[CRIU] Restarting Process in an LXC Container

[Pavel Emelyanov]

On 01/22/2015 07:41 PM, Thouraya TH wrote:
> *Dumping Process* with - s option:
> 
> root at g-9:/home# lxc-checkpoint *-s *-D /home/ImGLXC1Worker -n worker
> root at g-9:/home# lxc-ls -f
> NAME     STATE    IPV4  IPV6  GROUPS  AUTOSTART 
> -----------------------------------------------
> worker   *STOPPED*  -     -     -       NO
> 
> *I have done this test:*
> You have said: "/Check the file contents *after dump* but *before restore*. Does this file exists
> at all? Does it contain proper data?/"
> 
> 1) dumping Process with -s option
> 2) root at g-9:/home/ImGLXC1Worker1# lxc-start -n worker
>     root at g-9:/home/ImGLXC1Worker1# lxc-ls -f
> NAME     STATE    IPV4        IPV6  GROUPS  AUTOSTART 
> -----------------------------------------------------
> worker   RUNNING  10.0.3.109  -     -       NO        
> worker1  STOPPED  -           -     -       NO        
> root at g-9:/home/ImGLXC1Worker1# ssh ubuntu@$(sudo lxc-info -n worker -H -i)
> ..............
> ubuntu at worker:/home$ vim results.txt
> 
> *the file exists and contains the proper data.*
> 
> 3) i stopped the container to test the restart:
>    root at g-9:/home/ImGLXC1Worker1# lxc-stop -n worker
>    root at g-9:/home/ImGLXC1Worker1# lxc-ls -f
> NAME     STATE    IPV4  IPV6  GROUPS  AUTOSTART 
> -----------------------------------------------
> worker   STOPPED  -     -     -       NO        
> worker1  STOPPED  -     -     -       NO        
>     root at g-9:/home/ImGLXC1Worker1#  *lxc-checkpoint -r* -D /home/ImGLXC1Worker1 -n worker
>     root at g-9:/home/ImGLXC1Worker1# ssh ubuntu@$(sudo lxc-info -n worker -H -i)
>     ^C
>    root at g-9:/home/ImGLXC1Worker1#
>    root at g-9:/home/ImGLXC1Worker1# lxc-ls -f
> 
> ^CTraceback (most recent call last):
>   File "/usr/bin/lxc-ls", line 432, in <module>
>     containers = get_containers(root=True)
>   File "/usr/bin/lxc-ls", line 261, in get_containers
>     if container.controllable:
> KeyboardInterrupt
> 
> *it's blocked!! *

This should be forwarded to LXC guys.

> *I proceeded as follows and the test process in the container restarts correctly:
> 
> Restart* (after dumping process without starting and stopping the container)
>                 
> root at g-9:/home# lxc-checkpoint -r -D /home/ImGLXC1Worker -n worker
> root at g-9:/home#  lxc-ls -f
> NAME     STATE    IPV4        IPV6  GROUPS  AUTOSTART 
> -----------------------------------------------------
> worker   RUNNING  10.0.3.109  -     -       NO        
> worker1  STOPPED  -           -     -       NO        
> root at g-9:/home# ssh ubuntu@$(sudo lxc-info -n worker -H -i)
> ..............
> ubuntu at worker:/home$ vim results.txt
> 
> i find the old and the new results in the file :)

So everything is fine, isn't it?

Thanks,
Pavel