2020-04-28 12:20:24 +00:00
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---
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title: 容器环境
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2020-06-01 13:23:39 +00:00
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content_type: concept
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2020-04-28 12:20:24 +00:00
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weight: 20
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---
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2020-06-01 13:23:39 +00:00
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<!-- overview -->
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2020-04-28 12:20:24 +00:00
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<!--
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This page describes the resources available to Containers in the Container environment.
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-->
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本页描述了在容器环境里容器可用的资源。
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2020-06-01 13:23:39 +00:00
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<!-- body -->
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2020-04-28 12:20:24 +00:00
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<!--
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## Container environment
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The Kubernetes Container environment provides several important resources to Containers:
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* A filesystem, which is a combination of an [image](/docs/concepts/containers/images/) and one or more [volumes](/docs/concepts/storage/volumes/).
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* Information about the Container itself.
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* Information about other objects in the cluster.
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-->
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## 容器环境
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Kubernetes 的容器环境给容器提供了几个重要的资源：
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* 文件系统，其中包含一个[镜像](/docs/concepts/containers/images/) 和一个或多个的[卷](/docs/concepts/storage/volumes/)。
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* 容器自身的信息。
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* 集群中其他对象的信息。
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<!--
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### Container information
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The *hostname* of a Container is the name of the Pod in which the Container is running.
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It is available through the `hostname` command or the
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[`gethostname`](http://man7.org/linux/man-pages/man2/gethostname.2.html)
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function call in libc.
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The Pod name and namespace are available as environment variables through the
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[downward API](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/).
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User defined environment variables from the Pod definition are also available to the Container,
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as are any environment variables specified statically in the Docker image.
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-->
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### 容器信息
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容器的 *hostname* 是它所运行在的 pod 的名称。它可以通过 `hostname` 命令或者调用 libc 中的 [`gethostname`](http://man7.org/linux/man-pages/man2/gethostname.2.html) 函数来获取。
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Pod 名称和命名空间可以通过 [downward API](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) 使用环境变量。
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Pod 定义中的用户所定义的环境变量也可在容器中使用，就像在 Docker 镜像中静态指定的任何环境变量一样。
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<!--
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### Cluster information
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A list of all services that were running when a Container was created is available to that Container as environment variables.
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Those environment variables match the syntax of Docker links.
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For a service named *foo* that maps to a Container named *bar*,
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the following variables are defined:
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-->
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### 集群信息
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创建容器时正在运行的所有服务的列表都可用作该容器的环境变量。这些环境变量与 Docker 链接的语法匹配。
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对于名为 *foo* 的服务，当映射到名为 *bar* 的容器时，以下变量是被定义了的：
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```shell
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FOO_SERVICE_HOST=<the host the service is running on>
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FOO_SERVICE_PORT=<the port the service is running on>
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```
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<!--
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Services have dedicated IP addresses and are available to the Container via DNS,
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if [DNS addon](http://releases.k8s.io/{{< param "githubbranch" >}}/cluster/addons/dns/) is enabled.
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-->
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Service 具有专用的 IP 地址。如果启用了 [DNS插件](http://releases.k8s.io/{{< param "githubbranch" >}}/cluster/addons/dns/)，就可以在容器中通过 DNS 来访问。
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2020-06-01 13:23:39 +00:00
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## {{% heading "whatsnext" %}}
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2020-04-28 12:20:24 +00:00
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<!--
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* Learn more about [Container lifecycle hooks](/docs/concepts/containers/container-lifecycle-hooks/).
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* Get hands-on experience
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[attaching handlers to Container lifecycle events](/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/).
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-->
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* 学习更多有关[容器生命周期钩子](/docs/concepts/containers/container-lifecycle-hooks/)的知识。
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* 动手获得经验[将处理程序附加到容器生命周期事件](/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/)。
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2020-06-01 13:23:39 +00:00
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