctx))
}
// ScaleETCDToZero scales ETCD main and events to zero
func (b *Botanist) ScaleETCDToZero(ctx context.Context) error {
for _, etcd := range []string{v1beta1constants.ETCDEvents, v1beta1constants.ETCDMain} {
if err := kubernetes.ScaleEtcd(ctx, b.K8sSeedClient.DirectClient(), kutil.Key(b.Shoot.SeedNamespace, etcd), 0); client.IgnoreNotFound(err) != nil {
return err
}
}
return nil
}
// ScaleETCDToOne scales ETCD main and events replicas to one
func (b *Botanist) ScaleETCDToOne(ctx context.Context) error {
for _, etcd := range []string{v1beta1constants.ETCDEvents, v1beta1constants.ETCDMain} {
if err := kubernetes.ScaleEtcd(ctx, b.K8sSeedClient.DirectClient(), kutil.Key(b.Shoot.SeedNamespace, etcd), 1); err != nil {
return err
}
}
return nil
}
// ScaleKubeAPIServerToOne scales kube-apiserver replicas to one
func (b *Botanist) ScaleKubeAPIServerToOne(ctx context.Context) error {
return kubernetes.ScaleDeployment(ctx, b.K8sSeedClient.DirectClient(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1)
}
// 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)
}
// ScaleGardenerResourceManagerToOne scales the gardener-resource-manager deployment
func (b *Botanist) ScaleGardenerResourceManagerToOne(ctx context.Context) error {
return kubernetes.ScaleDeployment(ctx, b.K8sSeedClient.DirectClient(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameGardenerResourceManager), 1)
}
// PrepareKubeAPIServerForMigration deletes the kube-apiserver and deletes its hvpa
func (b *Botanist) PrepareKubeAPIServerForMigration(ctx context.Context) error {
if err := b.K8sSeedClient.Client().Delete(ctx, &hvpav1alpha1.Hvpa{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer, Namespace: b.Shoot.SeedNamespace}}); client.IgnoreNotFound(err) != nil && !meta.IsNoMatchError(err) {
return err
}
return b.DeleteKubeAPIServer(ctx)
}
// ControlPlaneDefaultTimeout is the default timeout and defines how long Gardener should wait
// for a successful reconciliation of a control plane resource.
const ControlPlaneDefaultTimeout = 3 * time.Minute
// DeployControlPlane creates the `ControlPlane` extension resource in the shoot namespace in the seed
// cluster. Gardener waits until an external controller did reconcile the cluster successfully.
func (b *Botanist) DeployControlPlane(ctx context.Context) error {
var (
restorePhase = b.isRestorePhase()
gardenerOperation = v1beta1constants.GardenerOperationReconcile
cp = &extensionsv1alpha1.ControlPlane{
ObjectMeta: metav1.ObjectMeta{
Name: b.Shoot.Info.Name,
Namespace: b.Shoot.SeedNamespace,
},
}
providerConfig *runtime.RawExtension
)
if cfg := b.Shoot.Info.Spec.Provider.ControlPlaneConfig; cfg != nil {
providerConfig = &runtime.RawExtension{
Raw: cfg.Raw,
}
}
if restorePhase {
gardenerOperation = v1beta1constants.GardenerOperationWaitForState
}
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), cp, func() error {
metav1.SetMetaDataAnnotation(&cp.ObjectMeta, v1beta1constants.GardenerOperation, gardenerOperation)
metav1.SetMetaDataAnnotation(&cp.ObjectMeta, v1beta1constants.GardenerTimestamp, time.Now().UTC().String())
cp.Spec = extensionsv1alpha1.ControlPlaneSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: string(b.Shoot.Info.Spec.Provider.Type),
ProviderConfig: providerConfig,
},
Region: b.Shoot.Info.Spec.Region,
SecretRef: corev1.SecretReference{
Name: v1beta1constants.SecretNameCloudProvider,
Namespace: cp.Namespace,
},
InfrastructureProviderStatus: &runtime.RawExtension{
Raw: b.Shoot.InfrastructureStatus,
},
}
return nil
})
if err != nil {
return err
}
if restorePhase {
return b.restoreExtensionObject(ctx, cp, extensionsv1alpha1.ControlPlaneResource)
}
return nil
}
const controlPlaneExposureSuffix = "-exposure"
// DeployControlPlaneExposure creates the `ControlPlane` extension resource with purpose `exposure` in the shoot
// namespace in the seed cluster. Gardener waits until an external controller did reconcile the cluster successfully.
