[Openstack-operators] Creating nova instance without backing image

Abel Lopez alopgeek at gmail.com
Wed May 21 18:03:39 UTC 2014

No, I just looked through nova.conf reference and glance-api.conf reference and there is no option for NOT using the backing image.

When migrating a bare metal system, you should really ensure that things like logs are purged, even home directories, etc.
Best practice to have /var mounted on a separate partition too.
On May 21, 2014, at 10:41 AM, Daniel Speichert <daniel at speichert.pl> wrote:

> Hi,
> In our OpenStack installation (Havana, RDO), we use Ceph as storage as
> Nova, Glance and Cinder backend.
> On compute nodes, instance's disks are kept on Ceph but base images are
> copied from Glance (Ceph) to local disk. This works well with small
> images of OS's.
> However, if we upload a big image (e.g. migrating bare hardware system
> to the cloud) that is only used by one instance, the image becomes the
> backing file stored locally on the compute node. Here, the compute node
> hit disk space limit because we expect all the data to reside on Ceph.
> Is there any way to tell Nova to not use backing image for an instance?
> Maybe there exists a special image property to set that tells Nova to
> copy the whole image, which would put it entirely in Ceph without a
> backing file?
> I hope this use case makes sense for and I'd appreciate if you had any
> suggestions how to resolve this issue.
> Best,
> Daniel
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