/
reconciler_delete.go
692 lines (659 loc) · 35.3 KB
/
reconciler_delete.go
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// Copyright 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 shoot
import (
"context"
"fmt"
"strconv"
"time"
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"
"k8s.io/utils/pointer"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "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/clientmap/keys"
"github.com/gardener/gardener/pkg/operation"
botanistpkg "github.com/gardener/gardener/pkg/operation/botanist"
"github.com/gardener/gardener/pkg/utils/errors"
"github.com/gardener/gardener/pkg/utils/flow"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
retryutils "github.com/gardener/gardener/pkg/utils/retry"
)
// runDeleteShootFlow deletes a Shoot cluster.
// It receives an Operation object <o> which stores the Shoot object and an ErrorContext which contains error from the previous operation.
func (r *Reconciler) runDeleteShootFlow(ctx context.Context, o *operation.Operation) *v1beta1helper.WrappedLastErrors {
var (
botanist *botanistpkg.Botanist
kubeAPIServerDeploymentFound = true
kubeControllerManagerDeploymentFound = true
kubeAPIServerDeploymentReplicas int32
infrastructure *extensionsv1alpha1.Infrastructure
controlPlaneDeploymentNeeded bool
tasksWithErrors []string
err error
)
for _, lastError := range o.Shoot.GetInfo().Status.LastErrors {
if lastError.TaskID != nil {
tasksWithErrors = append(tasksWithErrors, *lastError.TaskID)
}
}
errorContext := errors.NewErrorContext("Shoot cluster deletion", tasksWithErrors)
err = errors.HandleErrors(errorContext,
func(errorID string) error {
o.CleanShootTaskError(ctx, errorID)
return nil
},
nil,
errors.ToExecute("Create botanist", func() error {
return retryutils.UntilTimeout(ctx, 10*time.Second, 10*time.Minute, func(context.Context) (done bool, err error) {
botanist, err = botanistpkg.New(ctx, o)
if err != nil {
return retryutils.MinorError(err)
}
return retryutils.Ok()
})
}),
errors.ToExecute("Check required extensions exist", func() error {
return botanist.WaitUntilRequiredExtensionsReady(ctx)
}),
// We first check whether the namespace in the Seed cluster does exist - if it does not, then we assume that
// all resources have already been deleted. We can delete the Shoot resource as a consequence.
errors.ToExecute("Retrieve the Shoot namespace in the Seed cluster", func() error {
return checkIfSeedNamespaceExists(ctx, o, botanist)
}),
// We check whether the kube-apiserver deployment exists in the shoot namespace. If it does not, then we assume
// that it has never been deployed successfully, or that we have deleted it in a previous run because we already
// cleaned up. We follow that no (more) resources can have been deployed in the shoot cluster, thus there is nothing
// to delete anymore.
errors.ToExecute("Retrieve kube-apiserver deployment in the shoot namespace in the seed cluster", func() error {
deploymentKubeAPIServer := &appsv1.Deployment{}
if err := botanist.SeedClientSet.APIReader().Get(ctx, kubernetesutils.Key(o.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), deploymentKubeAPIServer); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
kubeAPIServerDeploymentFound = false
} else if deploymentKubeAPIServer.DeletionTimestamp != nil {
kubeAPIServerDeploymentFound = false
} else if deploymentKubeAPIServer.Spec.Replicas != nil {
kubeAPIServerDeploymentReplicas = *deploymentKubeAPIServer.Spec.Replicas
}
return nil
}),
// We check whether the kube-controller-manager deployment exists in the shoot namespace. If it does not, then we assume
// that it has never been deployed successfully, or that we have deleted it in a previous run because we already
// cleaned up.
