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kubeapiserver.go
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kubeapiserver.go
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// Copyright (c) 2021 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"
"fmt"
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"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/features"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/operation/botanist/component/etcd"
"github.com/gardener/gardener/pkg/operation/botanist/component/kubeapiserver"
"github.com/gardener/gardener/pkg/operation/botanist/component/vpnseedserver"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/images"
"github.com/gardener/gardener/pkg/utils/imagevector"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/utils/pointer"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// DefaultKubeAPIServer returns a deployer for the kube-apiserver.
func (b *Botanist) DefaultKubeAPIServer(ctx context.Context) (kubeapiserver.Interface, error) {
images, err := b.computeKubeAPIServerImages()
if err != nil {
return nil, err
}
var (
apiServerConfig = b.Shoot.GetInfo().Spec.Kubernetes.KubeAPIServer
admissionPlugins = kutil.GetAdmissionPluginsForVersion(b.Shoot.GetInfo().Spec.Kubernetes.Version)
apiAudiences = []string{"kubernetes", "gardener"}
auditConfig *kubeapiserver.AuditConfig
eventTTL *metav1.Duration
featureGates map[string]bool
oidcConfig *gardencorev1beta1.OIDCConfig
requests *gardencorev1beta1.KubeAPIServerRequests
runtimeConfig map[string]bool
watchCacheSizes *gardencorev1beta1.WatchCacheSizes
)
if apiServerConfig != nil {
admissionPlugins = b.computeKubeAPIServerAdmissionPlugins(admissionPlugins, apiServerConfig.AdmissionPlugins)
if apiServerConfig.APIAudiences != nil {
apiAudiences = apiServerConfig.APIAudiences
if !utils.ValueExists(v1beta1constants.GardenerAudience, apiAudiences) {
apiAudiences = append(apiAudiences, v1beta1constants.GardenerAudience)
}
}
auditConfig, err = b.computeKubeAPIServerAuditConfig(ctx, apiServerConfig.AuditConfig)
if err != nil {
return nil, err
}
eventTTL = apiServerConfig.EventTTL
featureGates = apiServerConfig.FeatureGates
oidcConfig = apiServerConfig.OIDCConfig
requests = apiServerConfig.Requests
runtimeConfig = apiServerConfig.RuntimeConfig
watchCacheSizes = apiServerConfig.WatchCacheSizes
}
return kubeapiserver.New(
b.K8sSeedClient,
b.Shoot.SeedNamespace,
kubeapiserver.Values{
AdmissionPlugins: admissionPlugins,
AnonymousAuthenticationEnabled: gardencorev1beta1helper.ShootWantsAnonymousAuthentication(b.Shoot.GetInfo().Spec.Kubernetes.KubeAPIServer),
APIAudiences: apiAudiences,
Audit: auditConfig,
Autoscaling: b.computeKubeAPIServerAutoscalingConfig(),
BasicAuthenticationEnabled: gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.GetInfo()),
EventTTL: eventTTL,
FeatureGates: featureGates,
Images: images,
OIDC: oidcConfig,
Requests: requests,
RuntimeConfig: runtimeConfig,
Version: b.Shoot.KubernetesVersion,
VPN: kubeapiserver.VPNConfig{
ReversedVPNEnabled: b.Shoot.ReversedVPNEnabled,
PodNetworkCIDR: b.Shoot.Networks.Pods.String(),
ServiceNetworkCIDR: b.Shoot.Networks.Services.String(),
NodeNetworkCIDR: b.Shoot.GetInfo().Spec.Networking.Nodes,
},
WatchCacheSizes: watchCacheSizes,
},
), nil
}
func (b *Botanist) computeKubeAPIServerAdmissionPlugins(defaultPlugins, configuredPlugins []gardencorev1beta1.AdmissionPlugin) []gardencorev1beta1.AdmissionPlugin {
for _, plugin := range configuredPlugins {
pluginOverwritesDefault := false
for i, defaultPlugin := range defaultPlugins {
if defaultPlugin.Name == plugin.Name {
pluginOverwritesDefault = true
defaultPlugins[i] = plugin
break
}
}
if !pluginOverwritesDefault {
defaultPlugins = append(defaultPlugins, plugin)
}
}
return defaultPlugins
}
func (b *Botanist) computeKubeAPIServerAuditConfig(ctx context.Context, config *gardencorev1beta1.AuditConfig) (*kubeapiserver.AuditConfig, error) {
if config == nil || config.AuditPolicy == nil || config.AuditPolicy.ConfigMapRef == nil {
return nil, nil
}
out := &kubeapiserver.AuditConfig{}
configMap := &corev1.ConfigMap{}
if err := b.K8sGardenClient.Client().Get(ctx, kutil.Key(b.Shoot.GetInfo().Namespace, config.AuditPolicy.ConfigMapRef.Name), configMap); err != nil {
// Ignore missing audit configuration on shoot deletion to prevent failing redeployments of the
// kube-apiserver in case the end-user deleted the configmap before/simultaneously to the shoot
// deletion.
