mirror of
https://github.com/k3s-io/kubernetes.git
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327 lines
11 KiB
Go
327 lines
11 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package app implements a Server object for running the scheduler.
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package app
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"os"
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goruntime "runtime"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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genericapifilters "k8s.io/apiserver/pkg/endpoints/filters"
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apirequest "k8s.io/apiserver/pkg/endpoints/request"
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genericfilters "k8s.io/apiserver/pkg/server/filters"
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"k8s.io/apiserver/pkg/server/healthz"
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"k8s.io/apiserver/pkg/server/mux"
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"k8s.io/apiserver/pkg/server/routes"
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"k8s.io/apiserver/pkg/util/term"
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v1core "k8s.io/client-go/kubernetes/typed/core/v1"
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"k8s.io/client-go/tools/leaderelection"
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cliflag "k8s.io/component-base/cli/flag"
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"k8s.io/component-base/cli/globalflag"
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schedulerserverconfig "k8s.io/kubernetes/cmd/kube-scheduler/app/config"
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"k8s.io/kubernetes/cmd/kube-scheduler/app/options"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/scheduler"
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"k8s.io/kubernetes/pkg/scheduler/algorithmprovider"
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kubeschedulerconfig "k8s.io/kubernetes/pkg/scheduler/apis/config"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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"k8s.io/kubernetes/pkg/scheduler/metrics"
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"k8s.io/kubernetes/pkg/util/configz"
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utilflag "k8s.io/kubernetes/pkg/util/flag"
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"k8s.io/kubernetes/pkg/version"
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"k8s.io/kubernetes/pkg/version/verflag"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/spf13/cobra"
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"k8s.io/klog"
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)
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// NewSchedulerCommand creates a *cobra.Command object with default parameters
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func NewSchedulerCommand() *cobra.Command {
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opts, err := options.NewOptions()
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if err != nil {
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klog.Fatalf("unable to initialize command options: %v", err)
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}
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cmd := &cobra.Command{
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Use: "kube-scheduler",
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Long: `The Kubernetes scheduler is a policy-rich, topology-aware,
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workload-specific function that significantly impacts availability, performance,
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and capacity. The scheduler needs to take into account individual and collective
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resource requirements, quality of service requirements, hardware/software/policy
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constraints, affinity and anti-affinity specifications, data locality, inter-workload
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interference, deadlines, and so on. Workload-specific requirements will be exposed
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through the API as necessary.`,
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Run: func(cmd *cobra.Command, args []string) {
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if err := runCommand(cmd, args, opts); err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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},
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}
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fs := cmd.Flags()
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namedFlagSets := opts.Flags()
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verflag.AddFlags(namedFlagSets.FlagSet("global"))
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globalflag.AddGlobalFlags(namedFlagSets.FlagSet("global"), cmd.Name())
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for _, f := range namedFlagSets.FlagSets {
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fs.AddFlagSet(f)
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}
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usageFmt := "Usage:\n %s\n"
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cols, _, _ := term.TerminalSize(cmd.OutOrStdout())
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cmd.SetUsageFunc(func(cmd *cobra.Command) error {
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fmt.Fprintf(cmd.OutOrStderr(), usageFmt, cmd.UseLine())
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cliflag.PrintSections(cmd.OutOrStderr(), namedFlagSets, cols)
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return nil
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})
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cmd.SetHelpFunc(func(cmd *cobra.Command, args []string) {
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fmt.Fprintf(cmd.OutOrStdout(), "%s\n\n"+usageFmt, cmd.Long, cmd.UseLine())
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cliflag.PrintSections(cmd.OutOrStdout(), namedFlagSets, cols)
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})
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cmd.MarkFlagFilename("config", "yaml", "yml", "json")
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return cmd
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}
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// runCommand runs the scheduler.
