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actuator.go
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actuator.go
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// Copyright 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 managedseed
import (
"context"
"fmt"
"time"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubernetesclientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/record"
"k8s.io/utils/clock"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"github.com/gardener/gardener/charts"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
seedmanagementv1alpha1 "github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1"
seedmanagementv1alpha1constants "github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1/constants"
"github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1/helper"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/controllerutils"
gardenletv1alpha1 "github.com/gardener/gardener/pkg/gardenlet/apis/config/v1alpha1"
gardenletbootstraputil "github.com/gardener/gardener/pkg/gardenlet/bootstrap/util"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Actuator acts upon ManagedSeed resources.
type Actuator interface {
// Reconcile reconciles ManagedSeed creation or update.
Reconcile(context.Context, logr.Logger, *seedmanagementv1alpha1.ManagedSeed) (*seedmanagementv1alpha1.ManagedSeedStatus, bool, error)
// Delete reconciles ManagedSeed deletion.
Delete(context.Context, logr.Logger, *seedmanagementv1alpha1.ManagedSeed) (*seedmanagementv1alpha1.ManagedSeedStatus, bool, bool, error)
}
// actuator is a concrete implementation of Actuator.
type actuator struct {
gardenConfig *rest.Config
gardenAPIReader client.Reader
gardenClient client.Client
seedClient client.Client
shootClientMap clientmap.ClientMap
clock clock.Clock
vp ValuesHelper
recorder record.EventRecorder
gardenNamespaceShoot string
}
// newActuator creates a new Actuator with the given clients, ValuesHelper, and logger.
func newActuator(
gardenConfig *rest.Config,
gardenAPIReader client.Reader,
gardenClient, seedClient client.Client,
shootClientMap clientmap.ClientMap,
clock clock.Clock,
vp ValuesHelper,
recorder record.EventRecorder,
gardenNamespaceShoot string,
) Actuator {
return &actuator{
gardenConfig: gardenConfig,
gardenAPIReader: gardenAPIReader,
gardenClient: gardenClient,
seedClient: seedClient,
shootClientMap: shootClientMap,
clock: clock,
vp: vp,
recorder: recorder,
gardenNamespaceShoot: gardenNamespaceShoot,
}
}
// Reconcile reconciles ManagedSeed creation or update.
func (a *actuator) Reconcile(
ctx context.Context,
log logr.Logger,
ms *seedmanagementv1alpha1.ManagedSeed,
) (
status *seedmanagementv1alpha1.ManagedSeedStatus,
wait bool,
err error,
) {
// Initialize status
status = ms.Status.DeepCopy()
status.ObservedGeneration = ms.Generation
defer func() {
if err != nil {
log.Error(err, "Error during reconciliation")
a.recorder.Eventf(ms, corev1.EventTypeWarning, gardencorev1beta1.EventReconcileError, err.Error())
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedSeedRegistered, gardencorev1beta1.ConditionFalse, gardencorev1beta1.EventReconcileError, err.Error())
}
}()
// Get shoot
shoot := &gardencorev1beta1.Shoot{}
if err := a.gardenAPIReader.Get(ctx, kubernetesutils.Key(ms.Namespace, ms.Spec.Shoot.Name), shoot); err != nil {
return status, false, fmt.Errorf("could not get shoot %s/%s: %w", ms.Namespace, ms.Spec.Shoot.Name, err)
}
log = log.WithValues("shootName", shoot.Name)
// Check if shoot is reconciled and update ShootReconciled condition
if !shootReconciled(shoot) {
log.Info("Waiting for shoot to be reconciled")
msg := fmt.Sprintf("Waiting for shoot %q to be reconciled", client.ObjectKeyFromObject(shoot).String())
a.recorder.Event(ms, corev1.EventTypeNormal, gardencorev1beta1.EventReconciling, msg)
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedShootReconciled, gardencorev1beta1.ConditionFalse, gardencorev1beta1.EventReconciling, msg)
return status, true, nil
}
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedShootReconciled, gardencorev1beta1.ConditionTrue, gardencorev1beta1.EventReconciled,
fmt.Sprintf("Shoot %q has been reconciled", client.ObjectKeyFromObject(shoot).String()))
// Get shoot client
shootClient, err := a.shootClientMap.GetClient(ctx, keys.ForShoot(shoot))
if err != nil {
return status, false, fmt.Errorf("could not get shoot client for shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
// Extract seed template and gardenlet config
seedTemplate, gardenletConfig, err := helper.ExtractSeedTemplateAndGardenletConfig(ms)
