On 06/07/2012 03:04 AM, Osier Yang wrote: > I once thought the RFE is not a valid request from a command p.o.v > (if we provide too much options for the various config tags, it's > just duplicate work of tools like virt-install, and somehow it's > even not better than XML), but now IMHO it'd be wonderful if we > have the best default configuration template for each driver. And > if so, using the templates to implement the command will make sense. The idea of templates has merit. I could see it being similar to how we have <nwfilter> and even <network> as templates, where a <domain> can refer to one of these other entities by name instead of calling out the details itself. That is, we would add a new virDomainTemplatePtr, whose XML is a subset of <domain> XML, then you could write a domain that uses <domain template='xyz'>...</domain> which picks up defaults from template xyz instead of the current default of omitting anything not specified. A template could specify typical memory usage, things such as default disk policy (cache='writethrough' vs. cache='none', use of virtio, and so forth), a default graphics device (spice vs. vnc setup, or serial console only), existence of the plumbing for a guest agent, and so forth. I could also see libosinfo providing a set of templates for use in conjunction with various guest OS, even having such things as a template tuned for a guest acting as a mail hub vs. a different template tuned for a guest acting as a database server, or a template that knows Windows and Linux support a guest agent vs. a guest that lacks an agent. But it sounds like quite a bit of work, and it's not at the top of my personal to-do list (since I have a lot on my plate for improving snapshot and storage volume management). I'm more throwing the idea out there in the hopes that someone else will be able to take and run with it (I will gladly review patches, though!) -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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