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Re: [Qemu-devel] [libvirt] [qemu-devel] Default machine type setting for

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [libvirt] [qemu-devel] Default machine type setting for ppc64
Date: Tue, 21 May 2013 18:42:25 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, May 21, 2013 at 11:12:26AM -0600, Eric Blake wrote:
> On 05/21/2013 10:42 AM, Anthony Liguori wrote:
> > Perhaps the right thing to do for OpenStack is to allow for a user
> > specified configuration file to select things like the default hardware
> > models/machine types?  Then this could become node configuration instead
> > of dynamic configuration.
> > 
> > I think it could be useful for general users too.  Every domain requires
> > a lot of the same boiler plate bits.  I think a lot of configurations
> > would benefit from being able to set global domain options.
> I have also argued in the past that it would be useful for libvirt to
> support the idea of a template, where you can specify a domain XML that
> inherits defaults from the template.  We've already done things like
> this for networking, nwfilter, and even secret management (in domain
> XML, you declare that you are using a named network object, and that
> network object serves as the template instead of you having to hard-code
> all the elements into your domain XML), so we have a design to base it
> on.  But until someone adds such a feature for libvirt, then OpenStack
> should be passing explicit XML to libvirt, and tracking defaults at the
> OpenStack layer.

I don't think the idea of a template belongs in libvirt. Creating basic
XML structure with relevant defaults pre-filled for a particular usecase
is something that the libvirt-designer library is aiming to take care of
for applications.

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