errors.ToExecute("Retrieve the kube-controller-manager deployment in the shoot namespace in the seed cluster", func() error {
deploymentKubeControllerManager := &appsv1.Deployment{}
if err := botanist.SeedClientSet.APIReader().Get(ctx, kubernetesutils.Key(o.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeControllerManager), deploymentKubeControllerManager); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
kubeControllerManagerDeploymentFound = false
}
if deploymentKubeControllerManager.DeletionTimestamp != nil {
kubeControllerManagerDeploymentFound = false
}
return nil
}),
errors.ToExecute("Retrieve the infrastructure resource", func() error {
if o.Shoot.IsWorkerless {
return nil
}
obj, err := botanist.Shoot.Components.Extensions.Infrastructure.Get(ctx)
if err != nil {
if apierrors.IsNotFound(err) {
return nil
}
return err
}
infrastructure = obj
return nil
}),
errors.ToExecute("Check whether control plane deployment is needed", func() error {
controlPlaneDeploymentNeeded, err = needsControlPlaneDeployment(ctx, o, kubeAPIServerDeploymentFound, infrastructure)
return err
}),
)
if err != nil {
return v1beta1helper.NewWrappedLastErrors(v1beta1helper.FormatLastErrDescription(err), err)
}
var (
nonTerminatingNamespace = botanist.SeedNamespaceObject.UID != "" && botanist.SeedNamespaceObject.Status.Phase != corev1.NamespaceTerminating
cleanupShootResources = nonTerminatingNamespace && kubeAPIServerDeploymentFound && (infrastructure != nil || o.Shoot.IsWorkerless)
defaultInterval = 5 * time.Second
defaultTimeout = 30 * time.Second
staticNodesCIDR = o.Shoot.GetInfo().Spec.Networking != nil && o.Shoot.GetInfo().Spec.Networking.Nodes != nil
useSNI = botanist.APIServerSNIEnabled()
sniPhase = botanist.Shoot.Components.ControlPlane.KubeAPIServerSNIPhase
g = flow.NewGraph("Shoot cluster deletion")
ensureShootStateExists = g.Add(flow.Task{
Name: "Ensuring that ShootState exists",
Fn: flow.TaskFn(botanist.EnsureShootStateExists).RetryUntilTimeout(defaultInterval, defaultTimeout),
})
ensureShootClusterIdentity = g.Add(flow.Task{
Name: "Ensuring Shoot cluster identity",
Fn: flow.TaskFn(botanist.EnsureShootClusterIdentity).RetryUntilTimeout(defaultInterval, defaultTimeout),
})
// We need to ensure that the deployed cloud provider secret is up-to-date. In case it has changed then we
// need to redeploy the cloud provider config (containing the secrets for some cloud providers) as well as
// restart the components using the secrets (cloud controller, controller manager). We also need to update all
// existing machine class secrets.
deployCloudProviderSecret = g.Add(flow.Task{
Name: "Deploying cloud provider account secret",
Fn: flow.TaskFn(botanist.DeployCloudProviderSecret).DoIf(nonTerminatingNamespace).SkipIf(o.Shoot.IsWorkerless),
})
deployKubeAPIServerService = g.Add(flow.Task{
Name: "Deploying Kubernetes API server service in the Seed cluster",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.DeployKubeAPIService(ctx, sniPhase)
}).DoIf(cleanupShootResources).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(ensureShootClusterIdentity),
})
_ = g.Add(flow.Task{
Name: "Deploying Kubernetes API server service SNI settings in the Seed cluster",
Fn: flow.TaskFn(botanist.DeployKubeAPIServerSNI).RetryUntilTimeout(defaultInterval, defaultTimeout).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployKubeAPIServerService),
})
waitUntilKubeAPIServerServiceIsReady = g.Add(flow.Task{
Name: "Waiting until Kubernetes API LoadBalancer in the Seed cluster has reported readiness",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.KubeAPIServerService.Wait).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployKubeAPIServerService),