if err != nil {
return status, false, err
}
// Check seed spec
if err := a.checkSeedSpec(ctx, &seedTemplate.Spec, shoot); err != nil {
return status, false, err
}
// Create or update garden namespace in the shoot
log.Info("Ensuring garden namespace in shoot")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventReconciling, "Ensuring garden namespace in shoot %q", client.ObjectKeyFromObject(shoot).String())
if err := a.ensureGardenNamespace(ctx, shootClient.Client()); err != nil {
return status, false, fmt.Errorf("could not create or update garden namespace in shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
// Create or update seed secrets
log.Info("Reconciling seed secrets")
a.recorder.Event(ms, corev1.EventTypeNormal, gardencorev1beta1.EventReconciling, "Reconciling seed secrets")
if err := a.reconcileSeedSecrets(ctx, log, &seedTemplate.Spec, ms, shoot); err != nil {
return status, false, fmt.Errorf("could not reconcile seed %s secrets: %w", ms.Name, err)
}
if ms.Spec.Gardenlet != nil {
seed, err := a.getSeed(ctx, ms)
if err != nil {
return status, false, fmt.Errorf("could not read seed %s: %w", ms.Name, err)
}
// Deploy gardenlet into the shoot, it will register the seed automatically
log.Info("Deploying gardenlet into shoot")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventReconciling, "Deploying gardenlet into shoot %q", client.ObjectKeyFromObject(shoot).String())
if err := a.deployGardenlet(ctx, log, shootClient, ms, seed, gardenletConfig, shoot); err != nil {
return status, false, fmt.Errorf("could not deploy gardenlet into shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
}
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedSeedRegistered, gardencorev1beta1.ConditionTrue, gardencorev1beta1.EventReconciled,
fmt.Sprintf("Seed %s has been registered", ms.Name))
return status, false, nil
}
// Delete reconciles ManagedSeed deletion.
func (a *actuator) Delete(
ctx context.Context,
log logr.Logger,
ms *seedmanagementv1alpha1.ManagedSeed,
) (
status *seedmanagementv1alpha1.ManagedSeedStatus,
wait, removeFinalizer bool,
err error,
) {
// Initialize status
status = ms.Status.DeepCopy()
status.ObservedGeneration = ms.Generation
defer func() {
if err != nil {
log.Error(err, "Error during deletion")
a.recorder.Eventf(ms, corev1.EventTypeWarning, gardencorev1beta1.EventDeleteError, err.Error())
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedSeedRegistered, gardencorev1beta1.ConditionFalse, gardencorev1beta1.EventDeleteError, err.Error())
}
}()
// Update SeedRegistered condition
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedSeedRegistered, gardencorev1beta1.ConditionFalse, gardencorev1beta1.EventDeleting,
fmt.Sprintf("Unregistering seed %s", ms.Name))
// Get shoot
shoot := &gardencorev1beta1.Shoot{}
if err := a.gardenAPIReader.Get(ctx, kubernetesutils.Key(ms.Namespace, ms.Spec.Shoot.Name), shoot); err != nil {
return status, false, false, fmt.Errorf("could not get shoot %s/%s: %w", ms.Namespace, ms.Spec.Shoot.Name, err)
}
log = log.WithValues("shootName", shoot.Name)
// Get shoot client
shootClient, err := a.shootClientMap.GetClient(ctx, keys.ForShoot(shoot))
if err != nil {
return status, false, false, fmt.Errorf("could not get shoot client for shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
// Extract seed template and gardenlet config
seedTemplate, gardenletConfig, err := helper.ExtractSeedTemplateAndGardenletConfig(ms)
if err != nil {
return status, false, false, err
}
// Delete seed if it still exists and is not already deleting
seed, err := a.getSeed(ctx, ms)
if err != nil {
return status, false, false, fmt.Errorf("could not get seed %s: %w", ms.Name, err)
}
if seed != nil {
log = log.WithValues("seedName", seed.Name)
if seed.DeletionTimestamp == nil {
log.Info("Deleting seed")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Deleting seed %s", ms.Name)
if err := a.deleteSeed(ctx, ms); err != nil {
return status, false, false, fmt.Errorf("could not delete seed %s: %w", ms.Name, err)
}
} else {
log.Info("Waiting for seed to be deleted")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Waiting for seed %q to be deleted", ms.Name)
}
return status, false, false, nil
}
if ms.Spec.Gardenlet != nil {
// Delete gardenlet from the shoot if it still exists and is not already deleting
gardenletDeployment, err := a.getGardenletDeployment(ctx, shootClient)
if err != nil {
return status, false, false, fmt.Errorf("could not get gardenlet deployment in shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
