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

Eugen Block eblock at nde.ag
Thu Jan 6 08:56:12 UTC 2022


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?


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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