I used a configMap to store the mount path value, but when i call in my pod it doesn't work it seems that the mountPath property can not be assigned to an env variable.

here is my code :

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80
        env:
        - name: MOUNT_PATH
          valueFrom:
           configMapKeyRef:
            name: my-configMap
            key: MOUNT_PATH
        volumeMounts:
        - name: nginx-volume
          mountPath: $(MOUNT_PATH)
      volumes:
      - name: nginx-volume
        persistentVolumeClaim:
         claimName: my-pvc

     ---


apiVersion: v1
kind: ConfigMap
metadata:
  name: my-configMap
  namespace: default
data:
  MOUNT_PATH: "/opt/somepath"