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. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|