RE: Problème with image from snapshot

DHilsbos at DHilsbos at
Wed Oct 13 15:16:28 UTC 2021


I only see one issue with what you said, or perhaps didn't say.  You are aware that it is a very good idea to sysprep --generalize a Windows instance, before making an image from it, yes?

Regarding OpenStack, could you tell us what glance and cinder drivers you use?

Have you done other volume to image before?

Have you verified that the image finishes creating before trying to create a VM from it?

I'm not sure that snapshotting before creating an image is necessary.  It's a good idea (maybe even necessary) to have the instance off when converting a volume to an image, thus, depending on your storage technology, the image might just be a snapshot.

I've done volume to image before, but it's been a little while.  I plan to do this with a Linux instance today, so I'll see if I can do it while the instance is running.

Thank you,

Dominic L. Hilsbos, MBA
Vice President – Information Technology
Perform Air International Inc.
DHilsbos at

From: Franck VEDEL [mailto:franck.vedel at] 
Sent: Wednesday, October 13, 2021 12:58 AM
To: openstack-discuss
Subject: Problème with image from snapshot

Hello and first sorry for my english… thanks google.

Something is wrong with what I want to do:
I use Wallaby, it works very well (apart from VpnaaS, I wasted too much time this summer to make it work, without success, and the bug does not seem to be fixed).

Here is what I want to do and which does not work as I want:
- With an admin account, I launch a Win10 instance from the image I created. The instance is working but it takes about 10 minutes to get Win10 up and running.
I wanted to take a snapshot of this instance and then create a new image from this snapshot. And that users use this new image.
I create the snapshot, I place the "--public" parameter on the new image.
I'm trying to create a new instance from this snapshot with the admin account: it works.
I create a new user, who has his project, and sees all the images. I try to create an instance with this new image and I get the message:

Block Device Mapping is Invalid: failed to get snapshot f12c04f2-51e7-4817-ab9b-eda63c5b9aff. (HTTP 400) (Request-ID: req-c26dab86-c25f-409a-8390-8aa0ea8fe1cb)

Is it a legal problem? Is it possible to do as I do? otherwise how should we do it?

Thanks if you have ideas for helping me

Franck VEDEL

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