})
_ = g.Add(flow.Task{
Name: "Ensuring advertised addresses for the Shoot",
Fn: botanist.UpdateAdvertisedAddresses,
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerServiceIsReady),
})
initializeSecretsManagement = g.Add(flow.Task{
Name: "Initializing secrets management",
Fn: flow.TaskFn(botanist.InitializeSecretsManagement).DoIf(nonTerminatingNamespace).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(ensureShootStateExists),
})
deployReferencedResources = g.Add(flow.Task{
Name: "Deploying referenced resources",
Fn: flow.TaskFn(botanist.DeployReferencedResources).RetryUntilTimeout(defaultInterval, defaultTimeout).DoIf(nonTerminatingNamespace),
Dependencies: flow.NewTaskIDs(ensureShootStateExists),
})
deployOwnerDomainDNSRecord = g.Add(flow.Task{
Name: "Deploying owner domain DNS record",
Fn: flow.TaskFn(botanist.DeployOwnerDNSResources).DoIf(nonTerminatingNamespace),
Dependencies: flow.NewTaskIDs(ensureShootStateExists, deployReferencedResources),
})
deployInternalDomainDNSRecord = g.Add(flow.Task{
Name: "Deploying internal domain DNS record",
Fn: flow.TaskFn(botanist.DeployOrDestroyInternalDNSRecord).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployReferencedResources, waitUntilKubeAPIServerServiceIsReady, deployOwnerDomainDNSRecord),
})
deployETCD = g.Add(flow.Task{
Name: "Deploying main and events etcd",
Fn: flow.TaskFn(botanist.DeployEtcd).RetryUntilTimeout(defaultInterval, defaultTimeout).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(initializeSecretsManagement, deployCloudProviderSecret, deployOwnerDomainDNSRecord),
})
scaleETCD = g.Add(flow.Task{
Name: "Scaling up etcd main and event",
Fn: flow.TaskFn(botanist.ScaleUpETCD).RetryUntilTimeout(defaultInterval, defaultTimeout).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployETCD),
})
waitUntilEtcdReady = g.Add(flow.Task{
Name: "Waiting until main and event etcd report readiness",
Fn: flow.TaskFn(botanist.WaitUntilEtcdsReady).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(scaleETCD),
})
// Redeploy the control plane to make sure all components that depend on the cloud provider secret are restarted
// in case it has changed. Also, it's needed for other control plane components like the kube-apiserver or kube-
// controller-manager to be updateable due to provider config injection.
deployControlPlane = g.Add(flow.Task{
Name: "Deploying Shoot control plane",
Fn: flow.TaskFn(botanist.DeployControlPlane).RetryUntilTimeout(defaultInterval, defaultTimeout).DoIf(cleanupShootResources && controlPlaneDeploymentNeeded).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(initializeSecretsManagement, deployCloudProviderSecret, ensureShootClusterIdentity),
})
waitUntilControlPlaneReady = g.Add(flow.Task{
Name: "Waiting until Shoot control plane has been reconciled",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ControlPlane.Wait(ctx)
}).DoIf(cleanupShootResources && controlPlaneDeploymentNeeded).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(deployControlPlane),
})
deployKubeAPIServer = g.Add(flow.Task{
Name: "Deploying Kubernetes API server",
Fn: flow.TaskFn(botanist.DeployKubeAPIServer).RetryUntilTimeout(defaultInterval, defaultTimeout).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(
initializeSecretsManagement,
deployETCD,
waitUntilEtcdReady,
waitUntilKubeAPIServerServiceIsReady,
waitUntilControlPlaneReady,
).InsertIf(!staticNodesCIDR),
})
scaleUpKubeAPIServer = g.Add(flow.Task{
Name: "Scaling up Kubernetes API server",
Fn: flow.TaskFn(botanist.ScaleKubeAPIServerToOne).
RetryUntilTimeout(defaultInterval, defaultTimeout).
