Convert site to Hugo (#8316)

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content/en/docs/tasks/debug-application-cluster/get-shell-running-container.md

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+---
+reviewers:
+- caesarxuchao
+- mikedanese
+title: Get a Shell to a Running Container
+content_template: templates/task
+---
+
+{{% capture overview %}}
+
+This page shows how to use `kubectl exec` to get a shell to a
+running Container.
+
+{{% /capture %}}
+
+
+{{% capture prerequisites %}}
+
+{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+
+{{% /capture %}}
+
+
+{{% capture steps %}}
+
+## Getting a shell to a Container
+
+In this exercise, you create a Pod that has one Container. The Container
+runs the nginx image. Here is the configuration file for the Pod:
+
+{{< code file="shell-demo.yaml" >}}
+
+Create the Pod:
+
+```shell
+kubectl create -f https://k8s.io/docs/tasks/debug-application-cluster/shell-demo.yaml
+```
+
+Verify that the Container is running:
+
+```shell
+kubectl get pod shell-demo
+```
+
+Get a shell to the running Container:
+
+```shell
+kubectl exec -it shell-demo -- /bin/bash
+```
+
+In your shell, list the root directory:
+
+```shell
+root@shell-demo:/# ls /
+```
+
+In your shell, experiment with other commands. Here are
+some examples:
+
+```shell
+root@shell-demo:/# ls /
+root@shell-demo:/# cat /proc/mounts
+root@shell-demo:/# cat /proc/1/maps
+root@shell-demo:/# apt-get update
+root@shell-demo:/# apt-get install -y tcpdump
+root@shell-demo:/# tcpdump
+root@shell-demo:/# apt-get install -y lsof
+root@shell-demo:/# lsof
+root@shell-demo:/# apt-get install -y procps
+root@shell-demo:/# ps aux
+root@shell-demo:/# ps aux | grep nginx
+```
+
+## Writing the root page for nginx
+
+Look again at the configuration file for your Pod. The Pod
+has an `emptyDir` volume, and the Container mounts the volume
+at `/usr/share/nginx/html`.
+
+In your shell, create an `index.html` file in the `/usr/share/nginx/html`
+directory:
+
+```shell
+root@shell-demo:/# echo Hello shell demo > /usr/share/nginx/html/index.html
+```
+
+In your shell, send a GET request to the nginx server:
+
+```shell
+root@shell-demo:/# apt-get update
+root@shell-demo:/# apt-get install curl
+root@shell-demo:/# curl localhost
+```
+
+The output shows the text that you wrote to the `index.html` file:
+
+```shell
+Hello shell demo
+```
+
+When you are finished with your shell, enter `exit`.
+
+## Running individual commands in a Container
+
+In an ordinary command window, not your shell, list the environment
+variables in the running Container:
+
+```shell
+kubectl exec shell-demo env
+```
+
+Experiment running other commands. Here are some examples:
+
+```shell
+kubectl exec shell-demo ps aux
+kubectl exec shell-demo ls /
+kubectl exec shell-demo cat /proc/1/mounts
+```
+
+{{% /capture %}}
+
+{{% capture discussion %}}
+
+## Opening a shell when a Pod has more than one Container
+
+If a Pod has more than one Container, use `--container` or `-c` to
+specify a Container in the `kubectl exec` command. For example,
+suppose you have a Pod named my-pod, and the Pod has two containers
+named main-app and helper-app. The following command would open a
+shell to the main-app Container.
+
+```shell
+kubectl exec -it my-pod --container main-app -- /bin/bash
+```
+
+{{% /capture %}}
+
+
+{{% capture whatsnext %}}
+
+* [kubectl exec](/docs/reference/generated/kubectl/kubectl-commands/#exec)
+
+{{% /capture %}}
+
+
+