[CRIU] [PATCH] inet: tcp -- Find size of max memory allowed to restore TCP data, v2

[Frederico Araujo]

Answering your questions:

1. Yes, I'm running criu inside the container to dump an application using sockets. The container in question, was created using the lxc ubuntu template.

2. Yes, I have both files on my host OS and I tested sysctl on it. It works fine. The problem is on the container environment, which does not have the files (it has tcp_mem, but not tcp_rmem and tcp_wmem).

Do you know why these files are not mounted on the container? I tried to bind only the ipv4 directory from the host using the containers fstab, but didn't work; I couldn't see the files in there. 

Thanks.

On Oct 11, 2013, at 5:51 AM, Pavel Emelyanov <xemul at parallels.com> wrote:

> On 10/11/2013 03:31 AM, Frederico Araujo wrote:
>> Hi there,
>> 
>> After updating CRIU to the current development version (which contains this patch), checkpoint started crashing
>> when dumping established connections. The problem is that CRIU can't find tcp_rmem and tcp_rmem on the container,
> 
> But patch that is currently in git doesn't try to find them in container. The sysctls in questions
> are read in the kerndat_init() function, which is launched when criu is started, i.e. -- on host.
> 
> Do you want to say, that you run criu itself in contianer to dump something else?
> 
>> although these files exist on the host machine. My host machine and lxc container are running both Ubuntu Saucy
>> (latest update). Also, my lxc container is running unconfined and the network type is veth, linking to a bridge 
>> I created.
>> 
>> I understood the reason for this patch. However, should checkpoint fail in case these two files are not present?
>> Do you guys know a way to make these files available to the guest lxc container?
> 
> These should be available there. Can you check it by hands with "ls /proc/sys/net/ipv4" command?
> 
>> I tried playing with the container's fstab, without success.
>> 
>> Any help or comments will be much appreciated!
>> 
>> Best, 
>> Fred
>> 
>> 
>> 
>> On Mon, Oct 7, 2013 at 10:18 AM, Cyrill Gorcunov <gorcunov at gmail.com <mailto:gorcunov at gmail.com>> wrote:
>> 
>>    On Mon, Oct 07, 2013 at 05:22:09PM +0400, Cyrill Gorcunov wrote:
>>> 
>>> Yeah, I'll check the sysctl engine code, thanks! As to read queue -- I think yes,
>>> you're right, I'll update, thanks!
>> 
>>    Update attached.
>> 
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> 
>