func (b *Botanist) DeployControlPlaneExposure(ctx context.Context) error {
var (
restorePhase = b.isRestorePhase()
gardenerOperation = v1beta1constants.GardenerOperationReconcile
cp = &extensionsv1alpha1.ControlPlane{
ObjectMeta: metav1.ObjectMeta{
Name: b.Shoot.Info.Name + controlPlaneExposureSuffix,
Namespace: b.Shoot.SeedNamespace,
},
}
)
purpose := new(extensionsv1alpha1.Purpose)
*purpose = extensionsv1alpha1.Exposure
if restorePhase {
gardenerOperation = v1beta1constants.GardenerOperationWaitForState
}
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), cp, func() error {
metav1.SetMetaDataAnnotation(&cp.ObjectMeta, v1beta1constants.GardenerOperation, gardenerOperation)
metav1.SetMetaDataAnnotation(&cp.ObjectMeta, v1beta1constants.GardenerTimestamp, time.Now().UTC().String())
cp.Spec = extensionsv1alpha1.ControlPlaneSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: b.Seed.Info.Spec.Provider.Type,
},
Region: b.Seed.Info.Spec.Provider.Region,
Purpose: purpose,
SecretRef: corev1.SecretReference{
Name: v1beta1constants.SecretNameCloudProvider,
Namespace: cp.Namespace,
},
}
return nil
})
if err != nil {
return err
}
if restorePhase {
return b.restoreExtensionObject(ctx, cp, extensionsv1alpha1.ControlPlaneResource)
}
return nil
}
// DestroyControlPlane deletes the `ControlPlane` extension resource in the shoot namespace in the seed cluster,
// and it waits for a maximum of 10m until it is deleted.
func (b *Botanist) DestroyControlPlane(ctx context.Context) error {
return b.destroyControlPlane(ctx, b.Shoot.Info.Name)
}
// DestroyControlPlaneExposure deletes the `ControlPlane` extension resource with purpose `exposure`
// in the shoot namespace in the seed cluster, and it waits for a maximum of 10m until it is deleted.
func (b *Botanist) DestroyControlPlaneExposure(ctx context.Context) error {
return b.destroyControlPlane(ctx, b.Shoot.Info.Name+controlPlaneExposureSuffix)
}
// destroyControlPlane deletes the `ControlPlane` extension resource with the following name in the shoot namespace
// in the seed cluster, and it waits for a maximum of 10m until it is deleted.
func (b *Botanist) destroyControlPlane(ctx context.Context, name string) error {
return common.DeleteExtensionCR(
ctx,
b.K8sSeedClient.Client(),
func() extensionsv1alpha1.Object { return &extensionsv1alpha1.ControlPlane{} },
b.Shoot.SeedNamespace,
name,
)
}
// WaitUntilControlPlaneExposureReady waits until the control plane resource with purpose `exposure` has been reconciled successfully.
func (b *Botanist) WaitUntilControlPlaneExposureReady(ctx context.Context) error {
return b.waitUntilControlPlaneReady(ctx, b.Shoot.Info.Name+controlPlaneExposureSuffix)
}
// WaitUntilControlPlaneReady waits until the control plane resource has been reconciled successfully.
func (b *Botanist) WaitUntilControlPlaneReady(ctx context.Context) error {
return b.waitUntilControlPlaneReady(ctx, b.Shoot.Info.Name)
}
// waitUntilControlPlaneReady waits until the control plane resource has been reconciled successfully.
