kubeadm init快速搭建k8s源码解析

cmd := &cobra.Command{
   Use:   "init",
   Short: "Run this command in order to set up the Kubernetes control plane",
   RunE: func(cmd *cobra.Command, args []string) error {
      c, err := initRunner.InitData(args)
      if err != nil {
         return err
      }
      data := c.(*initData)
      fmt.Printf("[init] Using Kubernetes version: %s\n", data.cfg.KubernetesVersion)
      return initRunner.Run(args)
   },
   Args: cobra.NoArgs,
}

// add flags to the init command.
// init command local flags could be eventually inherited by the sub-commands automatically generated for phases
AddInitConfigFlags(cmd.Flags(), initOptions.externalInitCfg)
AddClusterConfigFlags(cmd.Flags(), initOptions.externalClusterCfg, &initOptions.featureGatesString)
AddInitOtherFlags(cmd.Flags(), initOptions)
initOptions.bto.AddTokenFlag(cmd.Flags())
initOptions.bto.AddTTLFlag(cmd.Flags())
options.AddImageMetaFlags(cmd.Flags(), &initOptions.externalClusterCfg.ImageRepository)
// defines additional flag that are not used by the init command but that could be eventually used
// by the sub-commands automatically generated for phases
initRunner.SetAdditionalFlags(func(flags *flag.FlagSet) {
   options.AddKubeConfigFlag(flags, &initOptions.kubeconfigPath)
   options.AddKubeConfigDirFlag(flags, &initOptions.kubeconfigDir)
   options.AddControlPlanExtraArgsFlags(flags, &initOptions.externalClusterCfg.APIServer.ExtraArgs, &initOptions.externalClusterCfg.ControllerManager.ExtraArgs, &initOptions.externalClusterCfg.Scheduler.ExtraArgs)
})

// AddInitConfigFlags adds init flags bound to the config to the specified flagset
func AddInitConfigFlags(flagSet *flag.FlagSet, cfg *kubeadmapiv1.InitConfiguration) {
   flagSet.StringVar(
      &cfg.LocalAPIEndpoint.AdvertiseAddress, options.APIServerAdvertiseAddress, cfg.LocalAPIEndpoint.AdvertiseAddress,
      "The IP address the API Server will advertise it's listening on. If not set the default network interface will be used.",
   )
   flagSet.Int32Var(
      &cfg.LocalAPIEndpoint.BindPort, options.APIServerBindPort, cfg.LocalAPIEndpoint.BindPort,
      "Port for the API Server to bind to.",
   )
   flagSet.StringVar(
      &cfg.NodeRegistration.Name, options.NodeName, cfg.NodeRegistration.Name,
      `Specify the node name.`,
   )
   flagSet.StringVar(
      &cfg.CertificateKey, options.CertificateKey, "",
      "Key used to encrypt the control-plane certificates in the kubeadm-certs Secret.",
   )
   cmdutil.AddCRISocketFlag(flagSet, &cfg.NodeRegistration.CRISocket)
}

// initialize the workflow runner with the list of phases
initRunner.AppendPhase(phases.NewPreflightPhase())
initRunner.AppendPhase(phases.NewCertsPhase())
initRunner.AppendPhase(phases.NewKubeConfigPhase())
initRunner.AppendPhase(phases.NewKubeletStartPhase())
initRunner.AppendPhase(phases.NewControlPlanePhase())
initRunner.AppendPhase(phases.NewEtcdPhase())
initRunner.AppendPhase(phases.NewWaitControlPlanePhase())
initRunner.AppendPhase(phases.NewUploadConfigPhase())
initRunner.AppendPhase(phases.NewUploadCertsPhase())
initRunner.AppendPhase(phases.NewMarkControlPlanePhase())
initRunner.AppendPhase(phases.NewBootstrapTokenPhase())
initRunner.AppendPhase(phases.NewKubeletFinalizePhase())
initRunner.AppendPhase(phases.NewAddonPhase())
initRunner.AppendPhase(phases.NewShowJoinCommandPhase())