Add a demo using Vagrant

Adds a demo using a Vagrantfile to connect a VM to the host's network,
and a script to start the Docker container and the VM together.

.dockerignore

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+vagrant-demo/

.gitignore

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+vagrant-demo/.vagrant

vagrant-demo/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+Vagrant.configure("2") do |config|
+  config.vm.box = "clink15/pxe"
+
+  # Bridge the VM onto your host's network
+  config.vm.network "public_network"
+
+  # Don't wait for VM to boot - it won't finish anyway
+  config.vm.boot_timeout = 5
+
+  config.vm.provider "virtualbox" do |vb|
+      # Display the GUI so we can see what it does
+      vb.gui = true
+
+      # Add enough RAM to download Ubuntu live
+      vb.memory = 5120
+
+      # Enable PXE boot as the only option
+      vb.customize ["modifyvm", :id, "--boot1", "net"]
+
+      # Disconnect the default NIC
+      vb.customize ["modifyvm", :id, "--nic1", "none"]
+  end
+end

vagrant-demo/run-demo.sh

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+#!/bin/bash
+
+DHCP_RANGE_START=${1:-192.168.0.1}
+
+# Start the netboot container and run it in the background
+docker run --net=host -e DHCP_RANGE_START=${DHCP_RANGE_START} samdbmg/dhcp-netboot.xyz &
+DOCKER_PROCESS=$!
+
+# Catch ctrl-c and clean up
+function cleanup() {
+    echo "Caught SIGINT, stopping VM"
+    vagrant destroy -f
+
+    echo "Waiting for Docker to stop"
+    wait ${DOCKER_PROCESS}
+
+    exit 0
+}
+trap cleanup INT
+
+# Bring up the VM - this will fail because Vagrant can't SSH to it, but that's fine
+vagrant up || true
+
+# Wait for Ctrl-C
+while true; do
+    sleep 10
+done