if !apierrors.IsNotFound(err) || b.Shoot.GetInfo().DeletionTimestamp == nil {
return nil, fmt.Errorf("retrieving audit policy from the ConfigMap '%v' failed with reason '%w'", config.AuditPolicy.ConfigMapRef.Name, err)
}
} else {
policy, ok := configMap.Data["policy"]
if !ok {
return nil, fmt.Errorf("missing '.data.policy' in audit policy configmap %v/%v", b.Shoot.GetInfo().Namespace, config.AuditPolicy.ConfigMapRef.Name)
}
out.Policy = &policy
}
return out, nil
}
func (b *Botanist) computeKubeAPIServerAutoscalingConfig() kubeapiserver.AutoscalingConfig {
var (
hvpaEnabled = gardenletfeatures.FeatureGate.Enabled(features.HVPA)
useMemoryMetricForHvpaHPA = false
scaleDownDisabledForHvpa = false
defaultReplicas *int32
minReplicas int32 = 1
maxReplicas int32 = 4
apiServerResources corev1.ResourceRequirements
)
if b.Shoot.Purpose == gardencorev1beta1.ShootPurposeProduction {
minReplicas = 2
}
if metav1.HasAnnotation(b.Shoot.GetInfo().ObjectMeta, v1beta1constants.ShootAlphaControlPlaneScaleDownDisabled) {
minReplicas = 4
scaleDownDisabledForHvpa = true
}
nodeCount := b.Shoot.GetMinNodeCount()
if hvpaEnabled {
nodeCount = b.Shoot.GetMaxNodeCount()
}
apiServerResources = resourcesRequirementsForKubeAPIServer(nodeCount, b.Shoot.GetInfo().Annotations[v1beta1constants.ShootAlphaScalingAPIServerClass])
if b.ManagedSeed != nil {
hvpaEnabled = gardenletfeatures.FeatureGate.Enabled(features.HVPAForShootedSeed)
useMemoryMetricForHvpaHPA = true
if b.ManagedSeedAPIServer != nil {
minReplicas = *b.ManagedSeedAPIServer.Autoscaler.MinReplicas
maxReplicas = b.ManagedSeedAPIServer.Autoscaler.MaxReplicas
if !hvpaEnabled {
defaultReplicas = b.ManagedSeedAPIServer.Replicas
apiServerResources = corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("1750m"),
corev1.ResourceMemory: resource.MustParse("2Gi"),
},
Limits: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("4000m"),
corev1.ResourceMemory: resource.MustParse("8Gi"),
},
}
}
}
}
return kubeapiserver.AutoscalingConfig{
APIServerResources: apiServerResources,
HVPAEnabled: hvpaEnabled,
Replicas: defaultReplicas,
MinReplicas: minReplicas,
MaxReplicas: maxReplicas,
UseMemoryMetricForHvpaHPA: useMemoryMetricForHvpaHPA,
ScaleDownDisabledForHvpa: scaleDownDisabledForHvpa,
}
}
func resourcesRequirementsForKubeAPIServer(nodeCount int32, scalingClass string) corev1.ResourceRequirements {
var (
validScalingClasses = sets.NewString("small", "medium", "large", "xlarge", "2xlarge")
cpuRequest, cpuLimit string
memoryRequest, 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, cpuLimit = "800m", "1000m"
memoryRequest, memoryLimit = "800Mi", "1200Mi"
case scalingClass == "medium":
cpuRequest, cpuLimit = "1000m", "1200m"
memoryRequest, memoryLimit = "1100Mi", "1900Mi"
case scalingClass == "large":
cpuRequest, cpuLimit = "1200m", "1500m"
memoryRequest, memoryLimit = "1600Mi", "3900Mi"
case scalingClass == "xlarge":
cpuRequest, cpuLimit = "2500m", "3000m"
memoryRequest, memoryLimit = "5200Mi", "5900Mi"
case scalingClass == "2xlarge":
cpuRequest, cpuLimit = "3000m", "4000m"
memoryRequest, memoryLimit = "5200Mi", "7800Mi"
}
return corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse(cpuRequest),
