Create a Docker swarm with one master node and a variable amount of slave nodes using a Consul discovery service.

docker-swarm.sh

###
# Create a swarm cluster
###
SWARM_NODES_COUNT=2

# Create a Consul discovery container on `default` Docker machine
docker run -d --name swarm-consul \
    --restart=always \
    -p "8500:8500" \
    -h "consul" \
    progrium/consul -server -bootstrap

# Create the swarm master
docker-machine create \
    -d virtualbox \
    --swarm --swarm-master \
    --swarm-discovery="consul://$(docker-machine ip default):8500" \
    --engine-opt="cluster-store=consul://$(docker-machine ip default):8500" \
    --engine-opt="cluster-advertise=eth1:2376" swarm-master

# Create the swarm nodes
for (( i=1; i<=$SWARM_NODES_COUNT; i++ )); do
    docker-machine create \
        -d virtualbox \
        --swarm \
        --swarm-discovery="consul://$(docker-machine ip default):8500" \
        --engine-opt="cluster-store=consul://$(docker-machine ip default):8500" \
        --engine-opt="cluster-advertise=eth1:2376" swarm-node0$i
done

# Connect to the swarm master
eval $(docker-machine env --swarm swarm-master)