I cant see files under NFS usage, why?

bischop · 02-29-2020, 07:20 PM

I installed & confiugred NFS on ubnutu 18.04.

Directory /mnt/samba is shared by SAMBA and NFS server.
I'm connecting as a client by Windows 10 on it and:
- I can see/read/write directories & files on samba usages
- I can see directories by NFS usage but I can't see any files inside

What is wrong?

Files /mnt/samba on Linux ext4 partition are:
- directories nobody:nogroup 0777
- files 0777 (.exe files) or 0666 (all others)

Samba usage is configured by /etc/samba/smb.conf as:

Code:

[3.TB.partition.1]
        comment = 3 TB p.1 encrypted partition
        path = /mnt/samba/3.TB/partition.1
        writable = yes
;       browsable = yes
        guest ok = yes
        create mask = 0777
        directory mode = 0777

NFS usage is:
/etc/exports:

Code:

/mnt/samba 192.168.0.0/24(rw,async,no_subtree_check,root_squash)

camorri · 03-01-2020, 04:20 PM

Have you installed NFS support on windows 10? Have a look here -->https://graspingtech.com/mount-nfs-share-windows-10/

NFS support is only available on Enterprise and Pro versions of Win 10.

bischop · 03-01-2020, 05:12 PM

Quote:

Originally Posted by camorri

Have you installed NFS support on windows 10? (...)

Yes, I did. But it's not a problem with client - I tested under another Linux system as a client as well.

What I noticed everything is working good but to resolve the problem:
- I did mount data disks with the partitions on it, under

Code:

/mnt/shared

There I got structure:

Code:

/mnt/shared/3.TB/partition.1
/mnt/shared/3.TB/partition.2
/mnt/shared/4.TB/partition.1
/mnt/shared/4.TB/partition.2

Now I mapped all those four partitions directly into:

Code:

/etc/exports

as

Code:

/mnt/shared/3.TB/partition.1    serverIP/24(rw,async,no_subtree_check,root_squash,anonuid=1000,anongid=1000)
/mnt/shared/3.TB/partition.2    serverIP/24(rw,async,no_subtree_check,root_squash,anonuid=1000,anongid=1000)
/mnt/shared/4.TB/partition.1    serverIP/24(rw,async,no_subtree_check,root_squash,anonuid=1000,anongid=1000)
/mnt/shared/4.TB/partition.2    serverIP/24(rw,async,no_subtree_check,root_squash,anonuid=1000,anongid=1000)

So now, I'm able to connect to the server NFS by four different points. I prefer to have one common.. but.. don't know how to achieve it.
Now all files under are visible.

To be honest I don't understand why I was not able to see files inside those all partitions and at the same time I saw directories structure of it.
Maybe some file permissions of the parent directory - but I tried to change it with

Code:

chown nobody:nogroup

and

Code:

chmod 0777

.
Maybe some mount permission in

Code:

/etc/fstab

Maybe some other

Code:

/etc/exports

parameters [1]:

Quote:

nohide
This option is based on the option of the same name provided in IRIX NFS. Normally, if a server exports two filesystems one of which is mounted on the other, then the client will have to mount both filesystems explicitly to get access to them. If it just mounts the parent, it will see an empty directory at the place where the other filesystem is mounted. That filesystem is "hidden".

Setting the nohide option on a filesystem causes it not to be hidden, and an appropriately authorised client will be able to move from the parent to that filesystem without noticing the change.
However, some NFS clients do not cope well with this situation as, for instance, it is then possible for two files in the one apparent filesystem to have the same inode number.

The nohide option is currently only effective on single host exports. It does not work reliably with netgroup, subnet, or wildcard exports.

This option can be very useful in some situations, but it should be used with due care, and only after confirming that the client system copes with the situation effectively.

The option can be explicitly disabled with hide.

But I tried both configurations [nohide, hide].

[1] https://linux.die.net/man/5/exports

ondoho · 03-02-2020, 01:48 AM

You might want to check this wiki - has helped me when I set it up.

bischop · 03-02-2020, 09:19 AM

Quote:

Originally Posted by ondoho

You might want to check this wiki - has helped me when I set it up.

I initially glanced at the contents ... and there seems to be a solution. I will do the test and write back.

bischop · 03-03-2020, 06:54 PM

That help in my case:

Code:

/etc/exports

Code:

/mnt/shared        192.168.1.0/24(rw,sync,crossmnt,fsid=0)

The crossmnt option is necessary to share exported directories inside an exported directory.

jpollard · 03-03-2020, 09:48 PM

Just a note... making everything 777 removes all security from the filesystem. And for a SAMBA export, that can be a disaster as it is how ransomeware takes over.

ondoho · 03-07-2020, 02:00 AM

^ yes, this needs to be stressed.
bischop, now that you figured out what went wrong, change all that 0777 stuff back to normal values (probably just remove those config instructions and go with default values?).

bischop · 03-23-2020, 05:52 PM

Well, I understand the problem with 777 clearly so now - yes - I can remove it.