limiting jail size

[J. Hellenthal]

On Fri, Apr 22, 2011 at 07:39:46AM +0200, Eirik Øverby wrote:
>Hi,
>
>No problem. Use ZFS :)
>And dozens or even hundreds of jails are possible; limited only by RAM and kern.maxfiles ..
>
>/Eirik
>
>On 22. apr. 2011, at 06:31, Mickey Harvey <mh.unet at gmail.com> wrote:
>
>> I was wondering if there is an easy way to limit the amount of hard drive
>> space a jail can take up. Say I have 20 jails on a system would this even be
>> possible?

ZFS is not the only way to limit the jails there certainly is an
abundance of other things you can work at doing to if your limited.

For example:
# mkdir /exports/jail1
# truncate -s 2g /exports/jail1.vnode
# mdconfig -f /exports/jail1.vnode
# newfs -O2 /dev/md0
# mount /dev/md0 /exports/jail1
# <install your environment to /exports/jail1>
# <add whatever else is needed to rc.local or rc.conf>

And you now have a 2G portable jail without all the copy this here that
there mess if you have to back it up just copy the file over to another
jail to adjust for a second running jail and so on.

This is slightly incomplete to a full setup but should be enough to
paint the beginning of the picture for you.


Happy Trees!

-- 

 Regards,
 J. Hellenthal
 WWJD

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