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["Day, Phil" <philip.day@xxxxxx>]

Hi Christian,

For a more general solution you might want to look at the code that supports passing in "-availabilty_zone=az:host" (look for forced_host in compute/api.py).  Currently this is limited to admin, but I think that should be changed to be a specific action that can be controlled by policy (we have a change in preparation for this).

Cheers,
Phil

From: openstack-bounces+philip.day=hp.com@xxxxxxxxxxxxxxxxxxx [mailto:openstack-bounces+philip.day=hp.com@xxxxxxxxxxxxxxxxxxx] On Behalf Of GMI M
Sent: 16 October 2012 15:13
To: Christian Parpart
Cc: <openstack@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts

Hi Christian,

I think you might be able to use the existing filters in Essex.
For example, you can add the following lines in the nova.conf of the controller host (or where nova-scheduler runs) and restart nova-scheduler:

isolated_hosts="nova7"
isolated_images="sadsd1e35dfe63"

This will allow you to run the image with ID "sadsd1e35dfe63" only on the compute host "nova7".
You can also pass a list of compute servers in the isolated_hosts, if you have the need.

I certainly see the use-case for this feature, for example when you want to run Windows based instances and you don't want to buy a Windows datacenter license for each nova-compute host, but only for a few that will run Windows instances.

I hope this helps you.




On Mon, Oct 15, 2012 at 7:45 PM, Christian Parpart <trapni@xxxxxxxxx<mailto:trapni@xxxxxxxxx>> wrote:
Hi all,

I am looking for a (Essex) Nova scheduler plugin that parses the scheduler_hints to get a hostname of the
hypervisor to spawn the actual VM on, rejecting any other node.

This allows us to explicitely spawn a VM on a certain host (yes, there are really usecases where you want that). :-)

I was trying to build my own and searching around since I couldn't believe I was the only one, but didn't find one yet.

Does anyone of you maybe have the skills to actually write that simple plugin, or even maybe knows where such
a plugin has already been developed?

Many thanks in advance,
Christian Parpart.

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