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
+```

learn/learn-kubernetes-master/kiamol/ch07/lab/pi/web-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: pi-web
+  labels:
+    kiamol: ch07-lab
+spec:
+  ports:
+    - port: 8070    
+      targetPort: 80
+      name: http
+  selector:
+    app: pi-web
+  type: LoadBalancer

learn/learn-kubernetes-master/kiamol/ch07/lab/pi/web.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pi-web
+  labels:
+    kiamol: ch07-lab
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: pi-web
+  template:
+    metadata:
+      labels:
+        app: pi-web
+    spec:
+      containers:
+        - image: kiamol/ch05-pi
+          command: ["/scripts/startup.sh"]
+          name: web
+          ports:
+            - containerPort: 80
+              name: http

learn/learn-kubernetes-master/kiamol/ch07/lab/solution/web-version-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: pi-web-version
+  labels:
+    kiamol: ch07-lab
+spec:
+  ports:
+    - port: 8071
+      targetPort: 8080
+      name: http
+  selector:
+    app: pi-web
+  type: LoadBalancer

learn/learn-kubernetes-master/kiamol/ch07/lab/solution/web.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pi-web
+  labels:
+    kiamol: ch07-lab
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: pi-web
+  template:
+    metadata:
+      labels:
+        app: pi-web
+    spec:
+      initContainers:
+        - name: init-script-1
+          image: kiamol/ch03-sleep
+          command: ['sh', '-c', "echo '#!/bin/sh\ndotnet Pi.Web.dll -m web' > /init/startup.sh"]
+          volumeMounts:
+            - name: init
+              mountPath: "/init"
+        - name: init-script-2
+          image: kiamol/ch03-sleep
+          command: ['sh', '-c', "chmod +x /init/startup.sh"]
+          volumeMounts:
+            - name: init
+              mountPath: "/init"
+        - name: init-version
+          image: kiamol/ch03-sleep
+          command: ['sh', '-c', "echo 'ch07-lab' > /init/version.txt"]
+          volumeMounts:
+            - name: init
+              mountPath: "/init"
+      containers:
+        - name: web
+          image: kiamol/ch05-pi
+          command: ["/init/startup.sh"] 
+          ports:
+            - containerPort: 80
+              name: http
+          volumeMounts:
+            - name: init
+              mountPath: "/init"     
+        - name: server
+          image: kiamol/ch03-sleep  
+          command: ['sh', '-c', 'while true; do echo -e "HTTP/1.1 200 OK\nContent-Type: text/plain\nContent-Length: 9\n\n$(cat /init/version.txt)" | nc -l -p 8080; done']
+          ports:
+            - containerPort: 8080
+              name: http
+          volumeMounts:
+            - name: init
+              mountPath: "/init"
+      volumes:
+        - name: init
+          emptyDir: {}
+