// It happens to do this via PersistentPreRunE, which we can disable.
	// We add an additional check in case someone refactors this away, to ensure we don't wipe out non-logging code.
	if fmt.Sprintf("%p", rootCmd.PersistentPreRunE) != fmt.Sprintf("%p", cmd.ConfigureLogging) {
		log.Fatalf("istioctl PersistentPreRunE is not configuring logging")
	}
	rootCmd.PersistentPreRunE = nil
	fErr := rootCmd.Execute()

// getRootCmd returns the root of the cobra command-tree.
func getRootCmd(args []string) *cobra.Command {
	rootCmd := &cobra.Command{
		Use:   "operator",
		Short: "The Istio operator.",
		Args:  cobra.ExactArgs(0),
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			return nil
		},
	}
	rootCmd.SetArgs(args)
	rootCmd.PersistentFlags().AddGoFlagSet(flag.CommandLine)

	rootCmd.AddCommand(serverCmd())

			    └──────────────────────────────────────────────────────────┘

			    You can then repeat the second step on as many other machines as you like.

		`),
		SilenceErrors: true,
		SilenceUsage:  true,
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			if rootfsPath != "" {
				if err := kubeadmutil.Chroot(rootfsPath); err != nil {
					return err
				}
			}
			return nil
		},
	}

			}
			return retval
		},
		PersistentPreRunE: func(c *cobra.Command, args []string) error {
			// istioctl kube-inject is typically redirected to a .yaml file;
			// the default for log messages should be stderr, not stdout
			root := c.Root()
			if root != nil {
				_ = c.Root().PersistentFlags().Set("log_target", "stderr")
			}
			if c.Parent() != nil && c.Parent().PersistentPreRunE != nil {

	rootCmd = &cobra.Command{
		Use:               "server",
		Short:             "Echo server application.",
		SilenceUsage:      true,
		Long:              `Echo application for testing Istio E2E`,
		PersistentPreRunE: configureLogging,
		Run: func(cmd *cobra.Command, args []string) {
			ports := make(common.PortList, len(httpPorts)+len(grpcPorts)+len(tcpPorts)+len(udpPorts)+len(hbonePorts))
			tlsByPort := map[int]bool{}

func GetRootCmd(args []string) *cobra.Command {
	rootCmd := &cobra.Command{
		Use:               "istioctl",
		Short:             "Istio control interface.",
		SilenceUsage:      true,
		DisableAutoGenTag: true,
		PersistentPreRunE: ConfigureLogging,
		Long: `Istio configuration command line utility for service operators to
debug and diagnose their Istio mesh.
`,
	}

	rootCmd.SetArgs(args)

	flags := rootCmd.PersistentFlags()

In general, Echo's gRPC interface (ForwardEcho) should be preferred. This client is only needed in cases
where the network configuration doesn't support gRPC to the source pod.'
`,
		Args:              cobra.ExactArgs(1),
		PersistentPreRunE: configureLogging,
		Run: func(cmd *cobra.Command, args []string) {
			expectSet = cmd.Flags().Changed("expect")
			// Create a request from the flags.
			request, err := getRequest(args[0])
			if err != nil {

others. The API Server services REST operations and provides the frontend to the
cluster's shared state through which all other components interact.`,

		// stop printing usage when the command errors
		SilenceUsage: true,
		PersistentPreRunE: func(*cobra.Command, []string) error {
			// silence client-go warnings.
			// kube-apiserver loopback clients should not log self-issued warnings.
			rest.SetDefaultWarningHandler(rest.NoWarnings{})
			return nil
		},

	return &cobra.Command{
		Use:   "proxy",
		Short: "XDS proxy agent",
		FParseErrWhitelist: cobra.FParseErrWhitelist{
			// Allow unknown flags for backward-compatibility.
			UnknownFlags: true,
		},
		PersistentPreRunE: configureLogging,
		RunE: func(c *cobra.Command, args []string) error {
			cmd.PrintFlags(c.Flags())
			log.Infof("Version %s", version.Info.String())

			raiseLimits()

			err := initProxy(args)

current state towards the desired state. Examples of controllers that ship with
Kubernetes today are the replication controller, endpoints controller, namespace
controller, and serviceaccounts controller.`,
		PersistentPreRunE: func(*cobra.Command, []string) error {
			// silence client-go warnings.
			// kube-controller-manager generically watches APIs (including deprecated ones),