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Re: [Wg-openstack] Oracle VM with Nova/libvirtd/libguestfs

Just to fill in a bit more in case anyone else hits this problem.

In my setup I was bind mounting /var/lib/nova into my nova_compute container.
However there was also a volume reference in the nova_data container to
"/var/lib/nova/instances", preventing visibility of this path from the host and
thus blocking  libguestfs from inspecting the qcow2 image.
When I removed this volume reference from the data container, libguestfs was
able to see the image and libvirt proceeded to create the vm.


On 01/13/2016 01:13 PM, Joao Martins wrote:
On 01/13/2016 12:42 PM, Anthony PERARD wrote:
Hi Mark,

On Tue, Jan 12, 2016 at 05:45:11PM +0000, Mark Duggan wrote:
The system I'm using the following xen pkg versions:

With the following libvirt pkg versions:
Those packages might missing a few patches, but I think are for stability.
List is here: 
Or those patches might already be included in the package.
Those patches are included already in package.

I'm running a Kilo nova_compute as a docker container, directly on my
my OVM/Xen instance.  Libvirtd is running natively on OVM.

So, what I'm seeing is that when I  try to create a VM from nova
with something like:

"docker-ostk nova boot --image cirros1 --flavor m1small manual20"

The process  gets as far as a libvirt talking to libguestfs but
it seems to get into trouble before requesting xl to instantiate the vm.
Here's a snip from the nova_compute logs:
{"log":"Original error from libvirt: Cannot access storage file
'/tmp/libguestfsBgj7ba/overlay2' (as uid:107, gid:107): No such file or
directory [code=38 domain=18]). Cannot
That might be the issue. Do nova_compute and libvirtd share the same
filesystem? I guest not due to one been in a container and the other one

Indeed some of the directories weren't shared between the nova_compute container
and libvirtd and that caused first the complain below and after that the image
backing file as non existent. But it was fixed a while back, having the right
bind mounts on the container. Thanks for the feedback!

2016-01-12 12:21:24.154+0000: 8605: error :
virStorageFileGetMetadataRecurse:2836 : Cannot access storage file
'/tmp/libguestfseSpFZD/overlay2' (as uid:107, gid:107): No such file or

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