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func runCommand(cmd *cobra.Command, args []string, opts *options.Options) error {
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verflag.PrintAndExitIfRequested()
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utilflag.PrintFlags(cmd.Flags())
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if len(args) != 0 {
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fmt.Fprint(os.Stderr, "arguments are not supported\n")
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}
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if errs := opts.Validate(); len(errs) > 0 {
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fmt.Fprintf(os.Stderr, "%v\n", utilerrors.NewAggregate(errs))
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os.Exit(1)
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}
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if len(opts.WriteConfigTo) > 0 {
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if err := options.WriteConfigFile(opts.WriteConfigTo, &opts.ComponentConfig); err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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klog.Infof("Wrote configuration to: %s\n", opts.WriteConfigTo)
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}
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c, err := opts.Config()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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stopCh := make(chan struct{})
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// Get the completed config
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cc := c.Complete()
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// To help debugging, immediately log version
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klog.Infof("Version: %+v", version.Get())
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// Apply algorithms based on feature gates.
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// TODO: make configurable?
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algorithmprovider.ApplyFeatureGates()
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// Configz registration.
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if cz, err := configz.New("componentconfig"); err == nil {
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cz.Set(cc.ComponentConfig)
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} else {
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return fmt.Errorf("unable to register configz: %s", err)
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}
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return Run(cc, stopCh)
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}
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// Run executes the scheduler based on the given configuration. It only return on error or when stopCh is closed.
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func Run(cc schedulerserverconfig.CompletedConfig, stopCh <-chan struct{}) error {
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// To help debugging, immediately log version
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klog.V(1).Infof("Starting Kubernetes Scheduler version %+v", version.Get())
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// Create the scheduler.
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sched, err := scheduler.New(cc.Client,
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cc.InformerFactory.Core().V1().Nodes(),
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cc.PodInformer,
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cc.InformerFactory.Core().V1().PersistentVolumes(),
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cc.InformerFactory.Core().V1().PersistentVolumeClaims(),
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cc.InformerFactory.Core().V1().ReplicationControllers(),
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cc.InformerFactory.Apps().V1().ReplicaSets(),
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cc.InformerFactory.Apps().V1().StatefulSets(),
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cc.InformerFactory.Core().V1().Services(),
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cc.InformerFactory.Policy().V1beta1().PodDisruptionBudgets(),
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cc.InformerFactory.Storage().V1().StorageClasses(),
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cc.Recorder,
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cc.ComponentConfig.AlgorithmSource,
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stopCh,
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framework.NewRegistry(),
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scheduler.WithName(cc.ComponentConfig.SchedulerName),
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scheduler.WithHardPodAffinitySymmetricWeight(cc.ComponentConfig.HardPodAffinitySymmetricWeight),
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scheduler.WithPreemptionDisabled(cc.ComponentConfig.DisablePreemption),
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scheduler.WithPercentageOfNodesToScore(cc.ComponentConfig.PercentageOfNodesToScore),
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scheduler.WithBindTimeoutSeconds(*cc.ComponentConfig.BindTimeoutSeconds))
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if err != nil {
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return err
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}
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// Prepare the event broadcaster.
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if cc.Broadcaster != nil && cc.EventClient != nil {
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cc.Broadcaster.StartLogging(klog.V(6).Infof)
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cc.Broadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: cc.EventClient.Events("")})
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}
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// Setup healthz checks.
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var checks []healthz.HealthzChecker
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if cc.ComponentConfig.LeaderElection.LeaderElect {
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checks = append(checks, cc.LeaderElection.WatchDog)
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}
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// Start up the healthz server.
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if cc.InsecureServing != nil {
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separateMetrics := cc.InsecureMetricsServing != nil
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handler := buildHandlerChain(newHealthzHandler(&cc.ComponentConfig, separateMetrics, checks...), nil, nil)
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if err := cc.InsecureServing.Serve(handler, 0, stopCh); err != nil {
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return fmt.Errorf("failed to start healthz server: %v", err)
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}
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}
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if cc.InsecureMetricsServing != nil {
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handler := buildHandlerChain(newMetricsHandler(&cc.ComponentConfig), nil, nil)
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if err := cc.InsecureMetricsServing.Serve(handler, 0, stopCh); err != nil {
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return fmt.Errorf("failed to start metrics server: %v", err)
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}
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}
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if cc.SecureServing != nil {
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handler := buildHandlerChain(newHealthzHandler(&cc.ComponentConfig, false, checks...), cc.Authentication.Authenticator, cc.Authorization.Authorizer)
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// TODO: handle stoppedCh returned by c.SecureServing.Serve
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if _, err := cc.SecureServing.Serve(handler, 0, stopCh); err != nil {
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// fail early for secure handlers, removing the old error loop from above
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return fmt.Errorf("failed to start secure server: %v", err)
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}
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}
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// Start all informers.
