Re: [Xen-users] domU migration from Xen 4.8 HyperVisor to Xen 4.4

[Alessandro Tugnoli <a.tugnoli@xxxxxxxxxxxxxx>]

Il 20/08/2018 13:04, Roger Pau Monné ha scritto:
> On Mon, Aug 20, 2018 at 12:17:46PM +0200, Alessandro Tugnoli wrote:
> > Thank you, i supposed that.
> > I've asked about migration from older to newer version of hypervisor because
> > I'm doing an upgrade of my two Xen Hypervisor hosts from xen 4.4 to 4.8 by
> > moving all the VM on the other host before upgrade to avoid services
> > downtime.
> > So, to be clear, I started with both hosts with Xen 4.4 and some VM on host1
> > and some on host2, so I "live" moved all the VM of host1 to host2 then I've
> > upgraded host1 to xen 4.8  (of course host2 still have xen 4.4) and, after
> > upgrade I would to move back my VM on host1 in order to proceed to the
> > upgrade of host2 but I've encountered the problem of migration from older
> > version to a newer of Xen :(
> >
> > Hope this clarify
> >
> > So what's the best way to upgrade a cluster with 2 Xen Host without services
> > downtime ?
> If both hosts are using the same Xen version you should move
> everything to one host, update the now empty host, move all DomUs to
> the newly updated host and finally update the remaining host.
yes is what I've tried but the migration fails also from old->new and 
that was strange
(i can understand that the migration won't work from new to old of course)

So, by now I had shut down manually all my domUs, reactivated them on 
other host (thanks to drbd synchronization of course),
upgrade the server and activated them back again on the upgraded host!

> > thanks in advance
> > best regards
> > alex
> >
> >
> > Il 20/08/2018 10:57, Roger Pau Monné ha scritto:
> > > On Fri, Aug 17, 2018 at 03:24:03PM +0200, Alessandro Tugnoli wrote:
> > > > Hi all
> > > >
> > > > I've just upgraded my hypervisor (let be "host1") to Debian 9 "Stretch" with
> > > > Xen 4.8 (before upgrade I had Debian 8 "jessie" with Xen 4.4 Hypervisor) and
> > > > DRBD for High Availability
> > > >
> > > > Everithing works well and I'm able to run all my domU in the hypervisor just
> > > > updated but, when I try to migrate one domU to another Host (let be "host2",
> > > > that has Debian 8 Jessie and Xen 4.4 Hypervisor and of course DRBD for High
> > > > Availability)
> > > >
> > > > it gives me an error:
> > > >
> > > > host1# xl migrate domU host2
> > > >
> > > > usr/lib/xen-4.4/bin/xl: invalid option -- 't'
> > > > unknown global option
> > > > libxl: error: libxl_utils.c:508:libxl_read_exactly: file/stream truncated
> > > > reading banner from migration receiver stream
> > > > libxl: info: libxl_exec.c:118:libxl_report_child_exitstatus: migration
> > > > transport process [13772] exited with error status 2
> > > >
> > > >
> > > > If I try the migration from host2 to host1 I get instad:
> > > >
> > > > host2# xl migrate domU host1
> > > >
> > > > migration target: Ready to receive domain.
> > > > Saving to migration stream new xl format (info 0x0/0x0/1003)
> > > > Loading new save file <incoming migration stream> (new xl fmt info
> > > > 0x0/0x0/1003)
> > > >    Savefile contains xl domain config
> > > > Parsing config from <saved>
> > > > Traceback (most recent call last):
> > > >     File "/usr/lib/xen-4.8/bin/convert-legacy-stream", line 15, in <module>
> > > >       from xen.migration import legacy, public, libxc, libxl, xl
> > > > ImportError: No module named xen.migration
> Can you check that you have /usr/lib/xen-4.8/lib/python/ in your
> PYTHONPATH?
>
> You might need something like:
>
> export PYTHONPATH=$PYTHONPATH:/usr/lib/xen-4.8/lib/python/
>
> But I'm no expert on Python.
>
> Roger.
Sure, I hadn't use PYTHONPATH until now but I can try this and see if it 
works on next upgrade!
thanks

bye

alex


--
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Dr. Alessandro Tugnoli

ISMN - CNR Area della Ricerca di Bologna
via Gobetti, 101 - 40129 Bologna ITALY

Phone: +39 051 639 8035
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Email: a.tugnoli@xxxxxxxxxxxxxx
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