func (b *Botanist) waitUntilControlPlaneReady(ctx context.Context, name string) error {
return common.WaitUntilExtensionCRReady(
ctx,
b.K8sSeedClient.DirectClient(),
b.Logger,
func() runtime.Object { return &extensionsv1alpha1.ControlPlane{} },
"ControlPlane",
b.Shoot.SeedNamespace,
name,
DefaultInterval,
DefaultSevereThreshold,
ControlPlaneDefaultTimeout,
func(o runtime.Object) error {
obj, ok := o.(extensionsv1alpha1.Object)
if !ok {
return fmt.Errorf("expected extensionsv1alpha1.Object but got %T", o)
}
if providerStatus := obj.GetExtensionStatus().GetProviderStatus(); providerStatus != nil {
b.Shoot.ControlPlaneStatus = providerStatus.Raw
}
return nil
},
)
}
// WaitUntilControlPlaneExposureDeleted waits until the control plane resource with purpose `exposure` has been deleted.
func (b *Botanist) WaitUntilControlPlaneExposureDeleted(ctx context.Context) error {
return b.waitUntilControlPlaneDeleted(ctx, b.Shoot.Info.Name+controlPlaneExposureSuffix)
}
// WaitUntilControlPlaneDeleted waits until the control plane resource has been deleted.
func (b *Botanist) WaitUntilControlPlaneDeleted(ctx context.Context) error {
return b.waitUntilControlPlaneDeleted(ctx, b.Shoot.Info.Name)
}
// waitUntilControlPlaneDeleted waits until the control plane resource with the following name has been deleted.
func (b *Botanist) waitUntilControlPlaneDeleted(ctx context.Context, name string) error {
return common.WaitUntilExtensionCRDeleted(
ctx,
b.K8sSeedClient.DirectClient(),
b.Logger,
func() extensionsv1alpha1.Object { return &extensionsv1alpha1.ControlPlane{} },
"ControlPlane",
b.Shoot.SeedNamespace,
name,
DefaultInterval,
ControlPlaneDefaultTimeout,
)
}
// DeployGardenerResourceManager deploys the gardener-resource-manager which will use CRD resources in order
// to ensure that they exist in a cluster/reconcile them in case somebody changed something.
func (b *Botanist) DeployGardenerResourceManager(ctx context.Context) error {
var name = "gardener-resource-manager"
defaultValues := map[string]interface{}{
"podAnnotations": map[string]interface{}{
"checksum/secret-" + name: b.CheckSums[name],
},
"replicas": b.Shoot.GetReplicas(1),
// We run one GRM per shoot control plane, and the GRM is doing its leader election via configmaps in the seed -
// by default every 2s. This can lead to a lot of PUT /v1/configmaps requests on the API server, and given that
// a seed is very busy anyways, we should not unnecessarily stress the API server with this leader election.
// The GRM's sync period is 1m anyways, so it doesn't matter too much if the leadership determination may take up
// to one minute.
"leaderElection": map[string]interface{}{
"leaseDuration": "40s",
"renewDeadline": "15s",
"retryPeriod": "10s",
},
}
values, err := b.InjectSeedShootImages(defaultValues, common.GardenerResourceManagerImageName)
if err != nil {
return err
}
return b.K8sSeedClient.ChartApplier().Apply(ctx, filepath.Join(common.ChartPath, "seed-controlplane", "charts", name), b.Shoot.SeedNamespace, name, kubernetes.Values(values))
}
// DeployBackupEntryInGarden deploys the BackupEntry resource in garden.
func (b *Botanist) DeployBackupEntryInGarden(ctx context.Context) error {
var (
name = common.GenerateBackupEntryName(b.Shoot.Info.Status.TechnicalID, b.Shoot.Info.Status.UID)
backupEntry = &gardencorev1beta1.BackupEntry{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: b.Shoot.Info.Namespace,
},
}
bucketName string
seedName *string
)
if err := b.K8sGardenClient.Client().Get(ctx, kutil.Key(b.Shoot.Info.Namespace, name), backupEntry); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
// If backupEntry doesn't already exists, we have to assign backupBucket to backupEntry.
