Docker in Docker (dind) swarm creation script

	#!/bin/bash
	# set -x
	MANAGER=${1:-3}
	WORKER=${2:-0}
	#=========================
	# Creating cluster members
	#=========================
	echo "### Creating $MANAGER managers"
	for i in $(seq 2 "$MANAGER"); do
	docker run -d --privileged --name master-"${i}" --hostname=master-"${i}" -p "${i}"2375:2375 docker:stable-dind
	done
	echo "### Creating $WORKER workers"
	for i in $(seq 1 "$WORKER"); do
	docker run -d --privileged --name worker-"${i}" --hostname=worker-"${i}" -p "${i}"3375:2375 docker:stable-dind
	done
	#===============
	# Starting swarm
	#===============
	MANAGER_IP="172.17.0.1"
	echo "### Initializing main master: localhost"
	docker swarm init --advertise-addr "$MANAGER_IP"
	#===============
	# Adding members
	#===============
	MANAGER_TOKEN=$(docker swarm join-token -q manager)
	WORKER_TOKEN=$(docker swarm join-token -q worker)
	for i in $(seq 2 "$MANAGER"); do
	echo "### Joining manager: swarm-manager$i"
	docker --host=localhost:"${i}"2375 swarm join --token "${MANAGER_TOKEN}" "${MANAGER_IP}":2377
	done
	for i in $(seq 1 "$WORKER"); do
	echo "### Joining worker: swarm-manager$i"
	docker --host=localhost:"${i}"3375 swarm join --token "${WORKER_TOKEN}" "${MANAGER_IP}":2377
	done
	docker node ls