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As far as I remember from trying last time a few years ago, Docker Swarm does not support rebalancing the load of containers and requires either manually issuing a command to do that or merely initially balances where containers are started. It this still true? And what about when you have state, which you would need to move between nodes, to make a container work elsewhere?

Swarm is great for small workloads (hosts =< 10). Networking is slow, but if you need something to just run containers over a set of hosts, you won't find anything simpler than that. Sadly Mirantis (company who now owns docker.inc) is intentionally neglecting it.

Does it support multiple nodes?

> Does it support multiple nodes?

Yes it does. Docker Swarm essentially provides an easy way to get a cluster of Docker instances running in multiple nodes that works right out of the box.

https://docs.docker.com/engine/swarm/