bucketName = string(b.Seed.Info.UID)
seedName = &b.Seed.Info.Name
} else if b.isRestorePhase() {
bucketName = backupEntry.Spec.BucketName
seedName = &b.Seed.Info.Name
} else {
bucketName = backupEntry.Spec.BucketName
seedName = backupEntry.Spec.SeedName
}
ownerRef := metav1.NewControllerRef(b.Shoot.Info, gardencorev1beta1.SchemeGroupVersion.WithKind("Shoot"))
blockOwnerDeletion := false
ownerRef.BlockOwnerDeletion = &blockOwnerDeletion
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sGardenClient.Client(), backupEntry, func() error {
metav1.SetMetaDataAnnotation(&backupEntry.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile)
metav1.SetMetaDataAnnotation(&backupEntry.ObjectMeta, v1beta1constants.GardenerTimestamp, time.Now().UTC().String())
finalizers := sets.NewString(backupEntry.GetFinalizers()...)
finalizers.Insert(gardencorev1beta1.GardenerName)
backupEntry.SetFinalizers(finalizers.UnsortedList())
backupEntry.ObjectMeta.OwnerReferences = []metav1.OwnerReference{*ownerRef}
backupEntry.Spec.BucketName = bucketName
backupEntry.Spec.SeedName = seedName
return nil
})
return err
}
const (
auditPolicyConfigMapDataKey = "policy"
)
var (
runtimeScheme = runtime.NewScheme()
codecs = serializer.NewCodecFactory(runtimeScheme)
decoder = codecs.UniversalDecoder()
)
func init() {
_ = auditv1alpha1.AddToScheme(runtimeScheme)
_ = auditv1beta1.AddToScheme(runtimeScheme)
_ = auditv1.AddToScheme(runtimeScheme)
_ = audit_internal.AddToScheme(runtimeScheme)
}
// getResourcesForAPIServer returns the cpu and memory requirements for API server based on nodeCount
func getResourcesForAPIServer(nodeCount int32, scalingClass string) (string, string, string, string) {
var (
validScalingClasses = sets.NewString("small", "medium", "large", "xlarge", "2xlarge")
cpuRequest string
memoryRequest string
cpuLimit string
memoryLimit string
)
if !validScalingClasses.Has(scalingClass) {
switch {
case nodeCount <= 2:
scalingClass = "small"
case nodeCount <= 10:
scalingClass = "medium"
case nodeCount <= 50:
scalingClass = "large"
case nodeCount <= 100:
scalingClass = "xlarge"
default:
scalingClass = "2xlarge"
}
}
switch {
case scalingClass == "small":
cpuRequest = "800m"
memoryRequest = "800Mi"
cpuLimit = "1000m"
memoryLimit = "1200Mi"
case scalingClass == "medium":
cpuRequest = "1000m"
memoryRequest = "1100Mi"
cpuLimit = "1200m"
memoryLimit = "1900Mi"
case scalingClass == "large":
cpuRequest = "1200m"
memoryRequest = "1600Mi"
cpuLimit = "1500m"
memoryLimit = "3900Mi"
case scalingClass == "xlarge":
cpuRequest = "2500m"
memoryRequest = "5200Mi"
cpuLimit = "3000m"
memoryLimit = "5900Mi"
case scalingClass == "2xlarge":
cpuRequest = "3000m"
memoryRequest = "5200Mi"
cpuLimit = "4000m"
memoryLimit = "7800Mi"
}
return cpuRequest, memoryRequest, cpuLimit, memoryLimit
}
func (b *Botanist) deployNetworkPolicies(ctx context.Context, denyAll bool) error {
var (
globalNetworkPoliciesValues = map[string]interface{}{
"blockedAddresses": b.Seed.Info.Spec.Networks.BlockCIDRs,
"denyAll": denyAll,
}
excludeNets = []string{}
values = map[string]interface{}{}
)
switch b.Shoot.Components.ControlPlane.KubeAPIServerSNIPhase { //nolint:exhaustive
case component.PhaseEnabled, component.PhaseEnabling, component.PhaseDisabling:
// Enable network policies for SNI
// When disabling SNI (previously enabled), the control plane is transitioning between states, thus
// it needs to be ensured that the traffic from old clients can still reach the API server.
