Re: FreeBSD nfsroot - will it work with NFSv4.2?

On Sun, Apr 12, 2026 at 3:49 PM Dan Shelton <[email protected]> wrote:
>
> On Tue, 7 Apr 2026 at 22:27, Rick Macklem <[email protected]> wrote:
> >
> > On Sun, Apr 5, 2026 at 9:16 AM Rick Macklem <[email protected]> wrote:
> > >
> > > On Thu, Feb 19, 2026 at 2:23 PM Dan Shelton <[email protected]> wrote:
> > > >
> > > > Hello,
> > > >
> > > > Will a FreeBSD 15.0 diskless setup with nfsroot work with NFSv4.2?
> > > I just committed a patch to main that does this, with some limitations.
> > > It will be in 15.1.
> > >
> > > The limitations are:
> > > - The server must be configured to handle both NFSv3 and NFSv4
> > >   because the bootstrap code still uses NFSv3.
> > > - The root directory specified in the "V4:" line in /etc/exports must
> > >   be "/" so that the root-path is the same for an NFSv3 and NFSv4 mount.
> > > - The NFSv4 server must be configured to use id-numbers in strings and
> > >   not be running the nfsused(8) daemon. (This limitation might be lifted
> > >   in a future commit which hard-wires enough mapping info to make
> > >   things work until the nfsuserd(8) daemon is running.)
> > I just did a commit to main that allows the nfsuserd(8) daemon to run
> > on the NFSv4 root fs.
> >
> > I'm not 100% sure if it will work for a read/write root fs mount.
> > (I tested a read-only one, as suggested by Section 34.10 of the
> > FreeBSD Handbook.
> >
> > For the nfsuserd(8) daemon setup (ie. name@domain strings for
> > uid/gid's), you need..
> >
> > In /boot/loader.conf
> > boot.nfsroot.user_domain="<user-domain>"
> > along with the two lines
> > nfsuserd_enable="YES"
> > nfsuserd_flags="-domain <user-domain>"
> > in /etc/sysctl.conf.
>
> Thank you!
>
> What about a static mapping until nfsuserd is running?
The static mapping is in an array called nfs_prime_userd[].
It is filled in statically via initialization in sys/fs/nfs/nfs_commonsubs.c.
(It only has root/wheel/bin/operator at this time, which appears
sufficient to get booted to where nfsuser(8) starts up.)

rick

>
> Dan
>