DoIf(cleanupShootResources && kubeAPIServerDeploymentReplicas == 0),
Dependencies: flow.NewTaskIDs(deployKubeAPIServer),
})
waitUntilKubeAPIServerIsReady = g.Add(flow.Task{
Name: "Waiting until Kubernetes API server reports readiness",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.KubeAPIServer.Wait).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployKubeAPIServer, scaleUpKubeAPIServer),
})
setGardenerResourceManagerReplicas = g.Add(flow.Task{
Name: "Setting gardener-resource-manager replicas to 2",
Fn: flow.TaskFn(func(_ context.Context) error {
botanist.Shoot.Components.ControlPlane.ResourceManager.SetReplicas(pointer.Int32(2))
return nil
}).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerIsReady),
})
deployGardenerResourceManager = g.Add(flow.Task{
Name: "Deploying gardener-resource-manager",
Fn: flow.TaskFn(botanist.DeployGardenerResourceManager).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(setGardenerResourceManagerReplicas),
})
waitUntilGardenerResourceManagerReady = g.Add(flow.Task{
Name: "Waiting until gardener-resource-manager reports readiness",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.ResourceManager.Wait).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployGardenerResourceManager),
})
deployGardenerAccess = g.Add(flow.Task{
Name: "Deploying Gardener shoot access resources",
Fn: flow.TaskFn(botanist.Shoot.Components.GardenerAccess.Deploy).DoIf(cleanupShootResources).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(initializeSecretsManagement, waitUntilGardenerResourceManagerReady),
})
deployControlPlaneExposure = g.Add(flow.Task{
Name: "Deploying shoot control plane exposure components",
Fn: flow.TaskFn(botanist.DeployControlPlaneExposure).RetryUntilTimeout(defaultInterval, defaultTimeout).SkipIf(o.Shoot.IsWorkerless || useSNI).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployReferencedResources, waitUntilKubeAPIServerIsReady),
})
waitUntilControlPlaneExposureReady = g.Add(flow.Task{
Name: "Waiting until Shoot control plane exposure has been reconciled",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ControlPlaneExposure.Wait(ctx)
}).SkipIf(o.Shoot.IsWorkerless || useSNI).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(deployControlPlaneExposure),
})
initializeShootClients = g.Add(flow.Task{
Name: "Initializing connection to Shoot",
Fn: flow.TaskFn(botanist.InitializeDesiredShootClients).DoIf(cleanupShootResources).RetryUntilTimeout(defaultInterval, 2*time.Minute),
Dependencies: flow.NewTaskIDs(deployCloudProviderSecret, waitUntilKubeAPIServerIsReady, deployInternalDomainDNSRecord, waitUntilControlPlaneExposureReady, deployGardenerAccess),
})
// Redeploy the worker extensions, and kube-controller-manager to make sure all components that depend on the
// cloud provider secret are restarted in case it has changed.
deployKubeControllerManager = g.Add(flow.Task{
Name: "Deploying Kubernetes controller manager",
Fn: flow.TaskFn(botanist.DeployKubeControllerManager).DoIf(cleanupShootResources && kubeControllerManagerDeploymentFound).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(initializeSecretsManagement, deployCloudProviderSecret, waitUntilControlPlaneReady, initializeShootClients),
})
_ = g.Add(flow.Task{
Name: "Scaling up Kubernetes controller manager",
Fn: flow.TaskFn(botanist.ScaleKubeControllerManagerToOne).DoIf(cleanupShootResources && kubeControllerManagerDeploymentFound),
Dependencies: flow.NewTaskIDs(deployKubeControllerManager),
})
deleteSeedMonitoring = g.Add(flow.Task{
Name: "Deleting shoot monitoring stack in Seed",
Fn: flow.TaskFn(botanist.DeleteSeedMonitoring).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(initializeShootClients),
})
deleteClusterAutoscaler = g.Add(flow.Task{
