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From: =?utf-8?Q?Eirik_=C3=98verby?= <ltning@anduin.net>
Date: Sat, 23 Apr 2011 08:49:12 +0200
To: "J. Hellenthal" <jhell@DataIX.net>
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Cc: "freebsd-jail@freebsd.org" <freebsd-jail@freebsd.org>
Subject: Re: limiting jail size
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On 23. apr. 2011, at 04:17, "J. Hellenthal" <jhell@DataIX.net> wrote:

> On Fri, Apr 22, 2011 at 07:39:46AM +0200, Eirik =C3=98verby wrote:
>> Hi,
>>=20
>> No problem. Use ZFS :)
>> And dozens or even hundreds of jails are possible; limited only by RAM an=
d kern.maxfiles ..
>>=20
>> /Eirik
>>=20
>> On 22. apr. 2011, at 06:31, Mickey Harvey <mh.unet@gmail.com> wrote:
>>=20
>>> I was wondering if there is an easy way to limit the amount of hard driv=
e
>>> space a jail can take up. Say I have 20 jails on a system would this eve=
n be
>>> possible?
>=20
> 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.
>=20
> 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>
>=20
> 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.

I used to do this, and still do for some static/embedded stuff. I changed to=
 ZFS though for most jails - that gets you a whole lot of other benefits lik=
e quotas, compression, better snapshots, etc.=20

/Eirik

> This is slightly incomplete to a full setup but should be enough to
> paint the beginning of the picture for you.
>=20
>=20
> Happy Trees!
>=20
> --=20
>=20
> Regards,
> J. Hellenthal
> WWJD
>=20