forked from gardener/gardener
/
app.go
521 lines (451 loc) · 18.8 KB
/
app.go
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// Copyright (c) 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 app
import (
"context"
"fmt"
"os"
goruntime "runtime"
"time"
"github.com/go-logr/logr"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
certificatesv1 "k8s.io/api/certificates/v1"
coordinationv1 "k8s.io/api/coordination/v1"
corev1 "k8s.io/api/core/v1"
eventsv1 "k8s.io/api/events/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/rest"
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/cluster"
controllerconfigv1alpha1 "sigs.k8s.io/controller-runtime/pkg/config/v1alpha1"
"sigs.k8s.io/controller-runtime/pkg/healthz"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"github.com/gardener/gardener/cmd/gardenlet/app/bootstrappers"
"github.com/gardener/gardener/pkg/api/indexer"
"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"
"github.com/gardener/gardener/pkg/client/kubernetes"
clientmapbuilder "github.com/gardener/gardener/pkg/client/kubernetes/clientmap/builder"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/controllerutils/routes"
"github.com/gardener/gardener/pkg/gardenlet/apis/config"
confighelper "github.com/gardener/gardener/pkg/gardenlet/apis/config/helper"
"github.com/gardener/gardener/pkg/gardenlet/bootstrap"
"github.com/gardener/gardener/pkg/gardenlet/bootstrap/certificate"
"github.com/gardener/gardener/pkg/gardenlet/controller"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
gardenerhealthz "github.com/gardener/gardener/pkg/healthz"
"github.com/gardener/gardener/pkg/logger"
"github.com/gardener/gardener/pkg/resourcemanager/controller/garbagecollector/references"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/flow"
gutil "github.com/gardener/gardener/pkg/utils/gardener"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Name is a const for the name of this component.
const Name = "gardenlet"
// NewCommand creates a new cobra.Command for running gardenlet.
func NewCommand() *cobra.Command {
opts := &options{}
cmd := &cobra.Command{
Use: Name,
Short: "Launch the " + Name,
Args: cobra.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
verflag.PrintAndExitIfRequested()
if err := opts.complete(); err != nil {
return err
}
if err := opts.validate(); err != nil {
return err
}
log, err := logger.NewZapLogger(opts.config.LogLevel, opts.config.LogFormat)
if err != nil {
return fmt.Errorf("error instantiating zap logger: %w", err)
}
logf.SetLogger(log)
klog.SetLogger(log)
log.Info("Starting "+Name, "version", version.Get())
cmd.Flags().VisitAll(func(flag *pflag.Flag) {
log.Info(fmt.Sprintf("FLAG: --%s=%s", flag.Name, flag.Value)) //nolint:logcheck
})
// don't output usage on further errors raised during execution
cmd.SilenceUsage = true
// further errors will be logged properly, don't duplicate
cmd.SilenceErrors = true
ctx, cancel := context.WithCancel(cmd.Context())
return run(ctx, cancel, log, opts.config)
},
}
flags := cmd.Flags()
verflag.AddFlags(flags)
opts.addFlags(flags)
return cmd
}
func run(ctx context.Context, cancel context.CancelFunc, log logr.Logger, cfg *config.GardenletConfiguration) error {
// Add feature flags
if err := gardenletfeatures.FeatureGate.SetFromMap(cfg.FeatureGates); err != nil {
return err
}
log.Info("Feature Gates", "featureGates", gardenletfeatures.FeatureGate.String())
if kubeconfig := os.Getenv("GARDEN_KUBECONFIG"); kubeconfig != "" {
cfg.GardenClientConnection.Kubeconfig = kubeconfig
}
if kubeconfig := os.Getenv("KUBECONFIG"); kubeconfig != "" {
cfg.SeedClientConnection.Kubeconfig = kubeconfig
}
log.Info("Getting rest config for seed")
seedRESTConfig, err := kubernetes.RESTConfigFromClientConnectionConfiguration(&cfg.SeedClientConnection.ClientConnectionConfiguration, nil)
if err != nil {
return err
}
log.Info("Setting up manager")
mgr, err := manager.New(seedRESTConfig, manager.Options{
Logger: log,
Scheme: kubernetes.SeedScheme,
GracefulShutdownTimeout: pointer.Duration(5 * time.Second),
HealthProbeBindAddress: fmt.Sprintf("%s:%d", cfg.Server.HealthProbes.BindAddress, cfg.Server.HealthProbes.Port),
MetricsBindAddress: fmt.Sprintf("%s:%d", cfg.Server.Metrics.BindAddress, cfg.Server.Metrics.Port),
