configmap解决subPath目录覆盖的问题

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: demo-nginx
  name: demo-nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: demo-nginx
  template:
    metadata:
      labels:
        app: demo-nginx
    spec:
      containers:
        image: nginx
        imagePullPolicy: IfNotPresent
        name: nginx
        ports:
        - containerPort: 80
          name: web
          protocol: TCP
        volumeMounts:
        - mountPath: /etc/nginx/nginx.conf
          name: config-volume
          subPath: etc/nginx/nginx.conf
      volumes:
      - name: config-volume
        configMap:
          name: nginx-conf
          defaultMode: 420
          items:
          - key: nginx.conf
            path: etc/nginx/nginx.conf