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.
> >
> > 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.
>
> Good question. Is there any ability at all within the system to set a quota
> 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
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
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