Name: "Deleting cluster autoscaler",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.ControlPlane.ClusterAutoscaler.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(initializeShootClients),
})
cleanupWebhooks = g.Add(flow.Task{
Name: "Cleaning up webhooks",
Fn: flow.TaskFn(botanist.CleanWebhooks).Timeout(10 * time.Minute).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(initializeShootClients, deployGardenerResourceManager),
})
waitForControllersToBeActive = g.Add(flow.Task{
Name: "Waiting until kube-controller-manager is active",
Fn: flow.TaskFn(botanist.WaitForKubeControllerManagerToBeActive).DoIf(cleanupShootResources && kubeControllerManagerDeploymentFound).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(initializeShootClients, cleanupWebhooks, deployControlPlane, deployKubeControllerManager),
})
cleanExtendedAPIs = g.Add(flow.Task{
Name: "Cleaning extended API groups",
Fn: flow.TaskFn(botanist.CleanExtendedAPIs).Timeout(10 * time.Minute).DoIf(cleanupShootResources && !metav1.HasAnnotation(o.Shoot.GetInfo().ObjectMeta, v1beta1constants.AnnotationShootSkipCleanup)),
Dependencies: flow.NewTaskIDs(initializeShootClients, deleteClusterAutoscaler, waitForControllersToBeActive),
})
syncPointReadyForCleanup = flow.NewTaskIDs(
initializeShootClients,
cleanExtendedAPIs,
deployControlPlane,
deployKubeControllerManager,
waitForControllersToBeActive,
)
cleanKubernetesResources = g.Add(flow.Task{
Name: "Cleaning Kubernetes resources",
Fn: flow.TaskFn(botanist.CleanKubernetesResources).Timeout(10 * time.Minute).DoIf(cleanupShootResources),
Dependencies: flow.NewTaskIDs(syncPointReadyForCleanup),
})
deleteMetricsServer = g.Add(flow.Task{
Name: "Deleting metrics-server",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.SystemComponents.MetricsServer.Destroy(ctx)
}).DoIf(cleanupShootResources).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointReadyForCleanup),
})
syncPointCleanedKubernetesResources = flow.NewTaskIDs(
cleanupWebhooks,
cleanExtendedAPIs,
cleanKubernetesResources,
deleteMetricsServer,
)
destroyNetwork = g.Add(flow.Task{
Name: "Destroying shoot network plugin",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.Network.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointCleanedKubernetesResources),
})
waitUntilNetworkIsDestroyed = g.Add(flow.Task{
Name: "Waiting until shoot network plugin has been destroyed",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.Network.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(destroyNetwork),
})
destroyWorker = g.Add(flow.Task{
Name: "Destroying shoot workers",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.Worker.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointCleanedKubernetesResources),
})
waitUntilWorkerDeleted = g.Add(flow.Task{
Name: "Waiting until shoot worker nodes have been terminated",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.Worker.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(destroyWorker),
})
deleteAllOperatingSystemConfigs = g.Add(flow.Task{
Name: "Deleting operating system config resources",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.OperatingSystemConfig.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(waitUntilWorkerDeleted),
})
_ = g.Add(flow.Task{
Name: "Waiting until all operating system config resources are deleted",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.OperatingSystemConfig.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless || o.Shoot.HibernationEnabled),
Dependencies: flow.NewTaskIDs(deleteAllOperatingSystemConfigs),
})
deleteManagedResources = g.Add(flow.Task{
Name: "Deleting managed resources",
Fn: flow.TaskFn(botanist.DeleteManagedResources).DoIf(cleanupShootResources).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointCleanedKubernetesResources, waitUntilWorkerDeleted),
})
waitUntilManagedResourcesDeleted = g.Add(flow.Task{
Name: "Waiting until managed resources have been deleted",
