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Spanik
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Location: Belgium
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 Posted: Sun Jan 14, 2024 1:53 pm Post subject: where does a mount point points to? (solved) |
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I have a few disks that I mount under /mnt with fstab at boot.
| Code: | PARTUUID=4d06bb89-cbf7-d84c-9ee1-fa1ce078ee01 /boot vfat noauto,noatime 1 2
UUID=076be15c-015b-4bd6-8c2a-a8a9ecd5ddca none swap sw 0 0
UUID=96d663c8-081a-4834-8766-1acca3cde0a2 / xfs noatime 0 1
UUID=5961004a-94f5-4c20-9746-7c721d22e6ec /mnt/main_data xfs noatime,rw,exec,suid 0 1
UUID=94063aea-cfd4-4f05-9228-f10ba1c08ae2 /mnt/rommel xfs noatime,rw,exec,suid 0 1
UUID=cf9c0169-59c9-4c28-9d8c-d7a77b3897ca /mnt/mail xfs noatime,rw,exec,suid 0 1
UUID=377e334b-7a76-43f2-b5a9-587cd1caabed /mnt/virt_xp xfs noatime,rw,exec,suid 0 1
192.168.2.8:/export/NAS /mnt/nas nfs noauto,rw,users,_netdev 0 0
UUID=7a672622-1440-484e-bc87-00576368798c /mnt/virt_w10 xfs noatime,rw,exec,suid 0 0
UUID=af933230-3b88-4f54-80a8-cee994a02fc2 /mnt/muziek xfs noatime,rw,exec,suid 0 0
LABEL=muziek /mnt/usb_muziek ntfs noatime,rw,exec,suid 0 0
LABEL=backup /mnt/backup xfs noatime,rw,exec,suid 0 0 |
Now those UUID mounts are ok. The mounts done with a label are for USB disks that I use for backup and there are several of them in rotation being swapped with other locations. But this is ok as well. The problem sits with the NAS: 192.168.2.8:/export/NAS /mnt/nas nfs noauto,rw,users,_netdev 0 0
I had a NAS but nothing but trouble with it. So I put other software on it (Openmediavault). It sits at the same IP address as before and it shows the share as /export/NAS when I do a "showmount -e 192.168.2.8".
The problem is that if I go to /mnt/muziek, then I find files there! While I'm very sure that the install of Openmediavault wiped the disks of the NAS. So there should not be any data on it. So how can I check if that is really on the NAS or "somewhere else"? After all, /mnt is just another directory on / so it could be that those files sit on my / disk.
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Last edited by Spanik on Wed Jan 17, 2024 10:07 am; edited 1 time in total |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Sun Jan 14, 2024 2:24 pm Post subject: |
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Spanik,
| Code: | | LABEL=muziek /mnt/usb_muziek ntfs noatime,rw,exec,suid 0 0 |
When that USB is mouthed to /mnt/usb_muziek df -T will show it as an ntfs filesystem of some sort.
/mnt/muziek should be a local xfs filesystem, so the files it contains are on the local system.
| Code: | | LABEL=muziek /mnt/usb_muziek ntfs |
and | Code: | | UUID=af933230-3b88-4f54-80a8-cee994a02fc2 /mnt/muziek xfs |
are not the same thing even if the content appears to be identical.
Neither appear to be nfs mounts either.
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Spanik
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Joined: 12 Dec 2003
Posts: 963
Location: Belgium
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| Posted: Sun Jan 14, 2024 2:36 pm Post subject: |
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I know it is probably confusing but the setup is as follows:
| Code: |
UUID=af933230-3b88-4f54-80a8-cee994a02fc2 /mnt/muziek xfs noatime,rw,exec,suid 0 0
LABEL=muziek /mnt/usb_muziek ntfs noatime,rw,exec,suid 0 0 |
/mnt/muziek is a separate hdd in the pc that is always mounted. This one is xfs like all disks in the desktop.
/mnt/usb_muziek is mounted with a LABEL as this is used to make a copy of /mnt/muziek using rsync to a (set of 3) usb HDD disks. The USB disks have all 3 the same label and are ntfs as they also need to be readable on a windows system.
The problem is with
| Code: | | 192.168.2.8:/export/NAS /mnt/nas nfs noauto,rw,users,_netdev 0 0 |
If I go to /mnt/nas then I find a folder and files in it while the setup of the NAS should have wiped all files. So where are those files? And they are there, I can open them.
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NeddySeagoon
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| Posted: Sun Jan 14, 2024 2:53 pm Post subject: |
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Spanik,
ssh into the NAS at have a look at what /etc/exports tells.
Go there and see if the files are there or not.
