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

[Mark Duggan <mark.duggan@xxxxxxxxxx>]

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.

--Mark

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:
> > > xen-4.4.4-65.el6.x86_64
> > >
> > > With the following libvirt pkg versions:
> > > libvirt-1.2.14-4.el6.x86_64
> > Those packages might missing a few patches, but I think are for stability.
> > List is here: 
> > http://wiki.xen.org/wiki?title=OpenStack_CI_Loop_for_Xen-Libvirt&oldid=15162#Baseline
> > 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
> > > resize.\n","stream":"stderr","time":"2016-01-12T12:25:51.400006722Z"}
> > 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
> > outside.
> 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
> > > directory

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