Re: Here's One - NFS - Mounting Over Share = Nada

On 2025-04-02 12:49, vallor wrote:

On Tue, 1 Apr 2025 21:29:48 -0400, c186282 <c186282@nnada.net> wrote in
<UQ-dndQV6amaDnH6nZ2dnZfqnPednZ2d@giganews.com>:
 

Here's an interesting problem ....
>
I re-mount USB drives onto NFS share points. The problem is that NFS
doesn't SEE that - it only sees the previously empty dir instead.
Add a tag file to that dir and that's ALL you will see in the share on
another PC.
>
Tried variations of exportfs ... including the '-r' and '-au' then '-a'
AFTER doing the mount. Sorry, the clients can't see the mount. The NFS
stuff seems to cut in very early - before the USB re-mounts (done
@reboot). If you look on the host machine you DO see the USB drives, but
NEVER over the NFS share.
>
Why re-mount the USBs ? Because you can't always rely on Linux to mount
them in the same order, used to be even the same place.
'/media/<user>/whatever' seems hard-wired these days, but with multiple
USB drives you still can't count on drive 1 being the drive 1 in
/media/<user>. Kinda depends on which comes online first.
Naming the drives helps, but even then.
>
And no, symlinks to some other mount point don't work ... NFS just
shares a link to nowhere on the clients. 'hard' links ???
>
Have ONE share that's not a re-mounted anything - THAT always shows
perfectly on the clients. Weird thing, somehow, at one point I DID get
it to work - but not sure HOW. Just commented-out the old NFS and fstab
stuff, so I've been able to re-try, but now none work. Set everything to
775 or 777 for development work, but that doesn't help.
>
SAMBA - this sort of thing works fine, but I've had horrible probs with
SAMBA with the latest distros, ALWAYS intractable permissions issues no
matter the tweaks, hence using NFS.
>
So ... any insights on how to get NFS to "see" whatever IS mounted to
the share point AT THE MOMENT ???
>
Oh, latest MX Linux.

 Take a look at "man exports" under the "nohide" option.

Ah, yes.
Last line says "not if you use NFSv4". The hiding doesn't happen with version 4.
Reminds me of something. How does one know what version is actually used?
--
Cheers, Carlos.