useDockerMachine.sh

# Call with a machine name to load the environment for that machine. Called
# without a machine name it will load a ~/.docker_env file into the shell
# environment and into launchctl
#
# Added a new var to the mix - DOCKER_HOST_IP 
function useDockerMachine() {
  if [ $# -eq 0 ]; then
    if [ ! -f ~/.docker_env ]; then
      >&2 printf "Error: No ~/.docker_env file exists. Specify machine to use.\n"
      return
    fi
  else
    docker-machine env $1 > ~/.docker_env
    echo "export DOCKER_HOST_IP=\"$(docker-machine ip $1)\"" >> ~/.docker_env
  fi
  source ~/.docker_env
  for line in `set | grep '^DOCKER_.*'`; do
    pair=(${line//=/ })
    launchctl setenv ${pair[0]} "${pair[1]}"
  done
}

# When called with no argument, will remove all "docker-port-udp|tcp" rules found
# on the virtualbox matching DOCKER_MACHINE_NAME.
#
# For any other argument values we'll create a tcp/udp forwarding rule pair.
#
function useDockerPorts() {
  if [ $# -eq 0 ]; then
    RULES=$(VBoxManage showvminfo "${DOCKER_MACHINE_NAME}" | grep 'docker-port' | awk -F' ' '{print $6}' | sed -e 's/,//g')
    for RULE in ${RULES[@]}; do
      echo "Removing port forwarding rule ${RULE} from ${DOCKER_MACHINE_NAME} ..."
      VBoxManage modifyvm "${DOCKER_MACHINE_NAME}" --natpf1 delete "${RULE}"
    done
  else
    PORTS=( "$@" )
    for PORT in ${PORTS[@]}; do
      echo "Creating port forwarding rule for ${PORT} on ${DOCKER_MACHINE_NAME} ..."
      VBoxManage modifyvm "${DOCKER_MACHINE_NAME}" --natpf1 "docker-port-tcp${PORT},tcp,,${PORT},,${PORT}"
      VBoxManage modifyvm "${DOCKER_MACHINE_NAME}" --natpf1 "docker-port-udp${PORT},udp,,${PORT},,${PORT}"
    done
  fi
}

useDockerMachine
useDockerMachine default
useDockerPorts
useDockerPorts 8080