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shootsystem.go
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shootsystem.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 shootsystem
import (
"context"
"fmt"
"slices"
"strings"
"time"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
schedulingv1 "k8s.io/api/scheduling/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/component"
corednsconstants "github.com/gardener/gardener/pkg/component/coredns/constants"
kubeapiserverconstants "github.com/gardener/gardener/pkg/component/kubeapiserver/constants"
nodelocaldnsconstants "github.com/gardener/gardener/pkg/component/nodelocaldns/constants"
shootpkg "github.com/gardener/gardener/pkg/operation/shoot"
"github.com/gardener/gardener/pkg/utils/managedresources"
versionutils "github.com/gardener/gardener/pkg/utils/version"
)
// ManagedResourceName is the name of the ManagedResource containing the resource specifications.
const ManagedResourceName = "shoot-core-system"
// Values is a set of configuration values for the system resources.
type Values struct {
// ProjectName is the name of the project of the shoot cluster.
ProjectName string
// Shoot is an object containing information about the shoot cluster.
Shoot *shootpkg.Shoot
}
// 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, managedresources.LabelValueGardener, 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)
shootInfoConfigMap = &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.ConfigMapNameShootInfo,
Namespace: metav1.NamespaceSystem,
},
Data: s.shootInfoData(),
}
port53 = intstr.FromInt(53)
port443 = intstr.FromInt(kubeapiserverconstants.Port)
port8053 = intstr.FromInt(corednsconstants.PortServer)
port10250 = intstr.FromInt(10250)
protocolUDP = corev1.ProtocolUDP
protocolTCP = corev1.ProtocolTCP
networkPolicyAllowToShootAPIServer = &networkingv1.NetworkPolicy{
ObjectMeta: metav1.ObjectMeta{
Name: "gardener.cloud--allow-to-apiserver",
Namespace: metav1.NamespaceSystem,
Annotations: map[string]string{
v1beta1constants.GardenerDescription: fmt.Sprintf("Allows traffic to the API server in TCP "+
"port 443 for pods labeled with '%s=%s'.", v1beta1constants.LabelNetworkPolicyShootToAPIServer,
v1beta1constants.LabelNetworkPolicyAllowed),
},
},
Spec: networkingv1.NetworkPolicySpec{
PodSelector: metav1.LabelSelector{MatchLabels: map[string]string{v1beta1constants.LabelNetworkPolicyShootToAPIServer: v1beta1constants.LabelNetworkPolicyAllowed}},
Egress: []networkingv1.NetworkPolicyEgressRule{{Ports: []networkingv1.NetworkPolicyPort{{Port: &port443, Protocol: &protocolTCP}}}},
PolicyTypes: []networkingv1.PolicyType{networkingv1.PolicyTypeEgress},
},
}
networkPolicyAllowToDNS = &networkingv1.NetworkPolicy{
ObjectMeta: metav1.ObjectMeta{
Name: "gardener.cloud--allow-to-dns",
Namespace: metav1.NamespaceSystem,
Annotations: map[string]string{
v1beta1constants.GardenerDescription: fmt.Sprintf("Allows egress traffic from pods labeled "+
"with '%s=%s' to DNS running in the '%s' namespace.", v1beta1constants.LabelNetworkPolicyToDNS,
v1beta1constants.LabelNetworkPolicyAllowed, metav1.NamespaceSystem),
},
},
Spec: networkingv1.NetworkPolicySpec{
PodSelector: metav1.LabelSelector{MatchLabels: map[string]string{v1beta1constants.LabelNetworkPolicyToDNS: v1beta1constants.LabelNetworkPolicyAllowed}},
PolicyTypes: []networkingv1.PolicyType{networkingv1.PolicyTypeEgress},
Egress: []networkingv1.NetworkPolicyEgressRule{
{
To: []networkingv1.NetworkPolicyPeer{{
PodSelector: &metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{{
Key: corednsconstants.LabelKey,
Operator: metav1.LabelSelectorOpIn,
Values: []string{corednsconstants.LabelValue},
}},
},
}},
Ports: []networkingv1.NetworkPolicyPort{
{Protocol: &protocolUDP, Port: &port8053},
{Protocol: &protocolTCP, Port: &port8053},
},
},
// this allows Pods with 'dnsPolicy: Default' to talk to the node's DNS provider.
