/
actuator_delete.go
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/
actuator_delete.go
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// Copyright (c) 2019 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 genericactuator
import (
"context"
"fmt"
"strings"
"sync"
"time"
"github.com/gardener/gardener/extensions/pkg/controller"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
retryutils "github.com/gardener/gardener/pkg/utils/retry"
machinev1alpha1 "github.com/gardener/machine-controller-manager/pkg/apis/machine/v1alpha1"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/api/meta"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
forceDeletionLabelKey = "force-deletion"
forceDeletionLabelValue = "True"
)
func (a *genericActuator) Delete(ctx context.Context, worker *extensionsv1alpha1.Worker, cluster *controller.Cluster) error {
workerDelegate, err := a.delegateFactory.WorkerDelegate(ctx, worker, cluster)
if err != nil {
return errors.Wrapf(err, "could not instantiate actuator context")
}
// Make sure machine-controller-manager is awake before deleting the machines.
var replicaFunc = func() (int32, error) {
return 1, nil
}
// Deploy the machine-controller-manager into the cluster to make sure worker nodes can be removed.
a.logger.Info("Deploying the machine-controller-manager", "worker", fmt.Sprintf("%s/%s", worker.Namespace, worker.Name))
if err := a.deployMachineControllerManager(ctx, worker, cluster, workerDelegate, replicaFunc); err != nil {
return err
}
// Redeploy generated machine classes to update credentials machine-controller-manager used.
a.logger.Info("Deploying the machine classes", "worker", fmt.Sprintf("%s/%s", worker.Namespace, worker.Name))
if err := workerDelegate.DeployMachineClasses(ctx); err != nil {
return errors.Wrapf(err, "failed to deploy the machine classes")
}
// Mark all existing machines to become forcefully deleted.
a.logger.Info("Deleting all machines", "worker", fmt.Sprintf("%s/%s", worker.Namespace, worker.Name))
if err := a.markAllMachinesForcefulDeletion(ctx, worker.Namespace); err != nil {
return errors.Wrapf(err, "marking all machines for forceful deletion failed")
}
// Get the list of all existing machine deployments.
existingMachineDeployments := &machinev1alpha1.MachineDeploymentList{}
if err := a.client.List(ctx, existingMachineDeployments, client.InNamespace(worker.Namespace)); err != nil {
return err
}
// Delete all machine deployments.
if err := a.cleanupMachineDeployments(ctx, existingMachineDeployments, nil); err != nil {
return errors.Wrapf(err, "cleaning up machine deployments failed")
}
// Delete all machine classes.
if err := a.cleanupMachineClasses(ctx, worker.Namespace, workerDelegate.MachineClassList(), nil); err != nil {
return errors.Wrapf(err, "cleaning up machine classes failed")
}
// Delete all machine class secrets.
if err := a.cleanupMachineClassSecrets(ctx, worker.Namespace, nil); err != nil {
return errors.Wrapf(err, "cleaning up machine class secrets failed")
}
// Wait until all machine resources have been properly deleted.
if err := a.waitUntilMachineResourcesDeleted(ctx, worker, workerDelegate); err != nil {
return gardencorev1beta1helper.DetermineError(err, fmt.Sprintf("Failed while waiting for all machine resources to be deleted: '%s'", err.Error()))
}
// Delete the machine-controller-manager.
if err := a.deleteMachineControllerManager(ctx, worker); err != nil {
return errors.Wrapf(err, "failed deleting machine-controller-manager")
}
return nil
}
// Mark all existing machines to become forcefully deleted.
func (a *genericActuator) markAllMachinesForcefulDeletion(ctx context.Context, namespace string) error {
// Mark all existing machines to become forcefully deleted.
existingMachines := &machinev1alpha1.MachineList{}
if err := a.client.List(ctx, existingMachines, client.InNamespace(namespace)); err != nil {
return err
}
var (
errorList []error
wg sync.WaitGroup
)
// TODO: Use github.com/gardener/gardener/pkg/utils/flow.Parallel as soon as we can vendor a new Gardener version again.
for _, machine := range existingMachines.Items {
wg.Add(1)
go func(m machinev1alpha1.Machine) {
defer wg.Done()
if err := a.markMachineForcefulDeletion(ctx, &m); err != nil {
errorList = append(errorList, err)
}
}(machine)
}
wg.Wait()
if len(errorList) > 0 {
return fmt.Errorf("labelling machines (to become forcefully deleted) failed: %v", errorList)
}
return nil
}
// markMachineForcefulDeletion labels a machine object to become forcefully deleted.
