[CRIU] Unable to checkpoint LXC container

[Tycho Andersen]

On Mon, Mar 30, 2015 at 04:18:16PM -0700, Ross Boucher wrote:
> 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.

Yep, try that (and my other) patch on the LXC mailing list. If you
build from source with those patches, it should work.

Tycho

> 
> [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
> >
> >