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.

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