kubectl源码分析之create clusterrolebinding

发布一个k8s部署视频：https://edu.youkuaiyun.com/course/detail/26967

课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。

腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518

第二个视频发布  https://edu.youkuaiyun.com/course/detail/27109

腾讯课堂连接地址https://ke.qq.com/course/484107?tuin=ba64518

介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。

第三个视频发布：https://edu.youkuaiyun.com/course/detail/27574

详细介绍helm命令，学习helm chart语法，编写helm chart。深入分析各项目源码，学习编写helm插件

第四个课程发布：https://edu.youkuaiyun.com/course/detail/28488

本课程将详细介绍k8s所有命令，以及命令的go源码分析，学习知其然，知其所以然
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type ClusterRoleBindingOpts struct {//clusterrolebinding结构体
	CreateSubcommandOptions *CreateSubcommandOptions
}

//创建create clusterrolebinding命令
func NewCmdCreateClusterRoleBinding(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	o := &ClusterRoleBindingOpts{//初始化结构体
		CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
	}

	cmd := &cobra.Command{//创建cobra命令
		Use:                   "clusterrolebinding NAME --clusterrole=NAME [--user=username] [--group=groupname] [--serviceaccount=namespace:serviceaccountname] [--dry-run]",
		DisableFlagsInUseLine: true,
		Short:                 i18n.T("Create a ClusterRoleBinding for a particular ClusterRole"),
		Long:                  clusterRoleBindingLong,
		Example:               clusterRoleBindingExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(o.Complete(f, cmd, args))//准备运行
			cmdutil.CheckErr(o.Run())//运行
		},
	}

	o.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)//设置print 选项

	cmdutil.AddApplyAnnotationFlags(cmd)//设置save-config选项
	cmdutil.AddValidateFlags(cmd)//设置validate选项
	cmdutil.AddGeneratorFlags(cmd, generateversioned.ClusterRoleBindingV1GeneratorName)//设置generator选项
	cmd.Flags().String("clusterrole", "", i18n.T("ClusterRole this ClusterRoleBinding should reference"))//设置clusterrole选项
	cmd.MarkFlagCustom("clusterrole", "__kubectl_get_resource_clusterrole")
	cmd.Flags().StringArray("user", []string{}, "Usernames to bind to the clusterrole")//设置user选项
	cmd.Flags().StringArray("group", []string{}, "Groups to bind to the clusterrole")//设置group选项
	cmd.Flags().StringArray("serviceaccount", []string{}, "Service accounts to bind to the clusterrole, in the format <namespace>:<name>")//设置serviceaccount选项
	return cmd
}

//准备运行
func (o *ClusterRoleBindingOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)//获取名称
	if err != nil {
		return err
	}

	var generator generate.StructuredGenerator
	switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
	case generateversioned.ClusterRoleBindingV1GeneratorName://获取generator选项并判断
		generator = &generateversioned.ClusterRoleBindingGeneratorV1{//构造generator对象
			Name:            name,
			ClusterRole:     cmdutil.GetFlagString(cmd, "clusterrole"),
			Users:           cmdutil.GetFlagStringArray(cmd, "user"),
			Groups:          cmdutil.GetFlagStringArray(cmd, "group"),
			ServiceAccounts: cmdutil.GetFlagStringArray(cmd, "serviceaccount"),
		}
	default:
		return errUnsupportedGenerator(cmd, generatorName)
	}

	return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)//运行createSubCommandOption complete方法
}