Hi there, I am using libvirt+qemu/kvm. For a guest VM that is running, I could change its cdrom media by running the following virsh command: virsh attach-disk <vm-id> <path-to-iso-file> hdc --driver file --type cdrom --mode readonly This will change the media in the cdrom for the guest VM. Once I am done, I can use virt-manager to disconnect the iso file to the cdrom. The resulting xml file looks like (only showing the relevant part) <disk type='file' device='cdrom'> <target dev='hdc' bus='ide'/> <readonly/> </disk> However, I am having trouble to do the same task (eject cd media) using virsh command. I am successful in running the "virsh attach-device 1 emptyCD.xml" command where the emptyCD.xml is an xml without the source file path, just like the one above. However, I want to do it by a single command without the need to create xml files. It should be something like
virsh attach-disk 1 "" hdc --driver file --type cdrom --mode readonly However, virsh does not like the empty string "".
I also looked at the virt-manager source code, in this case, the python script is 912 if curpath: 913 # Disconnect cdrom 914 self.change_cdrom_media(dev_id_info, None, _type=None) Basically a None parameter is pass to the API. All I need to find out is how to do the same thing in the "virsh attach-disk" command. Do you have any suggestions/comments? Thanks a lot. Shi -- Shi Jin, PhD
On Tue, Mar 09, 2010 at 02:06:02PM -0800, Shi Jin wrote:
Hi there,
I am using libvirt+qemu/kvm. For a guest VM that is running, I could change its cdrom media by running the following virsh command: virsh attach-disk <vm-id> <path-to-iso-file> hdc --driver file --type cdrom --mode readonly This will change the media in the cdrom for the guest VM.
Once I am done, I can use virt-manager to disconnect the iso file to the cdrom. The resulting xml file looks like (only showing the relevant part) <disk type='file' device='cdrom'> <target dev='hdc' bus='ide'/> <readonly/> </disk>
However, I am having trouble to do the same task (eject cd media) using virsh command. I am successful in running the "virsh attach-device 1 emptyCD.xml" command where the emptyCD.xml is an xml without the source file path, just like the one above. However, I want to do it by a single command without the need to create xml files. It should be something like
virsh attach-disk 1 "" hdc --driver file --type cdrom --mode readonly However, virsh does not like the empty string "".
Yeah this sounds like a virsh bug to me. One alternative is to just pass the XML snippet you show directly to 'virsh attach-device' which is what the 'attach-disk' command ends up calling itself Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
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Shi Jin