if gardenletDeployment != nil {
if gardenletDeployment.DeletionTimestamp == nil {
log.Info("Deleting gardenlet from shoot")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Deleting gardenlet from shoot %q", client.ObjectKeyFromObject(shoot).String())
if err := a.deleteGardenlet(ctx, log, shootClient, ms, seed, gardenletConfig, shoot); err != nil {
return status, false, false, fmt.Errorf("could delete gardenlet from shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
} else {
log.Info("Waiting for gardenlet to be deleted from shoot")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Waiting for gardenlet to be deleted from shoot %q", client.ObjectKeyFromObject(shoot).String())
}
return status, true, false, nil
}
}
// Delete seed secrets if any of them still exists and is not already deleting
secret, backupSecret, err := a.getSeedSecrets(ctx, &seedTemplate.Spec, ms)
if err != nil {
return status, false, false, fmt.Errorf("could not get seed %s secrets: %w", ms.Name, err)
}
if secret != nil || backupSecret != nil {
if (secret != nil && secret.DeletionTimestamp == nil) || (backupSecret != nil && backupSecret.DeletionTimestamp == nil) {
log.Info("Deleting seed secrets")
a.recorder.Event(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Deleting seed secrets")
if err := a.deleteSeedSecrets(ctx, &seedTemplate.Spec, ms); err != nil {
return status, false, false, fmt.Errorf("could not delete seed %s secrets: %w", ms.Name, err)
}
} else {
log.Info("Waiting for seed secrets to be deleted")
a.recorder.Event(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Waiting for seed secrets to be deleted")
}
return status, true, false, nil
}
// Delete garden namespace from the shoot if it still exists and is not already deleting
gardenNamespace, err := a.getGardenNamespace(ctx, shootClient)
if err != nil {
return status, false, false, fmt.Errorf("could not check if garden namespace exists in shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
if gardenNamespace != nil {
if gardenNamespace.DeletionTimestamp == nil {
log.Info("Deleting garden namespace from shoot")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Deleting garden namespace from shoot %q", client.ObjectKeyFromObject(shoot).String())
if err := a.deleteGardenNamespace(ctx, shootClient); err != nil {
return status, false, false, fmt.Errorf("could not delete garden namespace from shoot %s: %w", client.ObjectKeyFromObject(shoot).String(), err)
}
} else {
log.Info("Waiting for garden namespace to be deleted from shoot")
a.recorder.Eventf(ms, corev1.EventTypeNormal, gardencorev1beta1.EventDeleting, "Waiting for garden namespace to be deleted from shoot %q", client.ObjectKeyFromObject(shoot).String())
}
return status, true, false, nil
}
updateCondition(a.clock, status, seedmanagementv1alpha1.ManagedSeedSeedRegistered, gardencorev1beta1.ConditionFalse, gardencorev1beta1.EventDeleted,
fmt.Sprintf("Seed %s has been unregistred", ms.Name))
return status, false, true, nil
}
func (a *actuator) ensureGardenNamespace(ctx context.Context, shootClient client.Client) error {
gardenNamespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: a.gardenNamespaceShoot,
},
}
if err := shootClient.Get(ctx, client.ObjectKeyFromObject(gardenNamespace), gardenNamespace); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
return shootClient.Create(ctx, gardenNamespace)
}
return nil
}
func (a *actuator) deleteGardenNamespace(ctx context.Context, shootClient kubernetes.Interface) error {
gardenNamespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: a.gardenNamespaceShoot,
},
}
return client.IgnoreNotFound(shootClient.Client().Delete(ctx, gardenNamespace))
}
func (a *actuator) getGardenNamespace(ctx context.Context, shootClient kubernetes.Interface) (*corev1.Namespace, error) {
ns := &corev1.Namespace{}
if err := shootClient.Client().Get(ctx, kubernetesutils.Key(a.gardenNamespaceShoot), ns); err != nil {
if apierrors.IsNotFound(err) {
return nil, nil
}
return nil, err
}
return ns, nil
}
func (a *actuator) deleteSeed(ctx context.Context, managedSeed *seedmanagementv1alpha1.ManagedSeed) error {
seed := &gardencorev1beta1.Seed{
ObjectMeta: metav1.ObjectMeta{
Name: managedSeed.Name,
},
}
return client.IgnoreNotFound(a.gardenClient.Delete(ctx, seed))
}
func (a *actuator) getSeed(ctx context.Context, managedSeed *seedmanagementv1alpha1.ManagedSeed) (*gardencorev1beta1.Seed, error) {
seed := &gardencorev1beta1.Seed{}
if err := a.gardenClient.Get(ctx, kubernetesutils.Key(managedSeed.Name), seed); err != nil {
