109 lines
4.0 KiB
Markdown
109 lines
4.0 KiB
Markdown
---
|
||
title: 容器环境
|
||
content_type: concept
|
||
weight: 20
|
||
---
|
||
<!--
|
||
reviewers:
|
||
- mikedanese
|
||
- thockin
|
||
title: Container Environment
|
||
content_type: concept
|
||
weight: 20
|
||
-->
|
||
|
||
<!-- overview -->
|
||
|
||
<!--
|
||
This page describes the resources available to Containers in the Container environment.
|
||
-->
|
||
本页描述了在容器环境里容器可用的资源。
|
||
|
||
<!-- body -->
|
||
|
||
<!--
|
||
## Container environment
|
||
|
||
The Kubernetes Container environment provides several important resources to Containers:
|
||
|
||
* A filesystem, which is a combination of an [image](/docs/concepts/containers/images/) and one or more [volumes](/docs/concepts/storage/volumes/).
|
||
* Information about the Container itself.
|
||
* Information about other objects in the cluster.
|
||
-->
|
||
## 容器环境 {#container-environment}
|
||
|
||
Kubernetes 的容器环境给容器提供了几个重要的资源：
|
||
|
||
* 文件系统，其中包含一个[镜像](/zh/docs/concepts/containers/images/)
|
||
和一个或多个的[卷](/zh/docs/concepts/storage/volumes/)
|
||
* 容器自身的信息
|
||
* 集群中其他对象的信息
|
||
|
||
<!--
|
||
### Container information
|
||
|
||
The *hostname* of a Container is the name of the Pod in which the Container is running.
|
||
It is available through the `hostname` command or the
|
||
[`gethostname`](http://man7.org/linux/man-pages/man2/gethostname.2.html)
|
||
function call in libc.
|
||
|
||
The Pod name and namespace are available as environment variables through the
|
||
[downward API](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/).
|
||
|
||
User defined environment variables from the Pod definition are also available to the Container,
|
||
as are any environment variables specified statically in the Docker image.
|
||
-->
|
||
### 容器信息
|
||
|
||
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`](https://man7.org/linux/man-pages/man2/gethostname.2.html) 函数来获取。
|
||
|
||
Pod 名称和命名空间可以通过
|
||
[下行 API](/zh/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/)
|
||
转换为环境变量。
|
||
|
||
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。
|
||
|
||
<!--
|
||
### Cluster information
|
||
|
||
A list of all services that were running when a Container was created is available to that Container as environment variables.
|
||
This list is limited to services within the same namespace as the new Container's Pod and Kubernetes control plane services.
|
||
Those environment variables match the syntax of Docker links.
|
||
|
||
For a service named *foo* that maps to a Container named *bar*,
|
||
the following variables are defined:
|
||
-->
|
||
### 集群信息
|
||
|
||
创建容器时正在运行的所有服务都可用作该容器的环境变量。
|
||
这里的服务仅限于新容器的 Pod 所在的名字空间中的服务，以及 Kubernetes 控制面的服务。
|
||
这些环境变量与 Docker 链接的语法相同。
|
||
|
||
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：
|
||
|
||
```shell
|
||
FOO_SERVICE_HOST=<the host the service is running on>
|
||
FOO_SERVICE_PORT=<the port the service is running on>
|
||
```
|
||
|
||
<!--
|
||
Services have dedicated IP addresses and are available to the Container via DNS,
|
||
if [DNS addon](http://releases.k8s.io/{{< param "githubbranch" >}}/cluster/addons/dns/) is enabled.
|
||
-->
|
||
服务具有专用的 IP 地址。如果启用了
|
||
[DNS插件](https://releases.k8s.io/{{< param "githubbranch" >}}/cluster/addons/dns/)，
|
||
可以在容器中通过 DNS 来访问服务。
|
||
|
||
## {{% heading "whatsnext" %}}
|
||
|
||
<!--
|
||
* Learn more about [Container lifecycle hooks](/docs/concepts/containers/container-lifecycle-hooks/).
|
||
* Get hands-on experience
|
||
[attaching handlers to Container lifecycle events](/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/).
|
||
-->
|
||
* 学习更多有关[容器生命周期回调](/zh/docs/concepts/containers/container-lifecycle-hooks/)的知识
|
||
* 动手[为容器生命周期事件添加处理程序](/zh/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/)
|
||
|
||
|