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<section id="overview">
<h1>PXE Boot Server Guide: Magic Dust for Network Boot</h1>
<p>Boot DevStack from a PXE server to a RAM disk.</p>
</section>
<section id="requirements">
<div class="page-header">
<h2>Prerequisites <small>Hardware & OpenWRT</small></h2>
</div>
<h3>Hardware</h3>
<p>The whole point of this exercise is to have a highly portable boot server, so using a small router with a USB port is the desired platform. This guide uses a Buffalo WZR-HP-G300NH as an example, but it is easily generalized for other supported platforms. See openwrt.org for more.</p>
<h3>OpenWRT</h3>
<p>Any recent 'Backfire' build of OpenWRT will work for the boot server project. We build from trunk and have made the images available at <a href="http://openwrt.xr7.org/openwrt">http://openwrt.xr7.org/openwrt</a>.</p>
</section>
<section id="installation">
<div class="page-header">
<h2>Installation <small>bit blasting</small></h2>
</div>
<h3>Install the Image</h3>
<p>This process follows <a href="http://wiki.openwrt.org/toh/buffalo/wzr-hp-g300h">the OpenWRT doc OEM Install</a> to tftp the new image onto the router. You need a computer to set up the router, we assume it is a recent Linux or OS/X installation.</p>
<ul>
<li>Get openwrt-ar71xx-wzr-hp-g300nh-squashfs-tftp.bin
<pre>wget http://openwrt.xr7.org/openwrt/ar71xx/openwrt-ar71xx-wzr-hp-g300nh-squashfs-tftp.bin</pre>
</li>
<li>Connect computer to LAN port 4 (closest to WAN port)</li>
<li>Set computer interface to IP address in the 192.168.11.2</li>
<li>Add static arp entry for router
<pre>arp -s 192.168.11.1 <mac-address></pre>
</li>
<li>Start TFTP transfer attempt
<pre>tftp 192.168.11.1
binary
rexmt 1
timeout 60
put openwrt-ar71xx-wzr-hp-g300nh-squashfs-tftp.bin</pre>
</li>
<li>Power on router. Router will reboot and initialize on 192.168.1.1.</li>
<li>Delete static arp entry for router
<pre>arp -d 192.168.11.1</pre>
</li>
<li>Set computer to DHCP, connect and telnet to router and set root password.</li>
</ul>
<h3>Configure the Router</h3>
<ul>
<li>Update <code>/etc/opkg.conf</code> to point to our repo:
<pre>src/gz packages http://192.168.5.13/openwrt/build/ar71xx/packages</pre>
</li>
<li>Configure anon mounts:
<pre>uci delete fstab.@mount[0]
uci commit fstab
/etc/init.d/fstab restart</pre>
</li>
<li>Reset the DHCP address range. DevStack will claim the upper
/25 of the router's LAN address space for floating IPs so the
default DHCP address range needs to be moved:
<pre>uci set dhcp.lan.start=65
uci set dhcp.lan.limit=60
uci commit dhcp</pre>
</li>
<li>Enable TFTP:
<pre>uci set dhcp.@dnsmasq[0].enable_tftp=1
uci set dhcp.@dnsmasq[0].tftp_root=/mnt/sda1/tftpboot
uci set dhcp.@dnsmasq[0].dhcp_boot=pxelinux.0
uci commit dhcp
/etc/init.d/dnsmasq restart</pre>
</li>
</ul>
<h3>Set Up tftpboot</h3>
<ul>
<li>Create the <code>/tmp/tftpboot</code> structure and populate it:
<pre>cd ~/devstack
tools/build_pxe_boot.sh /tmp</pre>
This calls <code>tools/build_ramdisk.sh</code> to create a 2GB ramdisk
containing a complete development Oneiric OS plus the
OpenStack code checkouts.
</li>
<li>Copy <code>tftpboot</code> to a USB drive:
<pre>mount /dev/sdb1 /mnt/tmp
rsync -a /tmp/tftpboot/ /mnt/tmp/tftpboot/
umount /mnt/tmp</pre>
</li>
<li>Plug USB drive into router. It will be automounted and is ready to serve content.</li>
</ul>
<p>Now <a href="ramdisk.html">return</a> to the RAM disk Guide to kick
off your DevStack experience.</p>
</section>
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