kubectl 源码分析：create priorityclass 命令实现

kubectl create priorityclass 源码解析

在 Kubernetes 中，PriorityClass 用于定义 Pod 的调度优先级。当我们使用 kubectl create priorityclass 命令时，底层是如何处理这些参数的呢？本文梳理了相关源码的执行链路。

命令初始化

入口函数 NewCmdCreatePriorityClass 负责构建 Cobra 命令。它定义了命令的使用方式、别名以及简短描述。

func NewCmdCreatePriorityClass(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	options := &PriorityClassOpts{
		CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
	}

	cmd := &cobra.Command{
		Use:                   "priorityclass NAME --value=VALUE --global-default=BOOL [--dry-run]",
		DisableFlagsInUseLine: true,
		Aliases:               []string{"pc"},
		Short:                 i18n.T("Create a priorityclass with the specified name."),
		Long:                  pcLong,
		Example:               pcExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(options.Complete(f, cmd, args))
			cmdutil.CheckErr(options.Run())
		},
	}

	options.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)
	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddGeneratorFlags(cmd, generateversioned.PriorityClassV1GeneratorName)

	cmd.Flags().Int32("value", 0, i18n.T("the value of this priority class."))
	cmd.Flags().Bool("global-default", false, i18n.T("global-default specifies whether this PriorityClass should be considered as the default priority."))
	cmd.Flags().String("description", "", i18n.T("description is an arbitrary string that usually provides guidelines on when this priority class should be used."))
	cmd.Flags().String("preemption-policy", "", i18n.T("preemption-policy is the policy for preempting pods with lower priority."))
	 cmd
}