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.

learn/learn-kubernetes-master/kiamol/ch05/lab/solution/proxy.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: todo-proxy-lab-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 100Mi
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: todo-proxy-lab
+  labels:
+    app: todo-proxy-lab
+spec:
+  selector:
+    matchLabels:
+      app: todo-proxy-lab
+  template:
+    metadata:
+      labels:
+        app: todo-proxy-lab
+    spec:
+      containers:
+        - image: nginx:1.17-alpine
+          name: nginx
+          ports:
+            - containerPort: 80
+              name: http
+          volumeMounts:
+            - name: config
+              mountPath: "/etc/nginx/"
+              readOnly: true
+            - name: cache-volume
+              mountPath: /data/nginx/cache
+      volumes:
+        - name: config
+          configMap:
+            name: todo-proxy-lab-configmap
+        - name: cache-volume
+          persistentVolumeClaim:
+            claimName: todo-proxy-lab-pvc

learn/learn-kubernetes-master/kiamol/ch05/lab/solution/web.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: todo-web-lab-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 200Mi
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: todo-web-lab
+spec:
+  selector:
+    matchLabels:
+      app: todo-web-lab
+  template:
+    metadata:
+      labels:
+        app: todo-web-lab
+    spec:
+      containers:
+        - name: web
+          image: kiamol/ch04-todo-list
+          env:
+          - name: Database__Provider
+            value: Sqlite
+          - name: ConnectionStrings__ToDoDb
+            value: "Filename=/data/todo-list-lab.db"
+          volumeMounts:
+            - name: data
+              mountPath: /data
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: todo-web-lab-pvc

learn/learn-kubernetes-master/kiamol/ch05/lab/todo-list/proxy.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: todo-proxy-lab
+  labels:
+    app: todo-proxy-lab
+spec:
+  ports:
+    - port: 8082
+      targetPort: 80
+  selector:
+    app: todo-proxy-lab
+  type: LoadBalancer
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: todo-proxy-lab-configmap
+data:
+  nginx.conf: |-
+    user  nginx;
+    worker_processes  1;
+
+    error_log  /var/log/nginx/error.log warn;
+    pid        /var/run/nginx.pid;
+
+    events {
+      worker_connections  1024;
+    }
+
+    http {
+      proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=STATIC:10m inactive=24h  max_size=1g;
+
+      server {
+        listen 80 default_server;
+        listen [::]:80 default_server;
+
+        location / {
+            proxy_pass             http://todo-web-lab;
+            proxy_set_header       Host $host;
+            proxy_cache            STATIC;
+            proxy_cache_valid      200  1d;
+            add_header             X-Cache     $upstream_cache_status;
+            add_header             X-Host      $hostname;         
+        }
+      }
+    }
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: todo-proxy-lab
+  labels:
+    app: todo-proxy-lab
+spec:
+  selector:
+    matchLabels:
+      app: todo-proxy-lab
+  template:
+    metadata:
+      labels:
+        app: todo-proxy-lab
+    spec:
+      containers:
+        - image: nginx:1.17-alpine
+          name: nginx
+          ports:
+            - containerPort: 80
+              name: http
+          volumeMounts:
+            - name: config
+              mountPath: "/etc/nginx/"
+              readOnly: true
+      volumes:
+        - name: config
+          configMap:
+            name: todo-proxy-lab-configmap

learn/learn-kubernetes-master/kiamol/ch05/lab/todo-list/web.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: todo-web-lab
+spec:
+  ports:
+    - port: 80
+      targetPort: 80
+  selector:
+    app: todo-web-lab
+  type: ClusterIP
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: todo-web-lab
+spec:
+  selector:
+    matchLabels:
+      app: todo-web-lab
+  template:
+    metadata:
+      labels:
+        app: todo-web-lab
+    spec:
+      containers:
+        - name: web
+          image: kiamol/ch04-todo-list
+          env:
+          - name: Database__Provider
+            value: Sqlite
+          - name: ConnectionStrings__ToDoDb
+            value: "Filename=/data/todo-list-lab.db"