> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/kubernetes-handbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/kubernetes-handbook/gai-nian-yu-yuan-li/cluster/node.md).

# Node

Node是kubernetes集群的工作节点，可以是物理机也可以是虚拟机。

## Node的状态

Node包括如下状态信息：

* Address
  * HostName：可以被kubelet中的`--hostname-override`参数替代。
  * ExternalIP：可以被集群外部路由到的IP地址。
  * InternalIP：集群内部使用的IP，集群外部无法访问。
* Condition
  * OutOfDisk：磁盘空间不足时为`True`
  * Ready：Node controller 40秒内没有收到node的状态报告为`Unknown`，健康为`True`，否则为`False`。
  * MemoryPressure：当node有内存压力时为`True`，否则为`False`。
  * DiskPressure：当node有磁盘压力时为`True`，否则为`False`。
* Capacity
  * CPU
  * 内存
  * 可运行的最大Pod个数
* Info：节点的一些版本信息，如OS、kubernetes、docker等

## Node管理

禁止pod调度到该节点上

```bash
kubectl cordon <node>
```

驱逐该节点上的所有pod

```bash
kubectl drain <node>
```

该命令会删除该节点上的所有Pod（DaemonSet除外），在其他node上重新启动它们，通常该节点需要维护时使用该命令。直接使用该命令会自动调用`kubectl cordon <node>`命令。当该节点维护完成，启动了kubelet后，再使用`kubectl uncordon <node>`即可将该节点添加到kubernetes集群中。


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