if apierrors.IsNotFound(err) {
return nil, nil
}
return nil, err
}
return seed, nil
}
func (a *actuator) deployGardenlet(
ctx context.Context,
log logr.Logger,
shootClient kubernetes.Interface,
managedSeed *seedmanagementv1alpha1.ManagedSeed,
seed *gardencorev1beta1.Seed,
gardenletConfig *gardenletv1alpha1.GardenletConfiguration,
shoot *gardencorev1beta1.Shoot,
) error {
// Prepare gardenlet chart values
values, err := a.prepareGardenletChartValues(
ctx,
log,
shootClient,
managedSeed,
seed,
gardenletConfig,
helper.GetBootstrap(managedSeed.Spec.Gardenlet.Bootstrap),
pointer.BoolDeref(managedSeed.Spec.Gardenlet.MergeWithParent, false),
shoot,
)
if err != nil {
return err
}
// Apply gardenlet chart
if err := shootClient.ChartApplier().ApplyFromEmbeddedFS(ctx, charts.ChartGardenlet, charts.ChartPathGardenlet, a.gardenNamespaceShoot, "gardenlet", kubernetes.Values(values)); err != nil {
return err
}
// remove renew-kubeconfig annotation, if it exists
if managedSeed.Annotations[v1beta1constants.GardenerOperation] == v1beta1constants.GardenerOperationRenewKubeconfig {
patch := client.MergeFrom(managedSeed.DeepCopy())
delete(managedSeed.Annotations, v1beta1constants.GardenerOperation)
if err := a.gardenClient.Patch(ctx, managedSeed, patch); err != nil {
return err
}
}
return nil
}
func (a *actuator) deleteGardenlet(
ctx context.Context,
log logr.Logger,
shootClient kubernetes.Interface,
managedSeed *seedmanagementv1alpha1.ManagedSeed,
seed *gardencorev1beta1.Seed,
gardenletConfig *gardenletv1alpha1.GardenletConfiguration,
shoot *gardencorev1beta1.Shoot,
) error {
// Prepare gardenlet chart values
values, err := a.prepareGardenletChartValues(
ctx,
log,
shootClient,
managedSeed,
seed,
gardenletConfig,
helper.GetBootstrap(managedSeed.Spec.Gardenlet.Bootstrap),
pointer.BoolDeref(managedSeed.Spec.Gardenlet.MergeWithParent, false),
shoot,
)
if err != nil {
return err
}
// Delete gardenlet chart
return shootClient.ChartApplier().DeleteFromEmbeddedFS(ctx, charts.ChartGardenlet, charts.ChartPathGardenlet, a.gardenNamespaceShoot, "gardenlet", kubernetes.Values(values))
}
func (a *actuator) getGardenletDeployment(ctx context.Context, shootClient kubernetes.Interface) (*appsv1.Deployment, error) {
deployment := &appsv1.Deployment{}
if err := shootClient.Client().Get(ctx, kubernetesutils.Key(a.gardenNamespaceShoot, v1beta1constants.DeploymentNameGardenlet), deployment); err != nil {
if apierrors.IsNotFound(err) {
return nil, nil
}
return nil, err
}
return deployment, nil
}
func (a *actuator) checkSeedSpec(ctx context.Context, spec *gardencorev1beta1.SeedSpec, shoot *gardencorev1beta1.Shoot) error {
// If VPA is enabled, check if the shoot namespace in the seed contains a vpa-admission-controller deployment
if v1beta1helper.SeedSettingVerticalPodAutoscalerEnabled(spec.Settings) {
seedVPAAdmissionControllerExists, err := a.seedVPADeploymentExists(ctx, a.seedClient, shoot)
if err != nil {
return err
}
if seedVPAAdmissionControllerExists {
return fmt.Errorf("seed VPA is enabled but shoot already has a VPA")
}
}
return nil
}
func (a *actuator) reconcileSeedSecrets(ctx context.Context, log logr.Logger, spec *gardencorev1beta1.SeedSpec, managedSeed *seedmanagementv1alpha1.ManagedSeed, shoot *gardencorev1beta1.Shoot) error {
// Get shoot secret
shootSecret, err := a.getShootSecret(ctx, shoot)
if err != nil {
return err
}
// If backup is specified, create or update the backup secret if it doesn't exist or is owned by the managed seed
if spec.Backup != nil {
// Get backup secret
backupSecret, err := kubernetesutils.GetSecretByReference(ctx, a.gardenClient, &spec.Backup.SecretRef)
if client.IgnoreNotFound(err) != nil {
return err
}
// Create or update backup secret if it doesn't exist or is owned by the managed seed
if apierrors.IsNotFound(err) || metav1.IsControlledBy(backupSecret, managedSeed) {
secret := &corev1.Secret{
ObjectMeta: kubernetesutils.ObjectMeta(spec.Backup.SecretRef.Namespace, spec.Backup.SecretRef.Name),
}
if _, err := controllerutils.CreateOrGetAndStrategicMergePatch(ctx, a.gardenClient, secret, func() error {
secret.OwnerReferences = []metav1.OwnerReference{
*metav1.NewControllerRef(managedSeed, seedmanagementv1alpha1.SchemeGroupVersion.WithKind("ManagedSeed")),
}
secret.Type = corev1.SecretTypeOpaque
secret.Data = shootSecret.Data
return nil
}); err != nil {
return err
}
}
}
// If secret reference is specified and the static token kubeconfig is enabled,
// create or update the corresponding secret with the kubeconfig from the static token kubeconfig secret.
