Docker Swarm might be worth looking at regardless: (1) it's like 15 minutes to learn how it works and then maybe a morning or so playing around with it. Very l

Docker Swarm might be worth looking at regardless: (1) it's like 15 minutes to learn how it works and then maybe a morning or so playing around with it. Very low investment. (2) if you're already using docker-compose, it's pretty much an in-place switch. You might need to deal with a few restrictions (mandatory overlay network, no custom container names, no parameterized docker-compose), in exchange you'll get zero-downtime upgrades, automated rollbacks, and of course the ability to add more machines to your swarm.