新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch07/lab/README.md

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+# Ch07 lab
+
+Run the app:
+
+```
+kubectl apply -f lab/pi/
+```
+
+Check the app and see it's broken:
+
+```
+kubectl describe pod -l app=pi-web
+```
+
+> The startup command for the app container uses a script which doesn't exist.
+
+## Sample Solution
+
+My updated [Deployment](solution/web.yaml) for the web app uses multiple containers.
+
+Init containers:
+
+- init container `init-1` writes the startup script file in an EmptyDir volume
+- `init-2` makes the startup script executable
+- `init-3` writes a text file with a fake app version.
+
+App container:
+
+- mounts the EmptyDir volume and runs the script at startup; serves the app on port 80.
+
+Sidecar:
+
+- runs a simple NCat HTTP server, serving the version number text file on port 8080.
+
+
+Run the update and browse to your Service on port 8070 for Pi and 8071 for the version:
+
+```
+kubectl apply -f lab/solution/
+```
+
+> This is not the most efficient way to do this! It's just an example which makes use of multi-container Pods.
+
+
+## Teardown
+
+Delete the lab resources by their labels:
+
+```
+kubectl get all -l kiamol=ch07-lab
+
+kubectl delete all -l kiamol=ch07-lab
+```