mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-26 13:29:11 +01:00
126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
/*
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Copyright 2017 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 descheduler.
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package app
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import (
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"context"
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"io"
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"os/signal"
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"syscall"
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"github.com/spf13/cobra"
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"sigs.k8s.io/descheduler/cmd/descheduler/app/options"
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"sigs.k8s.io/descheduler/pkg/descheduler"
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"sigs.k8s.io/descheduler/pkg/tracing"
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"k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/watch"
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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/component-base/featuregate"
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"k8s.io/component-base/logs"
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logsapi "k8s.io/component-base/logs/api/v1"
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_ "k8s.io/component-base/logs/json/register"
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"k8s.io/component-base/metrics/legacyregistry"
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"k8s.io/klog/v2"
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)
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// NewDeschedulerCommand creates a *cobra.Command object with default parameters
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func NewDeschedulerCommand(out io.Writer) *cobra.Command {
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s, err := options.NewDeschedulerServer()
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if err != nil {
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klog.ErrorS(err, "unable to initialize server")
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}
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featureGate := featuregate.NewFeatureGate()
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logConfig := logsapi.NewLoggingConfiguration()
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cmd := &cobra.Command{
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Use: "descheduler",
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Short: "descheduler",
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Long: "The descheduler evicts pods which may be bound to less desired nodes",
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PreRunE: func(cmd *cobra.Command, args []string) error {
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logs.InitLogs()
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if logsapi.ValidateAndApply(logConfig, featureGate); err != nil {
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return err
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}
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descheduler.SetupPlugins()
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return nil
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},
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RunE: func(cmd *cobra.Command, args []string) error {
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if err = s.Apply(); err != nil {
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klog.ErrorS(err, "failed to apply")
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return err
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}
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if err = Run(cmd.Context(), s); err != nil {
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klog.ErrorS(err, "failed to run descheduler server")
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return err
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}
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return nil
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},
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}
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cmd.SetOut(out)
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flags := cmd.Flags()
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s.AddFlags(flags)
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runtime.Must(logsapi.AddFeatureGates(featureGate))
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logsapi.AddFlags(logConfig, flags)
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return cmd
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}
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func Run(rootCtx context.Context, rs *options.DeschedulerServer) error {
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ctx, done := signal.NotifyContext(rootCtx, syscall.SIGINT, syscall.SIGTERM)
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pathRecorderMux := mux.NewPathRecorderMux("descheduler")
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if !rs.DisableMetrics {
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pathRecorderMux.Handle("/metrics", legacyregistry.HandlerWithReset())
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}
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healthz.InstallHandler(pathRecorderMux, healthz.NamedCheck("Descheduler", healthz.PingHealthz.Check))
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stoppedCh, _, err := rs.SecureServingInfo.Serve(pathRecorderMux, 0, ctx.Done())
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if err != nil {
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klog.Fatalf("failed to start secure server: %v", err)
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return err
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}
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err = tracing.NewTracerProvider(ctx, rs.Tracing.CollectorEndpoint, rs.Tracing.TransportCert, rs.Tracing.ServiceName, rs.Tracing.ServiceNamespace, rs.Tracing.SampleRate, rs.Tracing.FallbackToNoOpProviderOnError)
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if err != nil {
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klog.ErrorS(err, "failed to create tracer provider")
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}
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defer tracing.Shutdown(ctx)
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// increase the fake watch channel so the dry-run mode can be run
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// over a cluster with thousands of pods
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watch.DefaultChanSize = 100000
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err = descheduler.Run(ctx, rs)
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if err != nil {
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return err
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}
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done()
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// wait for metrics server to close
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<-stoppedCh
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return nil
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}
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