PXE on VM

pxe-on-vm/.gitignore

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+.vagrant
+*~

pxe-on-vm/README.md

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+# PXE in VM
+
+I want to be able to test the auto-installation of Kubernetes cluster
+on a VM cluster.  To do this, I need to set up a PXE server in this VM
+cluster and use it to boot other VMs.
+
+## VM DHCP Server
+
+To test that if a VM could be a DHCP server, I created two VMs --
+[pxe-vm](./pxe-vm) and [boot-tester-vm](./boot-tester-vm) on my
+MacBook Pro using Vagrant.  The pxe-vm's
+[provisioning script](./pxe-vm/bootstrap.sh) configures a DHCP server.
+This script is a script representation of steps listed in the PXE on
+Raspberry Pi
+[tutorial](https://github.com/k8sp/bare-metal-coreos/tree/master/pxe-on-rasppi).
+
+It is notable that both pxe-vm and boot-tester-vm have *bridged*
+network, so logically, they connect directly to the LinkSys router.  I
+guess that I might be create a VirtualBox host-only network to mimic
+the real LinkSys router.  I might try that later.
+
+<img src="network.png" />
+
+It is important to manually configure the bridged network on pxe-vm to
+the *promiscuous mode*.

pxe-on-vm/boot-tester-vm/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+Vagrant.configure("2") do |config|
+
+  config.vm.box = "ubuntu/trusty64"
+  config.vm.network "public_network"
+
+end

pxe-on-vm/network.dot

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+graph G {
+	router [label="Linksys Router"];
+
+	subgraph clusterH {
+		label = "MacBook Pro";
+		pxe_vm [label="PXE VM server"];
+		boot_tester [label="Boot tester VM"];
+	}
+
+	pxe_vm -- router [label="bridged\npromiscuous mode", style=dotted];
+	boot_tester -- router [label="bridged", style=dotted];
+}

pxe-on-vm/pxe-vm/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+Vagrant.configure("2") do |config|
+  config.vm.box = "ubuntu/trusty64"
+
+  config.vm.network "public_network", ip: "192.168.2.10"
+
+  config.vm.provision "shell", path: "bootstrap.sh"
+
+   config.vm.provider :virtualbox do |vb|
+    # enable promiscuous mode on the public network
+    vb.customize ["modifyvm", :id, "--nicpromisc3", "allow-all"]
+  end
+end

pxe-on-vm/pxe-vm/bootstrap.sh

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+#!/usr/bin/env bash
+
+echo "Hello! Here we are going to configure this VM a PXE server for
+booting CoreOS.  This bootstraping script comes from
+https://github.com/k8sp/bare-metal-coreos/tree/master/pxe-on-rasppi"
+
+apt-get update
+
+## DHCP Server
+apt-get install -y isc-dhcp-server
+
+# Note that we don't edit /etc/network/interfaces as documented in
+# https://github.com/k8sp/bare-metal-coreos/tree/master/pxe-on-rasppi,
+# because in our Vagrantfile, we have
+#
+#   config.vm.network "public_network", ip: "192.168.2.10"
+#
+# which sets the static IP 192.168.2.10 on the bridged NIC.
+
+cat > /etc/dhcp/dhcpd.conf <<EOF
+subnet 192.168.2.0 netmask 255.255.255.0 {
+    range 192.168.2.11 192.168.2.249;
+    option routers 192.168.2.1;
+    option broadcast-address 192.168.2.255;
+    option domain-name-servers 8.8.8.8;
+}
+
+next-server 192.168.2.10;
+filename "pxelinux.0";
+EOF
+
+service isc-dhcp-server restart
+