83 lines
4.3 KiB
XML
83 lines
4.3 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<chapter 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="ch_converting">
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<title>Converting between image formats</title>
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<para>Converting images from one format to another is generally straightforward.</para>
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<simplesect>
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<title>qemu-img convert: raw, qcow2, qed, vdi, vmdk, vhd</title>
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<para>The <command>qemu-img convert</command> command can do conversion between multiple
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formats, including qcow2, qed, raw, vdi, vhd, and vmdk.</para>
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<table
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rules="all">
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<caption>qemu-img format strings</caption>
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<thead>
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<tr>
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<th>Image format</th>
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<th>Argument to qemu-img</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>QCOW2 (KVM, Xen)</td>
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<td><literal>qcow2</literal></td>
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</tr>
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<tr>
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<td>QED (KVM)</td>
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<td><literal>qed</literal></td>
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</tr>
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<tr>
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<td>raw</td>
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<td><literal>raw</literal></td>
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</tr>
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<tr>
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<td>VDI (VirtualBox)</td>
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<td><literal>vdi</literal></td>
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</tr>
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<tr>
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<td>VHD (Hyper-V)</td>
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<td><literal>vpc</literal></td>
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</tr>
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<tr>
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<td>VMDK (VMware)</td>
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<td><literal>vmdk</literal></td>
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</tr>
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</tbody>
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</table>
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<para>This example will convert a raw image file named <filename>centos7.img</filename> to a qcow2 image file.</para>
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<para>
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<screen><prompt>$</prompt> <userinput>qemu-img convert -f raw -O qcow2 centos7.img centos7.qcow2</userinput></screen>
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</para>
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<para>Run the following command to convert a vmdk image file to a raw image file.
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<screen><prompt>$</prompt> <userinput>qemu-img convert -f vmdk -O raw centos7.vmdk centos7.img</userinput></screen>
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</para>
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<para>Run the following command to convert a vmdk image file to a qcow2 image file.
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<screen><prompt>$</prompt> <userinput>qemu-img convert -f vmdk -O qcow2 centos7.vmdk centos7.qcow2</userinput></screen>
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</para>
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<para>
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<note>
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<para>The <literal>-f <replaceable>format</replaceable></literal> flag is optional.
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If omitted, <command>qemu-img</command> will try to infer the image format.</para>
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<para>When converting an image file with Windows OS, ensure the virtio driver is
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installed. Otherwise, you will get a blue screen of death or BSOD when
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launching the image due to lack of the virtio driver. Another option is to
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set the image properties as below when you update the image in glance to
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avoid this issue, but it will reduce performance significantly.</para>
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<screen><prompt>$</prompt> <userinput>glance image-update --property hw_disk_bus='ide' image_id</userinput></screen>
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</note>
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</para>
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</simplesect>
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<simplesect>
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<title>VBoxManage: VDI (VirtualBox) to raw</title>
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<para>If you've created a VDI image using VirtualBox, you can convert it to raw format using
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the <command>VBoxManage</command> command-line tool that ships with VirtualBox. On Mac
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OS X, and Linux, VirtualBox stores images by default in the <filename>~/VirtualBox VMs/</filename>
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directory. The following example creates a raw image in the current directory from a
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VirtualBox VDI image.</para>
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<screen><prompt>$</prompt> <userinput>VBoxManage clonehd ~/VirtualBox\ VMs/fedora21.vdi fedora21.img --format raw</userinput></screen>
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</simplesect>
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</chapter>
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