142 lines
4.1 KiB
Go
142 lines
4.1 KiB
Go
package app
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import (
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"context"
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"flag"
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"fmt"
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"net"
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"net/http"
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"os"
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"strconv"
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"github.com/google/uuid"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/spf13/cobra"
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"k8s.io/client-go/dynamic"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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"k8s.io/client-go/tools/leaderelection"
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"k8s.io/client-go/tools/leaderelection/resourcelock"
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"k8s.io/klog/v2"
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"github.com/karmada-io/karmada/cmd/scheduler/app/options"
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karmadaclientset "github.com/karmada-io/karmada/pkg/generated/clientset/versioned"
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"github.com/karmada-io/karmada/pkg/scheduler"
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"github.com/karmada-io/karmada/pkg/version"
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"github.com/karmada-io/karmada/pkg/version/sharedcommand"
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)
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// NewSchedulerCommand creates a *cobra.Command object with default parameters
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func NewSchedulerCommand(stopChan <-chan struct{}) *cobra.Command {
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opts := options.NewOptions()
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cmd := &cobra.Command{
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Use: "karmada-scheduler",
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Long: `The karmada scheduler binds resources to the clusters it manages.`,
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RunE: func(cmd *cobra.Command, args []string) error {
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// validate options
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if errs := opts.Validate(); len(errs) != 0 {
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return errs.ToAggregate()
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}
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if err := run(opts, stopChan); err != nil {
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return err
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}
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return nil
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},
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Args: func(cmd *cobra.Command, args []string) error {
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for _, arg := range args {
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if len(arg) > 0 {
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return fmt.Errorf("%q does not take any arguments, got %q", cmd.CommandPath(), args)
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}
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}
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return nil
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},
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}
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// Init log flags
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// TODO(@RainbowMango): Group the flags to "logs" flag set.
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klog.InitFlags(flag.CommandLine)
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opts.AddFlags(cmd.Flags())
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cmd.AddCommand(sharedcommand.NewCmdVersion(os.Stdout, "karmada-scheduler"))
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cmd.Flags().AddGoFlagSet(flag.CommandLine)
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return cmd
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}
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func run(opts *options.Options, stopChan <-chan struct{}) error {
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klog.Infof("karmada-scheduler version: %s", version.Get())
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go serveHealthzAndMetrics(net.JoinHostPort(opts.BindAddress, strconv.Itoa(opts.SecurePort)))
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restConfig, err := clientcmd.BuildConfigFromFlags(opts.Master, opts.KubeConfig)
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if err != nil {
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return fmt.Errorf("error building kubeconfig: %s", err.Error())
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}
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restConfig.QPS, restConfig.Burst = opts.KubeAPIQPS, opts.KubeAPIBurst
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dynamicClientSet := dynamic.NewForConfigOrDie(restConfig)
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karmadaClient := karmadaclientset.NewForConfigOrDie(restConfig)
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kubeClientSet := kubernetes.NewForConfigOrDie(restConfig)
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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<-stopChan
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cancel()
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}()
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sched := scheduler.NewScheduler(dynamicClientSet, karmadaClient, kubeClientSet, opts)
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if !opts.LeaderElection.LeaderElect {
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sched.Run(ctx)
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return fmt.Errorf("scheduler exited")
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}
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leaderElectionClient, err := kubernetes.NewForConfig(rest.AddUserAgent(restConfig, "leader-election"))
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if err != nil {
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return err
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}
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hostname, err := os.Hostname()
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if err != nil {
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return fmt.Errorf("unable to get hostname: %v", err)
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}
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// add a uniquifier so that two processes on the same host don't accidentally both become active
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id := hostname + "_" + uuid.New().String()
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rl, err := resourcelock.New(opts.LeaderElection.ResourceLock,
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opts.LeaderElection.ResourceNamespace,
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opts.LeaderElection.ResourceName,
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leaderElectionClient.CoreV1(),
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leaderElectionClient.CoordinationV1(),
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resourcelock.ResourceLockConfig{
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Identity: id,
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})
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if err != nil {
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return fmt.Errorf("couldn't create resource lock: %v", err)
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}
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leaderelection.RunOrDie(ctx, leaderelection.LeaderElectionConfig{
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Lock: rl,
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LeaseDuration: opts.LeaderElection.LeaseDuration.Duration,
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RenewDeadline: opts.LeaderElection.RenewDeadline.Duration,
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RetryPeriod: opts.LeaderElection.RetryPeriod.Duration,
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Callbacks: leaderelection.LeaderCallbacks{
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OnStartedLeading: sched.Run,
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OnStoppedLeading: func() {
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klog.Fatalf("leaderelection lost")
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},
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},
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})
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return nil
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}
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func serveHealthzAndMetrics(address string) {
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http.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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_, _ = w.Write([]byte("ok"))
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})
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http.Handle("/metrics", promhttp.Handler())
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klog.Fatal(http.ListenAndServe(address, nil))
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}
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