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app.go
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app.go
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// Copyright 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"
"net"
"net/http"
"os"
goruntime "runtime"
"strconv"
"time"
"github.com/go-logr/logr"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"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/client"
controllerconfig "sigs.k8s.io/controller-runtime/pkg/config"
"sigs.k8s.io/controller-runtime/pkg/healthz"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
controllerwebhook "sigs.k8s.io/controller-runtime/pkg/webhook"
"github.com/gardener/gardener/cmd/gardener-operator/app/bootstrappers"
extensionswebhook "github.com/gardener/gardener/extensions/pkg/webhook"
"github.com/gardener/gardener/extensions/pkg/webhook/certificates"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/controllerutils/routes"
"github.com/gardener/gardener/pkg/features"
gardenerhealthz "github.com/gardener/gardener/pkg/healthz"
"github.com/gardener/gardener/pkg/logger"
"github.com/gardener/gardener/pkg/operator/apis/config"
operatorclient "github.com/gardener/gardener/pkg/operator/client"
"github.com/gardener/gardener/pkg/operator/controller"
"github.com/gardener/gardener/pkg/operator/webhook"
)
// Name is a const for the name of this component.
const Name = "gardener-operator"
// NewCommand creates a new cobra.Command for running gardener-operator.
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
return run(cmd.Context(), log, opts.config)
},
}
flags := cmd.Flags()
verflag.AddFlags(flags)
opts.addFlags(flags)
return cmd
}
func run(ctx context.Context, log logr.Logger, cfg *config.OperatorConfiguration) error {
log.Info("Feature Gates", "featureGates", features.DefaultFeatureGate)
log.Info("Getting rest config")
if kubeconfig := os.Getenv("KUBECONFIG"); kubeconfig != "" {
cfg.RuntimeClientConnection.Kubeconfig = kubeconfig
}
restConfig, err := kubernetes.RESTConfigFromClientConnectionConfiguration(&cfg.RuntimeClientConnection, nil, kubernetes.AuthTokenFile)
if err != nil {
return err
}
var extraHandlers map[string]http.Handler
if cfg.Debugging != nil && cfg.Debugging.EnableProfiling {
extraHandlers = routes.ProfilingHandlers
if cfg.Debugging.EnableContentionProfiling {
goruntime.SetBlockProfileRate(1)
}
}
log.Info("Setting up manager")
mgr, err := manager.New(restConfig, manager.Options{
Logger: log,
Scheme: operatorclient.RuntimeScheme,
GracefulShutdownTimeout: pointer.Duration(5 * time.Second),
HealthProbeBindAddress: net.JoinHostPort(cfg.Server.HealthProbes.BindAddress, strconv.Itoa(cfg.Server.HealthProbes.Port)),
Metrics: metricsserver.Options{
BindAddress: net.JoinHostPort(cfg.Server.Metrics.BindAddress, strconv.Itoa(cfg.Server.Metrics.Port)),
ExtraHandlers: extraHandlers,
},
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: controllerconfig.Controller{
RecoverPanic: pointer.Bool(true),
},
WebhookServer: controllerwebhook.NewServer(controllerwebhook.Options{
Host: cfg.Server.Webhooks.BindAddress,
Port: cfg.Server.Webhooks.Port,
CertDir: "/tmp/gardener-operator-cert",
}),
})
if err != nil {
return err
}
log.Info("Setting up health check endpoints")
if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil {
return err
}
if err := mgr.AddReadyzCheck("informer-sync", gardenerhealthz.NewCacheSyncHealthz(mgr.GetCache())); err != nil {
return err
}
if err := mgr.AddReadyzCheck("webhook-server", mgr.GetWebhookServer().StartedChecker()); err != nil {
return err
}
log.Info("Perform Gardener version verification")
if err := bootstrappers.VerifyGardenerVersion(ctx, mgr.GetLogger(), mgr.GetAPIReader()); err != nil {
return fmt.Errorf("failed verifying Gardener version: %w", err)
}
log.Info("Adding certificate management to manager")
mode, url := extensionswebhook.ModeService, os.Getenv("WEBHOOK_URL")
if v := os.Getenv("WEBHOOK_MODE"); v != "" {
mode = v
}
var (
validatingWebhookConfiguration = webhook.GetValidatingWebhookConfiguration(mode, url)
mutatingWebhookConfiguration = webhook.GetMutatingWebhookConfiguration(mode, url)
)
