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45 <section id="overview">
46 <h1>PXE Boot Server Guide: Magic Dust for Network Boot</h1>
47 <p>Boot DevStack from a PXE server to a RAM disk.</p>
48 </section>
49
50 <section id="requirements">
51 <div class="page-header">
52 <h2>Prerequisites <small>Hardware & OpenWRT</small></h2>
53 </div>
54
55 <h3>Hardware</h3>
56 <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>
57
58 <h3>OpenWRT</h3>
59 <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>
60 </section>
61
62 <section id="installation">
63 <div class="page-header">
64 <h2>Installation <small>bit blasting</small></h2>
65 </div>
66
67 <h3>Install the Image</h3>
68 <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>
69 <ul>
70 <li>Get openwrt-ar71xx-wzr-hp-g300nh-squashfs-tftp.bin
71 <pre>wget http://openwrt.xr7.org/openwrt/ar71xx/openwrt-ar71xx-wzr-hp-g300nh-squashfs-tftp.bin</pre>
72 </li>
73 <li>Connect computer to LAN port 4 (closest to WAN port)</li>
74 <li>Set computer interface to IP address in the 192.168.11.2</li>
75 <li>Add static arp entry for router
76 <pre>arp -s 192.168.11.1 &lt;mac-address&gt;</pre>
77 </li>
78 <li>Start TFTP transfer attempt
79 <pre>tftp 192.168.11.1
80binary
81rexmt 1
82timeout 60
83put openwrt-ar71xx-wzr-hp-g300nh-squashfs-tftp.bin</pre>
84 </li>
85 <li>Power on router. Router will reboot and initialize on 192.168.1.1.</li>
86 <li>Delete static arp entry for router
87 <pre>arp -d 192.168.11.1</pre>
88 </li>
89 <li>Set computer to DHCP, connect and telnet to router and set root password.</li>
90 </ul>
91
92 <h3>Configure the Router</h3>
93 <ul>
94 <li>Update <code>/etc/opkg.conf</code> to point to our repo:
95 <pre>src/gz packages http://192.168.5.13/openwrt/build/ar71xx/packages</pre>
96 </li>
97 <li>Configure anon mounts:
98 <pre>uci delete fstab.@mount[0]
99uci commit fstab
100/etc/init.d/fstab restart</pre>
101 </li>
102 <li>Reset the DHCP address range. DevStack will claim the upper
103 /25 of the router's LAN address space for floating IPs so the
104 default DHCP address range needs to be moved:
105 <pre>uci set dhcp.lan.start=65
106uci set dhcp.lan.limit=60
107uci commit dhcp</pre>
108 </li>
109 <li>Enable TFTP:
110 <pre>uci set dhcp.@dnsmasq[0].enable_tftp=1
111uci set dhcp.@dnsmasq[0].tftp_root=/mnt/sda1/tftpboot
112uci set dhcp.@dnsmasq[0].dhcp_boot=pxelinux.0
113uci commit dhcp
114/etc/init.d/dnsmasq restart</pre>
115 </li>
116 </ul>
117
118 <h3>Set Up tftpboot</h3>
119 <ul>
120 <li>Create the <code>/tmp/tftpboot</code> structure and populate it:
121 <pre>cd ~/devstack
122tools/build_pxe_boot.sh /tmp</pre>
123 This calls <code>tools/build_ramdisk.sh</code> to create a 2GB ramdisk
124 containing a complete development Oneiric OS plus the
125 OpenStack code checkouts.
126 </li>
127 <li>Copy <code>tftpboot</code> to a USB drive:
128 <pre>mount /dev/sdb1 /mnt/tmp
129rsync -a /tmp/tftpboot/ /mnt/tmp/tftpboot/
130umount /mnt/tmp</pre>
131 </li>
132 <li>Plug USB drive into router. It will be automounted and is ready to serve content.</li>
133 </ul>
134
135 <p>Now <a href="ramdisk.html">return</a> to the RAM disk Guide to kick
136 off your DevStack experience.</p>
137
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