forked from gardener/gardener
/
gardener_apiserver.go
432 lines (381 loc) · 17.2 KB
/
gardener_apiserver.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 app
import (
"context"
"errors"
"flag"
"fmt"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apiserver/pkg/admission"
openapinamer "k8s.io/apiserver/pkg/endpoints/openapi"
"k8s.io/apiserver/pkg/quota/v1/generic"
genericapiserver "k8s.io/apiserver/pkg/server"
genericoptions "k8s.io/apiserver/pkg/server/options"
"k8s.io/apiserver/pkg/server/resourceconfig"
serverstorage "k8s.io/apiserver/pkg/server/storage"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/client-go/dynamic"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
logsv1 "k8s.io/component-base/logs/api/v1"
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
"k8s.io/klog/v2"
"sigs.k8s.io/controller-runtime/pkg/client"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"github.com/gardener/gardener/pkg/api"
gardencore "github.com/gardener/gardener/pkg/apis/core"
gardencorev1alpha1 "github.com/gardener/gardener/pkg/apis/core/v1alpha1"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/apis/operations"
operationsv1alpha1 "github.com/gardener/gardener/pkg/apis/operations/v1alpha1"
seedmanagementv1alpha1 "github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1"
settingsv1alpha1 "github.com/gardener/gardener/pkg/apis/settings/v1alpha1"
"github.com/gardener/gardener/pkg/apiserver"
admissioninitializer "github.com/gardener/gardener/pkg/apiserver/admission/initializer"
"github.com/gardener/gardener/pkg/apiserver/storage"
gardencoreclientset "github.com/gardener/gardener/pkg/client/core/clientset/internalversion"
gardencoreversionedclientset "github.com/gardener/gardener/pkg/client/core/clientset/versioned"
gardencoreexternalinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/internalversion"
kubernetesclient "github.com/gardener/gardener/pkg/client/kubernetes"
seedmanagementclientset "github.com/gardener/gardener/pkg/client/seedmanagement/clientset/versioned"
seedmanagementinformers "github.com/gardener/gardener/pkg/client/seedmanagement/informers/externalversions"
settingsclientset "github.com/gardener/gardener/pkg/client/settings/clientset/versioned"
settingsinformers "github.com/gardener/gardener/pkg/client/settings/informers/externalversions"
"github.com/gardener/gardener/pkg/logger"
"github.com/gardener/gardener/pkg/openapi"
)
// NewCommandStartGardenerAPIServer creates a *cobra.Command object with default parameters.
func NewCommandStartGardenerAPIServer() *cobra.Command {
opts := NewOptions()
cmd := &cobra.Command{
Use: "gardener-apiserver",
Short: "Launch the Gardener API server",
Long: `In essence, the Gardener is an extension API server along with a bundle
of Kubernetes controllers which introduce new API objects in an existing Kubernetes
cluster (which is called Garden cluster) in order to use them for the management of
further Kubernetes clusters (which are called Shoot clusters).
To do that reliably and to offer a certain quality of service, it requires to control
the main components of a Kubernetes cluster (etcd, API server, controller manager, scheduler).
These so-called control plane components are hosted in Kubernetes clusters themselves
(which are called Seed clusters).`,
RunE: func(c *cobra.Command, args []string) error {
verflag.PrintAndExitIfRequested()
if err := opts.Validate(); err != nil {
return err
}
return opts.Run(c.Context())
},
SilenceUsage: true,
}
flags := cmd.Flags()
verflag.AddFlags(flags)
opts.AddFlags(flags)
// has to be after opts.AddFlags because controller-runtime registers "--kubeconfig" on flag.CommandLine
// see https://github.com/kubernetes-sigs/controller-runtime/blob/v0.8.0/pkg/client/config/config.go#L38
flags.AddGoFlagSet(flag.CommandLine)
return cmd
}
// Options has all the context and parameters needed to run a Gardener API server.
type Options struct {
Recommended *genericoptions.RecommendedOptions
ServerRunOptions *genericoptions.ServerRunOptions
ExtraOptions *apiserver.ExtraOptions
CoreInformerFactory gardencoreinformers.SharedInformerFactory
ExternalCoreInformerFactory gardencoreexternalinformers.SharedInformerFactory
KubeInformerFactory kubeinformers.SharedInformerFactory
SeedManagementInformerFactory seedmanagementinformers.SharedInformerFactory
SettingsInformerFactory settingsinformers.SharedInformerFactory
Logs *logsv1.LoggingConfiguration
}
// NewOptions returns a new Options object.
