[CRIU] Restarting Process in an LXC Container

[Thouraya TH]

Hello,

I understand that i have to access the contenair with ssh for example (ssh
ubuntu@$(sudo lxc-info -n worker -H -i)), from the begining, before the
dumping process ?
instead of lxc-start ?

Thanks a lot for help.
Bests.

2015-01-20 12:43 GMT+01:00 Andrew Vagin <avagin at parallels.com>:

> On Mon, Jan 19, 2015 at 06:09:47PM +0100, Thouraya TH wrote:
> > Hello :) thanks a lot for help.
> >
> > How do you enter into CT? Do you use screen or ssh?
> >
> > Before the Dumping Process:
> >
> > root at g-2:~# lxc-ls -f
> > NAME     STATE    IPV4  IPV6  GROUPS  AUTOSTART
> > -----------------------------------------------
> > worker   STOPPED  -     -     -       NO
> > root at g-2:~# lxc-start -n worker
> > root at g-2:~# lxc-attach -n worker
>
> I've understood the problem and its causes. If you execute a process in
> CT, it lives in CT's pid namespaces, but it belongs to another process
> tree, becuase its parent is outside of the CT.
>
> Currently CRIU is able to dump only one process tree. I am not sure that
> we will fix this problem in a near future. I can suggest you to use
> screen or tmux, they have to workaround your problem.
>
> Thanks,
> Andrew Vagin
>
> > root at worker:/home# cat > test.sh <<-EOF
> > > #!/bin/sh
> > > while :; do
> > >     sleep 1
> > >     date
> > > done
> > > EOF
> > root at worker:/home# chmod +x test.sh
> > root at worker:/home# ./test.sh
> > Mon Jan 19 17:58:57 CET 2015
> > Mon Jan 19 17:58:58 CET 2015
> > ..........................
> > After Restart, i have used ssh.
> >
> >
> > dump.log:
> > Warn  (fsnotify.c:183): fsnotify:       Handle 800003:9db17 cannot be
> opened
> > Warn  (fsnotify.c:183): fsnotify:       Handle 800003:9db1d cannot be
> opened
> > tar: ./udev/control: socket ignored
> >
> > restore.log"
> > Warn  (cr-restore.c:996): Set CLONE_PARENT | CLONE_NEWPID but it might
> cause
> > restore problem,because not all kernels support such clone flags
> combinations!
> > RTNETLINK answers: File exists
> > RTNETLINK answers: File exists
> > RTNETLINK answers: File exists
> >
> > Thank you so much for help.
> > Best Regards.
> >
> > 2015-01-16 12:29 GMT+01:00 Andrew Vagin <avagin at parallels.com>:
> >
> >     On Thu, Jan 15, 2015 at 02:02:56PM +0100, Thouraya TH wrote:
> >     > Hello,
> >
> >     Hello,
> >
> >     Add Tycho into CC.
> >
> >     >
> >     > Please,i have a question about the restarting process of a LXC
> container.
> >     > i run this script http://criu.org/Simple_loop in a container:
> >     >
> >     > 1)
> >     > ubuntu at worker:/home$ ./test.sh
> >     > Wed Jan 14 22:30:23 CET 2015
> >     > Wed Jan 14 22:30:24 CET 2015
> >     > Wed Jan 14 22:30:25 CET 2015
> >     > Wed Jan 14 22:30:26 CET 2015
> >     > Wed Jan 14 22:30:35 CET 2015
> >     > .......................
> >
> >     How do you enter into CT? Do you use screen or ssh?
> >
> >
> >     > 2) i have done the dumping process:
> >     >       root at g-3:/home# lxc-checkpoint -s -D /home/ImGLXC1Worker -n
> worker
> >     > 3) i have restart the container:
> >     >     root at g-3:/home/ImGLXC1Worker# lxc-checkpoint -r -D /home/
> >     ImGLXC1Worker -n
> >     > worker
> >     >      # lxc-ls -f
> >     > NAME     STATE    IPV4        IPV6  GROUPS  AUTOSTART
> >     > -----------------------------------------------------
> >     > worker   RUNNING  10.0.3.109  -     -       NO
> >
> >     Thouraya, Could you increase verbose level for criu and show us dump
> and
> >     restore
> >     logs? Tycho, could you explain how to do this with lxc-checkpoint?
> >
> >     Thanks,
> >     Andrew
> >
> >     >
> >     > 4) ssh ubuntu@$(sudo lxc-info -n worker -H -i)
> >     > 5) ubuntu at worker:/home$ ps
> >     >   PID TTY          TIME CMD
> >     >   304 pts/0    00:00:00 bash
> >     >   318 pts/0    00:00:00 ps
> >     >
> >     > The process "test" didn't restart!
> >     >
> >     > i have done another test : ubuntu at worker:/home$ ./test.sh >
> Results.txt /
> >     > Dumping the container / Restarting the container/ The process
> "test"
> >     didn't
> >     > restart! and the file Results.txt didn't change !
> >     >
> >     > Have you an idea please ?
> >     >
> >     > Thanks a lot.
> >     > Best Regards.
> >
> >     > _______________________________________________
> >     > CRIU mailing list
> >     > CRIU at openvz.org
> >     > https://lists.openvz.org/mailman/listinfo/criu
> >
> >
> >
>
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