Add Jellyfin + macOS: Persistent NFS Mount documentation
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Nikholas Pcenicni
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macos/Jellyfin-NFS.md
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macos/Jellyfin-NFS.md
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# Jellyfin + macOS: Persistent NFS Mount (Fix for Libraries Randomly “Clearing”)
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This README documents the working fix I applied when Jellyfin (on a Mac mini) periodically “lost” or cleared my Movies/TV libraries that live on a NAS mounted over NFS.
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It includes the exact commands, files, and rationale so I can reproduce it later.
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---
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## Problem Summary
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- Symptom: Every day or two, Jellyfin showed empty Movies/TV libraries.
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- Media location: NFS share at `/Volumes/media` from NAS `192.168.50.105:/media`.
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- Root cause: macOS was using autofs (`/- /etc/auto_nfs`). autofs can unmount after inactivity or brief network blips. When the mount disappears during a Jellyfin scan/file-watch, Jellyfin sees files as missing and removes them from its DB.
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## Solution Summary
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- Stop using autofs for this path.
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- Create a persistent mount at boot using a LaunchDaemon and a small network‑aware mount script.
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- The script:
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- Is idempotent: does nothing if already mounted.
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- Checks NAS reachability first.
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- Logs to `/var/log/mount_media.(out|err)`.
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- Optionally restarts Jellyfin (Homebrew service) if the mount comes back.
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---
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## Prerequisites / Assumptions
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- macOS with admin (sudo) access.
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- NFS server: `192.168.50.105` exporting `/media` (adjust as needed).
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- Mount point: `/Volumes/media` (adjust as needed).
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- Jellyfin installed (optional Homebrew service restart in script).
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> Tip: If your NAS requires privileged source ports for NFSv4, `resvport` helps. The script falls back to `noresvport` if needed.
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---
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## Steps (copy/paste commands)
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### 1) Disable autofs for this path and unmount any automounted share
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```
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# Backup and comment out the direct map for NFS
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sudo cp /etc/auto_master /etc/auto_master.bak.$(date +%F_%H%M%S)
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sudo sed -i.bak 's|^/- /etc/auto_nfs|#/- /etc/auto_nfs|' /etc/auto_master
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# Reload automountd (will unmount /Volumes/media if it was automounted)
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sudo automount -vc
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# Ensure the mountpoint is not currently mounted (ignore errors if already unmounted)
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sudo umount /Volumes/media 2>/dev/null || sudo umount -f /Volumes/media 2>/dev/null || true
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```
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> Note: If `chown`/`chmod` say “Operation not permitted,” the path is still mounted (or your NAS has root-squash). Unmount first.
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---
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### 2) Create the network‑aware mount script
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```
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sudo mkdir -p /usr/local/sbin
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sudo tee /usr/local/sbin/mount_media_nfs.sh > /dev/null <<'SH'
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#!/bin/sh
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set -eu
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LOG="/var/log/mount_media.out"
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ERR="/var/log/mount_media.err"
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MOUNT="/Volumes/media"
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SERVER="192.168.50.105:/media"
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HOST="${SERVER%%:*}"
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# Ensure mountpoint exists
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[ -d "$MOUNT" ] || mkdir -p "$MOUNT"
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# If already mounted as NFS, exit quietly
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if mount -t nfs | awk '{print $3}' | grep -qx "$MOUNT"; then
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echo "$(date) already mounted: $MOUNT" >>"$LOG"
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exit 0
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fi
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# Preflight: only try to mount when NFS port is reachable
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if ! /usr/bin/nc -G 2 -z "$HOST" 2049 >/dev/null 2>&1; then
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echo "$(date) NAS not reachable on 2049, skipping mount" >>"$LOG"
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exit 0
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fi
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echo "$(date) mounting $SERVER -> $MOUNT" >>"$LOG"
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/sbin/mount -t nfs -o resvport,hard,nfsvers=4.0 "$SERVER" "$MOUNT" >>"$LOG" 2>>"$ERR" || \
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/sbin/mount -t nfs -o noresvport,hard,nfsvers=4.0 "$SERVER" "$MOUNT" >>"$LOG" 2>>"$ERR"
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# Verify mount succeeded via mount(8)
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if mount -t nfs | awk '{print $3}' | grep -qx "$MOUNT"; then
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echo "$(date) mount OK: $MOUNT" >>"$LOG"
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# Optional: restart Jellyfin if installed via Homebrew
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if command -v brew >/dev/null 2>&1 && brew services list | grep -q '^jellyfin\b'; then
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echo "$(date) restarting Jellyfin (brew services)" >>"$LOG"
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brew services restart jellyfin >>"$LOG" 2>>"$ERR" || true
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fi
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else
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echo "$(date) mount FAILED" >>"$ERR"
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exit 1
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fi
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SH
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sudo chmod 755 /usr/local/sbin/mount_media_nfs.sh
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```
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---
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### 3) Create the LaunchDaemon (mount at boot, re-check periodically, network‑aware)
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```
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sudo tee /Library/LaunchDaemons/com.local.mountmedia.plist > /dev/null <<'PLIST'
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>Label</key>
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<string>com.local.mountmedia</string>
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<key>ProgramArguments</key>
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<array>