corev1.ResourceMemory: resource.MustParse(memoryRequest),
},
Limits: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse(cpuLimit),
corev1.ResourceMemory: resource.MustParse(memoryLimit),
},
}
}
func (b *Botanist) computeKubeAPIServerImages() (kubeapiserver.Images, error) {
imageAlpineIPTables, err := b.ImageVector.FindImage(images.ImageNameAlpineIptables, imagevector.RuntimeVersion(b.SeedVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return kubeapiserver.Images{}, err
}
imageApiserverProxyPodWebhook, err := b.ImageVector.FindImage(images.ImageNameApiserverProxyPodWebhook, imagevector.RuntimeVersion(b.SeedVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return kubeapiserver.Images{}, err
}
imageKubeAPIServer, err := b.ImageVector.FindImage(images.ImageNameKubeApiserver, imagevector.RuntimeVersion(b.SeedVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return kubeapiserver.Images{}, err
}
imageVPNSeed, err := b.ImageVector.FindImage(images.ImageNameVpnSeed, imagevector.RuntimeVersion(b.SeedVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return kubeapiserver.Images{}, err
}
return kubeapiserver.Images{
AlpineIPTables: imageAlpineIPTables.String(),
APIServerProxyPodWebhook: imageApiserverProxyPodWebhook.String(),
KubeAPIServer: imageKubeAPIServer.String(),
VPNSeed: imageVPNSeed.String(),
}, nil
}
func (b *Botanist) computeKubeAPIServerServiceAccountConfig(ctx context.Context, config *gardencorev1beta1.KubeAPIServerConfig, externalHostname string) (kubeapiserver.ServiceAccountConfig, error) {
out := kubeapiserver.ServiceAccountConfig{Issuer: "https://" + externalHostname}
if config == nil || config.ServiceAccountConfig == nil {
return out, nil
}
out.ExtendTokenExpiration = config.ServiceAccountConfig.ExtendTokenExpiration
out.MaxTokenExpiration = config.ServiceAccountConfig.MaxTokenExpiration
if config.ServiceAccountConfig.Issuer != nil {
out.Issuer = *config.ServiceAccountConfig.Issuer
}
out.AcceptedIssuers = config.ServiceAccountConfig.AcceptedIssuers
if signingKeySecret := config.ServiceAccountConfig.SigningKeySecret; signingKeySecret != nil {
secret := &corev1.Secret{}
if err := b.K8sGardenClient.Client().Get(ctx, kutil.Key(b.Shoot.GetInfo().Namespace, signingKeySecret.Name), secret); err != nil {
return out, err
}
data, ok := secret.Data[kubeapiserver.SecretServiceAccountSigningKeyDataKeySigningKey]
if !ok {
return out, fmt.Errorf("no signing key in secret %s/%s at .data.%s", secret.Namespace, secret.Name, kubeapiserver.SecretServiceAccountSigningKeyDataKeySigningKey)
}
out.SigningKey = data
}
return out, nil
}
func (b *Botanist) computeKubeAPIServerSNIConfig() kubeapiserver.SNIConfig {
var config kubeapiserver.SNIConfig
if b.APIServerSNIEnabled() {
config.Enabled = true
config.AdvertiseAddress = b.APIServerClusterIP
if b.APIServerSNIPodMutatorEnabled() {
config.PodMutatorEnabled = true
config.APIServerFQDN = b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true)
}
}
return config
}
func (b *Botanist) computeKubeAPIServerReplicas(autoscalingConfig kubeapiserver.AutoscalingConfig, deployment *appsv1.Deployment) *int32 {
switch {
case autoscalingConfig.Replicas != nil:
// If the replicas were already set then don't change them.
