/
controlplane.go
1338 lines (1159 loc) · 49.7 KB
/
controlplane.go
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// Copyright (c) 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 botanist
import (
"context"
"errors"
"fmt"
"hash/crc32"
"path/filepath"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "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"
"github.com/gardener/gardener/pkg/features"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/flow"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/kubernetes/health"
"github.com/gardener/gardener/pkg/utils/retry"
"github.com/gardener/gardener/pkg/utils/version"
"k8s.io/apimachinery/pkg/types"
druidv1alpha1 "github.com/gardener/etcd-druid/api/v1alpha1"
hvpav1alpha1 "github.com/gardener/hvpa-controller/api/v1alpha1"
"github.com/sirupsen/logrus"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/util/sets"
audit_internal "k8s.io/apiserver/pkg/apis/audit"
auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
auditv1alpha1 "k8s.io/apiserver/pkg/apis/audit/v1alpha1"
auditv1beta1 "k8s.io/apiserver/pkg/apis/audit/v1beta1"
auditvalidation "k8s.io/apiserver/pkg/apis/audit/validation"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
var chartPathControlPlane = filepath.Join(common.ChartPath, "seed-controlplane", "charts")
// DeployNamespace creates a namespace in the Seed cluster which is used to deploy all the control plane
// components for the Shoot cluster. Moreover, the cloud provider configuration and all the secrets will be
// stored as ConfigMaps/Secrets.
func (b *Botanist) DeployNamespace(ctx context.Context) error {
namespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: b.Shoot.SeedNamespace,
},
}
if _, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), namespace, func() error {
namespace.Annotations = map[string]string{
v1beta1constants.DeprecatedShootUID: string(b.Shoot.Info.Status.UID),
}
namespace.Labels = map[string]string{
v1beta1constants.DeprecatedGardenRole: v1beta1constants.GardenRoleShoot,
v1beta1constants.GardenRole: v1beta1constants.GardenRoleShoot,
v1beta1constants.LabelSeedProvider: string(b.Seed.Info.Spec.Provider.Type),
v1beta1constants.LabelShootProvider: string(b.Shoot.Info.Spec.Provider.Type),
v1beta1constants.LabelNetworkingProvider: string(b.Shoot.Info.Spec.Networking.Type),
v1beta1constants.LabelBackupProvider: string(b.Seed.Info.Spec.Provider.Type),
}
if b.Seed.Info.Spec.Backup != nil {
namespace.Labels[v1beta1constants.LabelBackupProvider] = string(b.Seed.Info.Spec.Backup.Provider)
}
return nil
}); err != nil {
return err
}
b.SeedNamespaceObject = namespace
return nil
}
// DeleteNamespace deletes the namespace in the Seed cluster which holds the control plane components. The built-in
// garbage collection in Kubernetes will automatically delete all resources which belong to this namespace. This
// comprises volumes and load balancers as well.
func (b *Botanist) DeleteNamespace(ctx context.Context) error {
return b.deleteNamespace(ctx, b.Shoot.SeedNamespace)
}
func (b *Botanist) deleteNamespace(ctx context.Context, name string) error {
namespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: name,
},
}
err := b.K8sSeedClient.Client().Delete(ctx, namespace, kubernetes.DefaultDeleteOptions...)
if apierrors.IsNotFound(err) || apierrors.IsConflict(err) {
return nil
}
return err
}
// DeleteKubeAPIServer deletes the kube-apiserver deployment in the Seed cluster which holds the Shoot's control plane.
func (b *Botanist) DeleteKubeAPIServer(ctx context.Context) error {
deploy := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.DeploymentNameKubeAPIServer,
Namespace: b.Shoot.SeedNamespace,
},
}
return client.IgnoreNotFound(b.K8sSeedClient.Client().Delete(ctx, deploy, kubernetes.DefaultDeleteOptions...))
}
// DeployClusterAutoscaler deploys the cluster-autoscaler into the Shoot namespace in the Seed cluster. It is responsible
// for automatically scaling the worker pools of the Shoot.