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NeddySeagoon
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Spanik
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| Posted: Sun Jan 14, 2024 3:16 pm Post subject: |
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As expected, there is nothing on the NAS. But where on my system are those files then? Are they really in /mnt on / or is it a mounted disk in the desktop? Is there a way to get the info as /dev/xxx/mnt/...
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NeddySeagoon
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| Posted: Sun Jan 14, 2024 3:25 pm Post subject: |
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Spanik,
umount all the filesystems in /mnt, until df shows nothing inside /mnt
Now run to see where the space is used.
Run that again but add the -x option to du.
| man du: | -x, --one-file-system
skip directories on different file systems
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If you get the same output from both, the files are really in /mnt.
Its easy to do that if you copy something to what you intended to use as a mount point but with nothing mounted.
The popular example in Gentoo is to install a new kernel to /boot without mounting boot first.
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NeddySeagoon
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Spanik
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| Posted: Sun Jan 14, 2024 4:34 pm Post subject: |
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| NeddySeagoon wrote: | If you get the same output from both, the files are really in /mnt.
Its easy to do that if you copy something to what you intended to use as a mount point but with nothing mounted.
The popular example in Gentoo is to install a new kernel to /boot without mounting boot first. |
Ok, so that is it, I must have copied some things in /mnt/nas without the nas being mounted. So I can delete them without wondering if I'm going do something irreversible. Thanks!
Strange thing was I couldn't unmount /mnt/main_data, it was "in use". While I had closed every application. Had to reboot, log in a termimnal, go to a root shell and then unmount everything. After that I could startx. But my background is gone. So the file that was still in use is probably the KDE background!
And I admit having updated a kernel and forgotten to mount /boot Mea culpa, mea culpa, mea maxima culpa.
EDIT: but this means that the NAS doesn't mount... 
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NeddySeagoon
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| Posted: Sun Jan 14, 2024 4:46 pm Post subject: |
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Spanik,
Can you mount the NAS by hand ?
If not, the error messages will be useful.
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NeddySeagoon
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Hu
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| Posted: Sun Jan 14, 2024 5:10 pm Post subject: |
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| Spanik wrote: | | EDIT: but this means that the NAS doesn't mount... |
| Spanik wrote: | | Code: | | 192.168.2.8:/export/NAS /mnt/nas nfs noauto,rw,users,_netdev 0 0 |
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Did you tell the system to mount the NAS? Your fstab entry has it marked as noauto, so the boot scripts will not mount it for you. It will only be mounted if root explicitly runs mount /mnt/nas or equivalent, or possibly some desktop program gets more clever than it should be and ignores that noauto. |
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Spanik
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Location: Belgium
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| Posted: Sun Jan 14, 2024 8:34 pm Post subject: |
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Good point. I did double check and you are absolutely right, I didn't mount it and that is why I see the files that were copied by error on /mnt/nas (but not the nas itself).
Looks like I can mount it but not use it. When I mount the nas then I see an empty directory as it should be. Only problem is I cannot copy a file to it of make a directory on it. But that will be some nas settings without doubt. I'll need a few evenings of RTFM...
But the question of finding out where the files that I do see are is solved thanks to you guys. (now I can wipe them)
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Hu
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| Posted: Sun Jan 14, 2024 9:37 pm Post subject: |
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| What happens when you try to write to the mount? Your post implies that it fails, but you did not share any error messages. |
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Spanik
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Joined: 12 Dec 2003
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Location: Belgium
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| Posted: Mon Jan 15, 2024 6:48 pm Post subject: |
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| Hu wrote: | | Spanik wrote: | | EDIT: but this means that the NAS doesn't mount... |
| Spanik wrote: | | Code: | | 192.168.2.8:/export/NAS /mnt/nas nfs noauto,rw,users,_netdev 0 0 |
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Did you tell the system to mount the NAS? Your fstab entry has it marked as noauto, so the boot scripts will not mount it for you. It will only be mounted if root explicitly runs mount /mnt/nas or equivalent, or possibly some desktop program gets more clever than it should be and ignores that noauto. |
It doesn't mout at boot, but if I select that directory in KDE Dolphin, it first mounts it.
| Hu wrote: | | What happens when you try to write to the mount? Your post implies that it fails, but you did not share any error messages. |
cp: cannot create regular file 'xxxxxx': permission denied. I probably do not have set the permissions on the nas correctly. I remember from the previous tries with Truenas that I also had that problem. It isn't a problem of the nas, it is me not understanding permissions in a linux system very well. That will be for another evening as I right now have other problems of work getting into the way of life.
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Spanik
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| Posted: Wed Jan 17, 2024 10:11 am Post subject: |
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As expected, the last hurdle was configuration of users and permissions for nfs on the NAS.
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