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Re: [Libvir] [PATCH 1/2] virDomainMigrate implementation (Xen only, no remote, no qemu, no virsh)



On Mon, Jul 16, 2007 at 04:56:53PM +0100, Richard W.M. Jones wrote:
> Dan Berrange wrote:
> >I don't see the point in this. Libvirt already knows both hostnames
> >of the source & destination.
> 
> It's really very hard for libvirt to accurately determine the hostname 
> of the destination as seen from the source.  Consider the case where you 
> have a multi-homed host with a generic hostname (eg. 
> "localhost.localdomain" which for some reason is the default on all my 
> F7 installs).  If you have a specific suggestion for how to solve this, 
> I'd like to hear it.

Nope don't have any magic solution offhand. I know its very hard, but
punting this problem off to the end user isn't too nice either. Since
we've already asked them for 2 hostnames when connecting to the source
and destination nodes they would not unreasonably expect to be able
to migrate without entering yet more hostnames.  

> >Probably need one of the 'flags' to indicate whether to do live vs offline
> >migration.
> 
> I didn't really understand this.  Isn't live vs. offline mutually exclusive?

Yes, they're exclusive - you either live migrate, or your offline migrate.
I just meant we need some way to express this in the API - or do we just
go for always live migrating. I wouldn't have a problem with only doing live
migrate, unless someone knows of a compelling reason to require offline
migration too.

Dan.
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