func (b *Botanist) DeployClusterAutoscaler(ctx context.Context) error {
if !b.Shoot.WantsClusterAutoscaler {
return b.DeleteClusterAutoscaler(ctx)
}
var workerPools []map[string]interface{}
for _, worker := range b.Shoot.MachineDeployments {
workerPools = append(workerPools, map[string]interface{}{
"name": worker.Name,
"min": worker.Minimum,
"max": worker.Maximum,
})
}
defaultValues := map[string]interface{}{
"podAnnotations": map[string]interface{}{
"checksum/secret-cluster-autoscaler": b.CheckSums[v1beta1constants.DeploymentNameClusterAutoscaler],
},
"namespace": map[string]interface{}{
"uid": b.SeedNamespaceObject.UID,
},
"replicas": b.Shoot.GetReplicas(1),
"workerPools": workerPools,
}
if clusterAutoscalerConfig := b.Shoot.Info.Spec.Kubernetes.ClusterAutoscaler; clusterAutoscalerConfig != nil {
if val := clusterAutoscalerConfig.ScaleDownUtilizationThreshold; val != nil {
defaultValues["scaleDownUtilizationThreshold"] = *val
}
if val := clusterAutoscalerConfig.ScaleDownUnneededTime; val != nil {
defaultValues["scaleDownUnneededTime"] = *val
}
if val := clusterAutoscalerConfig.ScaleDownDelayAfterAdd; val != nil {
defaultValues["scaleDownDelayAfterAdd"] = *val
}
if val := clusterAutoscalerConfig.ScaleDownDelayAfterFailure; val != nil {
defaultValues["scaleDownDelayAfterFailure"] = *val
}
if val := clusterAutoscalerConfig.ScaleDownDelayAfterDelete; val != nil {
defaultValues["scaleDownDelayAfterDelete"] = *val
}
if val := clusterAutoscalerConfig.ScanInterval; val != nil {
defaultValues["scanInterval"] = *val
}
}
values, err := b.InjectSeedShootImages(defaultValues, common.ClusterAutoscalerImageName)
if err != nil {
return err
}
return b.ChartApplierSeed.Apply(ctx, filepath.Join(chartPathControlPlane, v1beta1constants.DeploymentNameClusterAutoscaler), b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameClusterAutoscaler, kubernetes.Values(values))
}
// DeleteClusterAutoscaler deletes the cluster-autoscaler deployment in the Seed cluster which holds the Shoot's control plane.
func (b *Botanist) DeleteClusterAutoscaler(ctx context.Context) error {
deploy := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.DeploymentNameClusterAutoscaler,
Namespace: b.Shoot.SeedNamespace,
},
}
return client.IgnoreNotFound(b.K8sSeedClient.Client().Delete(ctx, deploy, kubernetes.DefaultDeleteOptions...))
}
// WakeUpControlPlane scales the replicas to 1 for the following deployments which are needed in case of shoot deletion:
// * etcd-events
// * etcd-main
// * kube-apiserver
// * kube-controller-manager
func (b *Botanist) WakeUpControlPlane(ctx context.Context) error {
client := b.K8sSeedClient.Client()
for _, etcd := range []string{v1beta1constants.ETCDEvents, v1beta1constants.ETCDMain} {
if err := kubernetes.ScaleEtcd(ctx, client, kutil.Key(b.Shoot.SeedNamespace, etcd), 1); err != nil {
return err
}
}
if err := b.WaitUntilEtcdReady(ctx); err != nil {
return err
}
if err := b.DeployKubeAPIServerService(ctx); err != nil {
return err
}
if err := b.WaitUntilKubeAPIServerServiceIsReady(ctx); err != nil {
return err
}
if err := kubernetes.ScaleDeployment(ctx, client, kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1); err != nil {
return err
}
if err := b.WaitUntilKubeAPIServerReady(ctx); err != nil {
return err
}
for _, deployment := range []string{
v1beta1constants.DeploymentNameKubeControllerManager,
v1beta1constants.DeploymentNameGardenerResourceManager,
} {
if err := kubernetes.ScaleDeployment(ctx, client, kutil.Key(b.Shoot.SeedNamespace, deployment), 1); err != nil {
return err
}
}
return nil
}
// HibernateControlPlane hibernates the entire control plane if the shoot shall be hibernated.
func (b *Botanist) HibernateControlPlane(ctx context.Context) error {
c := b.K8sSeedClient.Client()
if b.K8sShootClient != nil {
ctxWithTimeOut, cancel := context.WithTimeout(ctx, 10*time.Minute)
defer cancel()
// If a shoot is hibernated we only want to scale down the entire control plane if no nodes exist anymore. The node-lifecycle-controller
// inside KCM is responsible for deleting Node objects of terminated/non-existing VMs, so let's wait for that before scaling down.
if err := b.WaitUntilNodesDeleted(ctxWithTimeOut); err != nil {
return err
}
// Also wait for all Pods to reflect the correct state before scaling down the control plane.
// KCM should remove all Pods in the cluster that are bound to Nodes that no longer exist and
// therefore there should be no Pods with state `Running` anymore.
if err := b.WaitUntilNoPodRunning(ctxWithTimeOut); err != nil {
return err
}
// Also wait for all Endpoints to not contain any IPs from the Shoot's PodCIDR.
// This is to make sure that the Endpoints objects also reflect the correct state of the hibernated cluster.
