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app.go
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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"
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
"k8s.io/klog/v2"
"k8s.io/utils/pointer"
"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/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils/routes"
gardenerhealthz "github.com/gardener/gardener/pkg/healthz"
"github.com/gardener/gardener/pkg/logger"
"github.com/gardener/gardener/pkg/scheduler/apis/config"
"github.com/gardener/gardener/pkg/scheduler/controller"
schedulerfeatures "github.com/gardener/gardener/pkg/scheduler/features"
)
// Name is a const for the name of this component.
const Name = "gardener-scheduler"
// NewCommand creates a new cobra.Command for running gardener-scheduler.
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.SchedulerConfiguration) error {
// Add feature flags
if err := schedulerfeatures.FeatureGate.SetFromMap(cfg.FeatureGates); err != nil {
return fmt.Errorf("failed to set feature gates: %w", err)
}
log.Info("Feature Gates", "featureGates", schedulerfeatures.FeatureGate.String())
log.Info("Getting rest config")
if kubeconfig := os.Getenv("KUBECONFIG"); kubeconfig != "" {
cfg.ClientConnection.Kubeconfig = kubeconfig
}
restCfg, err := kubernetes.RESTConfigFromClientConnectionConfiguration(&cfg.ClientConnection, nil, kubernetes.AuthTokenFile)
if err != nil {
return err
}
log.Info("Setting up manager")
mgr, err := manager.New(restCfg, manager.Options{
Logger: log,
Scheme: kubernetes.GardenScheme,
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,
})
if 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 health check endpoints to manager")
if err := mgr.AddReadyzCheck("informer-sync", gardenerhealthz.NewCacheSyncHealthz(mgr.GetCache())); err != nil {
return err
}
if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil {
return err
}
log.Info("Adding controllers to manager")
if err := controller.AddToManager(mgr, cfg); err != nil {
return fmt.Errorf("failed adding controllers to manager: %w", err)
}
log.Info("Starting manager")
return mgr.Start(ctx)
}