On Fri, Mar 22, 2019 at 9:25 AM Rikimaru Honjo <honjo.rikimaru@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):

setUpClass (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.

Thanks

Alex.

Best regards,
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Rikimaru Honjo
E-mail:honjo.rikimaru@po.ntt-tx.co.jp

Alex Kavanagh - Software Engineer

OpenStack Engineering - Data Centre Development - Canonical Ltd