// Otherwise this could cause timeouts in user-defined webhooks for CREATE Pods or Nodes on wakeup.
if err := b.WaitUntilEndpointsDoNotContainPodIPs(ctxWithTimeOut); err != nil {
return err
}
}
deployments := []string{
v1beta1constants.DeploymentNameGardenerResourceManager,
v1beta1constants.DeploymentNameKubeControllerManager,
v1beta1constants.DeploymentNameKubeAPIServer,
}
for _, deployment := range deployments {
if err := kubernetes.ScaleDeployment(ctx, c, kutil.Key(b.Shoot.SeedNamespace, deployment), 0); client.IgnoreNotFound(err) != nil {
return err
}
}
if err := c.Delete(ctx, &hvpav1alpha1.Hvpa{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer, Namespace: b.Shoot.SeedNamespace}}, kubernetes.DefaultDeleteOptions...); err != nil {
if !apierrors.IsNotFound(err) && !meta.IsNoMatchError(err) {
return err
}
}
if !b.Shoot.DisableDNS {
if err := c.Delete(ctx, &corev1.Service{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer, Namespace: b.Shoot.SeedNamespace}}, kubernetes.DefaultDeleteOptions...); client.IgnoreNotFound(err) != nil {
return err
}
if err := flow.Parallel(
func(ctx context.Context) error { return b.DestroyInternalDomainDNSRecord(ctx) },
func(ctx context.Context) error { return b.DestroyExternalDomainDNSRecord(ctx) },
func(ctx context.Context) error { return b.DestroyIngressDNSRecord(ctx) },
)(ctx); err != nil {
return err
}
}
for _, etcd := range []string{v1beta1constants.ETCDEvents, v1beta1constants.ETCDMain} {
if err := kubernetes.ScaleEtcd(ctx, c, kutil.Key(b.Shoot.SeedNamespace, etcd), 0); client.IgnoreNotFound(err) != nil {
return err
}
}
return nil
}
// ControlPlaneDefaultTimeout is the default timeout and defines how long Gardener should wait
// for a successful reconciliation of a control plane resource.
const ControlPlaneDefaultTimeout = 3 * time.Minute
// DeployControlPlane creates the `ControlPlane` extension resource in the shoot namespace in the seed
// cluster. Gardener waits until an external controller did reconcile the cluster successfully.
func (b *Botanist) DeployControlPlane(ctx context.Context) error {
var (
cp = &extensionsv1alpha1.ControlPlane{
ObjectMeta: metav1.ObjectMeta{
Name: b.Shoot.Info.Name,
Namespace: b.Shoot.SeedNamespace,
},
}
providerConfig *runtime.RawExtension
)
if cfg := b.Shoot.Info.Spec.Provider.ControlPlaneConfig; cfg != nil {
providerConfig = &runtime.RawExtension{
Raw: cfg.Raw,
}
}
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), cp, func() error {
metav1.SetMetaDataAnnotation(&cp.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile)
cp.Spec = extensionsv1alpha1.ControlPlaneSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: string(b.Shoot.Info.Spec.Provider.Type),
ProviderConfig: providerConfig,
},
Region: b.Shoot.Info.Spec.Region,
SecretRef: corev1.SecretReference{
Name: v1beta1constants.SecretNameCloudProvider,
Namespace: cp.Namespace,
},
InfrastructureProviderStatus: &runtime.RawExtension{
Raw: b.Shoot.InfrastructureStatus,
},
}
return nil
})
return err
}
const controlPlaneExposureSuffix = "-exposure"
// DeployControlPlaneExposure creates the `ControlPlane` extension resource with purpose `exposure` in the shoot
// namespace in the seed cluster. Gardener waits until an external controller did reconcile the cluster successfully.
func (b *Botanist) DeployControlPlaneExposure(ctx context.Context) error {
var (
cp = &extensionsv1alpha1.ControlPlane{
ObjectMeta: metav1.ObjectMeta{
Name: b.Shoot.Info.Name + controlPlaneExposureSuffix,
Namespace: b.Shoot.SeedNamespace,
},
}
)
purpose := new(extensionsv1alpha1.Purpose)
*purpose = extensionsv1alpha1.Exposure
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), cp, func() error {
metav1.SetMetaDataAnnotation(&cp.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile)
cp.Spec = extensionsv1alpha1.ControlPlaneSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: b.Seed.Info.Spec.Provider.Type,
},
Region: b.Seed.Info.Spec.Provider.Region,
Purpose: purpose,
SecretRef: corev1.SecretReference{
Name: v1beta1constants.SecretNameCloudProvider,
Namespace: cp.Namespace,
},
}
return nil
})
return err
}
// DestroyControlPlane deletes the `ControlPlane` extension resource in the shoot namespace in the seed cluster,
// and it waits for a maximum of 10m until it is deleted.
func (b *Botanist) DestroyControlPlane(ctx context.Context) error {
return b.destroyControlPlane(ctx, b.Shoot.Info.Name)
}
// DestroyControlPlaneExposure deletes the `ControlPlane` extension resource with purpose `exposure`
// in the shoot namespace in the seed cluster, and it waits for a maximum of 10m until it is deleted.
func (b *Botanist) DestroyControlPlaneExposure(ctx context.Context) error {
return b.destroyControlPlane(ctx, b.Shoot.Info.Name+controlPlaneExposureSuffix)
}
// destroyControlPlane deletes the `ControlPlane` extension resource with the following name in the shoot namespace
// in the seed cluster, and it waits for a maximum of 10m until it is deleted.
