[glance] Does glance not support using local filesystem storage in a cluster

韩光宇 hanguangyu2 at gmail.com
Thu Jan 6 09:41:37 UTC 2022


Yes, you are right. I have deploied a ceph as the backend storage of
glance, cinder and nova.  And it can resolve this question.

But I wonder why it's designed this way. It doesn't fit my perception
of OpenStack.

As currently designed, local storage of glance must not be used in the
cluster. Why not record the host where the image resides? Just like
the local storage of the nova-compute node, if a Glance node breaks
down, the image on the host cannot be accessed.

Sorry that maybe this idea is unreasonable and stupid. Could anyone
tell me the reason or what's the problem with that

best wishes to you, love you.

Thank you,
Han Guangyu

Eugen Block <eblock at nde.ag> 于2022年1月6日周四 17:03写道:
> Hi,
> if you really aim towards a highly available cluster you'll also need
> a ha storage solution like ceph. Having glance images or VMs on local
> storage can make it easier to deploy, maybe for testing and getting
> involved with openstack, but it's not really recommended for
> production use. You'll probably have the same issue with cinder
> volumes, I believe. Or do you have a different backend for cinder?
> Regards,
> Eugen
> Zitat von 韩光宇 <hanguangyu2 at gmail.com>:
> > Deal all,
> >
> > Sorry that maybe I ask a stupid question. But I'm really confused with
> > it and didn't find discuss in glance
> > document(https://docs.openstack.org/glance/latest/).
> >
> >  I have a OpenStack Victoria cluster with three all-in-one node in
> > centos8. I implemented it with reference to
> > https://docs.openstack.org/ha-guide/. So this cluster use Pacemaker,
> > HAproxy and Galera. "To implement high availability, run an instance
> > of the database on each controller node and use Galera Cluster to
> > provide replication between them."
> >
> > I found that I will encounter an error If I configure Glance backend
> > to use local storage driver to store image files on the local disk. If
> > I upload a image, this image only will be storaged in one node. But
> > the database only storage the file path of image such as
> > "/v2/images/aa3cbee0-717f-4699-8cca-61243302d693/file", don't have the
> > host information. The database data is same in three node.
> >
> > If I upload a image in node1, image only is storaged in node1. The
> > database of three node stores the local filesystem path of image. And
> > If The create Instance task is assigned to node2, It will find image
> > in node2, but image can't be found in node2. So we get the "Image has
> > no associated data" error.
> >
> > So I want to ask:
> > 1. Wheter glance does not support using local filesystem storage in
> > a cluster?
> > 2. If 1 was right, why do we do this design instead of storing
> > information about the host on which images is located, as nova does
> > with instance.
> >
> > I would appreciate any kind of guidance or help.
> >
> > Thank you,
> > Han Guangyu

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