/
kubeapiserver.go
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/
kubeapiserver.go
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// Copyright 2023 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 shared
import (
"context"
"fmt"
"slices"
"github.com/Masterminds/semver/v3"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
admissionapiv1 "k8s.io/pod-security-admission/admission/api/v1"
admissionapiv1alpha1 "k8s.io/pod-security-admission/admission/api/v1alpha1"
admissionapiv1beta1 "k8s.io/pod-security-admission/admission/api/v1beta1"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/imagevector"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/component/apiserver"
kubeapiserver "github.com/gardener/gardener/pkg/component/kubernetes/apiserver"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
imagevectorutils "github.com/gardener/gardener/pkg/utils/imagevector"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
)
var (
runtimeScheme *runtime.Scheme
codec runtime.Codec
)
func init() {
runtimeScheme = runtime.NewScheme()
utilruntime.Must(admissionapiv1alpha1.AddToScheme(runtimeScheme))
utilruntime.Must(admissionapiv1beta1.AddToScheme(runtimeScheme))
utilruntime.Must(admissionapiv1.AddToScheme(runtimeScheme))
var (
ser = json.NewSerializerWithOptions(json.DefaultMetaFactory, runtimeScheme, runtimeScheme, json.SerializerOptions{
Yaml: true,
Pretty: false,
Strict: false,
})
versions = schema.GroupVersions([]schema.GroupVersion{
admissionapiv1alpha1.SchemeGroupVersion,
admissionapiv1beta1.SchemeGroupVersion,
admissionapiv1.SchemeGroupVersion,
})
)
codec = serializer.NewCodecFactory(runtimeScheme).CodecForVersions(ser, ser, versions, versions)
}
// NewKubeAPIServer returns a deployer for the kube-apiserver.
func NewKubeAPIServer(
ctx context.Context,
runtimeClientSet kubernetes.Interface,
resourceConfigClient client.Client,
runtimeNamespace string,
objectMeta metav1.ObjectMeta,
runtimeVersion *semver.Version,
targetVersion *semver.Version,
secretsManager secretsmanager.Interface,
namePrefix string,
apiServerConfig *gardencorev1beta1.KubeAPIServerConfig,
autoscalingConfig apiserver.AutoscalingConfig,
serviceNetworkCIDR string,
vpnConfig kubeapiserver.VPNConfig,
priorityClassName string,
isWorkerless bool,
staticTokenKubeconfigEnabled *bool,
auditWebhookConfig *apiserver.AuditWebhook,
authenticationWebhookConfig *kubeapiserver.AuthenticationWebhook,
authorizationWebhookConfig *kubeapiserver.AuthorizationWebhook,
resourcesToStoreInETCDEvents []schema.GroupResource,
) (
kubeapiserver.Interface,
error,
) {
images, err := computeKubeAPIServerImages(runtimeVersion, targetVersion, vpnConfig)
if err != nil {
return nil, err
}
var (
enabledAdmissionPlugins = kubernetesutils.GetAdmissionPluginsForVersion(targetVersion.String())
disabledAdmissionPlugins []gardencorev1beta1.AdmissionPlugin
apiAudiences = []string{"kubernetes", "gardener"}
auditConfig *apiserver.AuditConfig
defaultNotReadyTolerationSeconds *int64
defaultUnreachableTolerationSeconds *int64
eventTTL *metav1.Duration
featureGates map[string]bool
oidcConfig *gardencorev1beta1.OIDCConfig
requests *gardencorev1beta1.APIServerRequests
runtimeConfig map[string]bool
watchCacheSizes *gardencorev1beta1.WatchCacheSizes
logging *gardencorev1beta1.APIServerLogging
)
if apiServerConfig != nil {
enabledAdmissionPlugins = computeEnabledAPIServerAdmissionPlugins(enabledAdmissionPlugins, apiServerConfig.AdmissionPlugins)
disabledAdmissionPlugins = computeDisabledAPIServerAdmissionPlugins(apiServerConfig.AdmissionPlugins)
enabledAdmissionPlugins, err = ensureKubeAPIServerAdmissionPluginConfig(enabledAdmissionPlugins)
if err != nil {
return nil, err
}
if apiServerConfig.APIAudiences != nil {
apiAudiences = apiServerConfig.APIAudiences
if !slices.Contains(apiAudiences, v1beta1constants.GardenerAudience) {
apiAudiences = append(apiAudiences, v1beta1constants.GardenerAudience)
}
}