if spec.SecretRef != nil && pointer.BoolDeref(shoot.Spec.Kubernetes.EnableStaticTokenKubeconfig, false) {
// Get shoot kubeconfig secret
shootKubeconfigSecret, err := a.getShootKubeconfigSecret(ctx, shoot)
if err != nil {
return err
}
// Create or update seed secret
secret := &corev1.Secret{
ObjectMeta: kubernetesutils.ObjectMeta(spec.SecretRef.Namespace, spec.SecretRef.Name),
}
if _, err := controllerutils.CreateOrGetAndStrategicMergePatch(ctx, a.gardenClient, secret, func() error {
secret.OwnerReferences = []metav1.OwnerReference{
*metav1.NewControllerRef(managedSeed, seedmanagementv1alpha1.SchemeGroupVersion.WithKind("ManagedSeed")),
}
secret.Type = corev1.SecretTypeOpaque
secret.Data = map[string][]byte{
kubernetes.KubeConfig: shootKubeconfigSecret.Data[kubernetes.KubeConfig],
}
return nil
}); err != nil {
return err
}
}
// When the secretRef is unset, cleanup the secret if the reference annotations are present in the managedseed.
if spec.SecretRef == nil &&
metav1.HasAnnotation(managedSeed.ObjectMeta, seedmanagementv1alpha1constants.AnnotationSeedSecretName) &&
metav1.HasAnnotation(managedSeed.ObjectMeta, seedmanagementv1alpha1constants.AnnotationSeedSecretNamespace) {
secret, err := kubernetesutils.GetSecretByReference(ctx,
a.gardenClient,
&corev1.SecretReference{
Name: managedSeed.Annotations[seedmanagementv1alpha1constants.AnnotationSeedSecretName],
Namespace: managedSeed.Annotations[seedmanagementv1alpha1constants.AnnotationSeedSecretNamespace],
},
)
if err != nil {
return fmt.Errorf("failed getting secret in the managedseed annotations: %w", err)
}
if metav1.IsControlledBy(secret, managedSeed) {
// This finalizer is added by the seed controller, but it cannot remove it when the secretRef is unset.
