Re: [libvirt] Mounting a raw DVD

On 2009-11-10, at 12:48 AM, Gerry Reno wrote: > Adam Mooz wrote: >> On 2009-11-09, at 11:46 PM, Gerry Reno wrote: >> >>> Adam Mooz wrote: >>>> Hello List, >>>> >>>> I'm attempting to pass a DVD drive of a headless server into a >>>> virtual machine. So far I've managed to mount *something* into >>>> the VM, but it's being registered as a blank DVD within the VM. >>>> When I mount /dev/dvd into the bare-metal machine it registers >>>> normally as the DVD. How do I pass physical drives into a VM and >>>> back out using libvirt? Command used: >>>> #virsh attach-disk Montreal /dev/dvd hdc --mode readonly --driver >>>> phy --type cdrom >>>> Connecting to uri: qemu:///system >>>> Disk attached successfully >>>> >>>> VM XML file: >>>> >>>> <domain type='kvm'> >>>> <name>Montreal</name> >>>> <uuid>0f79ba7f-27bf-16a0-5887-6cfa2b5569f1</uuid> >>>> <memory>2097152</memory> >>>> <currentMemory>2097152</currentMemory> >>>> <vcpu>1</vcpu> >>>> <os> >>>> <type arch='x86_64' machine='pc-0.11'>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/bin/kvm</emulator> >>>> <disk type='file' device='cdrom'> >>>> <target dev='hdc' bus='ide'/> >>>> <readonly/> >>>> </disk> >>>> <disk type='file' device='disk'> >>>> <source file='(Mangled Purposely)'/> >>>> <target dev='vda' bus='virtio'/> >>>> </disk> >>>> <interface type='bridge'> >>>> <mac address='(mangled purposly)/> <source bridge='br0'/> >>>> <model type='virtio'/> >>>> </interface> >>>> <serial type='pty'> >>>> <target port='0'/> >>>> </serial> >>>> <console type='pty'> >>>> <target port='0'/> >>>> </console> >>>> <input type='mouse' bus='ps2'/> >>>> <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/> >>>> <video> >>>> <model type='cirrus' vram='9216' heads='1'/> >>>> </video> >>>> </devices> >>>> </domain> >>>> >>> >>> I haven't done this for a while but I believe you have to issue a >>> 'detach' command afterwards. >>> >>> -Gerry >>> >>> -- >>> Libvir-list mailing list >>> Libvir-list(a)redhat.com <mailto:Libvir-list@redhat.com> >>> <mailto:Libvir-list@redhat.com> >>> https://www.redhat.com/mailman/listinfo/libvir-list >> >> # virsh detach-disk Montreal hdc >> Connecting to uri: qemu:///system >> error: this function is not supported by the hypervisor: only SCSI >> or virtio disk device can be detached dynamically >> >> ? Also, I'm not sure if you understood my question. When I pass in >> the DVD device into the VM it registers as a blank DVD. if I pass >> in a non-existant folder it blows up, so I know it's reading >> something from the real DVD drive. Mounting the real DVD drive in >> the bare-metal machine shows the files on the drive, but I cannot >> get them to appear in the VM. How do I get the same files to show >> up in the VM (i.e. mount the DVD drive into the VM)? >> >> > I didn't see /dev/dvd in your xml. If you attach it and then dump > the xml what does it look like? And then have you tried booting the > VM with an xml file with this device and can you read the files on > the device this way? > > The other thing is that maybe your version of libvirt is too old. I > think 0.7.1 is current. > > -Gerry > > > -- > Libvir-list mailing list > Libvir-list(a)redhat.com <mailto:Libvir-list@redhat.com> > https://www.redhat.com/mailman/listinfo/libvir-list Booting with the drive specified within the XML also gives a blank DVD in the VM, no luck there. It turns out I'm running libvirt 7.0, was there a large change between 7.0 and 7.1 in the way they handle mounting block devices? Here is some more output: After mounting at runtime, not at boot to the VM. virsh # dumpxml Montreal <domain type='kvm' id='3'> <name>Montreal</name> <uuid>0f79ba7f-27bf-16a0-5887-6cfa2b5569f1</uuid> <memory>2097152</memory> <currentMemory>2097152</currentMemory> <vcpu>4</vcpu> <os> <type arch='x86_64' machine='pc-0.11'>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/bin/kvm</emulator> <disk type='block' device='cdrom'> <source dev='/dev/dvd'/> <target dev='hdc' bus='ide'/> <readonly/> </disk> <disk type='file' device='disk'> <source file='/mnt/vmdrive/Montreal-ubuntu-media/montreal.vmdk'/> <target dev='vda' bus='virtio'/> </disk> <interface type='bridge'> <mac address='54:52:00:63:bf:8d'/> <source bridge='br0'/> <target dev='vnet0'/> <model type='virtio'/> </interface> <serial type='pty'> <source path='/dev/pts/1'/> <target port='0'/> </serial> <console type='pty' tty='/dev/pts/1'> <source path='/dev/pts/1'/> <target port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' keymap='en-us'/> <video> <model type='cirrus' vram='9216' heads='1'/> </video> </devices> <seclabel type='dynamic' model='apparmor'> <label>libvirt-0f79ba7f-27bf-16a0-5887-6cfa2b5569f1</label> <imagelabel>libvirt-0f79ba7f-27bf-16a0-5887-6cfa2b5569f1</imagelabel> </seclabel> </domain> virsh # version Compiled against library: libvir 0.7.0 Using library: libvir 0.7.0 Using API: QEMU 0.7.0 Running hypervisor: QEMU 0.11.0