[Openstack] What Exactly Flavor Work?

Bob Ball bob.ball at citrix.com
Wed Oct 9 14:32:34 UTC 2013

Yes, just to confirm the XenAPI driver will automatically resize disks where it can without needing an agent / cloud-init installed in the VM.

It does this by mounting the disk in the domain running nova and resizing the filesystem/device.


From: Joe Topjian [mailto:joe.topjian at cybera.ca]
Sent: 09 October 2013 14:52
To: Tom Fifield
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] What Exactly Flavor Work?

My understanding is that automatic resize will occur if the following are all true:
* auto_disk_config=True is set as a property on the image in the Image Registry.
* The disk on the image has only one partition.
* The file system on the one partition is ext3 or ext4.

I think Xen provides some extra help in this area by doing the resize itself (I *think*). KVM defers the job to the user.

There was a long discussion on the openstack-operators list about building CentOS images:


The td;dr version would be this post where I link to some scripts that are able to build a complete CentOS image that resizes as you would expect:


Hope that helps,

Joe Topjian
Systems Architect
Cybera Inc.


Cybera is a not-for-profit organization that works to spur and support innovation, for the economic benefit of Alberta, through the use of cyberinfrastructure.
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