[dev][nova-lxd]Can you do live-migration with nova-lxd?

Alex Kavanagh alex.kavanagh at canonical.com
Tue Mar 26 15:33:12 UTC 2019


On Fri, Mar 22, 2019 at 9:25 AM Rikimaru Honjo <
honjo.rikimaru at po.ntt-tx.co.jp> wrote:

> Hello,
> I'm using the nova-lxd with the latest nova.
> In my understanding, nova-lxd already supports live-migration. But,it
> didn't work
> when I tried it. Is there anyone who can do live-migration with nova-lxd?

I'm currently one of the maintainers of nova-lxd and I don't think that it
supports live migration.  I'm fairly certain migration is broken (
https://bugs.launchpad.net/nova-lxd/+bug/1818078) as it didn't work for me
when I was testing.  Live migration appears to be disabled in the tempest
testing (legacy-tempest-dsvm-lxd-ovs test):

(tempest.api.compute.admin.test_live_migration.LiveMigrationTest) ...
SKIPPED: LiveMigrationTest skipped as live-migration is not available

> I think that the root cause is that the LXDLiveMigrateData object is not
> registered with nova-condcutor & compute.

I say "don't think it supports live migration" because I became a
maintainer after that functionality appeared to be implemented; but I'm not
entirely sure the work is complete (i.e. it returns an object that doesn't
function with Nova as your mail indicates).  Whether it's because nova
changed and nova-lxd didn't notice (quite likely!) or it never worked
properly, I don't know, sadly.

> I wrote more information as a comment#2 in the following bug report.
> https://bugs.launchpad.net/nova-lxd/+bug/1711568

Thanks, I'll reference it in the bug I raised, too.  In terms of getting it
sorted out, it's not going to happen before the stein release, but I do
want to get to it at the beginning of the next cycle.


> Best regards,
> --
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> Rikimaru Honjo
> E-mail:honjo.rikimaru at po.ntt-tx.co.jp

Alex Kavanagh - Software Engineer
OpenStack Engineering - Data Centre Development - Canonical Ltd
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