[CRIU] question on live migration for docker container using CRIU

[Pavel Emelyanov]

On 01/04/2015 09:15 PM, Saied Kazemi wrote:
> Glad that it works for you, and thanks for confirming.

Thanks a lot guys! I will apply the patch shortly.

> --Saied
> 
> 
> On Sun, Jan 4, 2015 at 2:21 AM, mona kashkoush
> <monakashkoush89 at gmail.com> wrote:
>> thank you very much , this patch is very helpful
>>
>> On Fri, Jan 2, 2015 at 9:28 PM, Saied Kazemi <saied at google.com> wrote:
>>>
>>> Mona,
>>>
>>> Pertaining to my previous reply, I just sent a patch for docker_cr.sh
>>> helper script to dynamically determine the right dockerinit file.  It
>>> may be easier for you to apply this patch and use it going forward.
>>>
>>> --Saied
>>>
>>>
>>>
>>> On Fri, Jan 2, 2015 at 9:43 AM, Saied Kazemi <saied at google.com> wrote:
>>>> Hi Mona,
>>>>
>>>> As Pavel pointed out, the error is due to not being able to bind mount
>>>> an external file.  But this is not because a the --ext-mount-map
>>>> command line option is missing.  It's because docker_cr.sh does not
>>>> know the dockerinit file name in /var/lib/docker/init (by default, it
>>>> assume Docker 1.0.0).
>>>>
>>>> Since you are running Docker 1.4, you need to change the following
>>>> BIND_MOUNT line in docker_cr.sh to reflect what you have in
>>>> /var/lib/docker/init:
>>>>
>>>> # since older versions of docker bind mount /.dockerinit but
>>>> # the path cannot be queried by docker inspect, we have to
>>>> # hard code it here
>>>> BIND_MOUNT[/.dockerinit]="${DOCKER_HOME}/init/dockerinit-1.0.0"
>>>>
>>>> Hope this helps.
>>>>
>>>> --Saied
>>>>
>>>>
>>>> On Wed, Dec 31, 2014 at 2:28 AM, Pavel Emelyanov <xemul at parallels.com>
>>>> wrote:
>>>>> On 12/31/2014 04:36 AM, mona kashkoush wrote:
>>>>>>
>>>>>> i tried to  do a live migration for docker container using CRIU 1.4
>>>>>> but dumping failed and this error appeared
>>>>>>
>>>>>> $  criu dump --tree <pid> --images-dir <path-to-existing-directory>
>>>>>> --leave-stopped
>>>>>>
>>>>>> Error (mount.c:624): 125:./etc/hosts doesn't have a proper root mount
>>>>>> Error (files-reg.c:764): Unaccessible path opened 52:21244, need
>>>>>> 5:1029
>>>>>> Error (cr-dump.c:1601): Dump files (pid: 3906) failed with -1
>>>>>> Error (cr-dump.c:1964): Dumping FAILED.
>>>>>>
>>>>>> and when i used the automated script "docker_cr.sh " for docker
>>>>>> container migration , this succeeded for
>>>>>> dumping  but failed for restoring and this error appeared
>>>>>>
>>>>>> $ /src/criu-1.4/contrib/docker_cr.sh -r -v <container_id>
>>>>>>
>>>>>> restore failed
>>>>>> (00.072030)      1: Error (mount.c:1543): Can't mount at
>>>>>> ./.dockerinit: No such file or directory
>>>>>
>>>>> Hm... This looks like some missed --ext-mount-map thing. Can you find
>>>>> out the
>>>>> exact command line docker_cr.sh calls CRIU with?
>>>>>
>>>>> Hopefully Saied (in Cc) can also advise something.
>>>>>
>>>>>> (00.072076) Error (cr-restore.c:1838): Restoring FAILED.
>>>>>>
>>>>>> * this is information about docker which i used
>>>>>>
>>>>>> Storage Driver: aufs
>>>>>>  Root Dir: /var/lib/docker/aufs
>>>>>>  Dirs: 67
>>>>>> Execution Driver: native-0.2
>>>>>> Kernel Version: 3.13.0-43-generic
>>>>>>
>>>>>> thanks for your time
>>>>>>
>>>>>> --
>>>>>> Mona Salah
>>>>>> Research Assistant
>>>>>> IRI institute
>>>>>> The City of Scientific Research and Technology Applications,Alex ,
>>>>>> Egypt
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> CRIU mailing list
>>>>>> CRIU at openvz.org
>>>>>> https://lists.openvz.org/mailman/listinfo/criu
>>>>>>
>>>>>
>>
>>
>>
>>
>> --
>> Mona Salah
>> Research Assistant
>> IRI institute
>> The City of Scientific Research and Technology Applications,Alex , Egypt
> .
>