/
reconciler_delete.go
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/
reconciler_delete.go
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// Copyright 2022 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 seed
import (
"context"
"errors"
"fmt"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/component"
"github.com/gardener/gardener/pkg/component/clusteridentity"
"github.com/gardener/gardener/pkg/controllerutils"
seedpkg "github.com/gardener/gardener/pkg/gardenlet/operation/seed"
"github.com/gardener/gardener/pkg/utils/flow"
"github.com/gardener/gardener/pkg/utils/managedresources"
)
func (r *Reconciler) delete(
ctx context.Context,
log logr.Logger,
seedObj *seedpkg.Seed,
seedIsGarden bool,
) error {
seed := seedObj.GetInfo()
if !sets.New(seed.Finalizers...).Has(gardencorev1beta1.GardenerName) {
return nil
}
// Before deletion, it has to be ensured that no Shoots nor BackupBuckets depend on the Seed anymore.
// When this happens the controller will remove the finalizers from the Seed so that it can be garbage collected.
parentLogMessage := "Can't delete Seed, because the following objects are still referencing it:"
associatedShoots, err := controllerutils.DetermineShootsAssociatedTo(ctx, r.GardenClient, seed)
if err != nil {
return err
}
if len(associatedShoots) > 0 {
log.Info("Cannot delete Seed because the following Shoots are still referencing it", "shoots", associatedShoots)
r.Recorder.Event(seed, corev1.EventTypeNormal, v1beta1constants.EventResourceReferenced, fmt.Sprintf("%s Shoots=%v", parentLogMessage, associatedShoots))
return errors.New("seed still has references")
}
if seed.Spec.Backup != nil {
backupBucket := &gardencorev1beta1.BackupBucket{ObjectMeta: metav1.ObjectMeta{Name: string(seed.UID)}}
if err := r.GardenClient.Delete(ctx, backupBucket); client.IgnoreNotFound(err) != nil {
return err
}
}
associatedBackupBuckets, err := controllerutils.DetermineBackupBucketAssociations(ctx, r.GardenClient, seed.Name)
if err != nil {
return err
}
if len(associatedBackupBuckets) > 0 {
log.Info("Cannot delete Seed because the following BackupBuckets are still referencing it", "backupBuckets", associatedBackupBuckets)
r.Recorder.Event(seed, corev1.EventTypeNormal, v1beta1constants.EventResourceReferenced, fmt.Sprintf("%s BackupBuckets=%v", parentLogMessage, associatedBackupBuckets))
return errors.New("seed still has references")
}
log.Info("No Shoots or BackupBuckets are referencing the Seed, deletion accepted")
if err := r.runDeleteSeedFlow(ctx, log, seedObj, seedIsGarden); err != nil {
return err
}
// Remove finalizer from Seed
if controllerutil.ContainsFinalizer(seed, gardencorev1beta1.GardenerName) {
log.Info("Removing finalizer")
if err := controllerutils.RemoveFinalizers(ctx, r.GardenClient, seed, gardencorev1beta1.GardenerName); err != nil {
return fmt.Errorf("failed to remove finalizer: %w", err)
}
}
return nil
}
func (r *Reconciler) runDeleteSeedFlow(
ctx context.Context,
log logr.Logger,
seed *seedpkg.Seed,
seedIsGarden bool,
) error {
log.Info("Instantiating component deployers")
c, err := r.instantiateComponents(ctx, log, seed, nil, seedIsGarden, nil, nil, nil)
if err != nil {
return err
}
seedIsOriginOfClusterIdentity, err := clusteridentity.IsClusterIdentityEmptyOrFromOrigin(ctx, r.SeedClientSet.Client(), v1beta1constants.ClusterIdentityOriginSeed)
if err != nil {
return err
}
var (
g = flow.NewGraph("Seed deletion")
// Delete all ingress objects in garden namespace which are not created as part of ManagedResources. This can be
// removed once all seed system components are deployed as part of ManagedResources.
// See https://github.com/gardener/gardener/issues/6062 for details.
_ = g.Add(flow.Task{
Name: "Destroying all networkingv1.Ingress resources in the garden namespace",
Fn: func(ctx context.Context) error {
return r.SeedClientSet.Client().DeleteAllOf(ctx, &networkingv1.Ingress{}, client.InNamespace(r.GardenNamespace))
},
})
// Use the managed resource for cluster-identity only if there is no cluster-identity config map in kube-system namespace from a different origin than seed.