LeaderElection: cfg.LeaderElection.LeaderElect,
LeaderElectionResourceLock: cfg.LeaderElection.ResourceLock,
LeaderElectionID: cfg.LeaderElection.ResourceName,
LeaderElectionNamespace: cfg.LeaderElection.ResourceNamespace,
LeaderElectionReleaseOnCancel: true,
LeaseDuration: &cfg.LeaderElection.LeaseDuration.Duration,
RenewDeadline: &cfg.LeaderElection.RenewDeadline.Duration,
RetryPeriod: &cfg.LeaderElection.RetryPeriod.Duration,
Controller: controllerconfigv1alpha1.ControllerConfigurationSpec{
RecoverPanic: pointer.Bool(true),
},
ClientDisableCacheFor: []client.Object{
&corev1.Event{},
&eventsv1.Event{},
},
})
if err != nil {
return err
}
log.Info("Setting up periodic health manager")
healthGracePeriod := time.Duration((*cfg.Controllers.Seed.LeaseResyncSeconds)*(*cfg.Controllers.Seed.LeaseResyncMissThreshold)) * time.Second
healthManager := gardenerhealthz.NewPeriodicHealthz(clock.RealClock{}, healthGracePeriod)
healthManager.Set(true)
log.Info("Setting up health check endpoints")
if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil {
return err
}
if err := mgr.AddHealthzCheck("periodic-health", gardenerhealthz.CheckerFunc(healthManager)); err != nil {
return err
}
if err := mgr.AddReadyzCheck("seed-informer-sync", gardenerhealthz.NewCacheSyncHealthz(mgr.GetCache())); err != nil {
return err
}
if cfg.Debugging != nil && cfg.Debugging.EnableProfiling {
if err := (routes.Profiling{}).AddToManager(mgr); err != nil {
return fmt.Errorf("failed adding profiling handlers to manager: %w", err)
}
if cfg.Debugging.EnableContentionProfiling {
goruntime.SetBlockProfileRate(1)
}
}
log.Info("Adding runnables to manager for bootstrapping")
kubeconfigBootstrapResult := &bootstrappers.KubeconfigBootstrapResult{}
if err := mgr.Add(&controllerutils.ControlledRunner{
Manager: mgr,
BootstrapRunnables: []manager.Runnable{
&bootstrappers.SeedConfigChecker{
SeedClient: mgr.GetClient(),
SeedConfig: cfg.SeedConfig,
},
&bootstrappers.GardenKubeconfig{
SeedClient: mgr.GetClient(),
Log: mgr.GetLogger().WithName("bootstrap"),
Config: cfg,
Result: kubeconfigBootstrapResult,
},
// TODO(rfranzke): Remove this in a future version.
// Ensure all existing ETCD encryption secrets get the 'garbage-collectable' label. There was a bug which
// prevented this from happening, see https://github.com/gardener/gardener/pull/7244.
manager.RunnableFunc(func(ctx context.Context) error {
secretList := &corev1.SecretList{}
if err := mgr.GetClient().List(ctx, secretList, client.MatchingLabels{v1beta1constants.LabelRole: v1beta1constants.SecretNamePrefixETCDEncryptionConfiguration}); err != nil {
return err
}
var tasks []flow.TaskFn
for _, obj := range secretList.Items {
secret := obj
tasks = append(tasks, func(ctx context.Context) error {
patch := client.MergeFrom(secret.DeepCopy())
metav1.SetMetaDataLabel(&secret.ObjectMeta, references.LabelKeyGarbageCollectable, references.LabelValueGarbageCollectable)
return mgr.GetClient().Patch(ctx, &secret, patch)
})
}
return flow.Parallel(tasks...)(ctx)
}),
},
ActualRunnables: []manager.Runnable{
&garden{
cancel: cancel,
mgr: mgr,
config: cfg,
healthManager: healthManager,
kubeconfigBootstrapResult: kubeconfigBootstrapResult,
},
},
}); err != nil {
return fmt.Errorf("failed adding runnables to manager: %w", err)
}
log.Info("Starting manager")
return mgr.Start(ctx)
}
type garden struct {
cancel context.CancelFunc
mgr manager.Manager
config *config.GardenletConfiguration
healthManager gardenerhealthz.Manager
kubeconfigBootstrapResult *bootstrappers.KubeconfigBootstrapResult
}
func (g *garden) Start(ctx context.Context) error {
log := g.mgr.GetLogger()
log.Info("Getting rest config for garden")
gardenRESTConfig, err := kubernetes.RESTConfigFromClientConnectionConfiguration(&g.config.GardenClientConnection.ClientConnectionConfiguration, g.kubeconfigBootstrapResult.Kubeconfig)
if err != nil {
return err
}
log.Info("Setting up cluster object for garden")
gardenCluster, err := cluster.New(gardenRESTConfig, func(opts *cluster.Options) {
opts.Scheme = kubernetes.GardenScheme
opts.Logger = log
// gardenlet does not have the required RBAC permissions for listing/watching the following resources, so let's
// prevent any attempts to cache them.
