From owner-freebsd-hackers@FreeBSD.ORG  Mon Jun  9 11:09:51 2003
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Date: Mon, 9 Jun 2003 11:11:32 -0700
From: Joshua Oreman <oremanj@webserver.get-linux.org>
To: Ted Faber <faber@ISI.EDU>
Message-ID: <20030609181132.GC85429@webserver.get-linux.org>
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cc: hackers@freebsd.org
Subject: Re: ramdisk??
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On Mon, Jun 09, 2003 at 11:04:52AM -0700 or thereabouts, Ted Faber seemed to write:
> On Mon, Jun 09, 2003 at 01:16:26PM -0400, romero3000@romero3000.com wrote:
> > (sorry about cross-posting this question. not sure which list is better)
> > 
> > I want to to know how to create a ram file system for /var and /tmp so
> > that i can boot from flash memory and mount those two file systems on
> > ramfs. I've looked for howto's online but haven't found anything. any
> > suggestions????
> 
> On CURRENT:

You mean -stable, don't you?

> 
> man vnconfig
> man vn
> 
> I mount a swap backed fs (which I what I suspect you want) with:
> 
> vnconfig -e -s labels -S ${vn_tmp_size} ${vn_tmp_device} && \
> disklabel -r -w ${vn_tmp_device} auto && \
> newfs /dev/${vn_tmp_device}c > /dev/null  && \
> mount -o nosuid -o nodev /dev/${vn_tmp_device}c /tmp && \
> chmod 1777 /tmp
> 
> N.B. I don't reserve the blocks on swap, which again is what I think you
> want.

On -current:

man mdconfig
man md

How to do the above:

vn_tmp_device=`mdconfig -a -t swap -s ${vn_tmp_size}m` &&
disklabel -r -w ${vn_tmp_device} auto && \
newfs /dev/${vn_tmp_device} >/dev/null && \
mount -o nosuid,nodev /dev/${vn_tmp_device} /tmp && \
chmod 1777 /tmp

Replace ${vn_tmp_size} with the size of the disk, in Mb.

-- Josh

> 
> Good luck.
>