添加和更新虚拟机设备

运行中的虚拟机，需要更新虚拟机驱动，通过将.iso文件附加到虚拟机上来实现

• 如果虚拟机没有定义CDROM设备

可以通过以下命令添加设备

virsh attach-disk <GuestName> /dev/sr0 hdc --type cdrom

或者指向ISO文件：

virsh attach-disk <GuestName> ~/virtio-win-0.1-22.iso hdc --type cdrom

virsh attach-disk <GuestName> sample.iso hdc --type cdrom --mode readonly

• 如果虚拟机已经定义了CDROM设备或者已经添加了iso文件，则通过xml文件来更新设备

<disk type='block' device='cdrom'>
  <driver name='qemu' type='raw'/>
  <target dev='hdc' bus='ide'/>
  <readonly/>
  <alias name='ide0-1-0'/>
  <address type='drive' controller='0' bus='1' unit='0'/>
</disk>

然后执行

virsh update-device <GuestName> guest-device.xml

参考

• Attaching and updating a device with virsh
• APPENDIX A. USING VIRSH TO MOUNT A CD-ROM IMAGE ON AN INACTIVE DOMAIN
• How to connect a cdrom device to a kvm/qemu domain (using command-line tools)?