title: Rolling upgrades of a Playframework application
body: <p>Considering a PlayFramework application using Akka and WebSocket.</p>
  
  <p>For the moment, I have only one server. When I deploy a new version, I have to stop the server, deploy and restart. Not very customer friendly, isn't it…</p>
  
  <p>I wonder the easiest/cheapest way to perform a rolling upgrade ?</p>
  
  <p>Just having two separate instances of my application running and using a LB won't do the trick due to states owned by actors…</p>