kubebuilder 生成crd controller，那段代码是连接到k8s api server的-DPDK中文网

在使用Kubebuilder生成CRD Controller时，连接到Kubernetes API Server的代码通常位于main.go文件中。以下是一个示例代码片段：

import (
	"flag"
	"os"

	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	"github.com/example/mysample/api/v1alpha1"
	"github.com/example/mysample/controllers"
	// ...

	k8sruntime "k8s.io/apimachinery/pkg/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	ctrlruntimescheme "sigs.k8s.io/controller-runtime/pkg/client/config/scheme"
)

var (
	scheme   = k8sruntime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
)

func init() {
	_ = clientgoscheme.AddToScheme(scheme)

	_ = v1alpha1.AddToScheme(scheme)
	// ...
}

func main() {
	var metricsAddr string
	var enableLeaderElection bool
	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")

	opts := zap.Options{
		Development: true,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
    Scheme:             scheme,
    MetricsBindAddress: metricsAddr,
    LeaderElection:     enableLeaderElection,
    Port:               9443,
    // ...
  })
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	if err = (&controllers.MySampleReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("MySample"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "MySample")
		os.Exit(1)
  }

	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
  }
}

在这个示例中，使用ctrl.NewManager()函数连接到Kubernetes API Server，并创建一个新的Controller Manager。然后，通过(&controllers.MySampleReconciler{})传入必要的参数来设置CRD Controller。最后，调用mgr.Start(ctrl.SetupSignalHandler())启动Controller Manager并监听信号以优雅地关闭应用程序。

请注意，上述代码只是示例之一，实际情况可能因项目结构和需求而有所不同。你需要根据自己的项目进行适当的调整和修改。

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