[Devel] Re: [lxc-devel] LXC quota support

[anqin]

On Wed, Sep 2, 2009 at 2:32 AM, Daniel Lezcano<daniel.lezcano at free.fr> wrote:
> Krzysztof Taraszka wrote:
>>
>> Hello,
>>
>> I am looking for quota support for LXC containers. For example, I would
>> like
>> to have two containers.  One of them may have 20GB, second 50GB.
>> I found this one patch:
>>
>> https://lists.linux-foundation.org/pipermail/containers/2009-February/015807.htmland
>> I have a question. Does there is another implemented method for have
>> disk quota for container and his cgrop ? How about rootfs available disk
>> space information ? If no, is there any ideas how to and when the disk
>> quota
>> will be implemented?
>
> Anqui did a first try with this patch. The feature was positively received
> but not in this form. I don't know what is the status of this work, but
> maybe Anqui can give an answer :) - Cc'ed.
>
> Anqui ? Did you tried to implement quotas with the directory hierarchy level
> as suggested Paul ?
>

Yes, I am still in this work. I have attached a tag to directory
hierarchy which
can account the space consumption of each sub-directories and its files for
different task groups. The way indeed can calculate the total disk consumpton
of each group and limit its quota, however other trouble occurs when facing
access control and security issue. I am dealing with the issue.


> Krzysztof, one solution to restrict disk usage to a container can be to
> create an disk image of 20GB, mount it on a directory, install the rootfs on
> it and use this directory as the rootfs for the container.
>

This is another way to achieve same functionalities, by 'dd'ing image file
with given quota and mounting as rootfs of task group. However, it is not
easy to change the limited quota dynamically. This is not flexible enough
for performance control (in green computing) and resource enforcement
(in cloud computing).





Best,

Anqin
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