create a docker swarm service

create docker service that exposes port.

Create a docker swarm service 


 docker service create \
  --name=redis \
  --publish=6379:6379/tcp \
  --constraint=node.role!=manager \
  --mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
  arm32v7/redis:latest

docker service create
--name=mongo
--publish=27107:27107/tcp
--constraint=node.role!=manager
--mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock
nonoroazoro/rpi-mongo

note that with the publish command, the external port is the first argument

docker service create
--name=viz
--publish=8081:8080/tcp
--constraint=node.role==manager
--mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock
alexellis2/visualizer-arm:latest