Jail and disk space

[Chad Leigh -- Shire.Net LLC]

On Jun 6, 2005, at 1:09 AM, Tim Aslat wrote:

> On Sun, 5 Jun 2005 02:00:35 -0500
> "DrVince" <drvince at anonymnet.net> wrote:
>
>> Could I use quota to limit jails?
>>
>
> Not really, but you might be able to use a "memory disk" (man md,
> mdconfig) to limit the entire jail to a set size.

Yes, I do this.  Almost all my jails reside in md devices (or more  
than one if I have separate ones for logs etc).

Dump works on md devices so it  makes it pretty easy.

Since I use a shared master jail mounted readony inside each jail,  
the jail md devices only have the jail specific files in them and the  
jail users data.  /bin /sbin /lib /usr/bin etc are all shared  
readonly.  Appropriate links into the md device for /usr/local .  / 
etc and /var are in the md device.

Chad


>
> I haven't tried this myself, but I'm guessing something like this  
> should
> work.
>
> #------------------- create jail script -----------------------
> #!/bin/sh
> ID=${ARGV[1]}
> DEST=/jails/jail.${ID}
> IMAGE=/jails/images/jail.${ID}
>
> # create a blank disk image of 512 Mb
> dd if=/dev/zero of=${IMAGE} bs=1024k count=512
> mdconfig -a -t vnode -f ${IMAGE} -u ${ID}
> bsdlabel -w md${ID} auto
> newfs md${ID}c
> mount /dev/md${ID}c ${DEST}
>
> # create jail using created image
> cd /usr/src
> mkdir -p ${DEST}
> make world DESTDIR=${DEST}
> cd etc
> make distribution DESTDIR=${DEST}
> mount_devfs devfs ${DEST}/dev
> cd ${DEST}
> ln -sf dev/null kernel
> #------------------------ End script -----------------------
>
> Again, I haven't tested this, I've just copied & pasted from the
> various man pages into a semi-coherent script.
>
> Cheers
>
> Tim
>
> -- 
> Tim Aslat <tim at spyderweb.com.au>
> Spyderweb Consulting
> http://www.spyderweb.com.au
> Phone: +61 8 84193434
> Mobile: +61 0401088479
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---
Chad Leigh -- Shire.Net LLC
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chad at shire.net