{
To: []networkingv1.NetworkPolicyPeer{
{
IPBlock: &networkingv1.IPBlock{CIDR: "0.0.0.0/0"},
},
{
PodSelector: &metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{{
Key: corednsconstants.LabelKey,
Operator: metav1.LabelSelectorOpIn,
Values: []string{nodelocaldnsconstants.LabelValue},
}},
},
},
},
Ports: []networkingv1.NetworkPolicyPort{
{Protocol: &protocolUDP, Port: &port53},
{Protocol: &protocolTCP, Port: &port53},
},
},
},
},
}
networkPolicyAllowToKubelet = &networkingv1.NetworkPolicy{
ObjectMeta: metav1.ObjectMeta{
Name: "gardener.cloud--allow-to-kubelet",
Namespace: metav1.NamespaceSystem,
Annotations: map[string]string{
v1beta1constants.GardenerDescription: fmt.Sprintf("Allows egress traffic to kubelet in TCP "+
"port 10250 for pods labeled with '%s=%s'.", v1beta1constants.LabelNetworkPolicyShootToKubelet,
v1beta1constants.LabelNetworkPolicyAllowed),
},
},
Spec: networkingv1.NetworkPolicySpec{
PodSelector: metav1.LabelSelector{MatchLabels: map[string]string{v1beta1constants.LabelNetworkPolicyShootToKubelet: v1beta1constants.LabelNetworkPolicyAllowed}},
Egress: []networkingv1.NetworkPolicyEgressRule{{Ports: []networkingv1.NetworkPolicyPort{{Port: &port10250, Protocol: &protocolTCP}}}},
PolicyTypes: []networkingv1.PolicyType{networkingv1.PolicyTypeEgress},
},
}
networkPolicyAllowToPublicNetworks = &networkingv1.NetworkPolicy{
ObjectMeta: metav1.ObjectMeta{
Name: "gardener.cloud--allow-to-public-networks",
Namespace: metav1.NamespaceSystem,
Annotations: map[string]string{
v1beta1constants.GardenerDescription: fmt.Sprintf("Allows egress traffic to all networks for "+
"pods labeled with '%s=%s'.", v1beta1constants.LabelNetworkPolicyToPublicNetworks,
v1beta1constants.LabelNetworkPolicyAllowed),
},
},
Spec: networkingv1.NetworkPolicySpec{
PodSelector: metav1.LabelSelector{MatchLabels: map[string]string{v1beta1constants.LabelNetworkPolicyToPublicNetworks: v1beta1constants.LabelNetworkPolicyAllowed}},
Egress: []networkingv1.NetworkPolicyEgressRule{{To: []networkingv1.NetworkPolicyPeer{{IPBlock: &networkingv1.IPBlock{CIDR: "0.0.0.0/0"}}}}},
PolicyTypes: []networkingv1.PolicyType{networkingv1.PolicyTypeEgress},
},
}
)
for _, name := range s.getServiceAccountNamesToInvalidate() {
if err := registry.Add(&corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: metav1.NamespaceSystem,
Annotations: map[string]string{resourcesv1alpha1.KeepObject: "true"},
},
AutomountServiceAccountToken: pointer.Bool(false),
}); err != nil {
return nil, err
}
}
if err := addPriorityClasses(registry); err != nil {
return nil, err
}
return registry.AddAllAndSerialize(
shootInfoConfigMap,
networkPolicyAllowToShootAPIServer,
networkPolicyAllowToDNS,
networkPolicyAllowToKubelet,
networkPolicyAllowToPublicNetworks,
)
}
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",
"endpointslicemirroring-controller",
"ephemeral-volume-controller",
"storage-version-garbage-collector",
"node-controller",
"route-controller",
"service-controller",
}
if versionutils.ConstraintK8sGreaterEqual126.Check(s.values.Shoot.KubernetesVersion) {
kubeControllerManagerServiceAccountNames = append(kubeControllerManagerServiceAccountNames,
"resource-claim-controller")
}
if versionutils.ConstraintK8sGreaterEqual128.Check(s.values.Shoot.KubernetesVersion) {
kubeControllerManagerServiceAccountNames = append(kubeControllerManagerServiceAccountNames,
"legacy-service-account-token-cleaner",
"validatingadmissionpolicy-status-controller",
)
}
return append(kubeControllerManagerServiceAccountNames, "default")
}
// remember to update docs/development/priority-classes.md when making changes here
var gardenletManagedPriorityClasses = []struct {
name string
value int32
description string
}{
{v1beta1constants.PriorityClassNameShootSystem900, 999999900, "PriorityClass for Shoot system components"},
{v1beta1constants.PriorityClassNameShootSystem800, 999999800, "PriorityClass for Shoot system components"},
{v1beta1constants.PriorityClassNameShootSystem700, 999999700, "PriorityClass for Shoot system components"},
{v1beta1constants.PriorityClassNameShootSystem600, 999999600, "PriorityClass for Shoot system components"},
}
func addPriorityClasses(registry *managedresources.Registry) error {
for _, class := range gardenletManagedPriorityClasses {
if err := registry.Add(&schedulingv1.PriorityClass{
ObjectMeta: metav1.ObjectMeta{
Name: class.name,
},
Description: class.description,
GlobalDefault: false,
Value: class.value,
}); err != nil {
return err
}
}
return nil
}
func (s *shootSystem) shootInfoData() map[string]string {
data := map[string]string{
"projectName": s.values.ProjectName,
"shootName": s.values.Shoot.GetInfo().Name,
"provider": s.values.Shoot.GetInfo().Spec.Provider.Type,
"region": s.values.Shoot.GetInfo().Spec.Region,
"kubernetesVersion": s.values.Shoot.GetInfo().Spec.Kubernetes.Version,
"podNetwork": s.values.Shoot.Networks.Pods.String(),
"serviceNetwork": s.values.Shoot.Networks.Services.String(),
"maintenanceBegin": s.values.Shoot.GetInfo().Spec.Maintenance.TimeWindow.Begin,
"maintenanceEnd": s.values.Shoot.GetInfo().Spec.Maintenance.TimeWindow.End,
}
if domain := s.values.Shoot.ExternalClusterDomain; domain != nil {
data["domain"] = *domain
}
if nodeNetwork := s.values.Shoot.GetInfo().Spec.Networking.Nodes; nodeNetwork != nil {
data["nodeNetwork"] = *nodeNetwork
}
extensions := make([]string, 0, len(s.values.Shoot.Components.Extensions.Extension.Extensions()))
for extensionType := range s.values.Shoot.Components.Extensions.Extension.Extensions() {
extensions = append(extensions, extensionType)
}
slices.Sort(extensions)
data["extensions"] = strings.Join(extensions, ",")
return data
}