Booting a bhyve VM with NFS root?

[Craig Rodrigues]

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.

--
Craig