opts.ClientDisableCacheFor = []client.Object{
&gardencorev1alpha1.ExposureClass{},
&gardencorev1alpha1.ShootState{},
&gardencorev1beta1.CloudProfile{},
&gardencorev1beta1.ControllerDeployment{},
&gardencorev1beta1.Project{},
&gardencorev1beta1.SecretBinding{},
&certificatesv1.CertificateSigningRequest{},
&coordinationv1.Lease{},
&corev1.Namespace{},
&corev1.ConfigMap{},
&corev1.Event{},
&eventsv1.Event{},
}
opts.NewCache = func(config *rest.Config, opts cache.Options) (cache.Cache, error) {
// gardenlet should watch only objects which are related to the seed it is responsible for.
opts.SelectorsByObject = map[client.Object]cache.ObjectSelector{
&gardencorev1beta1.ControllerInstallation{}: {
Field: fields.SelectorFromSet(fields.Set{core.SeedRefName: g.config.SeedConfig.SeedTemplate.Name}),
},
&operationsv1alpha1.Bastion{}: {
Field: fields.SelectorFromSet(fields.Set{operations.BastionSeedName: g.config.SeedConfig.SeedTemplate.Name}),
},
}
// gardenlet should watch secrets only in the seed namespace of the seed it is responsible for. We don't use
// the above selector mechanism here since we want to still fall back to reading secrets with the API reader
// (i.e., not from cache) in case the respective secret is not found in the cache. This is realized by this
// aggregator cache we are using here.
return kubernetes.AggregatorCacheFunc(
kubernetes.NewRuntimeCache,
map[client.Object]cache.NewCacheFunc{
&corev1.Secret{}: cache.MultiNamespacedCacheBuilder([]string{gutil.ComputeGardenNamespace(g.kubeconfigBootstrapResult.SeedName)}),
},
kubernetes.GardenScheme,
)(config, opts)
}
// The created multi-namespace cache does not fall back to an uncached reader in case the gardenlet tries to
// read a secret from another namespace. There might be secrets in namespace other than the seed-specific
// namespace (e.g., backup secret in the SeedSpec). Hence, let's use a fallback client which falls back to an
// uncached reader in case it fails to read objects from the cache.
opts.NewClient = func(cache cache.Cache, config *rest.Config, options client.Options, uncachedObjects ...client.Object) (client.Client, error) {
uncachedClient, err := client.New(config, options)
if err != nil {
return nil, err
}
delegatingClient, err := client.NewDelegatingClient(client.NewDelegatingClientInput{
CacheReader: cache,
Client: uncachedClient,
UncachedObjects: uncachedObjects,
})
if err != nil {
return nil, err
}
return &kubernetes.FallbackClient{
Client: delegatingClient,
Reader: uncachedClient,
}, nil
}
})
if err != nil {
return fmt.Errorf("failed creating garden cluster object: %w", err)
}
log.Info("Cleaning bootstrap authentication data used to request a certificate if needed")
if len(g.kubeconfigBootstrapResult.CSRName) > 0 && len(g.kubeconfigBootstrapResult.SeedName) > 0 {
if err := bootstrap.DeleteBootstrapAuth(ctx, gardenCluster.GetClient(), gardenCluster.GetClient(), g.kubeconfigBootstrapResult.CSRName, g.kubeconfigBootstrapResult.SeedName); err != nil {
return fmt.Errorf("failed cleaning bootstrap auth data: %w", err)
}
}
log.Info("Adding field indexes to informers")
if err := addAllFieldIndexes(ctx, gardenCluster.GetFieldIndexer()); err != nil {
return fmt.Errorf("failed adding indexes: %w", err)
}
log.Info("Adding garden cluster to manager")
if err := g.mgr.Add(gardenCluster); err != nil {
return fmt.Errorf("failed adding garden cluster to manager: %w", err)
}
log.Info("Registering Seed object in garden cluster")
if err := g.registerSeed(ctx, gardenCluster.GetClient()); err != nil {
return err
}
log.Info("Updating last operation status of processing Shoots to 'Aborted'")
if err := g.updateProcessingShootStatusToAborted(ctx, gardenCluster.GetClient()); err != nil {
return err
}
log.Info("Setting up shoot client map")
shootClientMap, err := clientmapbuilder.
NewShootClientMapBuilder().
WithGardenClient(gardenCluster.GetClient()).
WithSeedClient(g.mgr.GetClient()).
WithClientConnectionConfig(&g.config.ShootClientConnection.ClientConnectionConfiguration).
