Re: [libvirt] [RFC] changing/regenerating domain uuid on migration
On Thu, Apr 21, 2016 at 11:24:11AM +0300, Nikolay Shirokovskiy wrote:
Hi all.
Consider next usecase. There are active domain DA on host A and active domain
DB on host B and the uuids of domains are the same. This is quite uncommon of
course but still possible. If we have option to change uuid on migration
then migration of DA to host B is possible and if we don't have the option
we have to stop/edit/start DA to migrate.
What is you opinion on subject? Can this functionality be taken into upstream
and in what form? In form of setting uuid as a migration parameter or option to
regenerate uuid on destination?
I don't have a particular opinion on this. I think other generated
stuff could break, e.g. those domains could have the same MAC address
etc. I know it's not someone cares about in this case, but there are
few things to keep in mind. We were discussing something similar in
other threads here about multiplying domains. I wonder, though, if you
can change the name (using 'dname' for virsh), why wouldn't you be able
to change the uuid (e.g. with --xml) already? We could have just a
'--i-know-what-i-am-doing' kind of flag, like we have that '--unsafe'
one already.
Nikolay
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