Docker Swarm | Docker Tutorial | What is a docker swarm

Docker Swarm | Docker Tutorial | What is a docker swarm?
A swarm consists of multiple Docker hosts which run in swarm mode and act as managers and workers.
A given Docker host can be a manager, a worker, or perform both roles.
When you create a service, you define number of replicas, network and storage resources available to it, ports the service exposes to the outside world, and more.
Docker works to maintain that desired state.
For instance, if a worker node becomes unavailable, Docker schedules that node’s tasks on other nodes.
A task is a running container which is part of a swarm service and managed by a swarm manager, as opposed to a standalone container.
You can modify a service’s configuration, including the networks and volumes it is connected to, without the need to manually restart the service.
Docker will update the configuration, stop the service tasks with the out of date configuration, and create new ones matching the desired configuration.
When Docker is running in swarm mode, you can still run standalone containers on any of the Docker hosts participating in the swarm, as well as swarm services.

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[AdrianoLeal]

Excellent video.
I'm starting at Swarm, oddly enough. Is there a way to implement it in an environment that has three servers running Docker instances, with different containers each, working?