func (b *Botanist) destroyControlPlane(ctx context.Context, name string) error {
return client.IgnoreNotFound(b.K8sSeedClient.Client().Delete(ctx, &extensionsv1alpha1.ControlPlane{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: name}}))
}
// WaitUntilControlPlaneExposureReady waits until the control plane resource with purpose `exposure` has been reconciled successfully.
func (b *Botanist) WaitUntilControlPlaneExposureReady(ctx context.Context) error {
return b.waitUntilControlPlaneReady(ctx, b.Shoot.Info.Name+controlPlaneExposureSuffix)
}
// WaitUntilControlPlaneReady waits until the control plane resource has been reconciled successfully.
func (b *Botanist) WaitUntilControlPlaneReady(ctx context.Context) error {
return b.waitUntilControlPlaneReady(ctx, b.Shoot.Info.Name)
}
// waitUntilControlPlaneReady waits until the control plane resource has been reconciled successfully.
func (b *Botanist) waitUntilControlPlaneReady(ctx context.Context, name string) error {
if err := retry.UntilTimeout(ctx, DefaultInterval, ControlPlaneDefaultTimeout, func(ctx context.Context) (bool, error) {
cp := &extensionsv1alpha1.ControlPlane{}
if err := b.K8sSeedClient.Client().Get(ctx, client.ObjectKey{Name: name, Namespace: b.Shoot.SeedNamespace}, cp); err != nil {
return retry.SevereError(err)
}
if err := health.CheckExtensionObject(cp); err != nil {
b.Logger.WithError(err).Error("Control plane did not get ready yet")
return retry.MinorError(err)
}
if cp.Status.ProviderStatus != nil {
b.Shoot.ControlPlaneStatus = cp.Status.ProviderStatus.Raw
}
return retry.Ok()
}); err != nil {
return gardencorev1beta1helper.DetermineError(err, fmt.Sprintf("failed to create control plane: %v", err))
}
return nil
}
// WaitUntilControlPlaneExposureDeleted waits until the control plane resource with purpose `exposure` has been deleted.
func (b *Botanist) WaitUntilControlPlaneExposureDeleted(ctx context.Context) error {
return b.waitUntilControlPlaneDeleted(ctx, b.Shoot.Info.Name+controlPlaneExposureSuffix)
}
// WaitUntilControlPlaneDeleted waits until the control plane resource has been deleted.
func (b *Botanist) WaitUntilControlPlaneDeleted(ctx context.Context) error {
return b.waitUntilControlPlaneDeleted(ctx, b.Shoot.Info.Name)
}
// waitUntilControlPlaneDeleted waits until the control plane resource with the following name has been deleted.
func (b *Botanist) waitUntilControlPlaneDeleted(ctx context.Context, name string) error {
var lastError *gardencorev1beta1.LastError
if err := retry.UntilTimeout(ctx, DefaultInterval, ControlPlaneDefaultTimeout, func(ctx context.Context) (bool, error) {
cp := &extensionsv1alpha1.ControlPlane{}
if err := b.K8sSeedClient.Client().Get(ctx, client.ObjectKey{Name: name, Namespace: b.Shoot.SeedNamespace}, cp); err != nil {
if apierrors.IsNotFound(err) {
return retry.Ok()
}
return retry.SevereError(err)
}
if lastErr := cp.Status.LastError; lastErr != nil {
b.Logger.Errorf("Control plane did not get deleted yet, lastError is: %s", lastErr.Description)
lastError = lastErr
}
b.Logger.Infof("Waiting for control plane to be deleted...")
return retry.MinorError(gardencorev1beta1helper.WrapWithLastError(fmt.Errorf("control plane is not yet deleted"), lastError))
}); err != nil {
message := fmt.Sprintf("Failed to delete control plane")
if lastError != nil {
return gardencorev1beta1helper.DetermineError(errors.New(lastError.Description), fmt.Sprintf("%s: %s", message, lastError.Description))
}
return gardencorev1beta1helper.DetermineError(err, fmt.Sprintf("%s: %s", message, err.Error()))
}
return nil
}
// DeployGardenerResourceManager deploys the gardener-resource-manager which will use CRD resources in order
// to ensure that they exist in a cluster/reconcile them in case somebody changed something.
func (b *Botanist) DeployGardenerResourceManager(ctx context.Context) error {
var name = "gardener-resource-manager"
defaultValues := map[string]interface{}{
"podAnnotations": map[string]interface{}{
"checksum/secret-" + name: b.CheckSums[name],
},
"replicas": b.Shoot.GetReplicas(1),
}
values, err := b.InjectSeedShootImages(defaultValues, common.GardenerResourceManagerImageName)
if err != nil {
return err
}
return b.ChartApplierSeed.Apply(ctx, filepath.Join(common.ChartPath, "seed-controlplane", "charts", name), b.Shoot.SeedNamespace, name, kubernetes.Values(values))
}
// DeployBackupEntryInGarden deploys the BackupEntry resource in garden.