globalNetworkPoliciesValues["sniEnabled"] = true
default:
globalNetworkPoliciesValues["sniEnabled"] = false
}
excludeNets = append(excludeNets, b.Seed.Info.Spec.Networks.BlockCIDRs...)
var shootCIDRNetworks []string
if v := b.Shoot.GetNodeNetwork(); v != nil {
shootCIDRNetworks = append(shootCIDRNetworks, *v)
}
if v := b.Shoot.Info.Spec.Networking.Pods; v != nil {
shootCIDRNetworks = append(shootCIDRNetworks, *v)
}
if v := b.Shoot.Info.Spec.Networking.Services; v != nil {
shootCIDRNetworks = append(shootCIDRNetworks, *v)
}
shootNetworkValues, err := common.ExceptNetworks(shootCIDRNetworks, excludeNets...)
if err != nil {
return err
}
values["clusterNetworks"] = shootNetworkValues
allCIDRNetworks := []string{b.Seed.Info.Spec.Networks.Pods, b.Seed.Info.Spec.Networks.Services}
if v := b.Seed.Info.Spec.Networks.Nodes; v != nil {
allCIDRNetworks = append(allCIDRNetworks, *v)
}
allCIDRNetworks = append(allCIDRNetworks, shootCIDRNetworks...)
allCIDRNetworks = append(allCIDRNetworks, excludeNets...)
privateNetworks, err := common.ToExceptNetworks(common.AllPrivateNetworkBlocks(), allCIDRNetworks...)
if err != nil {
return err
}
globalNetworkPoliciesValues["privateNetworks"] = privateNetworks
values["global-network-policies"] = globalNetworkPoliciesValues
return b.K8sSeedClient.ChartApplier().Apply(ctx, filepath.Join(chartPathControlPlane, "network-policies"), b.Shoot.SeedNamespace, "network-policies", kubernetes.Values(values))
}
// DeployNetworkPolicies creates a network policies in a Shoot cluster's namespace that
// deny all traffic and allow certain components to use annotations to declare their desire
// to transmit/receive traffic to/from other Pods/IP addresses.
func (b *Botanist) DeployNetworkPolicies(ctx context.Context) error {
return b.deployNetworkPolicies(ctx, true)
}
// DeployKubeAPIServer deploys kube-apiserver deployment.
func (b *Botanist) DeployKubeAPIServer(ctx context.Context) error {
var (
hvpaEnabled = gardenletfeatures.FeatureGate.Enabled(features.HVPA)
mountHostCADirectories = gardenletfeatures.FeatureGate.Enabled(features.MountHostCADirectories)
memoryMetricForHpaEnabled = false
)
if b.ShootedSeed != nil {
// Override for shooted seeds
hvpaEnabled = gardenletfeatures.FeatureGate.Enabled(features.HVPAForShootedSeed)
memoryMetricForHpaEnabled = true
}
var (
podAnnotations = map[string]interface{}{
"checksum/secret-ca": b.CheckSums[v1beta1constants.SecretNameCACluster],
"checksum/secret-ca-front-proxy": b.CheckSums[v1beta1constants.SecretNameCAFrontProxy],
"checksum/secret-kube-apiserver": b.CheckSums[v1beta1constants.DeploymentNameKubeAPIServer],
"checksum/secret-kube-aggregator": b.CheckSums["kube-aggregator"],
"checksum/secret-kube-apiserver-kubelet": b.CheckSums["kube-apiserver-kubelet"],
"checksum/secret-static-token": b.CheckSums[common.StaticTokenSecretName],
"checksum/secret-service-account-key": b.CheckSums["service-account-key"],
"checksum/secret-etcd-ca": b.CheckSums[v1beta1constants.SecretNameCAETCD],
"checksum/secret-etcd-client-tls": b.CheckSums["etcd-client-tls"],
"networkpolicy/konnectivity-enabled": strconv.FormatBool(b.Shoot.KonnectivityTunnelEnabled),
}
defaultValues = map[string]interface{}{
"etcdServicePort": 2379,
"kubernetesVersion": b.Shoot.Info.Spec.Kubernetes.Version,
"enableBasicAuthentication": gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info),
"probeCredentials": b.APIServerHealthCheckToken,
