At some point when managing a big environment, you might be intrested in having a Docker cluster.
Or like Docker calls it: a Docker swarm.
Creating one is quite well explained on the official Docker site:
https://docs.docker.com/engine/swarm/swarm-tutorial/create-swarm/
But in short:
first you need to initialize the swarm by the command below
docker swarm init --advertise-addr 10.81.70.199
To add workers, execute the command you get as feedback (as shown in the above screenshot) on your other servers.
On the manager server, type
docker node ls
to see your nodes successfully added to the swarm
To be able to create a cluster, you may want to install Docker on for example three Debian servers.
Click on this article to see how.