func (b *Botanist) DeployBackupEntryInGarden(ctx context.Context) error {
var (
name = common.GenerateBackupEntryName(b.Shoot.Info.Status.TechnicalID, b.Shoot.Info.Status.UID)
backupEntry = &gardencorev1beta1.BackupEntry{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: b.Shoot.Info.Namespace,
},
}
bucketName string
seedName *string
)
if err := b.K8sGardenClient.Client().Get(ctx, kutil.Key(b.Shoot.Info.Namespace, name), backupEntry); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
// If backupEntry doesn't already exists, we have to assign backupBucket to backupEntry.
bucketName = string(b.Seed.Info.UID)
seedName = &b.Seed.Info.Name
} else {
bucketName = backupEntry.Spec.BucketName
seedName = backupEntry.Spec.SeedName
}
ownerRef := metav1.NewControllerRef(b.Shoot.Info, gardencorev1beta1.SchemeGroupVersion.WithKind("Shoot"))
blockOwnerDeletion := false
ownerRef.BlockOwnerDeletion = &blockOwnerDeletion
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sGardenClient.Client(), backupEntry, func() error {
metav1.SetMetaDataAnnotation(&backupEntry.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile)
finalizers := sets.NewString(backupEntry.GetFinalizers()...)
finalizers.Insert(gardencorev1beta1.GardenerName)
backupEntry.SetFinalizers(finalizers.UnsortedList())
backupEntry.ObjectMeta.OwnerReferences = []metav1.OwnerReference{*ownerRef}
backupEntry.Spec.BucketName = bucketName
backupEntry.Spec.SeedName = seedName
return nil
})
return err
}
const (
auditPolicyConfigMapDataKey = "policy"
)
var (
runtimeScheme = runtime.NewScheme()
codecs = serializer.NewCodecFactory(runtimeScheme)
decoder = codecs.UniversalDecoder()
)
func init() {
_ = auditv1alpha1.AddToScheme(runtimeScheme)
_ = auditv1beta1.AddToScheme(runtimeScheme)
_ = auditv1.AddToScheme(runtimeScheme)
_ = audit_internal.AddToScheme(runtimeScheme)
}
// getResourcesForAPIServer returns the cpu and memory requirements for API server based on nodeCount
func getResourcesForAPIServer(nodeCount int32, scalingClass string) (string, string, string, string) {
var (
validScalingClasses = sets.NewString("small", "medium", "large", "xlarge", "2xlarge")
cpuRequest string
memoryRequest string
cpuLimit string
memoryLimit string
)
if !validScalingClasses.Has(scalingClass) {
switch {
case nodeCount <= 2:
scalingClass = "small"
case nodeCount <= 10:
scalingClass = "medium"
case nodeCount <= 50:
scalingClass = "large"
case nodeCount <= 100:
scalingClass = "xlarge"
default:
scalingClass = "2xlarge"
}
}
switch {
case scalingClass == "small":
cpuRequest = "800m"
memoryRequest = "800Mi"
cpuLimit = "1000m"
memoryLimit = "1200Mi"
case scalingClass == "medium":
cpuRequest = "1000m"
memoryRequest = "1100Mi"
cpuLimit = "1200m"
memoryLimit = "1900Mi"
case scalingClass == "large":
cpuRequest = "1200m"
memoryRequest = "1600Mi"
cpuLimit = "1500m"
memoryLimit = "3900Mi"
case scalingClass == "xlarge":
cpuRequest = "2500m"
memoryRequest = "5200Mi"
cpuLimit = "3000m"
memoryLimit = "5900Mi"
case scalingClass == "2xlarge":
cpuRequest = "3000m"
memoryRequest = "5200Mi"
cpuLimit = "4000m"
memoryLimit = "7800Mi"
}
return cpuRequest, memoryRequest, cpuLimit, memoryLimit
}
func (b *Botanist) deployNetworkPolicies(ctx context.Context, denyAll bool) error {
var (
globalNetworkPoliciesValues = map[string]interface{}{
"blockedAddresses": b.Seed.Info.Spec.Networks.BlockCIDRs,
"denyAll": denyAll,
}
excludeNets = []string{}
values = map[string]interface{}{}
)
excludeNets = append(excludeNets, b.Seed.Info.Spec.Networks.BlockCIDRs...)
var shootCIDRNetworks []string
if v := b.Shoot.GetNodeNetwork(); v != nil {
shootCIDRNetworks = append(shootCIDRNetworks, *v)
}
if v := b.Shoot.Info.Spec.Networking.Pods; v != nil {
shootCIDRNetworks = append(shootCIDRNetworks, *v)
}
if v := b.Shoot.Info.Spec.Networking.Services; v != nil {
shootCIDRNetworks = append(shootCIDRNetworks, *v)
}
shootNetworkValues, err := common.ExceptNetworks(shootCIDRNetworks, excludeNets...)
if err != nil {
return err
}
values["clusterNetworks"] = shootNetworkValues
allCIDRNetworks := []string{b.Seed.Info.Spec.Networks.Pods, b.Seed.Info.Spec.Networks.Services}
if v := b.Seed.Info.Spec.Networks.Nodes; v != nil {
allCIDRNetworks = append(allCIDRNetworks, *v)
}
allCIDRNetworks = append(allCIDRNetworks, shootCIDRNetworks...)
