[CRIU] Unable to checkpoint LXC container

[Ross Boucher]

Thanks for the fast reply, and the dump.log hint. (Here's the file, for
reference[1]). Looks like it's a mount issue. I'll follow up on the
lxc-users mailing list if I can't make progress.


[1] http://pastebin.com/xFpfrk2U

On Mon, Mar 30, 2015 at 3:02 PM, Tycho Andersen <
tycho.andersen at canonical.com> wrote:

> Hi Ross,
>
> On Mon, Mar 30, 2015 at 02:15:06PM -0700, Ross Boucher wrote:
> > Apologies in advance if I'm asking in the wrong place. I'm trying to
> follow
> > the LXC setup instructions
> > from the wiki[1] and not having any luck. When I get to the actual
> > checkpoint step, it fails with this output:
>
> I think this is probably best continued on the lxc-users ML, but some
> thoughts are below.
>
> >     vagrant at vagrant: $ sudo lxc-checkpoint -D /tmp -v -n u1
> >     Checkpointing u1 failed.
> >
> > I haven't been able to get any other information by setting the log level
> > or adding the verbose flag.
>
> There should be a file called dump.log which tells you the error.
> However, with current trunk LXC there are some known issues. I've
> posted patches for those that need to be merged, but once those land
> you may have better luck. (There are still many caveats, one is that
> containers using lxcfs are not supported.)
>
> > Running 'criu check --ms' gives me the following output:
> >
> >     Warn  (cr-check.c:188): Skipping unssuported PR_SET_MM_MAP
> >     Warn  (tun.c:58): Skipping tun support check
> >     Warn  (timerfd.c:44): timerfd: Skipping timerfd support check
> >     Warn  (cr-check.c:296): Skipping mnt_id support check
> >     Warn  (cr-check.c:668): Skipping unsupported AIO remap
> >     Looks good.
> >
> > I compiled criu from source, but haven't compiled a custom kernel, which
> I
> > believe is what's causing the
> > warnings? Checking my kernel configuration, the flags seem to match what
> is
> > asked for on the wiki[2].
> > I was able to get a really simple process checkpointed, following these
> > instructions[3].
>
> What kernel version are you using, from what OS?
>
> Tycho
>
> > Any pointers on where to look would be appreciated, thanks.
> >
> > - Ross
> >
> > [1] http://criu.org/LXC
> > [2] http://criu.org/Installation
> > [3] http://criu.org/Simple_loop
>
> > _______________________________________________
> > CRIU mailing list
> > CRIU at openvz.org
> > https://lists.openvz.org/mailman/listinfo/criu
>
>
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