---
title: 卷健康监测
content_type: concept
weight: 100
---
<!-- 
reviewers:
- jsafrane
- saad-ali
- msau42
- xing-yang
title: Volume Health Monitoring
content_type: concept
weight: 100
-->

<!-- overview -->

{{< feature-state for_k8s_version="v1.21" state="alpha" >}}

<!--
{{< glossary_tooltip text="CSI" term_id="csi" >}} volume health monitoring allows
CSI Drivers to detect abnormal volume conditions from the underlying storage systems
and report them as events on {{< glossary_tooltip text="PVCs" term_id="persistent-volume-claim" >}}
or {{< glossary_tooltip text="Pods" term_id="pod" >}}.
-->
{{< glossary_tooltip text="CSI" term_id="csi" >}} 卷健康监测支持 CSI 驱动从底层的存储系统着手，
探测异常的卷状态，并以事件的形式上报到 {{< glossary_tooltip text="PVC" term_id="persistent-volume-claim" >}}
或 {{< glossary_tooltip text="Pod" term_id="pod" >}}.

<!-- body -->

<!--
## Volume health monitoring
-->
## 卷健康监测 {#volume-health-monitoring}

<!--
Kubernetes _volume health monitoring_ is part of how Kubernetes implements the
Container Storage Interface (CSI). Volume health monitoring feature is implemented
in two components: an External Health Monitor controller, and the
{{< glossary_tooltip term_id="kubelet" text="kubelet" >}}.

If a CSI Driver supports Volume Health Monitoring feature from the controller side,
an event will be reported on the related
{{< glossary_tooltip text="PersistentVolumeClaim" term_id="persistent-volume-claim" >}} (PVC)
when an abnormal volume condition is detected on a CSI volume.
-->
Kubernetes **卷健康监测**是 Kubernetes 容器存储接口（CSI）实现的一部分。
卷健康监测特性由两个组件实现：外部健康监测控制器和 {{< glossary_tooltip term_id="kubelet" text="kubelet" >}}。

如果 CSI 驱动器通过控制器的方式支持卷健康监测特性，那么只要在 CSI 卷上监测到异常卷状态，就会在
{{< glossary_tooltip text="PersistentVolumeClaim" term_id="persistent-volume-claim" >}} (PVC)
中上报一个事件。

<!--
The External Health Monitor {{< glossary_tooltip text="controller" term_id="controller" >}}
also watches for node failure events. You can enable node failure monitoring by setting
the `enable-node-watcher` flag to true. When the external health monitor detects a node
failure event, the controller reports an Event will be reported on the PVC to indicate
that pods using this PVC are on a failed node.

If a CSI Driver supports Volume Health Monitoring feature from the node side,
an Event will be reported on every Pod using the PVC when an abnormal volume
condition is detected on a CSI volume. In addition, Volume Health information
is exposed as Kubelet VolumeStats metrics. A new metric kubelet_volume_stats_health_status_abnormal
is added. This metric includes two labels: `namespace` and `persistentvolumeclaim`.
The count is either 1 or 0. 1 indicates the volume is unhealthy, 0 indicates volume
is healthy. For more information, please check
[KEP](https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1432-volume-health-monitor#kubelet-metrics-changes).
-->
外部健康监测{{< glossary_tooltip text="控制器" term_id="controller" >}}也会监测节点失效事件。
如果要启动节点失效监测功能，你可以设置标志 `enable-node-watcher` 为 `true`。
当外部健康监测器检测到节点失效事件，控制器会报送一个事件，该事件会在 PVC 上继续上报，
以表明使用此 PVC 的 Pod 正位于一个失效的节点上。

如果 CSI 驱动程序支持节点侧的卷健康检测，那当在 CSI 卷上检测到异常卷时，
会在使用该 PVC 的每个 Pod 上触发一个事件。
此外，卷运行状况信息作为 Kubelet VolumeStats 指标公开。
添加了一个新的指标 kubelet_volume_stats_health_status_abnormal。
该指标包括两个标签：`namespace` 和 `persistentvolumeclaim`。
计数为 1 或 0。1 表示卷不正常，0 表示卷正常。更多信息请访问
[KEP](https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1432-volume-health-monitor#kubelet-metrics-changes)。

<!--
You need to enable the `CSIVolumeHealth` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/)
to use this feature from the node side.
-->
{{< note >}}
你需要启用 `CSIVolumeHealth`
[特性门控](/zh-cn/docs/reference/command-line-tools-reference/feature-gates/)，
才能在节点上使用此特性。
{{< /note >}}

## {{% heading "whatsnext" %}}

<!--
See the [CSI driver documentation](https://kubernetes-csi.github.io/docs/drivers.html)
to find out which CSI drivers have implemented this feature.
-->
参阅 [CSI 驱动程序文档](https://kubernetes-csi.github.io/docs/drivers.html)，
可以找出有哪些 CSI 驱动程序实现了此特性。