func NewOptions() *Options {
o := &Options{
Recommended: genericoptions.NewRecommendedOptions(
"/registry-gardener",
api.Codecs.LegacyCodec(
gardencorev1alpha1.SchemeGroupVersion,
seedmanagementv1alpha1.SchemeGroupVersion,
settingsv1alpha1.SchemeGroupVersion,
operationsv1alpha1.SchemeGroupVersion,
),
),
ServerRunOptions: genericoptions.NewServerRunOptions(),
ExtraOptions: &apiserver.ExtraOptions{},
Logs: logsv1.NewLoggingConfiguration(),
}
o.Recommended.Etcd.StorageConfig.EncodeVersioner = runtime.NewMultiGroupVersioner(
gardencorev1beta1.SchemeGroupVersion,
schema.GroupKind{Group: gardencorev1alpha1.GroupName},
schema.GroupKind{Group: gardencorev1beta1.GroupName},
)
apiserver.RegisterAllAdmissionPlugins(o.Recommended.Admission.Plugins)
o.Recommended.Admission.DefaultOffPlugins = apiserver.DefaultOffPlugins
o.Recommended.Admission.RecommendedPluginOrder = apiserver.AllOrderedPlugins
return o
}
// AddFlags adds all flags to the given FlagSet.
func (o *Options) AddFlags(flags *pflag.FlagSet) {
o.Recommended.AddFlags(flags)
o.ServerRunOptions.AddUniversalFlags(flags)
o.ExtraOptions.AddFlags(flags)
logsv1.AddFlags(o.Logs, flags)
}
// Validate validates all the required options.
func (o *Options) Validate() error {
var errs []error
errs = append(errs, o.Recommended.Validate()...)
errs = append(errs, o.ServerRunOptions.Validate()...)
errs = append(errs, o.ExtraOptions.Validate()...)
// Require server certificate specification
keyCert := &o.Recommended.SecureServing.ServerCert.CertKey
if len(keyCert.CertFile) == 0 || len(keyCert.KeyFile) == 0 {
errs = append(errs, errors.New("must specify both --tls-cert-file and --tls-private-key-file"))
}
// Activate logging as soon as possible
if err := logsv1.ValidateAndApply(o.Logs, nil); err != nil {
return err
}
return utilerrors.NewAggregate(errs)
}
func (o *Options) config(kubeAPIServerConfig *rest.Config, kubeClient *kubernetes.Clientset) (*apiserver.Config, error) {
// Create clientset for the owned API groups
// Use loopback config to create a new Kubernetes client for the owned API groups
gardenerAPIServerConfig := genericapiserver.NewRecommendedConfig(api.Codecs)
o.KubeInformerFactory = kubeinformers.NewSharedInformerFactory(kubeClient, kubeAPIServerConfig.Timeout)
// Initialize admission plugins
o.Recommended.ExtraAdmissionInitializers = func(c *genericapiserver.RecommendedConfig) ([]admission.PluginInitializer, error) {
protobufLoopbackConfig := *gardenerAPIServerConfig.LoopbackClientConfig
if protobufLoopbackConfig.ContentType == "" {
protobufLoopbackConfig.ContentType = runtime.ContentTypeProtobuf
}
// core client
coreClient, err := gardencoreclientset.NewForConfig(&protobufLoopbackConfig)
if err != nil {
return nil, err
}
o.CoreInformerFactory = gardencoreinformers.NewSharedInformerFactory(coreClient, protobufLoopbackConfig.Timeout)
// versioned core client
versionedCoreClient, err := gardencoreversionedclientset.NewForConfig(&protobufLoopbackConfig)
if err != nil {
return nil, err
}
o.ExternalCoreInformerFactory = gardencoreexternalinformers.NewSharedInformerFactory(versionedCoreClient, protobufLoopbackConfig.Timeout)
// seedmanagement client
seedManagementClient, err := seedmanagementclientset.NewForConfig(gardenerAPIServerConfig.LoopbackClientConfig)
if err != nil {
return nil, err
}
o.SeedManagementInformerFactory = seedmanagementinformers.NewSharedInformerFactory(seedManagementClient, gardenerAPIServerConfig.LoopbackClientConfig.Timeout)
// settings client
settingsClient, err := settingsclientset.NewForConfig(&protobufLoopbackConfig)
if err != nil {
return nil, err
}
o.SettingsInformerFactory = settingsinformers.NewSharedInformerFactory(settingsClient, protobufLoopbackConfig.Timeout)
// dynamic client
dynamicClient, err := dynamic.NewForConfig(kubeAPIServerConfig)
if err != nil {
return nil, err
}
return []admission.PluginInitializer{
admissioninitializer.New(
o.CoreInformerFactory,
coreClient,
o.ExternalCoreInformerFactory,
versionedCoreClient,
o.SeedManagementInformerFactory,
seedManagementClient,
o.SettingsInformerFactory,
o.KubeInformerFactory,
kubeClient,
dynamicClient,
gardenerAPIServerConfig.Authorization.Authorizer,
// ResourceQuota admission plugin configuration is injected via `ExtraAdmissionInitializers`.
