[CRIU] How to pre-dump lxc or docker?

[Pavel Emelyanov]

On 09/24/2014 08:20 PM, Tycho Andersen wrote:
> On Wed, Sep 24, 2014 at 08:06:24PM +0800, 陈晓 wrote:
>> Becasue I want to dump lxc by copy on write and less the freeze time. The command lxc-checkpoint does not support --pre-images-dir,so I can not dump lxc by pre-dump.So I do not know how to pre-dump lxc.
> 
> You might be able to just take the command line that LXC uses and
> s/dump/pre-dump, I've not tried it but it might work :).

It's not that easy :) If you want to decrease the freeze time with that
then you should start the memory tracker (--track-mem) and on the next
dump say where previous images are (--prev-img-dir).

Not that I'm trying to enforce this feature in lxc. Just to let you know.

> I think this is something we would like to add (patches welcome :),
> but for now the main focus is on making the current implementation of
> lxc-checkpoint solid.
> 
> Tycho
> 
>> thanks,
>> carl
>> 在 2014-09-24 19:43:27，"Pavel Emelyanov" <xemul at parallels.com> 写道：
>> On 09/24/2014 03:29 PM, 陈晓 wrote:
>>> I hava dumped the lxc successfully with lxc tools, but how can I pre-dump lxc,
>>> the command lxc-checkpoint do not support pre-dump.
>>
>> Presumably you can pre-dump one manually, then dump and restore using
>> LXC tools.
>>
>> Why do you need pre-dump?
>>
>> Thanks,
>> Pavel
>>
>