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

From	vallor <vallor@cultnix.org>
Newsgroups	comp.os.linux.misc
Subject	Re: Here's One - NFS - Mounting Over Share = Nada
Date	2025-04-02 11:40 +0000
Message-ID	<m54m11Fhof8U5@mid.individual.net> (permalink)
References	<UQ-dndQV6amaDnH6nZ2dnZfqnPednZ2d@giganews.com> <m54j20Fhof8U3@mid.individual.net> <4qivblx7ff.ln2@Telcontar.valinor>

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On Wed, 2 Apr 2025 13:14:44 +0200, "Carlos E.R." <robin_listas@es.invalid>
wrote in <4qivblx7ff.ln2@Telcontar.valinor>:

> 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?

use "mount | grep mountpoint", the version will be in there as "vers=",
and also the type, e.g.:

$ mount | grep /nfs/ds
192.168.23.12:/volume1/ds on /nfs/ds type nfs4
(rw,relatime,vers=4.0,rsize=131072,wsize=131072,namlen=255,
hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.23.254,
local_lock=none,addr=192.168.23.12)

(I've wrapped the line for posting on Usenet.)

-- 
-v System76 Thelio Mega v1.1 x86_64 NVIDIA RTX 3090 Ti
   OS: Linux 6.14.0 Release: Mint 22.1 Mem: 258G
   "The world is so big and so global now."

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Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-01 21:29 -0400
  Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 12:35 +0200
    Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-02 11:48 +0100
      Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 13:18 +0200
        Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-02 18:04 +0100
          Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 05:51 -0400
            Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-03 11:08 +0100
            Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-03 14:07 +0200
              Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 11:27 -0400
                Re: Here's One - NFS - Mounting Over Share = Nada Ralf Fassel <ralfixx@gmx.de> - 2025-04-03 18:36 +0200
                Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-03 18:09 +0100
                Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 16:42 -0400
                Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 15:27 -0400
                Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-03 18:08 +0100
                Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-03 20:48 +0200
                Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 15:49 -0400
  Re: Here's One - NFS - Mounting Over Share = Nada vallor <vallor@cultnix.org> - 2025-04-02 10:49 +0000
    Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-02 07:12 -0400
    Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 13:14 +0200
      Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-02 07:39 -0400
        Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 14:19 +0200
          Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-02 08:38 -0400
            Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 15:30 +0200
      Re: Here's One - NFS - Mounting Over Share = Nada vallor <vallor@cultnix.org> - 2025-04-02 11:40 +0000
        Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-02 08:08 -0400
          Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 14:25 +0200
        Re: Here's One - NFS - Mounting Over Share = Nada "Carlos E.R." <robin_listas@es.invalid> - 2025-04-02 14:15 +0200
          Re: Here's One - NFS - Mounting Over Share = Nada Computer Nerd Kev <not@telling.you.invalid> - 2025-04-03 16:40 +1000
            Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 06:19 -0400
              Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-03 12:03 +0100
                Re: Here's One - NFS - Mounting Over Share = Nada c186282 <c186282@nnada.net> - 2025-04-03 07:27 -0400
                Re: Here's One - NFS - Mounting Over Share = Nada The Natural Philosopher <tnp@invalid.invalid> - 2025-04-03 12:38 +0100

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