// Ref implementation of Kube-Apiserver:
// https://github.com/kubernetes/kubernetes/blob/53b2973440a29e1682df6ba687cebc6764bba44c/pkg/kubeapiserver/admission/config.go#L70
generic.NewConfiguration(nil, nil),
),
}, nil
}
apiConfig := &apiserver.Config{
GenericConfig: gardenerAPIServerConfig,
ExtraConfig: apiserver.ExtraConfig{},
}
if err := o.ApplyTo(apiConfig); err != nil {
return nil, err
}
return apiConfig, nil
}
// Run runs gardener-apiserver with the given Options.
func (o *Options) Run(ctx context.Context) error {
log, err := logger.NewZapLogger(o.ExtraOptions.LogLevel, o.ExtraOptions.LogFormat)
if err != nil {
return fmt.Errorf("error instantiating zap logger: %w", err)
}
logf.SetLogger(log)
klog.SetLogger(log)
log.Info("Starting gardener-apiserver", "version", version.Get())
log.Info("Feature Gates", "featureGates", utilfeature.DefaultFeatureGate)
// Create clientset for the native Kubernetes API group
// Use remote kubeconfig file (if set) or in-cluster config to create a new Kubernetes client for the native Kubernetes API groups
kubeAPIServerConfig, err := clientcmd.BuildConfigFromFlags("", o.Recommended.CoreAPI.CoreAPIKubeconfigPath)
if err != nil {
return err
}
protobufConfig := *kubeAPIServerConfig
if protobufConfig.ContentType == "" {
protobufConfig.ContentType = runtime.ContentTypeProtobuf
}
// kube client
kubeClient, err := kubernetes.NewForConfig(&protobufConfig)
if err != nil {
return err
}
config, err := o.config(kubeAPIServerConfig, kubeClient)
if err != nil {
return err
}
server, err := config.Complete().New()
if err != nil {
return err
}
if err := server.GenericAPIServer.AddPostStartHook("start-gardener-apiserver-informers", func(context genericapiserver.PostStartHookContext) error {
o.CoreInformerFactory.Start(context.StopCh)
o.ExternalCoreInformerFactory.Start(context.StopCh)
o.KubeInformerFactory.Start(context.StopCh)
o.SeedManagementInformerFactory.Start(context.StopCh)
o.SettingsInformerFactory.Start(context.StopCh)
return nil
}); err != nil {
return err
}
if err := server.GenericAPIServer.AddPostStartHook("bootstrap-garden-cluster", func(context genericapiserver.PostStartHookContext) error {
if _, err := kubeClient.CoreV1().Namespaces().Get(ctx, gardencorev1beta1.GardenerSeedLeaseNamespace, metav1.GetOptions{}); client.IgnoreNotFound(err) != nil {
return err
} else if err == nil {
// Namespace already exists
return nil
}
_, err := kubeClient.CoreV1().Namespaces().Create(ctx, &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: gardencorev1beta1.GardenerSeedLeaseNamespace,
},
}, kubernetesclient.DefaultCreateOptions())
return err
}); err != nil {
return err
}
if err := server.GenericAPIServer.AddPostStartHook("bootstrap-cluster-identity", func(context genericapiserver.PostStartHookContext) error {
if _, err := kubeClient.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(ctx, v1beta1constants.ClusterIdentity, metav1.GetOptions{}); client.IgnoreNotFound(err) != nil {
return err
} else if err == nil {
// Cluster identity ConfigMap already exists
return nil
}
_, err := kubeClient.CoreV1().ConfigMaps(metav1.NamespaceSystem).Create(ctx, &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.ClusterIdentity,
Namespace: metav1.NamespaceSystem,
},
Data: map[string]string{
v1beta1constants.ClusterIdentity: o.ExtraOptions.ClusterIdentity,
},
}, kubernetesclient.DefaultCreateOptions())
return err
}); err != nil {
return err
}
return server.GenericAPIServer.PrepareRun().Run(ctx.Done())
}
// ApplyTo applies the options to the given config.
