Change:
<ins> --- title: Downward API content_type: concept description: > 有两种方法可以将 Pod 和容器字段暴露给运行中的容器：环境变量和由特殊卷类型承载的文件。 这两种暴露 Pod 和容器字段的方法统称为 Downward API。 --- <!-- title: Downward API content_type: concept description: > There are two ways to expose Pod and container fields to a running container: environment variables, and as files that are populated by a special volume type. Together, these two ways of exposing Pod and container fields are called the downward API. --> <!-- overview --> <!-- It is sometimes useful for a container to have information about itself, without being overly coupled to Kubernetes. The _downward API_ allows containers to consume information about themselves or the cluster without using the Kubernetes client or API server. --> 对于容器来说，在不与 Kubernetes 过度耦合的情况下，拥有关于自身的信息有时是很有用的。 **Downward API** 允许容器在不使用 Kubernetes 客户端或 API 服务器的情况下获得自己或集群的信息。 <!-- An example is an existing application that assumes a particular well-known environment variable holds a unique identifier. One possibility is to wrap the application, but that is tedious and error-prone, and it violates the goal of low coupling. A better option would be to use the Pod's name as an identifier, and inject the Pod's name into the well-known environment variable. --> 例如，现有应用程序假设某特定的周知的环境变量是存在的，其中包含唯一标识符。 一种方法是对应用程序进行封装，但这很繁琐且容易出错，并且违背了低耦合的目标。 更好的选择是使用 Pod 名称作为标识符，并将 Pod 名称注入到周知的环境变量中。 <!-- In Kubernetes, there are two ways to expose Pod and container fields to a running container: * as [environment variables](/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#the-downward-api) * as [files in a `downwardAPI` volume](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) --> 在 Kubernetes 中，有两种方法可以将 Pod 和容器字段暴露给运行中的容器： * 作为[环境变量](/zh-cn/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#the-downward-api) * 作为 [`downwardAPI` 卷中的文件](/zh-cn/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) <!-- Together, these two ways of exposing Pod and container fields are called the _downward API_. --> 这两种暴露 Pod 和容器字段的方式统称为 **Downward API**。 <!-- body --> <!-- ## Available fields Only some Kubernetes API fields are available through the downward API. This section lists which fields you can make available. --> ## 可用字段  {#available-fields} 只有部分 Kubernetes API 字段可以通过 Downward API 使用。本节列出了你可以使用的字段。 <!-- You can pass information from available Pod-level fields using `fieldRef`. At the API level, the `spec` for a Pod always defines at least one [Container](/docs/reference/kubernetes-api/workload-resources/pod-v1/#Container). You can pass information from available Container-level fields using `resourceFieldRef`. --> 你可以使用 `fieldRef` 传递来自可用的 Pod 级字段的信息。在 API 层面，一个 Pod 的 `spec` 总是定义了至少一个 [Container](/zh-cn/docs/reference/kubernetes-api/workload-resources/pod-v1/#Container)。 你可以使用 `resourceFieldRef` 传递来自可用的 Container 级字段的信息。 <!-- ### Information available via `fieldRef` {#downwardapi-fieldRef} For most Pod-level fields, you can provide them to a container either as an environment variable or using a `downwardAPI` volume. The fields available via either mechanism are: --> ### 可通过 `fieldRef` 获得的信息  {#downwardapi-fieldRef} 对于大多数 Pod 级别的字段，你可以将它们作为环境变量或使用 `downwardAPI` 卷提供给容器。 通过这两种机制可用的字段有： <!-- `metadata.name` : the pod's name --> `metadata.name` : Pod 的名称 <!-- `metadata.namespace` : the pod's {{< glossary_tooltip text="namespace" term_id="namespace" >}} --> `metadata.namespace` : Pod 的{{< glossary_tooltip text="命名空间" term_id="namespace" >}} <!-- `metadata.uid` : the pod's unique ID --> `metadata.uid` : Pod 的唯一 ID <!-- `metadata.annotations['<KEY>']` : the value of the pod's {{< glossary_tooltip text="annotation" term_id="annotation" >}} named `<KEY>` (for example, `metadata.annotations['myannotation']`) --> `metadata.annotations['<KEY>']` : Pod 的{{< glossary_tooltip text="注解" term_id="annotation" >}} `<KEY>` 的值（例如：`metadata.annotations['myannotation']`） <!-- `metadata.labels['<KEY>']` : the text value of the pod's {{< glossary_tooltip text="label" term_id="label" >}} named `<KEY>` (for example, `metadata.labels['mylabel']`) --> `metadata.labels['<KEY>']` : Pod 的{{< glossary_tooltip text="标签" term_id="label" >}} `<KEY>` 的值（例如：`metadata.labels['mylabel']`） <!-- `spec.serviceAccountName` : the name of the pod's {{< glossary_tooltip text="service account" term_id="service-account" >}} --> `spec.serviceAccountName` : Pod 的{{< glossary_tooltip text="服务账号" term_id="service-account" >}}名称 <!