Add basic info

practice/4.saving-data/3.pvc/README.md

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+# PV/PVC
+
+1) Применяем манифест pvc.yml
+
+```bash
+kubectl apply -f ~/slurm/practice/4.saving-data/3.pvc/pvc.yaml
+
+kubectl get pvc
+kubectl get pv
+```
+
+2) Запустим приложение, использующее PV
+
+```bash
+kubectl apply -f ~/slurm/practice/4.saving-data/3.pvc/
+```
+
+3) Посмотрим describe и смонтированные тома в контейнере
+
+```bash
+kubectl describe pod fileshare-<TAB>
+kubectl exec -it fileshare-<TAB> -- df -h
+```
+
+4) Очищаем
+
+```bash
+kubectl delete -f ~/slurm/practice/4.saving-data/3.pvc/
+```

practice/4.saving-data/3.pvc/configmap.yaml

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+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: fileshare
+data:
+  default.conf: |
+    server {
+      listen       80 default_server;
+      server_name  _;
+
+      default_type text/plain;
+
+      location / {
+        return 200 '$hostname\n';
+      }
+
+      location /files {
+        alias /data;
+        autoindex on;
+        client_body_temp_path /tmp;
+        dav_methods PUT DELETE MKCOL COPY MOVE;
+        create_full_put_path on;
+        dav_access user:rw group:rw all:r;
+      }
+    }

practice/4.saving-data/3.pvc/deployment.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: fileshare
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: fileshare
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: fileshare
+    spec:
+      initContainers:
+      - image: busybox
+        name: mount-permissions-fix
+        command: ["sh", "-c", "chmod 777 /data"]
+        volumeMounts:
+        - name: data
+          mountPath: /data
+      containers:
+      - image: centosadmin/reloadable-nginx:1.12
+        name: nginx
+        ports:
+        - containerPort: 80
+        resources:
+          requests:
+            cpu: 50m
+            memory: 100Mi
+          limits:
+            cpu: 100m
+            memory: 100Mi
+        volumeMounts:
+        - name: config
+          mountPath: /etc/nginx/conf.d
+        - name: data
+          mountPath: /data
+      volumes:
+      - name: config
+        configMap:
+          name: fileshare
+      - name: data
+        persistentVolumeClaim:
+          claimName: fileshare

practice/4.saving-data/3.pvc/pvc.yaml

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+---
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: fileshare
+spec:
+  accessModes:
+  - ReadWriteMany
+  resources:
+    requests:
+      storage: 1Gi