auditConfig, err = computeAPIServerAuditConfig(ctx, resourceConfigClient, objectMeta, apiServerConfig.AuditConfig, auditWebhookConfig)
if err != nil {
return nil, err
}
defaultNotReadyTolerationSeconds = apiServerConfig.DefaultNotReadyTolerationSeconds
defaultUnreachableTolerationSeconds = apiServerConfig.DefaultUnreachableTolerationSeconds
eventTTL = apiServerConfig.EventTTL
featureGates = apiServerConfig.FeatureGates
logging = apiServerConfig.Logging
oidcConfig = apiServerConfig.OIDCConfig
requests = apiServerConfig.Requests
runtimeConfig = apiServerConfig.RuntimeConfig
watchCacheSizes = apiServerConfig.WatchCacheSizes
}
enabledAdmissionPluginConfigs, err := convertToAdmissionPluginConfigs(ctx, resourceConfigClient, objectMeta.Namespace, enabledAdmissionPlugins)
if err != nil {
return nil, err
}
return kubeapiserver.New(
runtimeClientSet,
runtimeNamespace,
secretsManager,
kubeapiserver.Values{
Values: apiserver.Values{
EnabledAdmissionPlugins: enabledAdmissionPluginConfigs,
DisabledAdmissionPlugins: disabledAdmissionPlugins,
Audit: auditConfig,
Autoscaling: autoscalingConfig,
FeatureGates: featureGates,
Logging: logging,
Requests: requests,
RuntimeVersion: runtimeVersion,
WatchCacheSizes: watchCacheSizes,
},
AnonymousAuthenticationEnabled: v1beta1helper.AnonymousAuthenticationEnabled(apiServerConfig),
APIAudiences: apiAudiences,
AuthenticationWebhook: authenticationWebhookConfig,
AuthorizationWebhook: authorizationWebhookConfig,
DefaultNotReadyTolerationSeconds: defaultNotReadyTolerationSeconds,
DefaultUnreachableTolerationSeconds: defaultUnreachableTolerationSeconds,
EventTTL: eventTTL,
Images: images,
IsWorkerless: isWorkerless,
NamePrefix: namePrefix,
OIDC: oidcConfig,
PriorityClassName: priorityClassName,
ResourcesToStoreInETCDEvents: resourcesToStoreInETCDEvents,
RuntimeConfig: runtimeConfig,
ServiceNetworkCIDR: serviceNetworkCIDR,
StaticTokenKubeconfigEnabled: staticTokenKubeconfigEnabled,
Version: targetVersion,
VPN: vpnConfig,
},
), nil
}
// DeployKubeAPIServer deploys the Kubernetes API server.
func DeployKubeAPIServer(
ctx context.Context,
runtimeClient client.Client,
runtimeNamespace string,
kubeAPIServer kubeapiserver.Interface,
serviceAccountConfig kubeapiserver.ServiceAccountConfig,
serverCertificateConfig kubeapiserver.ServerCertificateConfig,
sniConfig kubeapiserver.SNIConfig,
externalHostname string,
externalServer string,
nodeNetworkCIDR *string,
resourcesToEncrypt []string,
encryptedResources []string,
etcdEncryptionKeyRotationPhase gardencorev1beta1.CredentialsRotationPhase,
wantScaleDown bool,
) error {
var (
values = kubeAPIServer.GetValues()
deploymentName = values.NamePrefix + v1beta1constants.DeploymentNameKubeAPIServer
)
deployment := &appsv1.Deployment{}
if err := runtimeClient.Get(ctx, kubernetesutils.Key(runtimeNamespace, deploymentName), deployment); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
deployment = nil
}
kubeAPIServer.SetAutoscalingReplicas(computeKubeAPIServerReplicas(values.Autoscaling, deployment, wantScaleDown))
if deployment != nil && values.Autoscaling.HVPAEnabled {
for _, container := range deployment.Spec.Template.Spec.Containers {
if container.Name == kubeapiserver.ContainerNameKubeAPIServer {
// Only set requests to allow limits to be removed
kubeAPIServer.SetAutoscalingAPIServerResources(corev1.ResourceRequirements{Requests: container.Resources.Requests})
break
}
}
}
kubeAPIServer.SetServerCertificateConfig(serverCertificateConfig)
kubeAPIServer.SetServiceAccountConfig(serviceAccountConfig)
kubeAPIServer.SetSNIConfig(sniConfig)
kubeAPIServer.SetExternalHostname(externalHostname)
kubeAPIServer.SetExternalServer(externalServer)
kubeAPIServer.SetNodeNetworkCIDR(nodeNetworkCIDR)
etcdEncryptionConfig, err := computeAPIServerETCDEncryptionConfig(
ctx,
runtimeClient,
runtimeNamespace,
deploymentName,
etcdEncryptionKeyRotationPhase,
append(resourcesToEncrypt, sets.List(gardenerutils.DefaultResourcesForEncryption())...),