-- `spec.nodeName` : the name of the {{< glossary_tooltip term_id="node" text="node">}} where the Pod is executing --> `spec.nodeName` : Pod 运行时所处的{{< glossary_tooltip term_id="node" text="节点">}}名称 <!-- `status.hostIP` : the primary IP address of the node to which the Pod is assigned --> `status.hostIP` : Pod 所在节点的主 IP 地址 <!-- `status.podIP` : the pod's primary IP address (usually, its IPv4 address) --> `status.podIP` : Pod 的主 IP 地址（通常是其 IPv4 地址） <!-- In addition, the following information is available through a `downwardAPI` volume `fieldRef`, but **not as environment variables**: --> 此外，以下信息可以通过 `downwardAPI` 卷 `fieldRef` 获得，但**不能作为环境变量**获得： <!-- `metadata.labels` : all of the pod's labels, formatted as `label-key="escaped-label-value"` with one label per line --> `metadata.labels` : Pod 的所有标签，格式为 `标签键名="转义后的标签值"`，每行一个标签 <!-- `metadata.annotations` : all of the pod's annotations, formatted as `annotation-key="escaped-annotation-value"` with one annotation per line --> `metadata.annotations` : Pod 的全部注解，格式为 `注解键名="转义后的注解值"`，每行一个注解 <!-- ### Information available via `resourceFieldRef` {#downwardapi-resourceFieldRef} These container-level fields allow you to provide information about [requests and limits](/docs/concepts/configuration/manage-resources-containers/#requests-and-limits) for resources such as CPU and memory. --> ### 可通过 `resourceFieldRef` 获得的信息  {#downwardapi-resourceFieldRef} <!-- `resource: limits.cpu` : A container's CPU limit --> `resource: limits.cpu` : 容器的 CPU 限制值 <!-- `resource: requests.cpu` : A container's CPU request --> `resource: requests.cpu` : 容器的 CPU 请求值 <!-- `resource: limits.memory` : A container's memory limit --> `resource: limits.memory` : 容器的内存限制值 <!-- `resource: requests.memory` : A container's memory request --> `resource: requests.memory` : 容器的内存请求值 <!-- `resource: limits.hugepages-*` : A container's hugepages limit (provided that the `DownwardAPIHugePages` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) is enabled) --> `resource: limits.hugepages-*` : 容器的巨页限制值（前提是启用了 `DownwardAPIHugePages` [特性门控](/zh-cn/docs/reference/command-line-tools-reference/feature-gates/)） <!-- `resource: requests.hugepages-*` : A container's hugepages request (provided that the `DownwardAPIHugePages` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) is enabled) --> `resource: requests.hugepages-*` : 容器的巨页请求值（前提是启用了 `DownwardAPIHugePages` [特性门控](/zh-cn/docs/reference/command-line-tools-reference/feature-gates/)） <!-- `resource: limits.ephemeral-storage` : A container's ephemeral-storage limit --> `resource: limits.ephemeral-storage` : 容器的临时存储的限制值 <!-- `resource: requests.ephemeral-storage` : A container's ephemeral-storage request --> `resource: requests.ephemeral-storage` : 容器的临时存储的请求值 <!-- #### Fallback information for resource limits If CPU and memory limits are not specified for a container, and you use the downward API to try to expose that information, then the kubelet defaults to exposing the maximum allocatable value for CPU and memory based on the [node allocatable](/docs/tasks/administer-cluster/reserve-compute-resources/#node-allocatable) calculation. --> #### 资源限制的后备信息  {#fallback-information-for-resource-limits} 如果没有为容器指定 CPU 和内存限制时尝试使用 Downward API 暴露该信息，那么 kubelet 默认会根据 [节点可分配资源](/zh-cn/docs/tasks/administer-cluster/reserve-compute-resources/#node-allocatable) 计算并暴露 CPU 和内存的最大可分配值。 ## {{% heading "whatsnext" %}} <!-- You can read about [`downwardAPI` volumes](/docs/concepts/storage/volumes/#downwardapi). You can try using the downward API to expose container- or Pod-level information: * as [environment variables](/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#the-downward-api) * as [files in `downwardAPI` volume](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) --> 你可以阅读有关 [`downwardAPI` 卷](/zh-cn/docs/concepts/storage/volumes/#downwardapi)的内容。 你可以尝试使用 Downward API 暴露容器或 Pod 级别的信息： * 作为[环境变量](/zh-cn/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#the-downward-api) * 作为 [`downwardAPI` 卷中的文件](/zh-cn/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) </ins>

Discussion:
The commit introduced a new page which is missing in the localization: Need help to translate it. /language zh /help
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/triage accepted
I want to translate this document. Can you assign it to me
/assign