"securePort": 443,
"podAnnotations": podAnnotations,
"konnectivityTunnel": map[string]interface{}{
"enabled": b.Shoot.KonnectivityTunnelEnabled,
},
"hvpa": map[string]interface{}{
"enabled": hvpaEnabled,
},
"hpa": map[string]interface{}{
"memoryMetricForHpaEnabled": memoryMetricForHpaEnabled,
},
}
minReplicas int32 = 1
maxReplicas int32 = 4
shootNetworks = map[string]interface{}{
"services": b.Shoot.Networks.Services.String(),
"pods": b.Shoot.Networks.Pods.String(),
}
)
if b.Shoot.KonnectivityTunnelEnabled {
podAnnotations["checksum/secret-konnectivity-server"] = b.CheckSums["konnectivity-server"]
} else {
podAnnotations["checksum/secret-vpn-seed"] = b.CheckSums["vpn-seed"]
podAnnotations["checksum/secret-vpn-seed-tlsauth"] = b.CheckSums["vpn-seed-tlsauth"]
}
if v := b.Shoot.GetNodeNetwork(); v != nil {
shootNetworks["nodes"] = *v
}
defaultValues["shootNetworks"] = shootNetworks
if b.APIServerSNIEnabled() {
defaultValues["sni"] = map[string]interface{}{
"enabled": true,
"advertiseIP": b.APIServerClusterIP,
}
}
enableEtcdEncryption, err := version.CheckVersionMeetsConstraint(b.Shoot.Info.Spec.Kubernetes.Version, ">= 1.13")
if err != nil {
return err
}
if enableEtcdEncryption {
defaultValues["enableEtcdEncryption"] = true
defaultValues["podAnnotations"].(map[string]interface{})["checksum/secret-etcd-encryption"] = b.CheckSums[common.EtcdEncryptionSecretName]
}
if gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info) {
defaultValues["podAnnotations"].(map[string]interface{})["checksum/secret-"+common.BasicAuthSecretName] = b.CheckSums[common.BasicAuthSecretName]
}
foundDeployment := true
deployment := &appsv1.Deployment{}
if err := b.K8sSeedClient.Client().Get(context.TODO(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), deployment); err != nil && !apierrors.IsNotFound(err) {
return err
} else if apierrors.IsNotFound(err) {
foundDeployment = false
}
if b.ShootedSeed != nil {
var (
apiServer = b.ShootedSeed.APIServer
autoscaler = apiServer.Autoscaler
)
minReplicas = *autoscaler.MinReplicas
maxReplicas = autoscaler.MaxReplicas
}
if b.ShootedSeed != nil && !hvpaEnabled {
apiServer := b.ShootedSeed.APIServer
defaultValues["replicas"] = *apiServer.Replicas
defaultValues["apiServerResources"] = map[string]interface{}{
"requests": map[string]interface{}{
"cpu": "1750m",
"memory": "2Gi",
},
"limits": map[string]interface{}{
"cpu": "4000m",
"memory": "8Gi",
},
}
} else {
replicas := deployment.Spec.Replicas
// As kube-apiserver HPA manages the number of replicas, we have to maintain current number of replicas
// otherwise keep the value to default
if replicas != nil && *replicas > 0 {
defaultValues["replicas"] = *replicas
}
// If the shoot is hibernated then we want to keep the number of replicas (scale down happens later).
if b.Shoot.HibernationEnabled && (replicas == nil || *replicas == 0) {
defaultValues["replicas"] = 0
}
var cpuRequest, memoryRequest, cpuLimit, memoryLimit string
if hvpaEnabled {
cpuRequest, memoryRequest, cpuLimit, memoryLimit = getResourcesForAPIServer(b.Shoot.GetMinNodeCount(), b.Shoot.Info.Annotations[common.ShootAlphaScalingAPIServerClass])
} else {
cpuRequest, memoryRequest, cpuLimit, memoryLimit = getResourcesForAPIServer(b.Shoot.GetMaxNodeCount(), b.Shoot.Info.Annotations[common.ShootAlphaScalingAPIServerClass])
}
defaultValues["apiServerResources"] = map[string]interface{}{