Fn: flow.TaskFn(botanist.WaitUntilManagedResourcesDeleted).DoIf(cleanupShootResources).Timeout(10 * time.Minute),
Dependencies: flow.NewTaskIDs(deleteManagedResources),
})
deleteExtensionResourcesBeforeKubeAPIServer = g.Add(flow.Task{
Name: "Deleting extension resources before kube-apiserver",
Fn: flow.TaskFn(botanist.Shoot.Components.Extensions.Extension.DestroyBeforeKubeAPIServer).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(cleanKubernetesResources, waitUntilManagedResourcesDeleted),
})
waitUntilExtensionResourcesBeforeKubeAPIServerDeleted = g.Add(flow.Task{
Name: "Waiting until extension resources that should be handled before kube-apiserver have been deleted",
Fn: botanist.Shoot.Components.Extensions.Extension.WaitCleanupBeforeKubeAPIServer,
Dependencies: flow.NewTaskIDs(deleteExtensionResourcesBeforeKubeAPIServer),
})
deleteStaleExtensionResources = g.Add(flow.Task{
Name: "Deleting stale extension resources",
Fn: flow.TaskFn(botanist.Shoot.Components.Extensions.Extension.DeleteStaleResources).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(cleanKubernetesResources, waitUntilManagedResourcesDeleted),
})
waitUntilStaleExtensionResourcesDeleted = g.Add(flow.Task{
Name: "Waiting until all stale extension resources have been deleted",
Fn: botanist.Shoot.Components.Extensions.Extension.WaitCleanupStaleResources,
Dependencies: flow.NewTaskIDs(deleteStaleExtensionResources),
})
deleteContainerRuntimeResources = g.Add(flow.Task{
Name: "Deleting container runtime resources",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ContainerRuntime.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(initializeShootClients, syncPointCleanedKubernetesResources),
})
waitUntilContainerRuntimeResourcesDeleted = g.Add(flow.Task{
Name: "Waiting until stale container runtime resources are deleted",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ContainerRuntime.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(deleteContainerRuntimeResources),
})
// Services (and other objects that have a footprint in the infrastructure) still don't have finalizers yet. There is no way to
// determine whether all the resources have been deleted successfully yet, whether there was an error, or whether they are still
// pending. While most providers have implemented custom clean up already (basically, duplicated the code in the CCM) not everybody
// has, especially not for all objects.
// Until service finalizers are enabled by default with Kubernetes 1.16 and our minimum supported seed version is raised to 1.16 we
// can not do much more than best-effort waiting until everything has been cleaned up. That's what the following task is doing.
timeForInfrastructureResourceCleanup = g.Add(flow.Task{
Name: "Waiting until time for infrastructure resource cleanup has elapsed",
Fn: flow.TaskFn(func(ctx context.Context) error {
waitFor := 5 * time.Minute
if v, ok := botanist.Shoot.GetInfo().Annotations[v1beta1constants.AnnotationShootInfrastructureCleanupWaitPeriodSeconds]; ok {
seconds, err := strconv.Atoi(v)
if err != nil {
return err
}
if newWaitFor := time.Duration(seconds) * time.Second; newWaitFor < waitFor {
waitFor = newWaitFor
}
}
ctx, cancel := context.WithTimeout(ctx, waitFor)
defer cancel()
<-ctx.Done()
return nil
}).DoIf(cleanupShootResources).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(deleteManagedResources),
})
syncPointCleaned = flow.NewTaskIDs(
syncPointCleanedKubernetesResources,
deleteAllOperatingSystemConfigs,
waitUntilWorkerDeleted,
waitUntilManagedResourcesDeleted,
timeForInfrastructureResourceCleanup,
destroyNetwork,
waitUntilNetworkIsDestroyed,
waitUntilExtensionResourcesBeforeKubeAPIServerDeleted,
waitUntilStaleExtensionResourcesDeleted,
waitUntilContainerRuntimeResourcesDeleted,
)
destroyControlPlane = g.Add(flow.Task{
