Date: Wed, 25 Feb 2015 17:53:02 +0100 From: Stefan Bethke <stb@lassitu.de> To: Craig Rodrigues <rodrigc@freebsd.org> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: Booting a bhyve VM with NFS root? Message-ID: <D5AB5F0A-9678-453C-89FA-23797F45B42A@lassitu.de> In-Reply-To: <CAG=rPVdeVRpK%2BN4P4Y4Qd%2BKfEPKQAdFgxGq=_O2dOFSGGwELEQ@mail.gmail.com> References: <CAG=rPVdeVRpK%2BN4P4Y4Qd%2BKfEPKQAdFgxGq=_O2dOFSGGwELEQ@mail.gmail.com>
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Am 06.11.2014 um 20:52 schrieb Craig Rodrigues <rodrigc@freebsd.org>: > Hi, > > Has anyone tried the following: > > (1) Create a disk image, which only has the contents of the /boot > directory > and /etc/fstab. > (2) /etc/fstab should specify the root file system over NFS > (3) Boot the disk image in bhyve. The loader will parse /etc/fstab, > and it will also load the kernel and boot it. When the kernel > boots > it will mount the root file system over NFS. > > For a real system running with a BIOS, PXE can be used for a lot of this: > https://www.freebsd.org/doc/handbook/network-diskless.html > > The pxeldr populates some kernel environment variables which are then > used to mount a root file system: > > https://svnweb.freebsd.org/base/head/sys/nfs/nfs_diskless.c?revision=273174&view=markup#l145 > > Has anyone tried manually specifying these variables > via the "bhyveload -e" arguments, and forcing the VM to mount its root file > system over NFS? > > This would be handy for very quickly test booting a new buildworld. Here's a quick hack to get the necessary variables in the appropriate format: https://github.com/stblassitude/boot_root_nfs I think the kernel should learn how to do the necessary mount RPC if the handle is not set, but I don't think I'm up to implementing that... Stefan -- Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811help
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