From owner-freebsd-current@FreeBSD.ORG  Sat Jan  3 17:06:40 2015
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 773CC684;
 Sat,  3 Jan 2015 17:06:40 +0000 (UTC)
Received: from zxy.spb.ru (zxy.spb.ru [195.70.199.98])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 32A4464686;
 Sat,  3 Jan 2015 17:06:40 +0000 (UTC)
Received: from slw by zxy.spb.ru with local (Exim 4.84 (FreeBSD))
 (envelope-from <slw@zxy.spb.ru>)
 id 1Y7S9t-0007D7-Nu; Sat, 03 Jan 2015 21:06:37 +0400
Date: Sat, 3 Jan 2015 21:06:37 +0400
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Luigi Rizzo <rizzo@iet.unipi.it>
Subject: Re: any primer on running bhyve guests sharing disk with host ?
Message-ID: <20150103170637.GA23767@zxy.spb.ru>
References: <20150103161511.GA94237@onelab2.iet.unipi.it>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20150103161511.GA94237@onelab2.iet.unipi.it>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-SA-Exim-Connect-IP: <locally generated>
X-SA-Exim-Mail-From: slw@zxy.spb.ru
X-SA-Exim-Scanned: No (on zxy.spb.ru); SAEximRunCond expanded to false
Cc: freebsd-current@freebsd.org, neel@freebsd.org
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 03 Jan 2015 17:06:40 -0000

On Sat, Jan 03, 2015 at 05:15:11PM +0100, Luigi Rizzo wrote:

> Hi,
> in order to do some kernel testing, I would like to run bhyve guests
> using (through NFS, probably) the host's file system.
> diskless(8) is probably one way to go, i was wondering if
> someone has instructions for that.
> Specifically:
> - how to "bhyveload" a kernel (rather than the full disk image);
>   as an alternative, given a kernel, something to build an image
>   that can be passed to bhyveload
> 
> - how to pass the necessary config (rootpath) to the client
>   without having to rely on a specialized dhcp server
> 
> I used to be familiar with diskless configs, so i can probably sort
> out the server side myself.

May be I missunderstand you, but diskless client-specific config relay
on client IP address (ex: /conf/ip/1.2.3.4/...).

Also, diskless boot relay on BIOS network support (by PXE, for
example), with working NIC, assigned IP address and etc.