allCIDRNetworks = append(allCIDRNetworks, excludeNets...)
privateNetworks, err := common.ToExceptNetworks(common.AllPrivateNetworkBlocks(), allCIDRNetworks...)
if err != nil {
return err
}
globalNetworkPoliciesValues["privateNetworks"] = privateNetworks
values["global-network-policies"] = globalNetworkPoliciesValues
return b.ChartApplierSeed.Apply(ctx, filepath.Join(chartPathControlPlane, "network-policies"), b.Shoot.SeedNamespace, "network-policies", kubernetes.Values(values))
}
// DeployNetworkPolicies creates a network policies in a Shoot cluster's namespace that
// deny all traffic and allow certain components to use annotations to declare their desire
// to transmit/receive traffic to/from other Pods/IP addresses.
func (b *Botanist) DeployNetworkPolicies(ctx context.Context) error {
return b.deployNetworkPolicies(ctx, true)
}
// DeployKubeAPIServerService deploys kube-apiserver service.
func (b *Botanist) DeployKubeAPIServerService(ctx context.Context) error {
const name = "kube-apiserver-service"
return b.ChartApplierSeed.Apply(ctx, filepath.Join(chartPathControlPlane, name), b.Shoot.SeedNamespace, name)
}
// DeployKubeAPIServer deploys kube-apiserver deployment.
func (b *Botanist) DeployKubeAPIServer(ctx context.Context) error {
hvpaEnabled := gardenletfeatures.FeatureGate.Enabled(features.HVPA)
memoryMetricForHpaEnabled := false
if b.ShootedSeed != nil {
// Override for shooted seeds
hvpaEnabled = gardenletfeatures.FeatureGate.Enabled(features.HVPAForShootedSeed)
memoryMetricForHpaEnabled = true
}
var (
minReplicas int32 = 1
maxReplicas int32 = 4
shootNetworks = map[string]interface{}{
"services": b.Shoot.Networks.Services.String(),
"pods": b.Shoot.Networks.Pods.String(),
}
defaultValues = map[string]interface{}{
"etcdServicePort": 2379,
"kubernetesVersion": b.Shoot.Info.Spec.Kubernetes.Version,
"enableBasicAuthentication": gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info),
"probeCredentials": b.APIServerHealthCheckToken,
"securePort": 443,
"podAnnotations": map[string]interface{}{
"checksum/secret-ca": b.CheckSums[v1beta1constants.SecretNameCACluster],
"checksum/secret-ca-front-proxy": b.CheckSums[v1beta1constants.SecretNameCAFrontProxy],
"checksum/secret-kube-apiserver": b.CheckSums[v1beta1constants.DeploymentNameKubeAPIServer],
"checksum/secret-kube-aggregator": b.CheckSums["kube-aggregator"],
"checksum/secret-kube-apiserver-kubelet": b.CheckSums["kube-apiserver-kubelet"],
"checksum/secret-static-token": b.CheckSums[common.StaticTokenSecretName],
"checksum/secret-vpn-seed": b.CheckSums["vpn-seed"],
"checksum/secret-vpn-seed-tlsauth": b.CheckSums["vpn-seed-tlsauth"],
"checksum/secret-service-account-key": b.CheckSums["service-account-key"],
"checksum/secret-etcd-ca": b.CheckSums[v1beta1constants.SecretNameCAETCD],
"checksum/secret-etcd-client-tls": b.CheckSums["etcd-client-tls"],
},
"hvpa": map[string]interface{}{
"enabled": hvpaEnabled,
},
"hpa": map[string]interface{}{
"memoryMetricForHpaEnabled": memoryMetricForHpaEnabled,
},
}
)
if v := b.Shoot.GetNodeNetwork(); v != nil {
shootNetworks["nodes"] = *v
}
defaultValues["shootNetworks"] = shootNetworks
enableEtcdEncryption, err := version.CheckVersionMeetsConstraint(b.Shoot.Info.Spec.Kubernetes.Version, ">= 1.13")
if err != nil {
return err
}
if enableEtcdEncryption {
defaultValues["enableEtcdEncryption"] = true
defaultValues["podAnnotations"].(map[string]interface{})["checksum/secret-etcd-encryption"] = b.CheckSums[common.EtcdEncryptionSecretName]
}
if gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info) {
defaultValues["podAnnotations"].(map[string]interface{})["checksum/secret-"+common.BasicAuthSecretName] = b.CheckSums[common.BasicAuthSecretName]
}
foundDeployment := true
deployment := &appsv1.Deployment{}
if err := b.K8sSeedClient.Client().Get(context.TODO(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), deployment); err != nil && !apierrors.IsNotFound(err) {
return err
} else if apierrors.IsNotFound(err) {
foundDeployment = false
}
if b.ShootedSeed != nil && !hvpaEnabled {
var (
apiServer = b.ShootedSeed.APIServer
autoscaler = apiServer.Autoscaler
)
defaultValues["replicas"] = *apiServer.Replicas
minReplicas = *autoscaler.MinReplicas
maxReplicas = autoscaler.MaxReplicas
defaultValues["apiServerResources"] = map[string]interface{}{
"requests": map[string]interface{}{
"cpu": "1750m",
"memory": "2Gi",
},
"limits": map[string]interface{}{
"cpu": "4000m",
"memory": "8Gi",
},
}
} else {
replicas := deployment.Spec.Replicas
// As kube-apiserver HPA manages the number of replicas, we have to maintain current number of replicas
// otherwise keep the value to default
if replicas != nil && *replicas > 0 {
defaultValues["replicas"] = *replicas
}
// If the shoot is hibernated then we want to keep the number of replicas (scale down happens later).
