75 lines
3.1 KiB
XML
75 lines
3.1 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE section [
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<!-- Some useful entities borrowed from HTML -->
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<!ENTITY ndash "–">
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<!ENTITY mdash "—">
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<!ENTITY hellip "…">
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]>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
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xml:id="dashboard_launch_instances_from_volume">
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<title>Launch an instance from a volume</title>
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<?dbhtml stop-chunking?>
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<para>You can launch an instance directly from an image that has
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been copied to a persistent volume.</para>
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<procedure>
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<!--<title>To launch an instance from a volume</title> -->
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<step>
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<para>Create a volume that is large enough to store an
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unzipped image.</para>
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</step>
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<step>
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<para>Create an image.</para>
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<para>For details, see <link
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xlink:href="http://docs.openstack.org/image-guide/content/ch_creating_images_manually.html"
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>Creating images manually</link> in the
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<citetitle>OpenStack Virtual Machine Image
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Guide</citetitle>.</para>
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</step>
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<step>
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<para>Launch an instance.</para>
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</step>
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<step>
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<para>Attach the volume to the instance.</para>
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</step>
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<step>
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<para>Assuming that the attached volume is mounted as
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<literal>/dev/vdb</literal>, use one of the
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following commands to copy the image to the attached
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volume:</para>
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<itemizedlist>
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<listitem>
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<para>For a raw image:</para>
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<screen><prompt>$</prompt> <userinput>cat IMAGE >/dev/vdb</userinput></screen>
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<para>Alternatively, use
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<command>dd</command>.</para>
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</listitem>
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<listitem>
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<para>For a non-raw image:</para>
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<screen><prompt>$</prompt> <userinput>qemu-img convert -O raw IMAGE /dev/vdb</userinput></screen>
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</listitem>
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<listitem>
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<para>For a *.tar.bz2 image:</para>
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<screen><prompt>$</prompt> <userinput>tar xfjO IMAGE >/dev/vdb</userinput></screen>
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</listitem>
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</itemizedlist>
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</step>
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<step>
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<para>Because only <emphasis role="italic"
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>detached</emphasis> volumes are available for
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booting, detach the volume.</para>
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</step>
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<step>
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<para>Now, you can launch an instance from an image
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that has been copied to the volume. The
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instance is booted from the volume, which is provided
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by <systemitem class="service"
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>nova-volume</systemitem> through iSCSI. To launch
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an instance from the volume, see <xref
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linkend="dashboard_launch_instances_from_image"
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/>.</para>
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</step>
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</procedure>
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</section>
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