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The instance path is assumed to be the same everywhere. When using libvirt to do cold migration/resize the source host creates the instance directory on the target host using ssh and then copies the files to it using scp. So the target host doesn’t even get to determine where its own files are created. (note: this is one of the security flaws we intend to remove in the libvirt storage pools work).


From: Michael Still [mailto:mikal at stillhq.com]
Sent: 04 May 2016 06:16
To: OpenStack Development Mailing List (not for usage questions) <openstack-dev at lists.openstack.org>
Subject: Re: [openstack-dev] [nova] Should be instance_dir in all nova compute node same ?

I can't think of a reason. In fact its a bit warty because we've changed the way we name the instance directories at least once. Its just how this code was written back in the day.

Cleaning this up would be a fair bit of work though. Is it really worth the effort just so people can have different directory names for some undefined reason?

Michael



On Wed, May 4, 2016 at 9:03 AM, Ghe Rivero <ghe.rivero at gmail.com<mailto:ghe.rivero at gmail.com>> wrote:
Is there any specific reason why this is require that way? or just a "feature"?

Ghe Rivero

On 03/05/16 11:42, Matthew Booth wrote:
On Fri, Apr 29, 2016 at 2:47 AM, Eli Qiao <liyong.qiao at intel.com<mailto:liyong.qiao at intel.com>> wrote:
hi team,

Is there any require that all compute node's instance_dir should be same?

Yes. This is assumed in many places, certainly in cold migration/resize.

Matt
--
Matthew Booth
Red Hat Engineering, Virtualisation Team

Phone: +442070094448<tel:%2B442070094448> (UK)



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