if controllerutil.ContainsFinalizer(secret, gardencorev1beta1.ExternalGardenerName) {
if err := controllerutils.RemoveFinalizers(ctx, a.gardenClient, secret, gardencorev1beta1.ExternalGardenerName); err != nil {
return fmt.Errorf("failed to remove finalizer from secret referred by managedseed: %w", err)
}
}
if err := a.gardenClient.Delete(ctx, secret); client.IgnoreNotFound(err) != nil {
return fmt.Errorf("error deleting seed secret referred by managedseed: %w", err)
}
log.Info("Deleted seed secret referred by managedseed", "secretName", secret.Name, "secretNamespace", secret.Namespace)
patch := client.MergeFrom(managedSeed.DeepCopy())
delete(managedSeed.Annotations, seedmanagementv1alpha1constants.AnnotationSeedSecretName)
delete(managedSeed.Annotations, seedmanagementv1alpha1constants.AnnotationSeedSecretNamespace)
if err := a.gardenClient.Patch(ctx, managedSeed, patch); err != nil {
return fmt.Errorf("error removing seed secret reference annotations: %w", err)
}
}
}
return nil
}
func (a *actuator) deleteSeedSecrets(ctx context.Context, spec *gardencorev1beta1.SeedSpec, managedSeed *seedmanagementv1alpha1.ManagedSeed) error {
// If backup is specified, delete the backup secret if it exists and is owned by the managed seed
if spec.Backup != nil {
backupSecret, err := kubernetesutils.GetSecretByReference(ctx, a.gardenClient, &spec.Backup.SecretRef)
if client.IgnoreNotFound(err) != nil {
return err
}
if err == nil && metav1.IsControlledBy(backupSecret, managedSeed) {
if err := kubernetesutils.DeleteSecretByReference(ctx, a.gardenClient, &spec.Backup.SecretRef); err != nil {
return err
}
}
}
// If secret reference is specified, delete the corresponding secret
if spec.SecretRef != nil {
if err := kubernetesutils.DeleteSecretByReference(ctx, a.gardenClient, spec.SecretRef); err != nil {
return err
}
}
return nil
}
func (a *actuator) getSeedSecrets(ctx context.Context, spec *gardencorev1beta1.SeedSpec, managedSeed *seedmanagementv1alpha1.ManagedSeed) (*corev1.Secret, *corev1.Secret, error) {
var secret, backupSecret *corev1.Secret
var err error
// If backup is specified, get the backup secret if it exists and is owned by the managed seed
if spec.Backup != nil {
backupSecret, err = kubernetesutils.GetSecretByReference(ctx, a.gardenClient, &spec.Backup.SecretRef)
if client.IgnoreNotFound(err) != nil {
return nil, nil, err
}
if backupSecret != nil && !metav1.IsControlledBy(backupSecret, managedSeed) {
backupSecret = nil
}
}
// If secret reference is specified, get the corresponding secret if it exists
if spec.SecretRef != nil {
secret, err = kubernetesutils.GetSecretByReference(ctx, a.gardenClient, spec.SecretRef)
if client.IgnoreNotFound(err) != nil {
return nil, nil, err
}
}
return secret, backupSecret, nil
}
func (a *actuator) getShootSecret(ctx context.Context, shoot *gardencorev1beta1.Shoot) (*corev1.Secret, error) {
shootSecretBinding := &gardencorev1beta1.SecretBinding{}
if shoot.Spec.SecretBindingName == nil {
return nil, fmt.Errorf("secretbinding name is nil for the Shoot: %s/%s", shoot.Namespace, shoot.Name)
}
if err := a.gardenClient.Get(ctx, kubernetesutils.Key(shoot.Namespace, *shoot.Spec.SecretBindingName), shootSecretBinding); err != nil {
return nil, err
}
return kubernetesutils.GetSecretByReference(ctx, a.gardenClient, &shootSecretBinding.SecretRef)
}
func (a *actuator) getShootKubeconfigSecret(ctx context.Context, shoot *gardencorev1beta1.Shoot) (*corev1.Secret, error) {
shootKubeconfigSecret := &corev1.Secret{}
if err := a.gardenClient.Get(ctx, kubernetesutils.Key(shoot.Namespace, gardenerutils.ComputeShootProjectSecretName(shoot.Name, gardenerutils.ShootProjectSecretSuffixKubeconfig)), shootKubeconfigSecret); err != nil {
return nil, err
}
return shootKubeconfigSecret, nil
}
func (a *actuator) seedVPADeploymentExists(ctx context.Context, seedClient client.Client, shoot *gardencorev1beta1.Shoot) (bool, error) {
if err := seedClient.Get(ctx, kubernetesutils.Key(shoot.Status.TechnicalID, "vpa-admission-controller"), &appsv1.Deployment{}); err != nil {
