route to docker-machine container network (from mac)

gistfile1.txt

#!/bin/bash
# Script to instruct the Mac how to route packets to the
# software defined network where containers created via docker machine
# reside.  This lets you casually directly to ports (ssh, http, etc. etc.)
# on those containers.
if [ -z "$1" ]; then
  echo "Please supply the name of the docker-machine VM${NC}"
  exit 1
fi

MACHINE_NAME=$1
function ERROR(){ echo "ERROR: $*" ; }
function FAIL(){ echo "FAILING: $*" ; exit 1; }
if [[ 'Running' != $(docker-machine status $MACHINE_NAME) ]]
then FAIL "docker-machine's  $MACHINE_NAME VM not running" ; fi
IP_OF_DOCKER_HOST=$(docker-machine ip $MACHINE_NAME 2> /dev/null)
SDN_NET_FOR_CONTAINERS=$(docker-machine ssh $MACHINE_NAME ip route show 2> /dev/null | awk '/docker0/{print $1}' )
echo "Establishing route to $SDN_NET_FOR_CONTAINERS via $IP_OF_DOCKER_HOST"
if netstat -rn | awk "\$2 == \"$IP_OF_DOCKER_HOST\" {exit(1);}" ; then
	    sudo route -n add "$SDN_NET_FOR_CONTAINERS" "$IP_OF_DOCKER_HOST"
    else
	        ERROR "Already routing something to the docker VM ..."
		    netstat -rn \
			            | awk '$2 == "192.168.59.103"||/Destination.*Refs/{print;}'
		        FAIL "... so never mind."
		fi