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

learn/learn-kubernetes-master/kiamol/ch05/lab/README.md

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+# Ch05 lab
+
+Run the app:
+
+```
+kubectl apply -f lab/todo-list
+```
+
+Check the pods - the proxy fails. Logs tell you why:
+
+```
+kubectl get pods
+
+kubectl logs -l app=todo-proxy-lab
+```
+
+The proxy pod needs the cache directory to exist before it starts. So there are two volumes to provide:
+
+- in the proxy a volume to mount to `/data/nginx/cache` (from the logs)
+- in the web app a mount to `/data` (from the env settings in the pod spec).
+
+## Sample solution
+
+I'm using PVCs with no storage class defined, so they will use the default provisioner. These YAML files contain the PVC spec and updated deployment specs:
+
+- [proxy.yaml](solution/proxy.yaml)
+- [web.yaml](solution/web.yaml)
+
+Deploy the updates and check volumes:
+
+```
+kubectl apply -f lab/solution/
+
+kubectl get pvc
+
+kubectl get pv
+```
+
+Find the URL for the proxy:
+
+```
+kubectl get svc todo-proxy-lab -o jsonpath='http://{.status.loadBalancer.ingress[0].*}:8082'
+```
+
+Browse, add some items, delete the pods:
+
+```
+kubectl delete pod -l app=todo-proxy-lab
+
+kubectl delete pod -l app=todo-web-lab
+```
+
+Refresh your browser, and you should see your original data.