if apierrors.IsNotFound(err) {
return false, nil
}
return false, err
}
return true, nil
}
func (a *actuator) prepareGardenletChartValues(
ctx context.Context,
log logr.Logger,
shootClient kubernetes.Interface,
managedSeed *seedmanagementv1alpha1.ManagedSeed,
seed *gardencorev1beta1.Seed,
gardenletConfig *gardenletv1alpha1.GardenletConfiguration,
bootstrap seedmanagementv1alpha1.Bootstrap,
mergeWithParent bool,
shoot *gardencorev1beta1.Shoot,
) (map[string]interface{}, error) {
// Merge gardenlet deployment with parent values
deployment, err := a.vp.MergeGardenletDeployment(managedSeed.Spec.Gardenlet.Deployment, shoot)
if err != nil {
return nil, err
}
// Merge gardenlet configuration with parent if specified
if mergeWithParent {
gardenletConfig, err = a.vp.MergeGardenletConfiguration(gardenletConfig)
if err != nil {
return nil, err
}
}
// Ensure garden client connection is set
if gardenletConfig.GardenClientConnection == nil {
gardenletConfig.GardenClientConnection = &gardenletv1alpha1.GardenClientConnection{}
}
// Prepare garden client connection
var bootstrapKubeconfig string
if bootstrap == seedmanagementv1alpha1.BootstrapNone {
a.removeBootstrapConfigFromGardenClientConnection(gardenletConfig.GardenClientConnection)
} else {
bootstrapKubeconfig, err = a.prepareGardenClientConnectionWithBootstrap(ctx, log, shootClient, gardenletConfig.GardenClientConnection, managedSeed, seed, bootstrap)
if err != nil {
return nil, err
}
}
// Ensure seed config is set
if gardenletConfig.SeedConfig == nil {
gardenletConfig.SeedConfig = &gardenletv1alpha1.SeedConfig{}
}
// Set the seed name
gardenletConfig.SeedConfig.SeedTemplate.Name = managedSeed.Name
// Get gardenlet chart values
return a.vp.GetGardenletChartValues(
ensureGardenletEnvironment(deployment, shoot.Spec.DNS),
gardenletConfig,
bootstrapKubeconfig,
)
}
// ensureGardenletEnvironment sets the KUBERNETES_SERVICE_HOST to the API of the ManagedSeed cluster.
// This is needed so that the deployed gardenlet can properly set the network policies allowing
// access of control plane components of the hosted shoots to the API server of the (managed) seed.
func ensureGardenletEnvironment(deployment *seedmanagementv1alpha1.GardenletDeployment, dns *gardencorev1beta1.DNS) *seedmanagementv1alpha1.GardenletDeployment {
const kubernetesServiceHost = "KUBERNETES_SERVICE_HOST"
var shootDomain = ""
if deployment.Env == nil {
deployment.Env = []corev1.EnvVar{}
}
for _, env := range deployment.Env {
if env.Name == kubernetesServiceHost {
return deployment
}
}
if dns != nil && dns.Domain != nil && len(*dns.Domain) != 0 {
shootDomain = gardenerutils.GetAPIServerDomain(*dns.Domain)
}
if len(shootDomain) != 0 {
deployment.Env = append(
deployment.Env,
corev1.EnvVar{
Name: kubernetesServiceHost,
Value: shootDomain,
},
)
}
return deployment
}
func (a *actuator) prepareGardenClientConnectionWithBootstrap(
ctx context.Context,
log logr.Logger,
shootClient kubernetes.Interface,
gcc *gardenletv1alpha1.GardenClientConnection,
managedSeed *seedmanagementv1alpha1.ManagedSeed,
seed *gardencorev1beta1.Seed,
bootstrap seedmanagementv1alpha1.Bootstrap,
) (
string,
error,
) {
// Ensure kubeconfig secret is set
if gcc.KubeconfigSecret == nil {
gcc.KubeconfigSecret = &corev1.SecretReference{
Name: GardenletDefaultKubeconfigSecretName,
Namespace: a.gardenNamespaceShoot,
}
}
if seed != nil && seed.Status.ClientCertificateExpirationTimestamp != nil && seed.Status.ClientCertificateExpirationTimestamp.UTC().Before(time.Now().UTC()) {
// Check if client certificate is expired. If yes then delete the existing kubeconfig secret to make sure that the
// seed can be re-bootstrapped.
if err := kubernetesutils.DeleteSecretByReference(ctx, shootClient.Client(), gcc.KubeconfigSecret); err != nil {
return "", err
}
} else if managedSeed.Annotations[v1beta1constants.GardenerOperation] == v1beta1constants.GardenerOperationRenewKubeconfig {
// Also remove the kubeconfig if the renew-kubeconfig operation annotation is set on the ManagedSeed resource.
