管理集群中 ConfigMap 持久化保存的 kubeadm 集群配置
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Manage configuration for a kubeadm cluster persisted in a ConfigMap in the cluster.
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### 概要

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### Synopsis
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There is a ConfigMap in the kube-system namespace called "kubeadm-config" that kubeadm uses to store internal configuration about the
cluster. kubeadm CLI v1.8.0+ automatically creates this ConfigMap with the config used with 'kubeadm init', but if you
initialized your cluster using kubeadm v1.7.x or lower, you must use the 'config upload' command to create this
ConfigMap. This is required so that 'kubeadm upgrade' can configure your upgraded cluster correctly.
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kube-system 命名空间里有一个名为 "kubeadm-config" 的 ConfigMap，kubeadm 用它来存储有关集群的内部配置。
kubeadm CLI v1.8.0+ 通过一个配置自动创建该 ConfigMap，这个配置是和 'kubeadm init' 共用的。但是您如果使用 kubeadm v1.7.x 或更低的版本初始化集群，那么必须使用 'config upload' 命令创建该 ConfigMap。这是必要的操作，目的是使 'kubeadm upgrade' 能够正确地配置升级后的集群。

```
kubeadm config [flags]
```

### 可选项
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      <td colspan="2">-h, --help</td>
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      <td></td><td style="line-height: 130%; word-wrap: break-word;">help for config</td>
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      <td colspan="2">--kubeconfig string&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Default: "/etc/kubernetes/admin.conf"</td>
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      <td></td><td style="line-height: 130%; word-wrap: break-word;">The KubeConfig file to use when talking to the cluster. If the flag is not set, a set of standard locations are searched for an existing KubeConfig file.</td>
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      <td colspan="2">-h, --help</td>
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      <td></td><td style="line-height: 130%; word-wrap: break-word;">配置帮助。</td>
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      <td colspan="2">--kubeconfig string&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;默认值: "/etc/kubernetes/admin.conf"</td>
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      <td></td><td style="line-height: 130%; word-wrap: break-word;">用于和集群通信的 KubeConfig 文件。如果它没有被设置，那么 kubeadm 将会搜索一个已经存在于标准路径的 KubeConfig 文件。</td>
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### 从父命令继承的可选项

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      <td colspan="2">--rootfs string</td>
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      <td></td><td style="line-height: 130%; word-wrap: break-word;">[EXPERIMENTAL] The path to the 'real' host root filesystem.</td>
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      <td colspan="2">--rootfs string</td>
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      <td></td><td style="line-height: 130%; word-wrap: break-word;">[实验] 主机根文件系统的“真实”路径。</td>
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