As we did for our simple web server, we will begin by creating another Swarm cluster:
$ docker swarm initSwarm initialized: current node (1y1h7rgpxbsfqryvrxa04rvcp) is now a manager.To add a worker to this swarm, run the following command: docker swarm join \ --token SWMTKN-1-36flmf9vnika6x5mbxx7vf9kldqaw6bq8lxtkeyaj4r5s461ln-aiqlw49iufv3s6po4z2fytos1 \ 192.168.4.128:2377
Then, we need to create our overlay network for the service-discovery hostname resolution to work. You don't need to know much about this other than it creates an isolated network that we will add all the services to:
$ docker network create --driver overlay service_network44cyg4vsitbx81p208vslp0rx
Finally, we will build and launch our containers:
$ cd ../database ...