func (o *Options) ApplyTo(config *apiserver.Config) error {
gardenerAPIServerConfig := config.GenericConfig
gardenerVersion := version.Get()
gardenerAPIServerConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(openapi.GetOpenAPIDefinitions, openapinamer.NewDefinitionNamer(api.Scheme))
gardenerAPIServerConfig.OpenAPIConfig.Info.Title = "Gardener"
gardenerAPIServerConfig.OpenAPIConfig.Info.Version = gardenerVersion.GitVersion
gardenerAPIServerConfig.Version = &gardenerVersion
if err := o.ServerRunOptions.ApplyTo(&gardenerAPIServerConfig.Config); err != nil {
return err
}
if err := o.Recommended.SecureServing.ApplyTo(&gardenerAPIServerConfig.SecureServing, &gardenerAPIServerConfig.LoopbackClientConfig); err != nil {
return err
}
if err := o.Recommended.Authentication.ApplyTo(&gardenerAPIServerConfig.Authentication, gardenerAPIServerConfig.SecureServing, gardenerAPIServerConfig.OpenAPIConfig); err != nil {
return err
}
if err := o.Recommended.Authorization.ApplyTo(&gardenerAPIServerConfig.Authorization); err != nil {
return err
}
if err := o.Recommended.Audit.ApplyTo(&gardenerAPIServerConfig.Config); err != nil {
return err
}
if err := o.Recommended.Features.ApplyTo(&gardenerAPIServerConfig.Config); err != nil {
return err
}
if err := o.Recommended.CoreAPI.ApplyTo(gardenerAPIServerConfig); err != nil {
return err
}
if initializers, err := o.Recommended.ExtraAdmissionInitializers(gardenerAPIServerConfig); err != nil {
return err
} else if err := o.Recommended.Admission.ApplyTo(&gardenerAPIServerConfig.Config, gardenerAPIServerConfig.SharedInformerFactory, gardenerAPIServerConfig.ClientConfig, utilfeature.DefaultFeatureGate, initializers...); err != nil {
return err
}
if err := o.ExtraOptions.ApplyTo(config); err != nil {
return err
}
resourceConfig := serverstorage.NewResourceConfig()
resourceConfig.EnableVersions(
gardencorev1alpha1.SchemeGroupVersion,
seedmanagementv1alpha1.SchemeGroupVersion,
settingsv1alpha1.SchemeGroupVersion,
operationsv1alpha1.SchemeGroupVersion,
)
mergedResourceConfig, err := resourceconfig.MergeAPIResourceConfigs(resourceConfig, nil, api.Scheme)
if err != nil {
return err
}
resourceEncodingConfig := serverstorage.NewDefaultResourceEncodingConfig(api.Scheme)
// TODO: `ShootState` is not yet promoted to `core.gardener.cloud/v1beta1` - this can be removed once `ShootState` got promoted.
resourceEncodingConfig.SetResourceEncoding(gardencore.Resource("shootstates"), gardencorev1alpha1.SchemeGroupVersion, gardencore.SchemeGroupVersion)
resourceEncodingConfig.SetResourceEncoding(operations.Resource("bastions"), operationsv1alpha1.SchemeGroupVersion, operations.SchemeGroupVersion)
// TODO: `ExposureClass` is not yet promoted to `core.gardener.cloud/v1beta1` - this can be removed once `ExposureClass` got promoted.
resourceEncodingConfig.SetResourceEncoding(gardencore.Resource("exposureclasses"), gardencorev1alpha1.SchemeGroupVersion, gardencore.SchemeGroupVersion)
storageFactory := &storage.GardenerStorageFactory{
DefaultStorageFactory: serverstorage.NewDefaultStorageFactory(
o.Recommended.Etcd.StorageConfig,
o.Recommended.Etcd.DefaultStorageMediaType,
api.Codecs,
resourceEncodingConfig,
mergedResourceConfig,
nil,
),
}
if err := o.Recommended.Etcd.Complete(config.GenericConfig.StorageObjectCountTracker, config.GenericConfig.DrainedNotify(), config.GenericConfig.AddPostStartHook); err != nil {
return err
}
return o.Recommended.Etcd.ApplyWithStorageFactoryTo(storageFactory, &gardenerAPIServerConfig.Config)
}