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14.5.23. 创建虚拟机 XML 转储（配置文件）

使用 virsh 输出客户机虚拟机的 XML 配置文件： 
# virsh dumpxml {guest-id, guestname or uuid}
此命令将 guest 虚拟机的 XML 配置文件输出到标准输出(stdout)。您可以通过将输出传送到文件来保存数据。将输出传送至名为 guest.xml 的文件的示例： 
# virsh dumpxml GuestID > guest.xml
此文件的 guest.xml 可以重新创建客户端虚拟机（请参阅 第 14.6 节 “编辑客户机虚拟机的配置文件” ）。您可以编辑此 XML 配置文件来配置附加设备或部署额外的客户端虚拟机。
virsh dumpxml 输出的示例： 
# virsh dumpxml guest1-rhel6-64
<domain type='kvm'>
  <name>guest1-rhel6-64</name>
  <uuid>b8d7388a-bbf2-db3a-e962-b97ca6e514bd</uuid>
  <memory>2097152</memory>
  <currentMemory>2097152</currentMemory>
  <vcpu>2</vcpu>
  <os>
    <type arch='x86_64' machine='rhel6.2.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='threads'/>
      <source file='/home/guest-images/guest1-rhel6-64.img'/>
      <target dev='vda' bus='virtio'/>
      <shareable/<
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <interface type='bridge'>
      <mac address='52:54:00:b9:35:a9'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
    <sound model='ich6'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </sound>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </memballoon>
  </devices>
</domain>
请注意，设置了 <shareable/> 标志。这表示在域间应该共享该设备（假设管理程序和操作系统支持），这意味着应该为该设备取消激活缓存。