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On Tue, Sep 27, 2016 at 10:40:34AM -0600, Chris Friesen wrote:
> On 09/27/2016 10:17 AM, Matthew Booth wrote:
> 
> > I think we should be able to create a domain, but once created we should never
> > redefine a domain. We can do adding and removing devices dynamically using
> > libvirt's apis, secure in the knowledge that libvirt will persist this for us.
> > When we upgrade the host, libvirt can ensure we don't break guests which are on
> > it. Evacuate should be pretty much the only reason to start again.
> 
> Sounds interesting.  How would you handle live migration?
> 
> Currently we regenerate the XML file on the destination from the nova DB.  I
> guess in your proposal we'd need some way of copying the XML file from the
> source to the dest, and then modifying the appropriate segments to adjust
> things like CPU/NUMA pinning?

Use the flag VIR_MIGRATE_PERSIST_XML and libvirt will write out the
new persistent XML on the target host automatically.

Regards,
Daniel
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