Docker Engine includes the Swarm mode by default, so there is no additional installation process required. Since Docker Swarm is a native Docker clustering system, managing cluster nodes is done by the docker command and is therefore very simple and intuitive. Let's start by creating a manager node with two worker nodes. Then, we will run and scale a service from a Docker image.
Docker Swarm in practice
Setting up a Swarm
In order to set up a Swarm, we need to initialize the manager node. We can do this using the following command on a machine that is supposed to become the manager:
$ docker swarm init
Swarm initialized: current node (qfqzhk2bumhd2h0ckntrysm8l) is now a manager.
To add a worker to this swarm, run the following...
