Refactor swarm/core.yml to add shepherd service for managing containers

scripts/create-swarm.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -x
+
+# since we created droplets with a private NIC on eth1, lets use that for swarm comms
+LEADER_IP=$(docker-machine ssh dvc1 ifconfig eth1 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}')
+
+# create a swarm as all managers
+docker-machine ssh dvc1 docker swarm init --advertise-addr "$LEADER_IP"
+
+# note that if you use eth1 above (private network in digitalocean) it makes the below
+# a bit tricky, because docker-machine lists the public IP's but we need the 
+# private IP of manager for join commands, so we can't simply envvar the token
+# like lots of scripts do... we'd need to fist get private IP of first node
+
+# TODO: provide flexable numbers at cli for x managers and x workers
+JOIN_TOKEN=$(docker-machine ssh dvc1 docker swarm join-token -q manager)
+
+for i in 2 3; do
+  docker-machine ssh dvc$i docker swarm join --token "$JOIN_TOKEN" "$LEADER_IP":2377
+done
+
+docker-machine env dvc1