quotas + jail ?

[Vladimir Dvorak]

Björn König wrote:

> Vladimir Dvorak schrieb:
>
>> I have simple question - is possible to use quotas in jail(8)
>> environment ?
>> [...]
>>
>> It seems to be impossible ( some kernel restriction ). :-( Is there some
>> way to allow this ? My last idea was to replicate users and groups to
>> "main" system and use quotas from it - but it is not good solution if we
>> have several hundreds users in jail(8).
>
>
> You don't need to replicate users and groups, just use UIDs and GIDs.
> There is a serious disadvantage: if you set quota for a specific UID
> then it affects all users with the same UID in different jails and
> even at the host; I guess this is not what you want.
>
> If you want to restrict the space that can be consumed by a jail then
> you might use memory devices, i.e.
>
> # create 1 GiB file
> $ dd if=/dev/zero of=myjail321 count=16k bs=64k
> $ mdconfig -af myjail321
> md321
> $ mkdir /jail/myjail321
> $ mount /dev/md321 /jail/myjail321
> $ cd /usr/src
> $ make installworld DESTDIR=/jail/myjail321
>
> and so on ...
>
>
> Regards
> Björn
>
Thank you Björn,

I thing it is possible. I will shift existing UIDs ( in jail) to higher
values (50000-> ) and apply quotas on them. I will try to eliminate UID
mixing.

Thank you for your suggestion.

Vladimir