[glance] [ops] Glance deployed on 2 nodes with rbd. Do I need a shared filesystem for the reserved stores ?

Abhishek Kekane akekane at redhat.com
Fri Mar 26 06:05:51 UTC 2021

Hi Massimo,

If you are planning to use glance-direct import method then you need to
configure os_glance_staging_store using a shared filesystem. If you plan to
use only web-download and copy-image import methods then you don't need a
shared filesystem for os_glance_staging_store.

If glance-direct needs to be used then the below path needs to be on a
shared file system.
filesystem_store_datadir = /path/to/staging/store

If only web-download and copy-image import methods will be used then still
you need to set the above section in glance-api.conf but no need for a
shared filesystem in this case.

Thanks & Best Regards,

Abhishek Kekane

On Fri, Mar 26, 2021 at 11:29 AM Massimo Sgaravatto <
massimo.sgaravatto at gmail.com> wrote:

> We are using OpenStack Train but we plan to migrate soon to something newer
> The glance-api service is deployed on 2 nodes.
> We used to have 2 backends for glance (file and rbd) but now we want to
> use only ceph. So I guess the configuration for the stores can be simply
> something like this [*]
> Reading:
> https://docs.openstack.org/glance/train/admin/multistores.html
> is not too clear to me if I have to configure somewhere
> filesystem_store_datadir.
> In particular do I have to configure the  [os_glance_tasks_store] and
> [os_glance_staging_store] reserved stores ?
> If so, do I still need shared (between the 2 glance-api nodes )filesystems
> for them ?
> Thanks, Massimo
> [*]
> enabled_backends = rbd:rbd
> [glance_store]
> default_backend = rbd
> [rbd]
> store_description = Ceph in replica 3
> rbd_store_pool = glance-cloudtest
> rbd_store_user = glance-cloudtest
> rbd_store_ceph_conf = /etc/ceph/ceph.conf
> rbd_store_chunk_size = 8
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