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shootsystem.go
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shootsystem.go
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// Copyright (c) 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 shootsystem
import (
"context"
"time"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/utils/managedresources"
versionutils "github.com/gardener/gardener/pkg/utils/version"
"github.com/Masterminds/semver"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
// ManagedResourceName is the name of the ManagedResource containing the resource specifications.
ManagedResourceName = "shoot-core-system"
)
// Values is a set of configuration values for the system resources.
type Values struct {
// KubernetesVersion is the Kubernetes version of the shoot cluster.
KubernetesVersion *semver.Version
}
// New creates a new instance of DeployWaiter for shoot system resources.
func New(
client client.Client,
namespace string,
values Values,
) component.DeployWaiter {
return &shootSystem{
client: client,
namespace: namespace,
values: values,
}
}
type shootSystem struct {
client client.Client
namespace string
values Values
}
func (s *shootSystem) Deploy(ctx context.Context) error {
data, err := s.computeResourcesData()
if err != nil {
return err
}
return managedresources.CreateForShoot(ctx, s.client, s.namespace, ManagedResourceName, false, data)
}
func (s *shootSystem) Destroy(ctx context.Context) error {
return managedresources.DeleteForShoot(ctx, s.client, s.namespace, ManagedResourceName)
}
// TimeoutWaitForManagedResource is the timeout used while waiting for the ManagedResources to become healthy
// or deleted.
var TimeoutWaitForManagedResource = 2 * time.Minute
func (s *shootSystem) Wait(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilHealthy(timeoutCtx, s.client, s.namespace, ManagedResourceName)
}
func (s *shootSystem) WaitCleanup(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilDeleted(timeoutCtx, s.client, s.namespace, ManagedResourceName)
}
func (s *shootSystem) computeResourcesData() (map[string][]byte, error) {
var (
registry = managedresources.NewRegistry(kubernetes.ShootScheme, kubernetes.ShootCodec, kubernetes.ShootSerializer)
kubeControllerManagerServiceAccounts []client.Object
)
for _, name := range s.getServiceAccountNamesToInvalidate() {
kubeControllerManagerServiceAccounts = append(kubeControllerManagerServiceAccounts, &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: metav1.NamespaceSystem,
Annotations: map[string]string{resourcesv1alpha1.KeepObject: "true"},
},
AutomountServiceAccountToken: pointer.Bool(false),
})
}
return registry.AddAllAndSerialize(kubeControllerManagerServiceAccounts...)
}
func (s *shootSystem) getServiceAccountNamesToInvalidate() []string {
// Well-known {kube,cloud}-controller-manager controllers using a token for ServiceAccounts in the shoot
// To maintain this list for each new Kubernetes version:
// * Run hack/compare-k8s-controllers.sh <old-version> <new-version> (e.g. 'hack/compare-k8s-controllers.sh 1.22 1.23').
// It will present 2 lists of controllers: those added and those removed in <new-version> compared to <old-version>.
// * Double check whether such ServiceAccount indeed appears in the kube-system namespace when creating a cluster
// with <new-version>. Note that it sometimes might be hidden behind a default-off feature gate.
// If it appears, add all added controllers to the list if the Kubernetes version is high enough.
// * For any removed controllers, add them only to the Kubernetes version if it is low enough.
kubeControllerManagerServiceAccountNames := []string{
"attachdetach-controller",
"bootstrap-signer",
"certificate-controller",
"clusterrole-aggregation-controller",
"controller-discovery",
"cronjob-controller",
"daemon-set-controller",
"deployment-controller",
"disruption-controller",
"endpoint-controller",
"endpointslice-controller",
"expand-controller",
"generic-garbage-collector",
"horizontal-pod-autoscaler",
"job-controller",
"metadata-informers",
"namespace-controller",
"persistent-volume-binder",
"pod-garbage-collector",
"pv-protection-controller",
"pvc-protection-controller",
"replicaset-controller",
"replication-controller",
"resourcequota-controller",
"root-ca-cert-publisher",
"service-account-controller",
"shared-informers",
"statefulset-controller",
"token-cleaner",
"tokens-controller",
"ttl-after-finished-controller",
"ttl-controller",
}
if versionutils.ConstraintK8sGreaterEqual119.Check(s.values.KubernetesVersion) {
kubeControllerManagerServiceAccountNames = append(kubeControllerManagerServiceAccountNames,
"endpointslicemirroring-controller",
"ephemeral-volume-controller",
)
}
if versionutils.ConstraintK8sGreaterEqual120.Check(s.values.KubernetesVersion) {
kubeControllerManagerServiceAccountNames = append(kubeControllerManagerServiceAccountNames,
"storage-version-garbage-collector",
)
}
// The cloud-controller-manager library was only adapted beginning with Kubernetes 1.21 to not rely on the static
// ServiceAccount secrets anymore. Prior versions still need them, so let's add the ServiceAccount names for
// controllers which are part of cloud-controller-managers only for 1.21+.
// See https://github.com/kubernetes/kubernetes/pull/99291 for more details.
if versionutils.ConstraintK8sGreaterEqual121.Check(s.values.KubernetesVersion) {
kubeControllerManagerServiceAccountNames = append(kubeControllerManagerServiceAccountNames,
"node-controller",
"route-controller",
"service-controller",
)
}
return append(kubeControllerManagerServiceAccountNames, "default")
}