[lxc-users] lxc progress and a few questions

[Tycho Andersen]

On Mon, Mar 28, 2016 at 08:47:24PM -0700, jjs - mainphrame wrote:
> I've looked at ct migration between 2 ubuntu 16.04 hosts today, and had
> some interesting problems;  I find that migration of stopped containers
> works fairly reliably; but live migration, well, it transfers a lot of
> data, then exits with a failure message. I can then move the same
> container, stopped, with no problem.
> 
> The error is the same every time, a failure of "mkdtemp" -

It looks like your host /tmp isn't writable by the uid map that the
container is being restored as?

> 
> root at ronnie:~# lxc move third lxd:
> error: Error transferring container data: restore failed:
> (00.033172)      1: Error (cr-restore.c:1489): mkdtemp failed
> crtools-proc.x9p5OH: Permission denied
> (00.060072) Error (cr-restore.c:1352): 9188 killed by signal 9
> (00.117126) Error (cr-restore.c:2182): Restoring FAILED.
> 
> root at raskolnikov:~# lxc move third lxd2:
> error: Error transferring container data: restore failed:
> (00.039099)      1: Error (cr-restore.c:1489): mkdtemp failed
> crtools-proc.a3U2t5: Permission denied
> (00.063015) Error (cr-restore.c:1352): 1771 killed by signal 9
> (00.115261) Error (cr-restore.c:2182): Restoring FAILED.
> 
> root at ronnie:~# lxc move third lxd:
> error: Error transferring container data: restore failed:
> (00.034542)      1: Error (cr-restore.c:1489): mkdtemp failed
> crtools-proc.gee5YS: Permission denied
> (00.059955) Error (cr-restore.c:1352): 9274 killed by signal 9
> (00.109272) Error (cr-restore.c:2182): Restoring FAILED.
> 
> 
> Thanks for any pointers you can provide -
> 
> PS  - on a side note, I'd originally set up the new box with a separate
> /var partition on btrfs. As a result, "criu check" would die instantly with
> a segmentation error. After putting /var back on / (ext4) criu check
> produces the message "Looks good."

Hmm. Can you get the backtrace?

Tycho

> Jake
> 
> 
> 
> On Mon, Mar 28, 2016 at 7:47 AM, Tycho Andersen <
> tycho.andersen at canonical.com> wrote:
> 
> > On Sun, Mar 27, 2016 at 09:22:44PM -0700, jjs - mainphrame wrote:
> > > You've had some success with live migrations? At any rate, I'm upgrading
> > my
> > > ubuntu 15.10 test box to 16.04 so that I'll have 2 of them. I'll give it
> > a
> > > whirl.
> >
> > Yes, there are still various unsupported kernel features, but it
> > should work out of the box for a modern stock xenial image on a xenial
> > host. There is one more xenial kernel patch which will eventually be
> > released that will break things, but I'm in the process of upstreaming
> > some CRIU patches to handle that case, and we'll distro patch those
> > when they're ready.
> >
> > Tycho
> >
> > > On Sun, Mar 27, 2016 at 9:20 PM, Fajar A. Nugraha <list at fajar.net>
> > wrote:
> > >
> > > > On Sun, Mar 27, 2016 at 11:31 PM, jjs - mainphrame <jjs at mainphrame.com
> > >
> > > > wrote:
> > > > > The 2nd link you sent seems to indicate that
> > > > > live migration wants to work, but I haven't been able to find any
> > reports
> > > > > from normal users in the field who've actually succeeded with live
> > > > > migration. if I've missed something, please let me know.
> > > >
> > > > My best advice is to try yourself with latest 16.04 daily.
> > > >
> > > > I've had both success and failure with it.
> > > >
> > > > --
> > > > Fajar
> > > > _______________________________________________
> > > > lxc-users mailing list
> > > > lxc-users at lists.linuxcontainers.org
> > > > http://lists.linuxcontainers.org/listinfo/lxc-users
> > > >
> >
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> >
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> >

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