[Openstack] Migrate instances/tenants between clouds

Joshua Harlow harlowja at yahoo-inc.com
Thu Oct 24 20:56:12 UTC 2013

I agree its not simple (from experience),

There is a difference though between 'simpler for now' and the 'right thing to do',

If software doesn't support the right thing to do ('upgrade', 'dist-upgrade' - or yum equivalent) then the community needs to make that work (and stop with new features).

Otherwise the community is in a whole world of trouble. If openstack is to make the life of operations & other people  better and the only way to operate it is to build new regions, then something feels backwards in this equation.

IMHO bypassing the problem is not a long-term solution (and is not healthy for openstack to even recommend this).

I don't even think its a short-term solution honestly since building a new region costs $$ and downtime. Who wants to do that every 6 months, I can surely tell u I don't :)

From: Martinx - ジェームズ <thiagocmartinsc at gmail.com<mailto:thiagocmartinsc at gmail.com>>
Date: Thursday, October 24, 2013 1:17 PM
To: Joshua Harlow <harlowja at yahoo-inc.com<mailto:harlowja at yahoo-inc.com>>
Cc: Tim Bell <Tim.Bell at cern.ch<mailto:Tim.Bell at cern.ch>>, Alexander Stellwag <openstack at stellwag.net<mailto:openstack at stellwag.net>>, "openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>" <openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>>
Subject: Re: [Openstack] Migrate instances/tenants between clouds

I do not even want to try to upgrade my system...

I know that DPKG is awesome and handle system upgrades carefully but, sounds more simpler to just build a new Region...

This doesn't sound trivial (like `apt-get update ; apt-get dist-upgrade`):


Don't you think!?

On 24 October 2013 17:48, Joshua Harlow <harlowja at yahoo-inc.com<mailto:harlowja at yahoo-inc.com>> wrote:
Whatever happened to doing in-place upgrades?

Has that been problematic for u, are people just not doing it? If they are
avoiding it, why?

Shouldn't just going from folsom->havana work, if not, why not; it worries
me that this isn't priority #0 if it doesn't work.

On 10/24/13 10:51 AM, "Tim Bell" <Tim.Bell at cern.ch<mailto:Tim.Bell at cern.ch>> wrote:

>Have you tried
>- snapshot
>- glance download of the snapshot
>- glance upload of the snapshot to new instance
>- boot from snapshot
>The process we use at CERN is documented at
>This could be a good technique to document in the standard CERN openstack
>user guide.
>BTW, this does increase the storage in your glance server since you'll
>loose any commonality between multiple images. So, make sure you've lots
>of space on Glance.
>> -----Original Message-----
>> From: Alexander Stellwag [mailto:openstack at stellwag.net<mailto:openstack at stellwag.net>]
>> Sent: 24 October 2013 16:53
>> To: openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>
>> Subject: [Openstack] Migrate instances/tenants between clouds
>> Hi stackers,
>> we're looking for a tool / script / blueprint to migrate instances or
>>even complete tenants between multiple installations of OpenStack
>> (possibly running different versions).
>> I searched around the net but didn't find anything appropriate. Is any
>>of you aware of such a tool?
>> The current use-case is a migration from a folsom/nova-network based
>>installation into our new havana/neutron based cloud. It is not
>> necessary to migrate instances and volumes online but it should work at
>>least semi-automatically to make it usable in large deployments.
>> Any hints would be greatly appreciated.
>> Cheers,
>> Alex
>> --
>> Alexander Stellwag
>> Deutsche Telekom AG Products & Innovation Infrastructure Design
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