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2 Initialize a Docker swarm

To use a docker swarm, first initialize one on the primary manager:

docker swarm init docker swarm init

Check that you have indeed initialized the swarm:

docker info docker info (swarm)

docker init --help
In case there are multiple IPs on your network interface, you will need to specify:
--advertise-addr, the address other nodes in the Docker swarm use to connect to your node, and
--listen-addr, the address that the swarm service listens on for incoming connections. docker swarm init --advertise-addr 192.168.2.23:2377 --listen-addr 192.168.2.23:2377

You should also make sure the nodes can reach one another, ie. not blocked by firewall.