if b.Shoot.HibernationEnabled && (replicas == nil || *replicas == 0) {
defaultValues["replicas"] = 0
}
var cpuRequest, memoryRequest, cpuLimit, memoryLimit string
if hvpaEnabled {
cpuRequest, memoryRequest, cpuLimit, memoryLimit = getResourcesForAPIServer(b.Shoot.GetMinNodeCount(), b.Shoot.Info.Annotations[common.ShootAlphaScalingAPIServerClass])
} else {
cpuRequest, memoryRequest, cpuLimit, memoryLimit = getResourcesForAPIServer(b.Shoot.GetMaxNodeCount(), b.Shoot.Info.Annotations[common.ShootAlphaScalingAPIServerClass])
}
defaultValues["apiServerResources"] = map[string]interface{}{
"limits": map[string]interface{}{
"cpu": cpuLimit,
"memory": memoryLimit,
},
"requests": map[string]interface{}{
"cpu": cpuRequest,
"memory": memoryRequest,
},
}
}
if foundDeployment && hvpaEnabled {
// Deployment is already created AND is controlled by HVPA
// Keep the "resources" as it is.
for k := range deployment.Spec.Template.Spec.Containers {
v := &deployment.Spec.Template.Spec.Containers[k]
if v.Name == "kube-apiserver" {
defaultValues["apiServerResources"] = v.Resources.DeepCopy()
break
}
}
}
defaultValues["minReplicas"] = minReplicas
defaultValues["maxReplicas"] = maxReplicas
var (
apiServerConfig = b.Shoot.Info.Spec.Kubernetes.KubeAPIServer
admissionPlugins = kubernetes.GetAdmissionPluginsForVersion(b.Shoot.Info.Spec.Kubernetes.Version)
serviceAccountTokenIssuerURL = fmt.Sprintf("https://%s", b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true))
serviceAccountConfigVals = map[string]interface{}{}
)
if apiServerConfig != nil {
defaultValues["featureGates"] = apiServerConfig.FeatureGates
defaultValues["runtimeConfig"] = apiServerConfig.RuntimeConfig
if apiServerConfig.OIDCConfig != nil {
defaultValues["oidcConfig"] = apiServerConfig.OIDCConfig
}
if serviceAccountConfig := apiServerConfig.ServiceAccountConfig; serviceAccountConfig != nil {
if issuer := serviceAccountConfig.Issuer; issuer != nil {
serviceAccountTokenIssuerURL = *issuer
}
if signingKeySecret := serviceAccountConfig.SigningKeySecret; signingKeySecret != nil {
signingKey, err := common.GetServiceAccountSigningKeySecret(context.TODO(), b.K8sGardenClient.Client(), b.Shoot.Info.Namespace, signingKeySecret.Name)
if err != nil {
return err
}
serviceAccountConfigVals["signingKey"] = signingKey
}
}
if apiServerConfig.APIAudiences != nil {
defaultValues["apiAudiences"] = apiServerConfig.APIAudiences
}
for _, plugin := range apiServerConfig.AdmissionPlugins {
pluginOverwritesDefault := false
for i, defaultPlugin := range admissionPlugins {
if defaultPlugin.Name == plugin.Name {
pluginOverwritesDefault = true
admissionPlugins[i] = plugin
break
}
}
if !pluginOverwritesDefault {
admissionPlugins = append(admissionPlugins, plugin)
}
}
if apiServerConfig.AuditConfig != nil &&
apiServerConfig.AuditConfig.AuditPolicy != nil &&
apiServerConfig.AuditConfig.AuditPolicy.ConfigMapRef != nil {
auditPolicy, err := b.getAuditPolicy(apiServerConfig.AuditConfig.AuditPolicy.ConfigMapRef.Name, b.Shoot.Info.Namespace)
if err != nil {
return fmt.Errorf("retrieving audit policy from the ConfigMap '%v' failed with reason '%v'", apiServerConfig.AuditConfig.AuditPolicy.ConfigMapRef.Name, err)
}
defaultValues["auditConfig"] = map[string]interface{}{
"auditPolicy": auditPolicy,
}
}
}
serviceAccountConfigVals["issuer"] = serviceAccountTokenIssuerURL
defaultValues["serviceAccountConfig"] = serviceAccountConfigVals
defaultValues["admissionPlugins"] = admissionPlugins
values, err := b.InjectSeedShootImages(defaultValues,
common.KubeAPIServerImageName,
common.VPNSeedImageName,
common.BlackboxExporterImageName,
common.AlpineIptablesImageName,
)
if err != nil {
return err
}
// If HVPA feature gate is enabled then we should delete the old HPA and VPA resources as
// the HVPA controller will create its own for the kube-apiserver deployment.