func (a *genericActuator) markMachineForcefulDeletion(ctx context.Context, machine *machinev1alpha1.Machine) error {
if machine.Labels == nil {
machine.Labels = map[string]string{}
}
if val, ok := machine.Labels[forceDeletionLabelKey]; ok && val == forceDeletionLabelValue {
return nil
}
machine.Labels[forceDeletionLabelKey] = forceDeletionLabelValue
return a.client.Update(ctx, machine)
}
// waitUntilMachineResourcesDeleted waits for a maximum of 30 minutes until all machine resources have been properly
// deleted by the machine-controller-manager. It polls the status every 5 seconds.
// TODO: Parallelise this?
func (a *genericActuator) waitUntilMachineResourcesDeleted(ctx context.Context, worker *extensionsv1alpha1.Worker, workerDelegate WorkerDelegate) error {
var (
countMachines = -1
countMachineSets = -1
countMachineDeployments = -1
countMachineClasses = -1
countMachineClassSecrets = -1
)
return retryutils.UntilTimeout(ctx, 5*time.Second, 5*time.Minute, func(ctx context.Context) (bool, error) {
msg := ""
// Check whether all machines have been deleted.
if countMachines != 0 {
existingMachines := &machinev1alpha1.MachineList{}
if err := a.client.List(ctx, existingMachines, client.InNamespace(worker.Namespace)); err != nil {
return retryutils.SevereError(err)
}
countMachines = len(existingMachines.Items)
msg += fmt.Sprintf("%d machines, ", countMachines)
}
// Check whether all machine sets have been deleted.
if countMachineSets != 0 {
existingMachineSets := &machinev1alpha1.MachineSetList{}
if err := a.client.List(ctx, existingMachineSets, client.InNamespace(worker.Namespace)); err != nil {
return retryutils.SevereError(err)
}
countMachineSets = len(existingMachineSets.Items)
msg += fmt.Sprintf("%d machine sets, ", countMachineSets)
}
// Check whether all machine deployments have been deleted.
if countMachineDeployments != 0 {
existingMachineDeployments := &machinev1alpha1.MachineDeploymentList{}
if err := a.client.List(ctx, existingMachineDeployments, client.InNamespace(worker.Namespace)); err != nil {
return retryutils.SevereError(err)
}
countMachineDeployments = len(existingMachineDeployments.Items)
msg += fmt.Sprintf("%d machine deployments, ", countMachineDeployments)
// Check whether an operation failed during the deletion process.
for _, existingMachineDeployment := range existingMachineDeployments.Items {
for _, failedMachine := range existingMachineDeployment.Status.FailedMachines {
return retryutils.SevereError(fmt.Errorf("machine %s failed: %s", failedMachine.Name, failedMachine.LastOperation.Description))
}
}
}
// Check whether all machine classes have been deleted.
if countMachineClasses != 0 {
machineClassList := workerDelegate.MachineClassList()
if err := a.client.List(ctx, machineClassList, client.InNamespace(worker.Namespace)); err != nil {
return retryutils.SevereError(err)
}
machineClasses, err := meta.ExtractList(machineClassList)
if err != nil {
return retryutils.SevereError(err)
}
countMachineClasses = len(machineClasses)
msg += fmt.Sprintf("%d machine classes, ", countMachineClasses)
}
// Check whether all machine class secrets have been deleted.
if countMachineClassSecrets != 0 {
count := 0
existingMachineClassSecrets, err := a.listMachineClassSecrets(ctx, worker.Namespace)
if err != nil {
return retryutils.SevereError(err)
}
for _, machineClassSecret := range existingMachineClassSecrets.Items {
if len(machineClassSecret.Finalizers) != 0 {
count++
}
}
countMachineClassSecrets = count
msg += fmt.Sprintf("%d machine class secrets, ", countMachineClassSecrets)
}
if countMachines != 0 || countMachineSets != 0 || countMachineDeployments != 0 || countMachineClasses != 0 || countMachineClassSecrets != 0 {
msg := fmt.Sprintf("Waiting until the following machine resources have been deleted: %s", strings.TrimSuffix(msg, ", "))
a.logger.Info(msg, "worker", fmt.Sprintf("%s/%s", worker.Namespace, worker.Name))
return retryutils.MinorError(errors.New(msg))
}
return retryutils.Ok()
})
}