astefanutti commented on issue #554: resources: add options to configure mount 
path and key
URL: https://github.com/apache/camel-k/pull/554#issuecomment-472607296
 
 
   if `subPath` is empty, it defaults to `\`, that the corresponding volume 
root directory gets mounted, which for a config map is all the keys (c.f. 
kubernetes/kubernetes#22575). In that case `mountPath` must be a directory.
   
   An alternative would be to use the `path` field to specify the file path for 
a specific ConfigMap item, e.g.:
   
   ```
   resources:
     - configMap:
         name: nexus3
         items:
           - key: nexus3-persistent-template.yaml
             path: keys
         mountPath: /etc/camel/resources/n3/
       type: data
   ```
   
   See: 
https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#add-configmap-data-to-a-specific-path-in-the-volume.
   
   But the added value of `subPath` is that you can project a config map key 
into an existing directory without overriding the whole directory.
   
   We could also reuse the `configMapRef` field name as in 
`k8s.io/api/core/v1`, e.g.:
   
   ```
   resources:
     - configMapRef:
         name: nexus3
       subPath: nexus3-persistent-template.yaml
       mountPath: /etc/camel/resources/n3/nexus.yaml
       type: data
   ```
   
   

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