if err := certificates.AddCertificateManagementToManager(
ctx,
mgr,
clock.RealClock{},
[]client.Object{validatingWebhookConfiguration, mutatingWebhookConfiguration},
nil,
nil,
nil,
"",
Name,
v1beta1constants.GardenNamespace,
mode,
url,
); err != nil {
return fmt.Errorf("failed adding webhook certificate management to manager: %w", err)
}
log.Info("Adding webhook config reconciliation func to manager")
if err := mgr.Add(reconcileWebhookConfigurations(ctx, mgr, validatingWebhookConfiguration, mutatingWebhookConfiguration)); err != nil {
return fmt.Errorf("failed adding webhook config reconciliation func: %w", err)
}
log.Info("Adding webhook handlers to manager")
if err := webhook.AddToManager(mgr); err != nil {
return fmt.Errorf("failed adding webhook handlers to manager: %w", err)
}
log.Info("Adding controllers to manager")
if err := controller.AddToManager(ctx, mgr, cfg); err != nil {
return fmt.Errorf("failed adding controllers to manager: %w", err)
}
log.Info("Starting manager")
return mgr.Start(ctx)
}
func reconcileWebhookConfigurations(
ctx context.Context,
mgr manager.Manager,
validatingWebhookConfiguration *admissionregistrationv1.ValidatingWebhookConfiguration,
mutatingWebhookConfiguration *admissionregistrationv1.MutatingWebhookConfiguration,
) manager.RunnableFunc {
return func(context.Context) error {
mgr.GetLogger().Info("Reconciling webhook configurations",
"validatingWebhookConfiguration", client.ObjectKeyFromObject(validatingWebhookConfiguration),
"mutatingWebhookConfiguration", client.ObjectKeyFromObject(mutatingWebhookConfiguration),
)
valWebhook := &admissionregistrationv1.ValidatingWebhookConfiguration{ObjectMeta: metav1.ObjectMeta{Name: validatingWebhookConfiguration.Name}}
if _, err := controllerutils.CreateOrGetAndStrategicMergePatch(ctx, mgr.GetClient(), valWebhook, func() error {
// The CA bundle is updated asynchronously by a separate certificates reconciler. Hence, when we update the
// webhook configuration here, let's make sure to not overwrite existing CA bundles in the webhooks.
if err := extensionswebhook.InjectCABundleIntoWebhookConfig(validatingWebhookConfiguration, getCurrentCABundle(valWebhook)); err != nil {
return err
}
valWebhook.Webhooks = validatingWebhookConfiguration.Webhooks
return nil
}); err != nil {
return err
}
mutWebhook := &admissionregistrationv1.MutatingWebhookConfiguration{ObjectMeta: metav1.ObjectMeta{Name: mutatingWebhookConfiguration.Name}}
if _, err := controllerutils.CreateOrGetAndStrategicMergePatch(ctx, mgr.GetClient(), mutWebhook, func() error {
// The CA bundle is updated asynchronously by a separate certificates reconciler. Hence, when we update the
// webhook configuration here, let's make sure to not overwrite existing CA bundles in the webhooks.
if err := extensionswebhook.InjectCABundleIntoWebhookConfig(mutatingWebhookConfiguration, getCurrentCABundle(mutWebhook)); err != nil {
return err
}
mutWebhook.Webhooks = mutatingWebhookConfiguration.Webhooks
return nil
}); err != nil {
return err
}
validatingWebhookConfiguration = valWebhook
mutatingWebhookConfiguration = mutWebhook
return nil
}
}
func getCurrentCABundle(webhookConfig client.Object) []byte {
// All webhooks in this configuration are served by the same endpoint, hence they all have to use the same CA
// bundle. We simply take the first bundle we find and consider it the current bundle for all webhooks.
switch config := webhookConfig.(type) {
case *admissionregistrationv1.MutatingWebhookConfiguration:
for _, w := range config.Webhooks {
if len(w.ClientConfig.CABundle) > 0 {
return w.ClientConfig.CABundle
}
}
case *admissionregistrationv1.ValidatingWebhookConfiguration:
for _, w := range config.Webhooks {
if len(w.ClientConfig.CABundle) > 0 {
return w.ClientConfig.CABundle
}
}
case *admissionregistrationv1beta1.MutatingWebhookConfiguration:
for _, w := range config.Webhooks {
if len(w.ClientConfig.CABundle) > 0 {
return w.ClientConfig.CABundle
}
}
case *admissionregistrationv1beta1.ValidatingWebhookConfiguration:
for _, w := range config.Webhooks {
if len(w.ClientConfig.CABundle) > 0 {
return w.ClientConfig.CABundle
}
}
}
return nil
}