question regarding quotas
ryan at sasknow.com
Sun Jun 29 20:31:18 PDT 2003
Josh Brooks wrote to Lowell Gilbert:
> Again, I am just trying to take an arbitrary directory, say:
> and place a configurable limit on how big that directory can get,
> without mounting it as its own filesystem...
FreeBSD doesn't support any filesystems that do this proactively. From
an OS point of view, it doesn't really make sense. However, I can see a
few scenarios where this would be helpful, and it is more than possible
to enforce directory size limits reactively. For example:
if [ $# -ne 1 ]; then
echo "usage: $0 pathname" 1>&2
QUOTA="102400"; # Max. usage, kilobytes
SIZE=`du -xd 0 $1 | cut -f 1`
echo "Directory size is $SIZE"
if [ $SIZE -gt $QUOTA ]; then
echo "$1 is over quota"; # Take appropriate action, here...
echo "$1 is OK";
That's an illustrative example; it'll be easy to extend that to loop
over an arbitrary list of users (or all system users). You can then run
it periodically from cron(8) to check disk usage at the interval of your
choosing, and react accordingly.
As others have mentioned, users may find other directories and
filesystems to store files, thereby circumventing your quota check. So,
it's up to you to harden your system to mitigate that. Also, as this is
a reactive approach, your users still have the ability to fill up your
disk, but at least you can react appropriately (and possibly
automatically). Though, I think I've at least answered your question.
Hope this helps,
Ryan Thompson <ryan at sasknow.com>
SaskNow Technologies - http://www.sasknow.com
901-1st Avenue North - Saskatoon, SK - S7K 1Y4
Tel: 306-664-3600 Fax: 306-244-7037 Saskatoon
Toll-Free: 877-727-5669 (877-SASKNOW) North America
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