title: can I mount a file from volume in docker to the container?
body: <p>I put one security file like <code>id_rsa</code> in the docker volume <code>larrycai_vol</code>, trying to mount this into the container as a file. </p>
  
  <pre><code>$ docker volume inspect larrycai-vol
  [
      {
          "CreatedAt": "2018-05-18T06:02:24Z",
          "Driver": "local",
          "Labels": {},
          "Mountpoint": "/var/lib/docker/volumes/larrycai-vol/_data",
          "Name": "larrycai-vol",
          "Options": {},
          "Scope": "local"
      }
  ]
  </code></pre>
  
  <p>Do we have some command like below (it doesn't work now)</p>
  
  <pre><code>docker run -it -v larrycai-vol/id_rsa:/root/.ssh/id_rsa own_ubuntu
  </code></pre>
  
  <p>I know it works if I mount file from docker host</p>
  
  <pre><code>docker run -it -v $PWD/.ssh/id_rsa:/root/.ssh/id_rsa own_ubuntu
  </code></pre>