libvirt users - Aug 2011 - virt-manager - how to add /dev/mapper as a storage pool

Hi,

I would like to be able to configure VMs running off dm-crypt devices
that were unlocked in the host. Unlocked dm-crypt devices show up in
/dev/mapper/devicename, with devicename being the second parameter
given to cryptsetup luksOpen.

The LVM storage pool type insists on searching in /dev/vgname and
cannot be tricked into reading /dev/mapper by giving it a fake VG
named mapper; the LVM storage pool type "dir" mishandles
/dev/mapper/control ("illegal seek").

Is there a workaround to be able to use such devices in virt-manager
without having to define a single storage pool for every device used?

Greetings
Marc

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On 08/08/2011 04:37 PM, Marc Haber wrote:
> Hi,
> 
> I would like to be able to configure VMs running off dm-crypt devices
> that were unlocked in the host. Unlocked dm-crypt devices show up in
> /dev/mapper/devicename, with devicename being the second parameter
> given to cryptsetup luksOpen.
> 
> The LVM storage pool type insists on searching in /dev/vgname and
> cannot be tricked into reading /dev/mapper by giving it a fake VG
> named mapper; the LVM storage pool type "dir" mishandles
> /dev/mapper/control ("illegal seek").
> 
> Is there a workaround to be able to use such devices in virt-manager
> without having to define a single storage pool for every device used?
> 
> Greetings
> Marc
> 
cc-ing virt-tool-list

Latest virt-manager-0.9.0 allows adding a libvirt mpath pool which might
be what you're looking for. If you don't have that version you can try
configuring it on the command line with virsh. Some more info:

http://libvirt.org/storage.html#StorageBackendMultipath

- Cole