Open Stack

The idea I like is to unify the migrate and live-migrate APIs. Currently the migrate is scheduled and live-migrate is direct to the host.

A single migrate call could be scheduled by default, accepting hints for a specific host or zone, with the option to be live or not-live and with or without block migration.

While resize is very related to migrate, it seems best to keep the more user focused operation separate, but ensuring you can do the scheduler hint would seem reasonable.

Does anyone have any plans to start work on this?

John

From: openstack-bounces+john.garbutt=citrix.com at lists.launchpad.net [mailto:openstack-bounces+john.garbutt=citrix.com at lists.launchpad.net] On Behalf Of Razique Mahroua
Sent: 08 January 2013 10:06
To: Stephen Gran
Cc: openstack at lists.launchpad.net (openstack at lists.launchpad.net)
Subject: Re: [Openstack] [Openstack-operators] A concept feature named 'scheduling live migration'

Nice approach Stephen, thanks for the hint.

Razique Mahroua - Nuage & Co
razique.mahroua at gmail.com<mailto:razique.mahroua at gmail.com>
Tel : +33 9 72 37 94 15

[cid:image001.jpg at 01CDED9B.9866F350]

Le 8 janv. 2013 à 11:03, Stephen Gran <stephen.gran at guardian.co.uk<mailto:stephen.gran at guardian.co.uk>> a écrit :


Hi,

Yes, this is in my mind.  I see it as being in two parts:

First, there needs to be a scheduler hint and filter so that the
scheduler knows not to schedule more VMs for the host in maintenance
mode.

Second, there needs to be a way to ask the scheduler 'where would you
put this VM if you were asked to do so' without making the scheduler
actually schedule a VM creation, then use that information for live
migration destination selection.

Both of these look relatively straightforward, but they both need
doing :)

Cheers,

On Tue, 2013-01-08 at 10:49 +0100, Razique Mahroua wrote:

Hey,
this is not a feature I'm aware of at the moment. But I think you can
do that by iterating on the instance. The command
nova show $instance_id will give you the host the instance is running
on. You can use it to loop on a migration process. You can also use a
mysql request in order to retrieve all the instances running on that
node

OS-EXT-SRV-ATTR:host   X
Razique Mahroua - Nuage & Co
razique.mahroua at gmail.com<mailto:razique.mahroua at gmail.com>
Tel : +33 9 72 37 94 15



Le 8 janv. 2013 à 03:56, "Yuan, Ye A" <ye.a.yuan at intel.com<mailto:ye.a.yuan at intel.com>> a écrit :


Yep, it seems that our purposes are maintenance/test both.
BTW, if one admin/oprator want to maintenance a host, he/she may
want to relocate  all instance to another health node.
If there is a command just like  'nova live-migrate --all' and
he/she need not care about selecting which node as destination, all
works will be done by nova-scheduler.

Best wishes,
Yale Yuan

From: Razique Mahroua [mailto:razique.mahroua at gmail.com]
Sent: Monday, January 07, 2013 4:56 PM
To: Yuan, Ye A
Cc: openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>
Subject: Re: [Openstack-operators] A concept feature named
'scheduling live migration'

Hi Yuan ,
would it be similar somehow to the feature which allows you to
disable a service via keystone on a server?
see : https://bugs.launchpad.net/keystone/+bug/1048662

Razique Mahroua - Nuage & Co
razique.mahroua at gmail.com<mailto:razique.mahroua at gmail.com>
Tel : +33 9 72 37 94 15

<image001.jpg>

Le 7 janv. 2013 à 09:01, "Yuan, Ye A" <ye.a.yuan at intel.com<mailto:ye.a.yuan at intel.com>> a
écrit :



Hi all,
There is a feature in my mind just as below:
In VMware, admin can use maintenance mode to set a host to entering
maintenance mode, in which the host does not allow you to deploy or
power on a virtual machine until all running virtual machines are
powered down or migrated to different hosts.
So, if there is a feature that enable scheduler while live migration
rather than use destination hostname argument in shell command 'nova
live-migration <instance-uuid> <hostname>', OpenStack can implement
maintenance mode too. In other words, operator can migrate instance
without specific destination hostname.
If anyone has some suggestions, please feel free to let me know.

Best wishes,
Yale Yuan

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