[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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
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

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

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
   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

You might need something like:

export PYTHONPATH=$PYTHONPATH:/usr/lib/xen-4.8/lib/python/

But I'm no expert on Python.


Sure, I hadn't use PYTHONPATH until now but I can try this and see if it works on next upgrade!




Dr. Alessandro Tugnoli

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

Phone: +39 051 639 8035
Fax:   +39 051 639 8130
Email: a.tugnoli@xxxxxxxxxxxxxx

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.