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added output of showmount command
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puk
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EDIT2: Issuing the below commands on the RaspberryPi client generate different results.

showmount -a 192.168.1.102
showmount -e 192.168.1.102

output:

All mount points on 192.168.1.102:
192.168.1.109:/home/USER/xyz

Export list for 192.168.1.102:
/home/USER/xyz              192.168.1.109
/home/USER/Documents/raspi/raspi1 192.168.1.109

EDIT2: Issuing the below commands on the RaspberryPi client generate different results.

showmount -a 192.168.1.102
showmount -e 192.168.1.102

output:

All mount points on 192.168.1.102:
192.168.1.109:/home/USER/xyz

Export list for 192.168.1.102:
/home/USER/xyz              192.168.1.109
/home/USER/Documents/raspi/raspi1 192.168.1.109
Added additional information on things I have tried out
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puk
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EDIT: If I try to export and then mount a different folder, lets say /home/USER/xyz to /home/raspi1/xyz, it works out as expected, with the file/folder owners being raspi1.

EDIT: If I try to export and then mount a different folder, lets say /home/USER/xyz to /home/raspi1/xyz, it works out as expected, with the file/folder owners being raspi1.

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puk
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NFS only gives user read access

I had NFS set up such that my RasberryPi had its Documents/ folder stored on my main Ubuntu system and it worked fine. I then made it such that the entire /home/raspi1 folder (note, not /home/ itself) was stored on my Ubuntu NFS server. However, now I no longer have write access to those files/folders.

Here is my exports file on my Ubuntu server. 192.168.1.109 is the internal ip address of my Raspberry Pi client.

/etc/exports (server):

/home/USER/Documents/raspi/raspi1 192.168.1.109(rw,sync,no_subtree_check,no_root_squash)

Here is the fstab file on my Raspberry Pi client. 192.168.1.102 is the internal ip address of my Ubuntu Server.

/etc/fstab (client):

192.168.1.102:/home/USER/Documents/raspi/raspi1 /home/raspi1 nfs rsize=8192,wsize=8192,rw,auto,nolock

After which, on the server, I issue the command

sudo exportfs -a

Now, when I log into my Raspberry Pi, and issue the command ls -l /home/raspi1, I get the following output

Output:

total 88
drwxrwxr-x 13 4294967294 4294967294  4096 Oct  2 04:33 .
drwxr-xr-x  4 root       root        4096 Oct  2 03:46 ..
-rw-r--r--  1 4294967294 4294967294  3390 Oct  2 04:32 .bashrc
drwxr-xr-x  2 4294967294 4294967294  4096 Oct  2 03:44 bin
drwxr-xr-x  3 4294967294 4294967294  4096 Oct  2 03:44 camcv
drwxr-xr-x  3 4294967294 4294967294  4096 Oct  2 03:44 camcv.step4
drwxr-xr-x  3 4294967294 4294967294  4096 Oct  2 03:44 camcv.step5
drwxr-xr-x  3 4294967294 4294967294  4096 Oct  2 03:44 camcv.step5.5
drwxr-xr-x  3 4294967294 4294967294  4096 Oct  2 03:44 camcv.step6
-rw-r--r--  1 4294967294 4294967294   475 Oct  2 04:32 .inputrc
drwxr-xr-x  4 4294967294 4294967294  4096 Oct  2 03:44 magicMirror
drwxr-xr-x  5 4294967294 4294967294  4096 Oct  2 03:44 media
drwxr-xr-x  3 4294967294 4294967294  4096 Oct  2 03:44 motionDetection
-rw-r--r--  1 4294967294 4294967294   675 Oct  2 04:32 .profile
drwx------  2 4294967294 4294967294  4096 Oct  2 04:33 .ssh
drwxr-xr-x 21 4294967294 4294967294  4096 Oct  2 04:34 .vim
-rw-r--r--  1 4294967294 4294967294 21938 Oct  2 04:33 .vimrc

Who is user 4294967294 and what has gone wrong here?