[nycbug-talk] nullfs, jails and quotas

[pete wright]

On 1/14/06, Isaac Levy <ike at lesmuug.org> wrote:
> Hi Charles, All,
>
> On Jan 12, 2006, at 10:40 PM, Charles Sprickman wrote:
>
> > Ike,
> >
> > I've seen that warning, and I think we've discussed it here before
> > as well.  My problem is that I did not really think about this when
> > I turned on quotas.  I was simply using nullfs to get the host's
> > ports tree into the jail, and normally I unmount it when I'm done
> > mucking about.
>
> Ok- I  have a solid solution for you- File-backed memory filesystems
> (disk images, if you grok apple livin').
>
> I put a recipe in my lecture at Shmoo here, I'll post it to this list
> if anyone requests it.  But better, it's a simple direct application
> of the following howto:
>
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/disks-
> virtual.html
>
> My thought is you could have 1 disk image with the ports tree on it,
> and mount it readonly in the jails, over and over...  You could even
> mount it read/write on one jail, and update it from that one jail...
>
> Why do I reccommend this? mdconfig(8) is VERY heavily supported, and
> it's base is used in the 'new' mechanisms to mount things like devfs
> and procfs (new as of 5.x branch...).
>
> Hope that helps you solve that problem?
>

I'd love to see the notes man.  i've been playing with memory file
systems lately (mounting /tmp as a memfs partition for nagios to use
as scratch space for example) and would to test this out on some
jailing stuff.

thanks!
-pete



--
~~o0OO0o~~
Pete Wright
www.nycbug.org
NYC's *BSD User Group