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go cc.PodInformer.Informer().Run(stopCh)
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cc.InformerFactory.Start(stopCh)
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// Wait for all caches to sync before scheduling.
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cc.InformerFactory.WaitForCacheSync(stopCh)
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// Prepare a reusable runCommand function.
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run := func(ctx context.Context) {
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sched.Run()
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<-ctx.Done()
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}
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ctx, cancel := context.WithCancel(context.TODO()) // TODO once Run() accepts a context, it should be used here
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defer cancel()
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go func() {
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select {
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case <-stopCh:
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cancel()
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case <-ctx.Done():
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}
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}()
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// If leader election is enabled, runCommand via LeaderElector until done and exit.
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if cc.LeaderElection != nil {
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cc.LeaderElection.Callbacks = leaderelection.LeaderCallbacks{
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OnStartedLeading: run,
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OnStoppedLeading: func() {
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utilruntime.HandleError(fmt.Errorf("lost master"))
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},
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}
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leaderElector, err := leaderelection.NewLeaderElector(*cc.LeaderElection)
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if err != nil {
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return fmt.Errorf("couldn't create leader elector: %v", err)
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}
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leaderElector.Run(ctx)
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return fmt.Errorf("lost lease")
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}
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// Leader election is disabled, so runCommand inline until done.
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run(ctx)
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return fmt.Errorf("finished without leader elect")
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}
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// buildHandlerChain wraps the given handler with the standard filters.
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func buildHandlerChain(handler http.Handler, authn authenticator.Request, authz authorizer.Authorizer) http.Handler {
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requestInfoResolver := &apirequest.RequestInfoFactory{}
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failedHandler := genericapifilters.Unauthorized(legacyscheme.Codecs, false)
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handler = genericapifilters.WithRequestInfo(handler, requestInfoResolver)
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handler = genericapifilters.WithAuthorization(handler, authz, legacyscheme.Codecs)
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handler = genericapifilters.WithAuthentication(handler, authn, failedHandler, nil)
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handler = genericapifilters.WithRequestInfo(handler, requestInfoResolver)
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handler = genericfilters.WithPanicRecovery(handler)
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return handler
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}
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func installMetricHandler(pathRecorderMux *mux.PathRecorderMux) {
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configz.InstallHandler(pathRecorderMux)
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defaultMetricsHandler := prometheus.Handler().ServeHTTP
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pathRecorderMux.HandleFunc("/metrics", func(w http.ResponseWriter, req *http.Request) {
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if req.Method == "DELETE" {
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metrics.Reset()
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io.WriteString(w, "metrics reset\n")
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return
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}
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defaultMetricsHandler(w, req)
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})
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}
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// newMetricsHandler builds a metrics server from the config.
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func newMetricsHandler(config *kubeschedulerconfig.KubeSchedulerConfiguration) http.Handler {
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pathRecorderMux := mux.NewPathRecorderMux("kube-scheduler")
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installMetricHandler(pathRecorderMux)
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if config.EnableProfiling {
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routes.Profiling{}.Install(pathRecorderMux)
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if config.EnableContentionProfiling {
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goruntime.SetBlockProfileRate(1)
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}
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}
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return pathRecorderMux
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}
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// newHealthzHandler creates a healthz server from the config, and will also
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// embed the metrics handler if the healthz and metrics address configurations
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// are the same.
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func newHealthzHandler(config *kubeschedulerconfig.KubeSchedulerConfiguration, separateMetrics bool, checks ...healthz.HealthzChecker) http.Handler {
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pathRecorderMux := mux.NewPathRecorderMux("kube-scheduler")
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healthz.InstallHandler(pathRecorderMux, checks...)
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if !separateMetrics {
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installMetricHandler(pathRecorderMux)
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}
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if config.EnableProfiling {
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routes.Profiling{}.Install(pathRecorderMux)
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if config.EnableContentionProfiling {
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goruntime.SetBlockProfileRate(1)
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}
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}
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return pathRecorderMux
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}
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