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

learn/learn-kubernetes-master/kiamol/ch08/lab/README.md

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+# Ch08 lab
+
+Run the app:
+
+```
+kubectl apply -f lab/nginx/
+```
+
+Get the URL and browse:
+
+```
+kubectl get svc nginx -o jsonpath='http://{.status.loadBalancer.ingress[0].*}:8088'
+```
+
+> It works, but its just a single Pod writing logs to an EmptyDir.
+
+## Sample Solution
+
+My [StatefulSet](solution/nginx-statefulset.yaml) runs three Pods, with volume claim templates for storage.
+
+```
+kubectl apply -f lab/solution/nginx-statefulset.yaml
+```
+
+> Make lots of calls to the web app
+
+I used this in Powershell:
+
+```
+for($i = 0; $i -lt 100; $i++) { curl http://localhost:8088 | Out-Null }
+```
+
+Then the [Job](solution/disk-calc-job.yaml) is configured to mount all of the PVCs used in the StatefulSet Pods.
+
+```
+kubectl apply -f lab/solution/disk-calc-job.yaml
+```
+
+When I check the logs I see this:
+
+```
+PS>kubectl logs -l job-name=disk-calc
+32.0K   /nginx0/access.log
+24.0K   /nginx1/access.log
+40.0K   /nginx2/access.log
+```
+
+## Teardown
+
+Delete the lab resources by their labels:
+
+```
+kubectl delete all -l kiamol=ch08-lab
+
+kubectl delete pvc -l kiamol=ch08-lab
+```

learn/learn-kubernetes-master/kiamol/ch08/lab/disk-calc-job.yaml

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+apiVersion: v1
+kind: Job
+metadata:
+  name: nginx
+  labels:
+    kiamol: ch08-lab
+    app: nginx
+spec:
+  containers:
+    - image: kiamol/ch03-sleep
+      name: calc
+      command: ['sh', '-c', 'du -h /nginx1/access.log /nginx2/access.log /nginx3/access.log']
+      ports:
+        - containerPort: 80
+      volumeMounts:
+        - name: nginx1
+          mountPath: /nginx1/
+        - name: nginx2
+          mountPath: /nginx2/
+        - name: nginx3
+          mountPath: /nginx3/
+  # volumes:
+  # ?

learn/learn-kubernetes-master/kiamol/ch08/lab/nginx/nginx-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+  labels:
+    kiamol: ch08-lab
+spec:
+  type: LoadBalancer
+  ports:
+    - port: 8088
+      targetPort: 80
+  selector:
+    app: nginx

learn/learn-kubernetes-master/kiamol/ch08/lab/nginx/nginx.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+  labels:
+    kiamol: ch08-lab
+    app: nginx
+spec:
+  containers:
+    - image: nginx:1.17-alpine
+      name: nginx
+      ports:
+        - containerPort: 80
+      volumeMounts:
+        - name: logs
+          mountPath: /var/log/nginx/
+  volumes:
+    - name: logs
+      emptyDir: {}

learn/learn-kubernetes-master/kiamol/ch08/lab/solution/disk-calc-job.yaml

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+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: disk-calc
+  labels:
+    kiamol: ch08-lab
+spec:
+  template:
+    spec:
+      restartPolicy: Never
+      containers:
+        - image: kiamol/ch03-sleep
+          name: calc
+          command: ['sh', '-c', 'du -h /nginx0/access.log /nginx1/access.log /nginx2/access.log']
+          ports:
+            - containerPort: 80
+          volumeMounts:
+            - name: nginx0
+              mountPath: /nginx0/
+            - name: nginx1
+              mountPath: /nginx1/
+            - name: nginx2
+              mountPath: /nginx2/
+      volumes:
+        - name: nginx0
+          persistentVolumeClaim:
+            claimName: logs-nginx-stateful-0
+        - name: nginx1
+          persistentVolumeClaim:
+            claimName: logs-nginx-stateful-1
+        - name: nginx2
+          persistentVolumeClaim:
+            claimName: logs-nginx-stateful-2

learn/learn-kubernetes-master/kiamol/ch08/lab/solution/nginx-statefulset.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+  labels:
+    kiamol: ch08-lab
+spec:
+  type: LoadBalancer
+  ports:
+  - port: 8088
+    targetPort: 80
+  selector:
+    app: nginx-stateful
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: nginx-stateful
+  labels:
+    kiamol: ch08-lab
+spec:
+  selector:
+    matchLabels:
+      app: nginx-stateful
+  serviceName: nginx-stateful
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: nginx-stateful
+    spec:
+      containers:
+        - image: nginx:1.17-alpine
+          name: nginx
+          ports:
+            - containerPort: 80
+          volumeMounts:
+            - name: logs
+              mountPath: /var/log/nginx/
+  volumeClaimTemplates:
+  - metadata:
+      name: logs
+      labels:
+        kiamol: ch08-lab
+    spec:
+      accessModes: 
+       - ReadWriteOnce
+      resources:
+        requests:
+          storage: 10Mi