mirror of
https://github.com/ceph/ceph-csi.git
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355 lines
12 KiB
Go
355 lines
12 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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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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goruntime "runtime"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/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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utilfeature "k8s.io/apiserver/pkg/util/feature"
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storageinformers "k8s.io/client-go/informers/storage/v1"
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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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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/apis/componentconfig"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/features"
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"k8s.io/kubernetes/pkg/scheduler"
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"k8s.io/kubernetes/pkg/scheduler/algorithmprovider"
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schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
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latestschedulerapi "k8s.io/kubernetes/pkg/scheduler/api/latest"
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"k8s.io/kubernetes/pkg/scheduler/factory"
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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/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/spf13/cobra"
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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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glog.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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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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glog.Infof("Wrote configuration to: %s\n", opts.WriteConfigTo)
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return
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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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if err := Run(c.Complete(), stopCh); 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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opts.AddFlags(cmd.Flags())
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cmd.MarkFlagFilename("config", "yaml", "yml", "json")
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return cmd
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}
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func Run(c schedulerserverconfig.CompletedConfig, stopCh <-chan struct{}) error {
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// To help debugging, immediately log version
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glog.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(c.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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// Build a scheduler config from the provided algorithm source.
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schedulerConfig, err := NewSchedulerConfig(c)
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if err != nil {
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return err
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}
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// Create the scheduler.
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sched := scheduler.NewFromConfig(schedulerConfig)
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// Prepare the event broadcaster.
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if c.Broadcaster != nil && c.EventClient != nil {
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c.Broadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: c.EventClient.Events("")})
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}
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// Start up the healthz server.
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if c.InsecureServing != nil {
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separateMetrics := c.InsecureMetricsServing != nil
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handler := buildHandlerChain(newHealthzHandler(&c.ComponentConfig, separateMetrics), nil, nil)
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if err := c.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 c.InsecureMetricsServing != nil {
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handler := buildHandlerChain(newMetricsHandler(&c.ComponentConfig), nil, nil)
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if err := c.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 c.SecureServing != nil {
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handler := buildHandlerChain(newHealthzHandler(&c.ComponentConfig, false), c.Authentication.Authenticator, c.Authorization.Authorizer)
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if err := c.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 healthz server: %v", err)
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}
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}
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// Start all informers.
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go c.PodInformer.Informer().Run(stopCh)
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c.InformerFactory.Start(stopCh)
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// Wait for all caches to sync before scheduling.
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c.InformerFactory.WaitForCacheSync(stopCh)
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controller.WaitForCacheSync("scheduler", stopCh, c.PodInformer.Informer().HasSynced)
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// Prepare a reusable run function.
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run := func(stopCh <-chan struct{}) {
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sched.Run()
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<-stopCh
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}
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// If leader election is enabled, run via LeaderElector until done and exit.
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if c.LeaderElection != nil {
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c.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(*c.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()
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return fmt.Errorf("lost lease")
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}
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// Leader election is disabled, so run inline until done.
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run(stopCh)
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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)
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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 *componentconfig.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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// newHealthzServer 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 *componentconfig.KubeSchedulerConfiguration, separateMetrics bool) http.Handler {
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pathRecorderMux := mux.NewPathRecorderMux("kube-scheduler")
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healthz.InstallHandler(pathRecorderMux)
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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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// NewSchedulerConfig creates the scheduler configuration. This is exposed for use by tests.
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func NewSchedulerConfig(s schedulerserverconfig.CompletedConfig) (*scheduler.Config, error) {
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var storageClassInformer storageinformers.StorageClassInformer
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if utilfeature.DefaultFeatureGate.Enabled(features.VolumeScheduling) {
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storageClassInformer = s.InformerFactory.Storage().V1().StorageClasses()
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}
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// Set up the configurator which can create schedulers from configs.
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configurator := factory.NewConfigFactory(
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s.ComponentConfig.SchedulerName,
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s.Client,
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s.InformerFactory.Core().V1().Nodes(),
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s.PodInformer,
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s.InformerFactory.Core().V1().PersistentVolumes(),
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s.InformerFactory.Core().V1().PersistentVolumeClaims(),
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s.InformerFactory.Core().V1().ReplicationControllers(),
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s.InformerFactory.Extensions().V1beta1().ReplicaSets(),
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s.InformerFactory.Apps().V1beta1().StatefulSets(),
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s.InformerFactory.Core().V1().Services(),
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s.InformerFactory.Policy().V1beta1().PodDisruptionBudgets(),
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storageClassInformer,
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s.ComponentConfig.HardPodAffinitySymmetricWeight,
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utilfeature.DefaultFeatureGate.Enabled(features.EnableEquivalenceClassCache),
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s.ComponentConfig.DisablePreemption,
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)
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source := s.ComponentConfig.AlgorithmSource
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var config *scheduler.Config
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switch {
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case source.Provider != nil:
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// Create the config from a named algorithm provider.
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sc, err := configurator.CreateFromProvider(*source.Provider)
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if err != nil {
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return nil, fmt.Errorf("couldn't create scheduler using provider %q: %v", *source.Provider, err)
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}
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config = sc
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case source.Policy != nil:
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// Create the config from a user specified policy source.
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policy := &schedulerapi.Policy{}
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switch {
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case source.Policy.File != nil:
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// Use a policy serialized in a file.
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policyFile := source.Policy.File.Path
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_, err := os.Stat(policyFile)
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if err != nil {
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return nil, fmt.Errorf("missing policy config file %s", policyFile)
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}
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data, err := ioutil.ReadFile(policyFile)
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if err != nil {
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return nil, fmt.Errorf("couldn't read policy config: %v", err)
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}
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err = runtime.DecodeInto(latestschedulerapi.Codec, []byte(data), policy)
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if err != nil {
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return nil, fmt.Errorf("invalid policy: %v", err)
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}
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case source.Policy.ConfigMap != nil:
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// Use a policy serialized in a config map value.
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policyRef := source.Policy.ConfigMap
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policyConfigMap, err := s.Client.CoreV1().ConfigMaps(policyRef.Namespace).Get(policyRef.Name, metav1.GetOptions{})
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if err != nil {
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return nil, fmt.Errorf("couldn't get policy config map %s/%s: %v", policyRef.Namespace, policyRef.Name, err)
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}
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data, found := policyConfigMap.Data[componentconfig.SchedulerPolicyConfigMapKey]
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if !found {
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return nil, fmt.Errorf("missing policy config map value at key %q", componentconfig.SchedulerPolicyConfigMapKey)
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}
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err = runtime.DecodeInto(latestschedulerapi.Codec, []byte(data), policy)
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if err != nil {
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return nil, fmt.Errorf("invalid policy: %v", err)
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}
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}
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sc, err := configurator.CreateFromConfig(*policy)
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if err != nil {
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return nil, fmt.Errorf("couldn't create scheduler from policy: %v", err)
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}
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config = sc
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default:
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return nil, fmt.Errorf("unsupported algorithm source: %v", source)
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}
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// Additional tweaks to the config produced by the configurator.
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config.Recorder = s.Recorder
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config.DisablePreemption = s.ComponentConfig.DisablePreemption
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return config, nil
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}
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