Build(log)
if err != nil {
return fmt.Errorf("failed to build shoot ClientMap: %w", err)
}
log.Info("Adding runnables now that bootstrapping is finished")
runnables := []manager.Runnable{
g.healthManager,
shootClientMap,
}
if g.config.GardenClientConnection.KubeconfigSecret != nil {
certificateManager, err := certificate.NewCertificateManager(log, gardenCluster, g.mgr.GetClient(), g.config)
if err != nil {
return fmt.Errorf("failed to create a new certificate manager: %w", err)
}
runnables = append(runnables, manager.RunnableFunc(func(ctx context.Context) error {
return certificateManager.ScheduleCertificateRotation(ctx, g.cancel, g.mgr.GetEventRecorderFor("certificate-manager"))
}))
}
if err := controllerutils.AddAllRunnables(g.mgr, runnables...); err != nil {
return err
}
log.Info("Adding controllers to manager")
if err := controller.AddToManager(
ctx,
g.mgr,
gardenCluster,
g.mgr,
shootClientMap,
g.config,
g.healthManager,
); err != nil {
return fmt.Errorf("failed adding controllers to manager: %w", err)
}
return nil
}
func (g *garden) registerSeed(ctx context.Context, gardenClient client.Client) error {
seed := &gardencorev1beta1.Seed{
ObjectMeta: metav1.ObjectMeta{
Name: g.config.SeedConfig.Name,
},
}
// Convert gardenlet config to an external version
cfg, err := confighelper.ConvertGardenletConfigurationExternal(g.config)
if err != nil {
return fmt.Errorf("could not convert gardenlet configuration: %w", err)
}
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, gardenClient, seed, func() error {
seed.Labels = utils.MergeStringMaps(map[string]string{
v1beta1constants.GardenRole: v1beta1constants.GardenRoleSeed,
}, g.config.SeedConfig.Labels)
seed.Spec = cfg.SeedConfig.Spec
return nil
}); err != nil {
return fmt.Errorf("could not register seed %q: %w", seed.Name, err)
}
// Verify that the gardener-controller-manager has created the seed-specific namespace. Here we also accept
// 'forbidden' errors since the SeedAuthorizer (if enabled) forbid the gardenlet to read the namespace in case the
// gardener-controller-manager has not yet created it.
timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
return wait.PollUntilWithContext(timeoutCtx, 500*time.Millisecond, func(context.Context) (done bool, err error) {
if err := gardenClient.Get(ctx, kutil.Key(gutil.ComputeGardenNamespace(g.config.SeedConfig.Name)), &corev1.Namespace{}); err != nil {
if apierrors.IsNotFound(err) || apierrors.IsForbidden(err) {
return false, nil
}
return false, err
}
return true, nil
})
}
func (g *garden) updateProcessingShootStatusToAborted(ctx context.Context, gardenClient client.Client) error {
shoots := &gardencorev1beta1.ShootList{}
if err := gardenClient.List(ctx, shoots); err != nil {
return err
}
var taskFns []flow.TaskFn
for _, shoot := range shoots.Items {
if specSeedName, statusSeedName := gutil.GetShootSeedNames(&shoot); gutil.GetResponsibleSeedName(specSeedName, statusSeedName) != g.config.SeedConfig.Name {
continue
}
// Check if the status indicates that an operation is processing and mark it as "aborted".
if shoot.Status.LastOperation == nil || shoot.Status.LastOperation.State != gardencorev1beta1.LastOperationStateProcessing {
continue
}
taskFns = append(taskFns, func(ctx context.Context) error {
patch := client.MergeFrom(shoot.DeepCopy())
shoot.Status.LastOperation.State = gardencorev1beta1.LastOperationStateAborted
if err := gardenClient.Status().Patch(ctx, &shoot, patch); err != nil {
return fmt.Errorf("failed to set status to 'Aborted' for shoot %q: %w", client.ObjectKeyFromObject(&shoot), err)
}
return nil
})
}
return flow.Parallel(taskFns...)(ctx)
}
func addAllFieldIndexes(ctx context.Context, i client.FieldIndexer) error {
for _, fn := range []func(context.Context, client.FieldIndexer) error{
// core API group
indexer.AddShootSeedName,
indexer.AddShootStatusSeedName,
indexer.AddBackupBucketSeedName,
indexer.AddBackupEntrySeedName,
indexer.AddBackupEntryBucketName,
indexer.AddControllerInstallationSeedRefName,
indexer.AddControllerInstallationRegistrationRefName,
// operations API group
indexer.AddBastionShootName,
// seedmanagement API group
indexer.AddManagedSeedShootName,
} {
if err := fn(ctx, i); err != nil {
return err
}
}
return nil
}