Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.
2018-05-05 18:00:51 +02:00
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+---
+reviewers:
+- mikedanese
+- thockin
+title: Container Environment Variables
+content_template: templates/concept
+---
+
+{{% capture overview %}}
+
+This page describes the resources available to Containers in the Container environment. 
+
+{{% /capture %}}
+
+{{< toc >}}
+
+{{% capture 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.
+
+### 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.
+
+### Cluster information
+
+A list of all services that were running when a Container was created is available to that Container as environment variables.
+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:
+
+```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. 
+
+{{% /capture %}}
+
+{{% capture 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/).
+
+{{% /capture %}}
+
+