Date: Sat, 3 Jan 2015 10:43:49 -0800 From: Craig Rodrigues <rodrigc@FreeBSD.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-current Current <freebsd-current@freebsd.org>, Neel Natu <neel@freebsd.org> Subject: Re: any primer on running bhyve guests sharing disk with host ? Message-ID: <CAG=rPVeix6%2BewNcDPL9YPe_ZciFMjOkOuFbXR2V_-3Y3qrujJw@mail.gmail.com> In-Reply-To: <20150103161511.GA94237@onelab2.iet.unipi.it> References: <20150103161511.GA94237@onelab2.iet.unipi.it>
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On Sat, Jan 3, 2015 at 8:15 AM, Luigi Rizzo <rizzo@iet.unipi.it> 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. > I don't think there is a way to do exactly what you want. I would recommend doing the following: (1) Enable bvmdebug in your kernel config: https://wiki.freebsd.org/BHyVe/gdb This allows you to do kgdb remote debugging into a bhyve VM. (2) Build your disk image with makefs. You can use this script as an example: https://github.com/freebsd/freebsd-ci/tree/master/scripts/build/build-ufs-image.sh If you still want the bhyve image to use the host's root file system, you can start with the information here: https://www.freebsd.org/doc/handbook/network-diskless.html since you won't be using PXE, you will need to populate these variables in loader.conf in your disk image: http://svnweb.freebsd.org/base/head/sys/nfs/nfs_diskless.c?revision=273174&view=markup#l146 -- Craig
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