Name: "Destroying shoot control plane",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ControlPlane.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointCleaned),
})
waitUntilControlPlaneDeleted = g.Add(flow.Task{
Name: "Waiting until shoot control plane has been destroyed",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ControlPlane.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(destroyControlPlane),
})
waitUntilShootManagedResourcesDeleted = g.Add(flow.Task{
Name: "Waiting until shoot managed resources have been deleted",
Fn: flow.TaskFn(botanist.WaitUntilShootManagedResourcesDeleted).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(waitUntilControlPlaneDeleted),
})
deleteKubeAPIServer = g.Add(flow.Task{
Name: "Deleting Kubernetes API server",
Fn: flow.TaskFn(botanist.DeleteKubeAPIServer).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointCleaned, waitUntilControlPlaneDeleted, waitUntilShootManagedResourcesDeleted),
})
waitUntilKubeAPIServerDeleted = g.Add(flow.Task{
Name: "Waiting until Kubernetes API server has been deleted",
Fn: botanist.Shoot.Components.ControlPlane.KubeAPIServer.WaitCleanup,
Dependencies: flow.NewTaskIDs(deleteKubeAPIServer),
})
deleteExtensionResourcesAfterKubeAPIServer = g.Add(flow.Task{
Name: "Deleting extension resources after kube-apiserver",
Fn: flow.TaskFn(botanist.Shoot.Components.Extensions.Extension.DestroyAfterKubeAPIServer).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted),
})
waitUntilExtensionResourcesAfterKubeAPIServerDeleted = g.Add(flow.Task{
Name: "Waiting until extension resources that should be handled after kube-apiserver have been deleted",
Fn: botanist.Shoot.Components.Extensions.Extension.WaitCleanupAfterKubeAPIServer,
Dependencies: flow.NewTaskIDs(deleteExtensionResourcesAfterKubeAPIServer),
})
// Add this step in interest of completeness. All extension deletions should have already been triggered by previous steps.
waitUntilExtensionResourcesDeleted = g.Add(flow.Task{
Name: "Waiting until all extension resources have been deleted",
Fn: botanist.Shoot.Components.Extensions.Extension.WaitCleanup,
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted),
})
destroyKubeAPIServerSNI = g.Add(flow.Task{
Name: "Destroying Kubernetes API server service SNI",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.KubeAPIServerSNI.Destroy).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted),
})
_ = g.Add(flow.Task{
Name: "Destroying Kubernetes API server ingress with trusted certificate",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.KubeAPIServerIngress.Destroy),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted),
})
_ = g.Add(flow.Task{
Name: "Destroying Kubernetes API server service",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.KubeAPIServerService.Destroy).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted, destroyKubeAPIServerSNI),
})
_ = g.Add(flow.Task{
Name: "Destroying gardener-resource-manager",
Fn: flow.TaskFn(botanist.Shoot.Components.ControlPlane.ResourceManager.Destroy),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted),
})
destroyControlPlaneExposure = g.Add(flow.Task{
Name: "Destroying shoot control plane exposure",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ControlPlaneExposure.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(waitUntilKubeAPIServerDeleted),
})
waitUntilControlPlaneExposureDeleted = g.Add(flow.Task{
Name: "Waiting until shoot control plane exposure has been destroyed",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.ControlPlaneExposure.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(destroyControlPlaneExposure),
})
destroyIngressDomainDNSRecord = g.Add(flow.Task{
Name: "Destroying nginx ingress DNS record",
Fn: flow.TaskFn(botanist.DestroyIngressDNSRecord).DoIf(nonTerminatingNamespace).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(syncPointCleaned),
