kubectl是控制k8s clustet manager的命令行工具：
$ kubectl
kubectl controls the Kubernetes cluster manager.
Find more information at https://github.com/kubernetes/kubernetes.
Usage:
kubectl [flags]
kubectl [command]
Available Commands:
get Display one or many resources
describe Show details of a specific resource or group of resources
......
kubectl使用了cobra这个项目作为构建命令行的工具，它包含commands，args和flags的概念：
Commands represent actions, Args are things and Flags are modifiers for those actions.
The pattern to follow is APPNAME VERB NOUN --ADJECTIVE. or APPNAME COMMAND ARG --FLAG
举个例子：
$ kubectl get node --v=10
kubectl是appname，get是command，node是arg，--v=10是flag。
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