------- Comment From [email protected] 2016-09-27 09:31 EDT-------
Posting the comment as public:
---
I tested the scenarios is latest Ubuntu1610 host with 4.8.0-17 kernel along
with patch given by canonical
in comment #19
# uname -a
Linux powerkvm4-lp1 4.8.0-17-generic #19-Ubuntu SMP Sun Sep 25 06:35:40 UTC
2016 ppc64le ppc64le ppc64le GNU/Linux
# dpkg --list | grep libvirt
ii gir1.2-libvirt-glib-1.0:ppc64el 0.2.3-2
ppc64el GObject introspection files for the libvirt-glib library
ii gir1.2-libvirt-sandbox-1.0 0.5.1+git20151113-3
ppc64el GObject introspection files for the libvirt-sandbox library
ii libvirt-bin 2.1.0-1ubuntu7~ppa1
ppc64el programs for the libvirt library
ii libvirt-clients 2.1.0-1ubuntu7~ppa1
ppc64el Programs for the libvirt library
ii libvirt-daemon 2.1.0-1ubuntu7~ppa1
ppc64el Virtualization daemon
ii libvirt-daemon-system 2.1.0-1ubuntu7~ppa1
ppc64el Libvirt daemon configuration files
ii libvirt-dev:ppc64el 2.1.0-1ubuntu7~ppa1
ppc64el development files for the libvirt library
ii libvirt-doc 2.1.0-1ubuntu7~ppa1 all
documentation for the libvirt library
ii libvirt-glib-1.0-0:ppc64el 0.2.3-2
ppc64el libvirt GLib and GObject mapping library
ii libvirt-glib-1.0-dev:ppc64el 0.2.3-2
ppc64el Development files for the libvirt-glib library
ii libvirt-ocaml 0.6.1.2-1build2
ppc64el OCaml bindings for libvirt
ii libvirt-ocaml-dev 0.6.1.2-1build2
ppc64el OCaml bindings for libvirt
ii libvirt-sandbox-1.0-5 0.5.1+git20151113-3
ppc64el Application sandbox toolkit shared library
ii libvirt-sandbox-1.0-dev 0.5.1+git20151113-3
ppc64el Development files for libvirt-sandbox library
ii libvirt-sanlock 2.1.0-1ubuntu7~ppa1
ppc64el Sanlock plugin for virtlockd
ii libvirt0:ppc64el 2.1.0-1ubuntu7~ppa1
ppc64el library for interfacing with different virtualization systems
ii munin-libvirt-plugins 0.0.6-1 all
Munin plugins using libvirt
ii python-libvirt
Observation:
1. Issue is observed when migration is done twice
a. I migrated guest(Ubuntu1610) 1st time successfully,
# time virsh migrate avocado-vt-vm1 qemu+ssh://9.47.68.198/system --verbose
--postcopy-after-precopy --postcopy --live
Migration: [100 %]
real 0m57.423s
user 0m0.056s
sys 0m0.012s
b. But when I tried for 2nd time
- Clean the guest in destination
- Start the guest in the source
- Perform migration using same migration command with guest(no workloads in
guest) it din't end for 47min
so I killed it.
# time virsh migrate avocado-vt-vm1 qemu+ssh://9.47.70.201/system --verbose
--postcopy-after-precopy --postcopy --live
Migration: [ 99 %]^CKilled
real 47m26.380s
user 0m0.380s
sys 0m0.508s
Attaching libvirt debug logs with it (libvirt_debug.7z)
I tried to reproduce the issue, libvirtd service can be restarted and same
experiment can be tried again and issue
gets hit.
Also I observe VM in the destination is still in paused state at 99% as
--postcopy-after-precopy should trigger
postcopy migration after first pass of pre-copy and VM should be running in
destination. So it looks like
postcopy migration is not working in this case.
2. --postcopy and "virsh migrate-postcopy avocado-vt-vm1" working as expected,
guest is running live in destination once
virsh migrate-postcopy avocado-vt-vm1 is given from another virsh instance
# time virsh migrate --live --postcopy avocado-vt-vm1
qemu+ssh://9.47.68.198/system --verbose
Migration: [100 %]
real 0m58.125s
user 0m0.056s
sys 0m0.016s
3. Error message is not thrown as well as postcopy migration is not performed,
# virsh migrate --live --postcopy-after-precopy avocado-vt-vm1
qemu+ssh://9.47.68.198/system
Expected - error message should be thrown if --postcopy flag is not used
4. Error message is not thrown as well as postcopy migration is not
performed,
# virsh migrate --postcopy-after-precopy avocado-vt-vm1
qemu+ssh://9.47.68.198/system
Expected - error message should be thrown if --live flag is not used
5. Fails gracefully with proper error,
# virsh migrate avocado-vt-vm1 qemu+ssh://9.47.68.198/system --verbose
--postcopy-after-precopy --postcopy
error: argument unsupported: post-copy migration is not supported with non-live
or paused migration
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1620906
Title:
[Ubuntu1610][Libvirt] Postcopy migration with --postcopy-after-precopy
option is not working as expected
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