If you've worked with Docker containers, you already understand how powerful they can be. But did you know you can exponentially up the power of Docker by creating a cluster of Docker hosts, called a Docker swarm? Believe it or not, this process is really simple. All you need is one machine to serve as a Docker swarm manager and a few Docker hosts to join the swarm as nodes.
TechRepublic: Creating a Docker swarm can seriously empower your containers.