})
deleteInfrastructure = g.Add(flow.Task{
Name: "Destroying shoot infrastructure",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.Infrastructure.Destroy(ctx)
}).SkipIf(o.Shoot.IsWorkerless).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPointCleaned, waitUntilControlPlaneDeleted),
})
waitUntilInfrastructureDeleted = g.Add(flow.Task{
Name: "Waiting until shoot infrastructure has been deleted",
Fn: flow.TaskFn(func(ctx context.Context) error {
return botanist.Shoot.Components.Extensions.Infrastructure.WaitCleanup(ctx)
}).SkipIf(o.Shoot.IsWorkerless),
Dependencies: flow.NewTaskIDs(deleteInfrastructure),
})
destroyExternalDomainDNSRecord = g.Add(flow.Task{
Name: "Destroying external domain DNS record",
Fn: flow.TaskFn(botanist.DestroyExternalDNSRecord).DoIf(nonTerminatingNamespace),
Dependencies: flow.NewTaskIDs(syncPointCleaned, waitUntilKubeAPIServerDeleted),
})
deletePlutono = g.Add(flow.Task{
Name: "Deleting Plutono in Seed",
Fn: flow.TaskFn(botanist.DeletePlutono).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(waitUntilInfrastructureDeleted),
})
syncPoint = flow.NewTaskIDs(
deleteSeedMonitoring,
deletePlutono,
waitUntilKubeAPIServerDeleted,
waitUntilControlPlaneDeleted,
waitUntilControlPlaneExposureDeleted,
waitUntilExtensionResourcesAfterKubeAPIServerDeleted,
waitUntilExtensionResourcesDeleted,
destroyIngressDomainDNSRecord,
destroyExternalDomainDNSRecord,
waitUntilInfrastructureDeleted,
)
destroyInternalDomainDNSRecord = g.Add(flow.Task{
Name: "Destroying internal domain DNS record",
Fn: flow.TaskFn(botanist.DestroyInternalDNSRecord).DoIf(nonTerminatingNamespace),
Dependencies: flow.NewTaskIDs(syncPoint),
})
destroyOwnerDomainDNSRecord = g.Add(flow.Task{
Name: "Destroying owner domain DNS record",
Fn: flow.TaskFn(botanist.DestroyOwnerDNSResources).DoIf(nonTerminatingNamespace),
Dependencies: flow.NewTaskIDs(syncPoint),
})
destroyReferencedResources = g.Add(flow.Task{
Name: "Deleting referenced resources",
Fn: flow.TaskFn(botanist.DestroyReferencedResources).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPoint),
})
destroyEtcd = g.Add(flow.Task{
Name: "Destroying main and events etcd",
Fn: flow.TaskFn(botanist.DestroyEtcd).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPoint),
})
waitUntilEtcdDeleted = g.Add(flow.Task{
Name: "Waiting until main and event etcd have been destroyed",
Fn: flow.TaskFn(botanist.WaitUntilEtcdsDeleted).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPoint, destroyEtcd),
})
deleteNamespace = g.Add(flow.Task{
Name: "Deleting shoot namespace in Seed",
Fn: flow.TaskFn(botanist.DeleteSeedNamespace).RetryUntilTimeout(defaultInterval, defaultTimeout),
Dependencies: flow.NewTaskIDs(syncPoint, destroyInternalDomainDNSRecord, destroyOwnerDomainDNSRecord, destroyReferencedResources, waitUntilEtcdDeleted),
})
_ = g.Add(flow.Task{
Name: "Waiting until shoot namespace in Seed has been deleted",
Fn: botanist.WaitUntilSeedNamespaceDeleted,
Dependencies: flow.NewTaskIDs(deleteNamespace),
})
_ = g.Add(flow.Task{
Name: "Deleting Shoot State",
Fn: botanist.DeleteShootState,
Dependencies: flow.NewTaskIDs(deleteNamespace),
})
f = g.Compile()
)
if err := f.Run(ctx, flow.Opts{
Log: o.Logger,
ProgressReporter: r.newProgressReporter(o.ReportShootProgress),
ErrorCleaner: o.CleanShootTaskError,
ErrorContext: errorContext,
}); err != nil {
return v1beta1helper.NewWrappedLastErrors(v1beta1helper.FormatLastErrDescription(err), flow.Errors(err))
}
// ensure that shoot client is invalidated after it has been deleted
if err := o.ShootClientMap.InvalidateClient(keys.ForShoot(o.Shoot.GetInfo())); err != nil {
err = fmt.Errorf("failed to invalidate shoot client: %w", err)
return v1beta1helper.NewWrappedLastErrors(v1beta1helper.FormatLastErrDescription(err), err)
}
o.Logger.Info("Successfully deleted Shoot cluster")
return nil
}