// This prevents gardenlet from deleting the config map accidentally on seed deletion when it was created by a different party (gardener-apiserver or shoot).
destroyClusterIdentity = g.Add(flow.Task{
Name: "Destroying cluster-identity",
Fn: component.OpDestroyAndWait(c.clusterIdentity).Destroy,
SkipIf: !seedIsOriginOfClusterIdentity,
})
destroyDNSRecord = g.Add(flow.Task{
Name: "Destroying managed ingress DNS record (if existing)",
Fn: component.OpDestroyAndWait(c.ingressDNSRecord).Destroy,
})
noControllerInstallations = g.Add(flow.Task{
Name: "Ensuring no ControllerInstallations are left",
Fn: ensureNoControllerInstallations(r.GardenClient, seed.GetInfo().Name),
Dependencies: flow.NewTaskIDs(destroyDNSRecord),
})
destroyCachePrometheus = g.Add(flow.Task{
Name: "Destroying cache Prometheus",
Fn: c.cachePrometheus.Destroy,
})
destroySeedPrometheus = g.Add(flow.Task{
Name: "Destroying seed Prometheus",
Fn: c.seedPrometheus.Destroy,
})
destroyAggregatePrometheus = g.Add(flow.Task{
Name: "Destroying aggregate Prometheus",
Fn: c.aggregatePrometheus.Destroy,
})
destroyAlertManager = g.Add(flow.Task{
Name: "Destroying AlertManager",
Fn: c.alertManager.Destroy,
})
destroyClusterAutoscaler = g.Add(flow.Task{
Name: "Destroying cluster-autoscaler resources",
Fn: component.OpDestroyAndWait(c.clusterAutoscaler).Destroy,
})
destroyMachineControllerManager = g.Add(flow.Task{
Name: "Destroying machine-controller-manager resources",
Fn: component.OpDestroyAndWait(c.machineControllerManager).Destroy,
})
destroyNginxIngress = g.Add(flow.Task{
Name: "Destroying nginx-ingress",
Fn: component.OpDestroyAndWait(c.nginxIngressController).Destroy,
SkipIf: seedIsGarden,
})
destroyDWDWeeder = g.Add(flow.Task{
Name: "Destroy dependency-watchdog-weeder",
Fn: component.OpDestroyAndWait(c.dwdWeeder).Destroy,
})
destroyDWDProber = g.Add(flow.Task{
Name: "Destroy dependency-watchdog-prober",
Fn: component.OpDestroyAndWait(c.dwdProber).Destroy,
})
destroyKubeAPIServerIngress = g.Add(flow.Task{
Name: "Destroy kube-apiserver ingress",
Fn: component.OpDestroyAndWait(c.kubeAPIServerIngress).Destroy,
})
destroyKubeAPIServerService = g.Add(flow.Task{
Name: "Destroy kube-apiserver service",
Fn: component.OpDestroyAndWait(c.kubeAPIServerService).Destroy,
})
destroyVPNAuthzServer = g.Add(flow.Task{
Name: "Destroy VPN authorization server",
Fn: component.OpDestroyAndWait(c.vpnAuthzServer).Destroy,
})
destroyIstio = g.Add(flow.Task{
Name: "Destroy Istio",
Fn: component.OpDestroyAndWait(c.istio).Destroy,
})
destroyIstioCRDs = g.Add(flow.Task{
Name: "Destroy Istio CRDs",
Fn: component.OpDestroyAndWait(c.istioCRD).Destroy,
SkipIf: seedIsGarden,
Dependencies: flow.NewTaskIDs(destroyIstio),
})
destroyMachineControllerManagerCRDs = g.Add(flow.Task{
Name: "Destroy machine-controller-manager CRDs",
Fn: component.OpDestroyAndWait(c.machineCRD).Destroy,
})
destroyFluentOperatorResources = g.Add(flow.Task{
Name: "Destroy Fluent Operator Custom Resources",
Fn: component.OpDestroyAndWait(c.fluentOperatorCustomResources).Destroy,
})
// When the seed is the garden cluster then these components are reconciled by the gardener-operator.
