55 lines
2.4 KiB
XML
55 lines
2.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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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"
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version="5.0"
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xml:id="qemu">
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<?dbhtml stop-chunking?>
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<title>QEMU</title>
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<para>From the perspective of the Compute service, the QEMU hypervisor is very similar to the KVM
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hypervisor. Both are controlled through libvirt, both support the same feature set, and all
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virtual machine images that are compatible with KVM are also compatible with QEMU. The main
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difference is that QEMU does not support native virtualization. Consequently, QEMU has worse
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performance than KVM and is a poor choice for a production deployment.</para>
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<para>The typical uses cases for QEMU are<itemizedlist>
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<listitem>
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<para>Running on older hardware that lacks
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virtualization support.</para>
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</listitem>
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<listitem>
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<para>Running the Compute service inside of a virtual
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machine for development or testing purposes, where
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the hypervisor does not support native
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virtualization for guests.</para>
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</listitem>
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</itemizedlist></para>
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<para>To enable QEMU, add these settings to
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<filename>nova.conf</filename>:<programlisting language="ini">compute_driver = libvirt.LibvirtDriver
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[libvirt]
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virt_type = qemu</programlisting></para>
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<para>
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For some operations you may also have to install the <command>guestmount</command> utility:</para>
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<para>On Ubuntu:
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<screen><prompt>#</prompt> <userinput>apt-get install guestmount</userinput></screen>
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</para>
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<para>On Red Hat Enterprise Linux, Fedora, or CentOS:
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<screen><prompt>#</prompt> <userinput>yum install libguestfs-tools</userinput></screen>
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</para>
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<para>On openSUSE:
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<screen><prompt>#</prompt> <userinput>zypper install guestfs-tools</userinput></screen>
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</para>
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<para>The QEMU hypervisor supports the following virtual machine image formats:</para>
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<itemizedlist>
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<listitem>
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<para>Raw</para>
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</listitem>
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<listitem>
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<para>QEMU Copy-on-write (qcow2)</para>
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</listitem>
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<listitem>
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<para>VMware virtual machine disk format (vmdk)</para>
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</listitem>
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</itemizedlist>
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</section>
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