if hvpaEnabled {
for _, obj := range []struct {
apiGroup string
version string
kind string
name string
}{
{"autoscaling", "v2beta1", "HorizontalPodAutoscaler", v1beta1constants.DeploymentNameKubeAPIServer},
{"autoscaling.k8s.io", "v1beta2", "VerticalPodAutoscaler", v1beta1constants.DeploymentNameKubeAPIServer + "-vpa"},
} {
u := &unstructured.Unstructured{}
u.SetName(obj.name)
u.SetNamespace(b.Shoot.SeedNamespace)
u.SetGroupVersionKind(schema.GroupVersionKind{
Group: obj.apiGroup,
Version: obj.version,
Kind: obj.kind,
})
if err := b.K8sSeedClient.Client().Delete(context.TODO(), u); client.IgnoreNotFound(err) != nil {
return err
}
}
} else {
// If HVPA is disabled, delete any HVPA that was already deployed
u := &unstructured.Unstructured{}
u.SetName(v1beta1constants.DeploymentNameKubeAPIServer)
u.SetNamespace(b.Shoot.SeedNamespace)
u.SetGroupVersionKind(schema.GroupVersionKind{
Group: "autoscaling.k8s.io",
Version: "v1alpha1",
Kind: "Hvpa",
})
if err := b.K8sSeedClient.Client().Delete(context.TODO(), u); err != nil {
if !apierrors.IsNotFound(err) && !meta.IsNoMatchError(err) {
return err
}
}
}
return b.ChartApplierSeed.Apply(ctx, filepath.Join(chartPathControlPlane, v1beta1constants.DeploymentNameKubeAPIServer), b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer, kubernetes.Values(values))
}
func (b *Botanist) getAuditPolicy(name, namespace string) (string, error) {
auditPolicyCm := &corev1.ConfigMap{}
if err := b.K8sGardenClient.Client().Get(context.TODO(), kutil.Key(namespace, name), auditPolicyCm); err != nil {
return "", err
}
auditPolicy, ok := auditPolicyCm.Data[auditPolicyConfigMapDataKey]
if !ok {
return "", fmt.Errorf("missing '.data.policy' in audit policy configmap %v/%v", namespace, name)
}
if len(auditPolicy) == 0 {
return "", fmt.Errorf("empty audit policy. Provide non-empty audit policy")
}
auditPolicyObj, schemaVersion, err := decoder.Decode([]byte(auditPolicy), nil, nil)
if err != nil {
return "", fmt.Errorf("failed to decode the provided audit policy err=%v", err)
}
if isValidVersion, err := IsValidAuditPolicyVersion(b.ShootVersion(), schemaVersion); err != nil {
return "", err
} else if !isValidVersion {
return "", fmt.Errorf("your shoot cluster version %q is not compatible with audit policy version %q", b.ShootVersion(), schemaVersion.GroupVersion().String())
}
auditPolicyInternal, ok := auditPolicyObj.(*audit_internal.Policy)
if !ok {
return "", fmt.Errorf("failure to cast to audit Policy type: %v", schemaVersion)
}
errList := auditvalidation.ValidatePolicy(auditPolicyInternal)
if len(errList) != 0 {
return "", fmt.Errorf("provided invalid audit policy err=%v", errList)
}
return auditPolicy, nil
}
// IsValidAuditPolicyVersion checks whether the api server support the provided audit policy apiVersion
func IsValidAuditPolicyVersion(shootVersion string, schemaVersion *schema.GroupVersionKind) (bool, error) {
auditGroupVersion := schemaVersion.GroupVersion().String()
if auditGroupVersion == "audit.k8s.io/v1" {
return version.CheckVersionMeetsConstraint(shootVersion, ">= v1.12")
}
return true, nil
}
// DeployKubeControllerManager deploys kube-controller-manager deployment.
func (b *Botanist) DeployKubeControllerManager(ctx context.Context) error {
defaultValues := map[string]interface{}{
"clusterName": b.Shoot.SeedNamespace,
"kubernetesVersion": b.Shoot.Info.Spec.Kubernetes.Version,
"podNetwork": b.Shoot.Networks.Pods.String(),
"serviceNetwork": b.Shoot.Networks.Services.String(),
"podAnnotations": map[string]interface{}{
"checksum/secret-ca": b.CheckSums[v1beta1constants.SecretNameCACluster],
"checksum/secret-kube-controller-manager": b.CheckSums[v1beta1constants.DeploymentNameKubeControllerManager],
"checksum/secret-kube-controller-manager-server": b.CheckSums[common.KubeControllerManagerServerName],