Upgrading swarm mode cluster
<p>Docker changes so fast so I'm trying to find out if a Docker Swarm (swarm mode) cluster can be upgraded.  For instance say I am running 1.12 and I have a 3 node cluster running services.  Let's also say Docker 1.13 comes out and I want to upgrade the engines that make up the swarm cluster.  Is there anyway to do this that doesn't include recreating the cluster would prefer a almost a rolling engines update?</p>

<p>Thank you!</p>