[PLUG] Netbooting device needs NFSv2

[Russell Senior]

I'm in!

Thanks for everyone's brain cells. I am incrementally smarter than before.

-- 
Russell Senior
russell at personaltelco.net

On Wed, Dec 18, 2024 at 2:00 PM Jason Bergstrom <bergie at bergie.net> wrote:
>
> https://wiki.debian.org/NFSServerSetup and rpc.nfsd man page.
> Add to /etc/default/nfs-kernel-server
>
> # Offer +v2
> RPCNFSDOPTS="-V 2 -V 3 -V 4 -V 4.1"
>
> Jason,
> bergie at bergie.net
>
> On Wed, Dec 18, 2024 at 04:33:48PM -0500, Tomas Kuchta wrote:
> > Wouldn't you need to echo to equivalent /sys file?
> >
> > On Wed, Dec 18, 2024, 16:28 Russell Senior <russell at personaltelco.net>
> > wrote:
> >
> > > I found /proc/fs/nfsd/versions contains:
> > >
> > >   -2 +3 +4 +4.1 +4.2
> > >
> > > That looks relevant. I wonder where the hell that is set? Or whether I
> > > can just echo something at it. Permissions say rw.
> > >
> > > On Wed, Dec 18, 2024 at 6:30 AM Jason Bergstrom <bergie at bergie.net> wrote:
> > > >
> > > > It will be UDP, possibly check the portmapper, too.
> > > >
> > > > I haven't used v2 since SunOS, but you could try compiling the old
> > > > nfs-user-server, or run an old OS in a VM... since you are looking for
> > > > something to do.
> > > >
> > > > Jason,
> > > > bergie at bergie.net
> > > >
> > > > On Wed, Dec 18, 2024 at 06:03:23AM -0800, Russell Senior wrote:
> > > > > My kernel config in /boot/config-5.10.0-33-amd64 has
> > > > > "CONFIG_NFSD_V2=y" ... which makes me think there is a configuration
> > > > > that has disabled v2 support despite it being available.
> > > > >
> > > > > --
> > > > > Russell Senior
> > > > > russell at personaltelco.net
> > > > >
> > > > > On Wed, Dec 18, 2024 at 5:48 AM Russell Senior
> > > > > <russell at personaltelco.net> wrote:
> > > > > >
> > > > > > ... but my debian 11 server seems (according to my packet capture) to
> > > > > > only support NFSv3 and NFSv4. Does anyone happen to know how to
> > > enable
> > > > > > NFSv2 on nfs-kernel-server for this device? Or have any other
> > > > > > suggested solutions to this problem?
> > > > > >
> > > > > > The device is an ancient Soekris net4826 from the mid-aughts. It has
> > > > > > soldered on flash storage, so the only way to recover from crashing
> > > > > > firmware is to netboot. My setup *used to* work. It's getting DHCP
> > > > > > information for PXE booting, TFTP's a kernel, but when the kernel
> > > > > > attempts to mount an nfs rootfs, the mount fails and it kernel
> > > panics.
> > > > > > We have one of them still in service in the field (and I have another
> > > > > > one sitting in my test bed, crashing).
> > > > > >
> > > > > > The right solution is probably just to retire the one in the field
> > > and
> > > > > > put the whole lot of them into a "museum box", but hey, it's the
> > > > > > holidays. What better period to waste a bunch of time keeping
> > > creaking
> > > > > > hardware alive. And anyway, the museum curators will be more thrilled
> > > > > > to create an exhibit if they have working firmware.
> > > > > >
> > > > > > Thanks for any clues, meanwhile I'll keep searching the interwebs.
> > > > > >
> > > > > > --
> > > > > > Russell Senior
> > > > > > russell at personaltelco.net
> > > > >
> > >
> >