return autoscalingConfig.Replicas
case deployment == nil && !b.Shoot.HibernationEnabled:
// If the Deployment does not yet exist then set the desired replicas to the minimum replicas.
return &autoscalingConfig.MinReplicas
case deployment != nil && deployment.Spec.Replicas != nil && *deployment.Spec.Replicas > 0:
// If the Deployment exists then don't interfere with the replicas because they are controlled via HVPA or HPA.
return deployment.Spec.Replicas
case b.Shoot.HibernationEnabled && (deployment == nil || deployment.Spec.Replicas == nil || *deployment.Spec.Replicas == 0):
// If the Shoot is hibernated and the deployment has already been scaled down then we want to keep it scaled
// down. If it has not yet been scaled down then above case applies (replicas are kept) - the scale-down will
// happen at a later point in the flow.
return pointer.Int32(0)
default:
// If none of the above cases applies then a default value has to be returned.
return pointer.Int32(1)
}
}
// DeployKubeAPIServer deploys the Kubernetes API server.
func (b *Botanist) DeployKubeAPIServer(ctx context.Context) error {
values := b.Shoot.Components.ControlPlane.KubeAPIServer.GetValues()
deployment := &appsv1.Deployment{}
if err := b.K8sSeedClient.Client().Get(ctx, kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), deployment); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
deployment = nil
}
b.Shoot.Components.ControlPlane.KubeAPIServer.SetAutoscalingReplicas(b.computeKubeAPIServerReplicas(values.Autoscaling, deployment))
if deployment != nil && values.Autoscaling.HVPAEnabled {
for _, container := range deployment.Spec.Template.Spec.Containers {
if container.Name == kubeapiserver.ContainerNameKubeAPIServer {
b.Shoot.Components.ControlPlane.KubeAPIServer.SetAutoscalingAPIServerResources(container.Resources)
break
}
}
}
secrets := kubeapiserver.Secrets{
CA: component.Secret{Name: v1beta1constants.SecretNameCACluster, Checksum: b.LoadCheckSum(v1beta1constants.SecretNameCACluster)},
CAEtcd: component.Secret{Name: etcd.SecretNameCA, Checksum: b.LoadCheckSum(etcd.SecretNameCA)},
CAFrontProxy: component.Secret{Name: v1beta1constants.SecretNameCAFrontProxy, Checksum: b.LoadCheckSum(v1beta1constants.SecretNameCAFrontProxy)},
Etcd: component.Secret{Name: etcd.SecretNameClient, Checksum: b.LoadCheckSum(etcd.SecretNameClient)},
EtcdEncryptionConfig: component.Secret{Name: kubeapiserver.SecretNameEtcdEncryption, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameEtcdEncryption)},
KubeAggregator: component.Secret{Name: kubeapiserver.SecretNameKubeAggregator, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameKubeAggregator)},
KubeAPIServerToKubelet: component.Secret{Name: kubeapiserver.SecretNameKubeAPIServerToKubelet, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameKubeAPIServerToKubelet)},
Server: component.Secret{Name: kubeapiserver.SecretNameServer, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameServer)},
ServiceAccountKey: component.Secret{Name: v1beta1constants.SecretNameServiceAccountKey, Checksum: b.LoadCheckSum(v1beta1constants.SecretNameServiceAccountKey)},
StaticToken: component.Secret{Name: kubeapiserver.SecretNameStaticToken, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameStaticToken)},
}
if values.BasicAuthenticationEnabled {
secrets.BasicAuthentication = &component.Secret{Name: kubeapiserver.SecretNameBasicAuth, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameBasicAuth)}