append(encryptedResources, sets.List(gardenerutils.DefaultResourcesForEncryption())...),
)
if err != nil {
return err
}
kubeAPIServer.SetETCDEncryptionConfig(etcdEncryptionConfig)
if err := kubeAPIServer.Deploy(ctx); err != nil {
return err
}
return handleETCDEncryptionKeyRotation(ctx, runtimeClient, runtimeNamespace, deploymentName, kubeAPIServer, etcdEncryptionConfig, etcdEncryptionKeyRotationPhase)
}
func computeKubeAPIServerImages(
runtimeVersion *semver.Version,
targetVersion *semver.Version,
vpnConfig kubeapiserver.VPNConfig,
) (
kubeapiserver.Images,
error,
) {
var result kubeapiserver.Images
imageKubeAPIServer, err := imagevector.ImageVector().FindImage(imagevector.ImageNameKubeApiserver, imagevectorutils.RuntimeVersion(runtimeVersion.String()), imagevectorutils.TargetVersion(targetVersion.String()))
if err != nil {
return kubeapiserver.Images{}, err
}
result.KubeAPIServer = imageKubeAPIServer.String()
if vpnConfig.HighAvailabilityEnabled {
imageVPNClient, err := imagevector.ImageVector().FindImage(imagevector.ImageNameVpnShootClient, imagevectorutils.RuntimeVersion(runtimeVersion.String()), imagevectorutils.TargetVersion(targetVersion.String()))
if err != nil {
return kubeapiserver.Images{}, err
}
result.VPNClient = imageVPNClient.String()
}
return result, nil
}
func ensureKubeAPIServerAdmissionPluginConfig(plugins []gardencorev1beta1.AdmissionPlugin) ([]gardencorev1beta1.AdmissionPlugin, error) {
var index = -1
for i, plugin := range plugins {
if plugin.Name == "PodSecurity" {
index = i
break
}
}
if index == -1 {
return plugins, nil
}
// If user has set a config in the shoot spec, retrieve it
if plugins[index].Config != nil {
var (
admissionConfigData []byte
err error
)
config, err := runtime.Decode(codec, plugins[index].Config.Raw)
if err != nil {
return nil, err
}
// Add kube-system to exempted namespaces
switch admissionConfig := config.(type) {
case *admissionapiv1alpha1.PodSecurityConfiguration:
if !slices.Contains(admissionConfig.Exemptions.Namespaces, metav1.NamespaceSystem) {
admissionConfig.Exemptions.Namespaces = append(admissionConfig.Exemptions.Namespaces, metav1.NamespaceSystem)
}
admissionConfigData, err = runtime.Encode(codec, admissionConfig)
case *admissionapiv1beta1.PodSecurityConfiguration:
if !slices.Contains(admissionConfig.Exemptions.Namespaces, metav1.NamespaceSystem) {
admissionConfig.Exemptions.Namespaces = append(admissionConfig.Exemptions.Namespaces, metav1.NamespaceSystem)
}
admissionConfigData, err = runtime.Encode(codec, admissionConfig)
case *admissionapiv1.PodSecurityConfiguration:
if !slices.Contains(admissionConfig.Exemptions.Namespaces, metav1.NamespaceSystem) {
admissionConfig.Exemptions.Namespaces = append(admissionConfig.Exemptions.Namespaces, metav1.NamespaceSystem)
}
admissionConfigData, err = runtime.Encode(codec, admissionConfig)
default:
err = fmt.Errorf("expected admissionapiv1alpha1.PodSecurityConfiguration, admissionapiv1beta1.PodSecurityConfiguration or admissionapiv1.PodSecurityConfiguration in PodSecurity plugin configuration but got %T", config)
}
if err != nil {
return nil, err
}
plugins[index].Config = &runtime.RawExtension{Raw: admissionConfigData}
}
return plugins, nil
}
func computeKubeAPIServerReplicas(autoscalingConfig apiserver.AutoscalingConfig, deployment *appsv1.Deployment, wantScaleDown bool) *int32 {
switch {
case autoscalingConfig.Replicas != nil:
// If the replicas were already set then don't change them.
return autoscalingConfig.Replicas
case deployment == nil && !wantScaleDown:
// 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 wantScaleDown && (deployment == nil || deployment.Spec.Replicas == nil || *deployment.Spec.Replicas == 0):
// If the scale down is desired 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 ptr.To[int32](0)
default:
// If none of the above cases applies then a default value has to be returned.
return ptr.To[int32](1)
}
}