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Date:      Wed, 27 Feb 2002 23:53:20 +0000
From:      Nik Clayton <nik@freebsd.org>
To:        Kirk Strauser <kirk@strauser.com>
Cc:        Patrick Thomas <root@utility.clubscholarship.com>, freebsd-hackers@FreeBSD.ORG, freebsd-emulation@FreeBSD.ORG
Subject:   Re: using vnconfig devices instead of partitions for jails ?
Message-ID:  <20020227235320.C4562@canyon.nothing-going-on.org>
In-Reply-To: <878z9ek580.fsf@pooh.int>; from kirk@strauser.com on Wed, Feb 27, 2002 at 03:03:11PM -0600
References:  <20020227124518.X67780-100000@utility.clubscholarship.com> <878z9ek580.fsf@pooh.int>

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On Wed, Feb 27, 2002 at 03:03:11PM -0600, Kirk Strauser wrote:
> At 2002-02-27T20:49:18Z, Patrick Thomas <root@utility.clubscholarship.com=
> writes:
> > I would like to put a large number of jails (16 or 20) on a server for
> > testing purposes.
> >=20
> > I have two options so far: create 16 or 20 partitions OR just put them =
all
> > in one partition, but the downside of that is that then I cannot enforce
> > disk usage between jails.  So at this point, 16-20 partitions seems the
> > safest route.
>=20
> Good question.  Is there any ability at all within the system to set a qu=
ota
> on a jail?

Each vn* device has to be baced by a physical file on the system.
Simply make sure that this physical device is the maximum size you want
to allow in the jail.

For example, on a server with 160GB of (RAID) disk, and 12 jails, each 10GB=
=20
in size, I just have 12 jails;

On the 'master' host for the jails.

    # cd /usr/local/jails/disk-images
    # ls -l
    totall 1758115
    drwxr-xr-x  2 root  wheel          512 Jan 23 00:40 .
    drwxr-xr-x  4 root  wheel          512 Jan 23 00:39 ..
    -rw-r--r--  1 root  wheel          136 Jan 22 18:45 README
    -rw-r--r--  1 root  wheel  10737418240 Feb 27 23:35 foo.com.vn
    -rw-r--r--  1 root  wheel  10737418240 Feb 27 23:35 bar.com.vn
    -rw-r--r--  1 root  wheel  10737418240 Feb 27 23:35 baz.com.vn
    ...

These were created with "truncate 10G file", and are then mounted
configued on different vn* devices, which are then mounted as normal.

    # mount
    ...
    /dev/vn0a on /usr/local/jails/foo.com
    /dev/vn1a on /usr/local/jails/bar.com
    /dev/vn2a on /usr/local/jails/baz.com
    ...

N
--=20
FreeBSD: The Power to Serve      http://www.freebsd.org/               (__)
FreeBSD Documentation Project    http://www.freebsd.org/docproj/    \\\'',)
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_)

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