destroyPlutono = g.Add(flow.Task{
Name: "Destroying plutono",
Fn: component.OpDestroyAndWait(c.plutono).Destroy,
SkipIf: seedIsGarden,
})
destroyEtcdDruid = g.Add(flow.Task{
Name: "Destroying etcd druid",
Fn: component.OpDestroyAndWait(c.etcdDruid).Destroy,
// only destroy Etcd CRD once all extension controllers are gone, otherwise they might not be able to start
// up again (e.g. after being evicted by VPA)
// see https://github.com/gardener/gardener/issues/6487#issuecomment-1220597217
Dependencies: flow.NewTaskIDs(noControllerInstallations),
SkipIf: seedIsGarden,
})
destroyVPA = g.Add(flow.Task{
Name: "Destroy Kubernetes vertical pod autoscaler",
Fn: component.OpDestroyAndWait(c.verticalPodAutoscaler).Destroy,
SkipIf: seedIsGarden,
})
destroyHVPA = g.Add(flow.Task{
Name: "Destroy HVPA controller",
Fn: component.OpDestroyAndWait(c.hvpaController).Destroy,
SkipIf: seedIsGarden,
})
destroyKubeStateMetrics = g.Add(flow.Task{
Name: "Destroy kube-state-metrics",
Fn: component.OpDestroyAndWait(c.kubeStateMetrics).Destroy,
SkipIf: seedIsGarden,
})
destroyPrometheusOperator = g.Add(flow.Task{
Name: "Destroy Prometheus Operator",
Fn: component.OpDestroyAndWait(c.prometheusOperator).Destroy,
SkipIf: seedIsGarden,
})
destroyFluentBit = g.Add(flow.Task{
Name: "Destroy Fluent Bit",
Fn: component.OpDestroyAndWait(c.fluentBit).Destroy,
SkipIf: seedIsGarden,
})
destroyFluentOperator = g.Add(flow.Task{
Name: "Destroy Fluent Operator",
Fn: component.OpDestroyAndWait(c.fluentOperator).Destroy,
Dependencies: flow.NewTaskIDs(destroyFluentOperatorResources, destroyFluentBit),
SkipIf: seedIsGarden,
})
destroyVali = g.Add(flow.Task{
Name: "Destroy Vali",
Fn: component.OpDestroyAndWait(c.vali).Destroy,
Dependencies: flow.NewTaskIDs(destroyFluentOperatorResources),
SkipIf: seedIsGarden,
})
destroyEtcdCRD = g.Add(flow.Task{
Name: "Destroy ETCD-related custom resource definitions",
Fn: component.OpDestroyAndWait(c.etcdCRD).Destroy,
Dependencies: flow.NewTaskIDs(destroyEtcdDruid),
SkipIf: seedIsGarden,
})
destroyFluentOperatorCRDs = g.Add(flow.Task{
Name: "Destroy Fluent Operator CRDs",
Fn: component.OpDestroyAndWait(c.fluentCRD).Destroy,
Dependencies: flow.NewTaskIDs(destroyFluentOperatorResources, noControllerInstallations),
SkipIf: seedIsGarden,
})
syncPointCleanedUp = flow.NewTaskIDs(
destroyClusterIdentity,
destroyCachePrometheus,
destroySeedPrometheus,
destroyAggregatePrometheus,
destroyAlertManager,
destroyNginxIngress,
destroyClusterAutoscaler,
destroyMachineControllerManager,
destroyDWDWeeder,
destroyDWDProber,
destroyKubeAPIServerIngress,
destroyKubeAPIServerService,
destroyVPNAuthzServer,
destroyIstio,
destroyIstioCRDs,
destroyMachineControllerManagerCRDs,
destroyFluentOperatorResources,
noControllerInstallations,
destroyPrometheusOperator,
destroyPlutono,
destroyKubeStateMetrics,
destroyEtcdDruid,
destroyHVPA,
destroyVPA,
destroyFluentBit,
destroyFluentOperator,
destroyVali,
destroyEtcdCRD,
destroyFluentOperatorCRDs,
)
destroySystemResources = g.Add(flow.Task{
Name: "Destroy system resources",
Fn: component.OpDestroyAndWait(c.system).Destroy,
Dependencies: flow.NewTaskIDs(syncPointCleanedUp),
})
ensureNoManagedResourcesExist = g.Add(flow.Task{
Name: "Ensuring all ManagedResources are gone",
Fn: ensureNoManagedResources(r.SeedClientSet.Client()),
Dependencies: flow.NewTaskIDs(destroySystemResources),
SkipIf: seedIsGarden,
})
_ = g.Add(flow.Task{
Name: "Destroying gardener-resource-manager",
Fn: c.gardenerResourceManager.Destroy,
Dependencies: flow.NewTaskIDs(ensureNoManagedResourcesExist),
SkipIf: seedIsGarden,
})
)
if err := g.Compile().Run(ctx, flow.Opts{
Log: log,
ProgressReporter: r.reportProgress(log, seed.GetInfo()),
}); err != nil {
return flow.Errors(err)
}
return nil
}
func ensureNoControllerInstallations(c client.Client, seedName string) func(ctx context.Context) error {
return func(ctx context.Context) error {
associatedControllerInstallations, err := controllerutils.DetermineControllerInstallationAssociations(ctx, c, seedName)
if err != nil {
return err
}
if associatedControllerInstallations != nil {
return fmt.Errorf("can't continue with Seed deletion, because the following objects are still referencing it: ControllerInstallations=%v", associatedControllerInstallations)
}
return nil
}
}
func ensureNoManagedResources(c client.Client) func(ctx context.Context) error {
return func(ctx context.Context) error {
managedResourcesStillExist, err := managedresources.CheckIfManagedResourcesExist(ctx, c, ptr.To(v1beta1constants.SeedResourceManagerClass))
if err != nil {
return err
}
if managedResourcesStillExist {
return fmt.Errorf("at least one ManagedResource still exists, cannot delete gardener-resource-manager")
}
return nil
}
}