title: ConfigMap being mounted as a folder instead of file
body: <p>I have a problem mounting 2 files in a pod, one is being treated as a directory for some reason (maybe stupid one, but I looked and looked, couldn't find a solution).</p>
  <p>in my <code>config</code> folder there's 2 files:</p>
  <pre><code>config
  |- log4j.properties
  |- server.main.properties
  </code></pre>
  <p>Running <code>StatefulSet</code>, here's the Volumes part of the manifest file:</p>
  <pre><code>containers:
   ...
        volumeMounts:
          - mountPath: /usr/local/confluent/config/log4j.properties
            name: log4j-properties
            subPath: log4j.properties
          - mountPath: /usr/local/confluent/config/server.properties
            name: server-properties
            subPath: server.properties
    restartPolicy: Always
    volumes:
      - name: log4j-properties
        configMap:
          name: log4j-properties
          defaultMode: 0777
      - name: server-properties
        configMap:
          name: server-properties
          defaultMode: 0777
  volumeClaimTemplates:
  - metadata:
      name: confluent-persistent-storage
    spec:
      accessModes:
        - ReadWriteOnce
      resources:
        requests:
          storage: 1Gi
  </code></pre>
  <p>Created ConfigMaps:</p>
  <pre><code>kubectl create configmap server-properties --from-file=config/server.main.properties
  kubectl create configmap log4j-properties --from-file=config/log4j.properties
  </code></pre>
  <p><code>kubectl describe pod</code> gives mounted volumes as:</p>
  <pre><code>    Volumes:
    confluent-persistent-storage:
      Type:       PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
      ClaimName:  confluent-persistent-storage-confluent-0
      ReadOnly:   false
    server-properties:
      Type:      ConfigMap (a volume populated by a ConfigMap)
      Name:      server-properties
      Optional:  false
    log4j-properties:
      Type:      ConfigMap (a volume populated by a ConfigMap)
      Name:      log4j-properties
      Optional:  false
  </code></pre>
  <p>It's being initialized for 5-6 minutes and in logs I can see that server.properties is not a file, but a folder, and when I exec into pod, I can see that the actual folder is been created instead of file.. What am I doing wrong here?</p>