Issue with old user permissions and NFS

Here's what I did in a nutshell. Hope that helps.

# SMB → NFS Migration (UID/GID aligned)

* Problem: SMB does not reliably preserve timestamps → breaks rsync incremental backups

* Solution: switch to NFS with consistent UID/GID

---

# 0. Target State

* volker → UID 1000

* anja → UID 1001

* shared group: users (GID 100 on NAS + client)

* /data/Media → group RW (users)

* /home → per-user ownership

* NFS uses numeric IDs (must match!)

---

# 1. NAS Setup (RN214)

## Users

* Create:

* volker_new (UID 1000)

* anja_new (UID 1001)

* Trigger home creation via SMB login once

* Rename:

* old → *_old

* *_new → final names

## Fix ownership (/data/Media)

* chown -R --from=100:100 1000:100 /data/Media

* chown -R --from=101:100 1001:100 /data/Media

* cleanup check:

* find /data/Media -uid 100

* find /data/Media -uid 101

## Fix permissions

* chown -R :users /data/Media

* chmod -R 2775 /data/Media

## /home migration (if needed)

* move data or just:

* chown -R 1000:100 /data/home/volker

* chown -R 1001:100 /data/home/anja

* ensure ~/.ssh:

* chmod 700 ~/.ssh

* chmod 600 ~/.ssh/authorized_keys

## Final cleanup

* ensure no UID 100/101 left anywhere

---

# 2. Client Setup

## Group

* getent group users

* if missing: sudo groupadd -g 100 users

## Add users

* sudo usermod -aG users volker

* sudo usermod -aG users anja

* relog or newgrp users

## Install NFS + mount points

* sudo apt install nfs-common

* mkdir -p /media/rn214-Home

* mkdir -p /media/rn214-Media

---

# 3. NFS + fstab

## Enable on NAS

* /home → NFS on

* /data/Media → NFS on

* RW, async, root_squash, NO all_squash

## /etc/fstab

* rn214-volker:/home /media/rn214-Home nfs noauto,users,nfsvers=3 0 0

* rn214-volker:/data/Media /media/rn214-Media nfs noauto,users,async,nfsvers=3 0 0

* sudo systemctl daemon-reload

---

# 4. Test

* mount /media/rn214-Home

* mount /media/rn214-Media

## Verify IDs (IMPORTANT)

* ls -ln → must show:

* 1000 100

* 1001 100

## Write test

* touch + delete file → must work without sudo

---

# 5. rsync Migration (SMB → NFS)

## Copy

* rsync -aHAX --dry-run --no-xattrs --no-g /source/ /dest/

* rsync -aHAX --no-xattrs --no-g /source/ /dest/

## Verify

* rsync --dry-run again

* no output = perfect

## Finalize

* rename:

* user → user_old

* user_new → user

* test access

* delete old only after verification

---

# 6. Common Issues

* UID 100/101 still exist

→ migration incomplete

* permission denied

→ missing users group on client

* root issues

→ check NO all_squash