openstack team mailing list archive

[Stephen Gran <stephen.gran@xxxxxxxxxxxxxx>]

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@xxxxxxxxx
> Tel : +33 9 72 37 94 15
> 
> 
> 
> Le 8 janv. 2013 à 03:56, "Yuan, Ye A" <ye.a.yuan@xxxxxxxxx> 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@xxxxxxxxx] 
> > Sent: Monday, January 07, 2013 4:56 PM
> > To: Yuan, Ye A
> > Cc: openstack-operators@xxxxxxxxxxxxxxxxxxx
> > 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@xxxxxxxxx
> > Tel : +33 9 72 37 94 15
> > 
> > <image001.jpg>
> >  
> > Le 7 janv. 2013 à 09:01, "Yuan, Ye A" <ye.a.yuan@xxxxxxxxx> 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
> >  
> > _______________________________________________
> > OpenStack-operators mailing list
> > OpenStack-operators@xxxxxxxxxxxxxxxxxxx
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
> 
> 
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-- 
Stephen Gran
Senior Systems Integrator - guardian.co.uk

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