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<h1>USB Boot: Undoable Stack Boot</h1>
<p>Boot DevStack from a USB disk into a RAM disk.</p>
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<section id="requirements">
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<h2>Prerequisites</h2>
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<h3>Hardware</h3>
<p>This guide covers the creation of a bootable USB drive. Your
computer BIOS must support booting from USB and You will want at least 3GB of
RAM. You also will need a USB drive of at least 2GB.</p>
<h3>Software</h3>
<p>Ubuntu 11.10 (Oneiric Ocelot) is required on host to create images.</p>
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<h2>Installation <small>bit blasting</small></h2>
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<h3>Set Up USB Drive</h3>
<ul>
<li>Insert the USB drive into the computer. Make a note of the device name, such as
<code>sdb</code>. Do not mount the device.</li>
<li>Install the boot system:
<pre>tools/build_usb_boot.sh /dev/sdb1</pre>
<p>This calls tools/build_ramdisk.sh to create a 2GB ramdisk
containing a complete development Oneiric OS plus the
OpenStack code checkouts. It then writes a syslinux boot sector
to the specified device and creates <code>/syslinux</code>.</p>
</li>
<li>If desired, you may now mount the device:
<pre>mount /dev/sdb1 /mnt/tmp
# foo
umount /mnt/tmp</pre>
</li>
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<p>Now <a href="ramdisk.html">return</a> to the RAM disk Guide to kick
off your DevStack experience.</p>
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