title: Link a file throught docker
body: <p>I try to link a file throught a docker service.
  I have 1 service (traefik) looking for some file in a directory.
  I have another service: &quot;whoami&quot; with a conf file next to it.
  I want to link the conf file in a specific shared volume throught docker, so i did that:</p>
  <pre class="lang-yaml prettyprint-override"><code>  whoami:
      image: &quot;containous/whoami&quot;
      networks:
        - traefik
      volumes:
        - &quot;./whoami.yml:/etc/traefik/conf/whoami.yml&quot;
        - &quot;./conf:/etc/traefik/conf&quot;
  </code></pre>
  <p>The file appear in ./conf but is empty.</p>
  <p>Someone have an idea on how to do this ?
  I do not want to copy/paste some file each time I start/stop a service.</p>