title: Where is the docker swarm token stored?
body: <p>I've created a docker-machine swarm cluster using a new generated token, which was stored within an environment variable. The environment variable was only for valid for the current session, and is deleted afterward.
  Now I want to add a new docker-machine to the same cluster, but I can't find the needed token.</p>
  
  <p>How is it possible to find out the token used by an active docker swarm ?</p>