}
if values.VPN.ReversedVPNEnabled {
secrets.HTTPProxy = &component.Secret{Name: kubeapiserver.SecretNameHTTPProxy, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameHTTPProxy)}
secrets.VPNSeedServerTLSAuth = &component.Secret{Name: vpnseedserver.VpnSeedServerTLSAuth, Checksum: b.LoadCheckSum(vpnseedserver.VpnSeedServerTLSAuth)}
} else {
secrets.VPNSeed = &component.Secret{Name: kubeapiserver.SecretNameVPNSeed, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameVPNSeed)}
secrets.VPNSeedTLSAuth = &component.Secret{Name: kubeapiserver.SecretNameVPNSeedTLSAuth, Checksum: b.LoadCheckSum(kubeapiserver.SecretNameVPNSeedTLSAuth)}
}
b.Shoot.Components.ControlPlane.KubeAPIServer.SetSecrets(secrets)
b.Shoot.Components.ControlPlane.KubeAPIServer.SetSNIConfig(b.computeKubeAPIServerSNIConfig())
b.Shoot.Components.ControlPlane.KubeAPIServer.SetProbeToken(b.APIServerHealthCheckToken)
externalHostname := b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true)
b.Shoot.Components.ControlPlane.KubeAPIServer.SetExternalHostname(externalHostname)
serviceAccountConfig, err := b.computeKubeAPIServerServiceAccountConfig(ctx, b.Shoot.GetInfo().Spec.Kubernetes.KubeAPIServer, externalHostname)
if err != nil {
return err
}
b.Shoot.Components.ControlPlane.KubeAPIServer.SetServiceAccountConfig(serviceAccountConfig)
if err := b.Shoot.Components.ControlPlane.KubeAPIServer.Deploy(ctx); err != nil {
return err
}
// TODO(rfranzke): Remove in a future release.
return kutil.DeleteObjects(ctx, b.K8sSeedClient.Client(),
&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: "audit-policy-config"}},
&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: "kube-apiserver-admission-config"}},
&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: "kube-apiserver-egress-selector-configuration"}},
&corev1.Secret{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: "kube-apiserver-oidc-cabundle"}},
&corev1.Secret{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: "kube-apiserver-service-account-signing-key"}},
)
}
// 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 {
// invalidate shoot client here before deleting API server
if err := b.ClientMap.InvalidateClient(keys.ForShoot(b.Shoot.GetInfo())); err != nil {
return err
}
b.K8sShootClient = nil
return b.Shoot.Components.ControlPlane.KubeAPIServer.Destroy(ctx)
}
// WakeUpKubeAPIServer creates a service and ensures API Server is scaled up
func (b *Botanist) WakeUpKubeAPIServer(ctx context.Context) error {
sniPhase := b.Shoot.Components.ControlPlane.KubeAPIServerSNIPhase.Done()
if err := b.DeployKubeAPIService(ctx, sniPhase); err != nil {
return err
}
if err := b.Shoot.Components.ControlPlane.KubeAPIServerService.Wait(ctx); err != nil {
return err
}
if b.APIServerSNIEnabled() {
if err := b.DeployKubeAPIServerSNI(ctx); err != nil {
return err
}
}
if err := b.DeployKubeAPIServer(ctx); err != nil {
return err
}
if err := kubernetes.ScaleDeployment(ctx, b.K8sSeedClient.Client(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1); err != nil {
return err
}
return b.Shoot.Components.ControlPlane.KubeAPIServer.Wait(ctx)
}
// ScaleKubeAPIServerToOne scales kube-apiserver replicas to one.
func (b *Botanist) ScaleKubeAPIServerToOne(ctx context.Context) error {
return kubernetes.ScaleDeployment(ctx, b.K8sSeedClient.Client(), kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1)
}