log.Info("Renewing gardenlet kubeconfig secret due to operation annotation")
a.recorder.Event(managedSeed, corev1.EventTypeNormal, gardencorev1beta1.EventReconciling, "Renewing gardenlet kubeconfig secret due to operation annotation")
if err := kubernetesutils.DeleteSecretByReference(ctx, shootClient.Client(), gcc.KubeconfigSecret); err != nil {
return "", err
}
} else {
seedIsAlreadyBootstrapped, err := isAlreadyBootstrapped(ctx, shootClient.Client(), gcc.KubeconfigSecret)
if err != nil {
return "", err
}
if seedIsAlreadyBootstrapped {
return "", nil
}
}
// Ensure kubeconfig is not set
gcc.Kubeconfig = ""
// Ensure bootstrap kubeconfig secret is set
if gcc.BootstrapKubeconfig == nil {
gcc.BootstrapKubeconfig = &corev1.SecretReference{
Name: GardenletDefaultKubeconfigBootstrapSecretName,
Namespace: a.gardenNamespaceShoot,
}
}
return a.createBootstrapKubeconfig(ctx, managedSeed.ObjectMeta, bootstrap, gcc.GardenClusterAddress, gcc.GardenClusterCACert)
}
// isAlreadyBootstrapped checks if the gardenlet already has a valid Garden cluster certificate through TLS bootstrapping
// by checking if the specified secret reference already exists
func isAlreadyBootstrapped(ctx context.Context, c client.Client, s *corev1.SecretReference) (bool, error) {
// If kubeconfig secret exists, return an empty result, since the bootstrap can be skipped
secret, err := kubernetesutils.GetSecretByReference(ctx, c, s)
if client.IgnoreNotFound(err) != nil {
return false, err
}
return secret != nil, nil
}
func (a *actuator) removeBootstrapConfigFromGardenClientConnection(gcc *gardenletv1alpha1.GardenClientConnection) {
// Ensure kubeconfig secret and bootstrap kubeconfig secret are not set
gcc.KubeconfigSecret = nil
gcc.BootstrapKubeconfig = nil
}
// createBootstrapKubeconfig creates a kubeconfig for the Garden cluster
// containing either the token of a service account or a bootstrap token
// returns the kubeconfig as a string
func (a *actuator) createBootstrapKubeconfig(ctx context.Context, objectMeta metav1.ObjectMeta, bootstrap seedmanagementv1alpha1.Bootstrap, address *string, caCert []byte) (string, error) {
var (
err error
bootstrapKubeconfig []byte
)
gardenClientRestConfig := gardenerutils.PrepareGardenClientRestConfig(a.gardenConfig, address, caCert)
switch bootstrap {
case seedmanagementv1alpha1.BootstrapServiceAccount:
// Create a kubeconfig containing the token of a temporary service account as client credentials
var (
serviceAccountName = gardenletbootstraputil.ServiceAccountName(objectMeta.Name)
serviceAccountNamespace = objectMeta.Namespace
)
// Create a kubeconfig containing a valid service account token as client credentials
kubernetesClientSet, err := kubernetesclientset.NewForConfig(gardenClientRestConfig)
if err != nil {
return "", fmt.Errorf("failed creating Kubernetes client: %w", err)
}
bootstrapKubeconfig, err = gardenletbootstraputil.ComputeGardenletKubeconfigWithServiceAccountToken(ctx, a.gardenClient, kubernetesClientSet.CoreV1(), gardenClientRestConfig, serviceAccountName, serviceAccountNamespace)
if err != nil {
return "", err
}
case seedmanagementv1alpha1.BootstrapToken:
var (
tokenID = gardenletbootstraputil.TokenID(objectMeta)
tokenDescription = gardenletbootstraputil.Description(gardenletbootstraputil.KindManagedSeed, objectMeta.Namespace, objectMeta.Name)
tokenValidity = 24 * time.Hour
)
// Create a kubeconfig containing a valid bootstrap token as client credentials
bootstrapKubeconfig, err = gardenletbootstraputil.ComputeGardenletKubeconfigWithBootstrapToken(ctx, a.gardenClient, gardenClientRestConfig, tokenID, tokenDescription, tokenValidity)
if err != nil {
return "", err
}
}
return string(bootstrapKubeconfig), nil
}
func shootReconciled(shoot *gardencorev1beta1.Shoot) bool {
lastOp := shoot.Status.LastOperation
return shoot.Generation == shoot.Status.ObservedGeneration && lastOp != nil && lastOp.State == gardencorev1beta1.LastOperationStateSucceeded
}
func updateCondition(clock clock.Clock, status *seedmanagementv1alpha1.ManagedSeedStatus, ct gardencorev1beta1.ConditionType, cs gardencorev1beta1.ConditionStatus, reason, message string) {
condition := v1beta1helper.GetOrInitConditionWithClock(clock, status.Conditions, ct)
condition = v1beta1helper.UpdatedConditionWithClock(clock, condition, cs, reason, message)
status.Conditions = v1beta1helper.MergeConditions(status.Conditions, condition)
}