[CRIU] system configuration for dumping/restoring LXC

[Tycho Andersen]

On Fri, Sep 12, 2014 at 12:24:07AM +0000, Zmudzinski, Krystof C wrote:
> root at se:~/criu-1ff2500# ./criu check
> Error (timerfd.c:56): timerfd: No timerfd support for c/r: Inappropriate ioctl for device
> Error (cr-check.c:269): fdinfo doesn't contain the mnt_id field
> 
> root at se:~/criu-1ff2500# ./criu check --ms
> Warn  (tun.c:55): Skipping tun support check
> Warn  (timerfd.c:44): timerfd: Skipping timerfd support check
> Warn  (cr-check.c:260): Skipping mnt_id support check
> Looks good.

Hmm, that looks ok. I'm not sure what the netlink error means. Maybe
someone else knows?

I would encourage you to use the lxc development tree, though, as I've
already worked through several other issues in the development of
lxc-checkpoint.

Tycho

> Krystof
> 
> -----Original Message-----
> From: Tycho Andersen [mailto:tycho.andersen at canonical.com] 
> Sent: Thursday, September 11, 2014 5:06 PM
> To: Zmudzinski, Krystof C
> Cc: Andrew Vagin; criu at openvz.org; Andrey Wagin
> Subject: Re: [CRIU] system configuration for dumping/restoring LXC
> 
> Hi Krystof,
> 
> On Thu, Sep 11, 2014 at 11:29:44PM +0000, Zmudzinski, Krystof C wrote:
> > I downloaded and built (after fixing two warnings) 1ff2500 but restore fails.  Log attached.
> 
> Yes, I submitted a patch for those too, it is on the ML.
> 
> What does the output of 'criu check' show?
> 
> Tycho
> 
> > Krystof
> > 
> > -----Original Message-----
> > From: criu-bounces at openvz.org [mailto:criu-bounces at openvz.org] On 
> > Behalf Of Zmudzinski, Krystof C
> > Sent: Thursday, September 11, 2014 3:34 PM
> > To: Tycho Andersen; Andrew Vagin
> > Cc: criu at openvz.org; Andrey Wagin
> > Subject: Re: [CRIU] system configuration for dumping/restoring LXC
> > 
> > Guys,
> > 
> > I'm willing to try all these options but I have to first switch to my work e-mail; per some internal rules I can't use my private e-mail for work related communications.
> > 
> > Krystof
> > 
> > -----Original Message-----
> > From: criu-bounces at openvz.org [mailto:criu-bounces at openvz.org] On 
> > Behalf Of Tycho Andersen
> > Sent: Thursday, September 11, 2014 3:29 PM
> > To: Andrew Vagin
> > Cc: criu at openvz.org; Andrey Wagin
> > Subject: Re: [CRIU] system configuration for dumping/restoring LXC
> > 
> > Hi Andrew, Krystof,
> > 
> > On Fri, Sep 12, 2014 at 12:31:59AM +0400, Andrew Vagin wrote:
> > > On Thu, Sep 11, 2014 at 10:50:45AM -0700, Krystof Zmudzinski wrote:
> > > > 22. This time I got: bridge br0 does not exist!
> > > > 23. I edited network-script.sh accordingly 24.  Dump doesn't work.  
> > > > See attached dump1.log.
> > > > 25. So I went back to the way I originally created the container.  
> > > > I changed rootfs in test-lxc.conf to /root/test-lxc 26. I created 
> > > > the container and started it and I was able to dump it; see 
> > > > attached dump2.log
> > > > 27 However, the restore hangs.  ps a shows these processes but 
> > > > there is no init; see attached restore.log
> > > 
> > > Welcome to the club:
> > > http://lists.openvz.org/pipermail/criu/2014-September/016190.html
> > 
> > My patch to fix this deadlock is in criu master now (1ff2500b9), so you need to use that hash or later to work around this.
> > 
> > > I will write tomorrow, what we will need for investigating this problem.
> > > 
> > > Tycho, could you read the previous email from Krystof? I think you 
> > > have more experience of dumping LXC containers.
> > 
> > If you can use a development version of lxc, there are is an lxc-checkpoint command there that should invoke criu for you. You can use it like this:
> > 
> > # dump
> > lxc-checkpoint -v -s -D /tmp/checkpoint -n $name
> > 
> > # wait for the monitor to die
> > lxc-wait -n $name -s STOPPED
> > 
> > # restore
> > lxc-checkpoint -r -v -D /tmp/checkpoint -n u1
> > 
> > Tycho
> > 
> > > Thanks,
> > > Andrew
> > > 
> > > > 
> > > >   413 pts/1    S+     0:00 /bin/bash ./run.sh test-lxc
> > > >   498 pts/1    S+     0:00 /root/criu-1.3/criu restore --evasive-devices
> > > > --tcp-e
> > > >   499 pts/1    t+     0:00 /root/criu-1.3/criu restore --evasive-devices
> > > > --tcp-e
> > > > 
> > _______________________________________________
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> > 
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