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

On 2025-04-02 13:39, c186282 wrote:

On 4/2/25 7:14 AM, Carlos E.R. wrote:

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?

     /var/libs/nfs/etab reads "NFS4"

No such file here, not even the directory. It is "/var/lib/nfs/etab" here.
But no, the version is not there:
/data/hoard_1 192.168.2.0/24(rw,sync,wdelay,hide,nocrossmnt,secure,no_root_squash,no_all_squash,subtree_check,secure_locks,acl,no_pnfs,fsid=10,anonuid=65534,anongid=65534,sec=sys,rw,secure,no_root_squash,no_all_squash)

    But remounts to the shared dir still do
   not register.
    I'd LIKE NFS to reflect WHATEVER THE HELL I currently
   have mounted to that share dir.
    Or maybe it just CAN'T ??? There ARE reasons I stuck
   with SAMBA so long ... it (used to) Just Work.

As I said, I restart the server. Or perhaps, "exportfs -r".
Actually, I have a server machine with external disks, and they are just mounted and exported properly, no issues.
Except that if the disk is not mounted, nfs doesn't start.
--
Cheers, Carlos.