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<string>/usr/local/sbin/mount_media_nfs.sh</string>
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</array>
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<key>RunAtLoad</key>
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<true/>
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<key>StartInterval</key>
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<integer>300</integer>
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<key>KeepAlive</key>
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<dict>
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<key>NetworkState</key>
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<true/>
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</dict>
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<key>StandardOutPath</key>
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<string>/var/log/mount_media.out</string>
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<key>StandardErrorPath</key>
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<string>/var/log/mount_media.err</string>
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</dict>
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</plist>
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PLIST
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sudo chown root:wheel /Library/LaunchDaemons/com.local.mountmedia.plist
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sudo chmod 644 /Library/LaunchDaemons/com.local.mountmedia.plist
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sudo plutil -lint /Library/LaunchDaemons/com.local.mountmedia.plist
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sudo launchctl bootout system /Library/LaunchDaemons/com.local.mountmedia.plist 2>/dev/null || true
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sudo launchctl bootstrap system /Library/LaunchDaemons/com.local.mountmedia.plist
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sudo launchctl enable system/com.local.mountmedia
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sudo launchctl kickstart -k system/com.local.mountmedia
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```
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---
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### 4) Run once and verify
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```
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# Run once now (idempotent; logs "already mounted" if present)
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sudo /usr/local/sbin/mount_media_nfs.sh
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# LaunchDaemon status
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sudo launchctl print system/com.local.mountmedia | egrep 'state|last exit|PID' || true
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# Mount status (should NOT say "automounted")
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mount | grep " on /Volumes/media "
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# NFS mount parameters
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nfsstat -m | sed -n '/\/Volumes\/media/,+12p'
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# Script logs
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tail -n 100 /var/log/mount_media.out /var/log/mount_media.err 2>/dev/null || true
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```
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---
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### 5) Jellyfin settings
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- Temporarily disable “Enable real-time monitoring” for libraries under `/Volumes/media` until you confirm the mount stays stable.
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- Then run “Scan Library Files” to repopulate anything previously removed.
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---
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### 6) Reboot test (recommended)
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```
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sudo shutdown -r now
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```
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After reboot:
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```
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mount | grep " on /Volumes/media " || echo "Not mounted yet"
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sudo launchctl print system/com.local.mountmedia | egrep 'state|last exit' || true
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tail -n 100 /var/log/mount_media.out /var/log/mount_media.err 2>/dev/null || true
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```
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---
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## Rationale for Key Choices
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- Persistent mount (LaunchDaemon) instead of autofs:
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- autofs can unmount after inactivity; Jellyfin then removes items it thinks are gone.
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- LaunchDaemon ensures the mount is present before scans and remains mounted.
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- NFS options:
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- `hard`: Blocks I/O until server responds, avoiding spurious “file missing” errors.
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- `nfsvers=4.0`: Matches typical NAS defaults and the client’s chosen version.
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- `resvport` then fallback `noresvport`: Some servers require privileged ports; the script tries both.
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- Network preflight:
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- Check TCP/2049 reachability to avoid “Network is unreachable” failures (exit code 51) at boot or during link flaps.
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- Logging:
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- `/var/log/mount_media.out` and `.err` make it easy to correlate with Jellyfin logs.
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---
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## Troubleshooting
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- “Operation not permitted” when `chown`/`chmod`:
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- The path is mounted over NFS, and root-squash likely prevents ownership changes from the client. Unmount first or change ownership on the NAS.
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- LaunchDaemon errors:
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- Validate plist: `sudo plutil -lint /Library/LaunchDaemons/com.local.mountmedia.plist`
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- Service state: `sudo launchctl print system/com.local.mountmedia`
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- Mount health:
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- `nfsstat -m` should show vers=4.0, hard, resvport/noresvport.
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- Network/power:
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- Prevent system sleep that drops the NIC; enable “Wake for network access.”
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---
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## Optional: If you must keep autofs
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Increase the autofs timeout so it doesn’t unmount on brief inactivity (less ideal than the LaunchDaemon approach):
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```
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sudo cp /etc/auto_master /etc/auto_master.bak.$(date +%F_%H%M%S)
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sudo sed -i.bak -E 's|^/-[[:space:]]+/etc/auto_nfs$|/- -timeout=604800 /etc/auto_nfs|' /etc/auto_master
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sudo automount -vc
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```
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---
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## Reverting
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To revert to autofs:
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```
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# Stop and remove LaunchDaemon
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sudo launchctl bootout system /Library/LaunchDaemons/com.local.mountmedia.plist
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sudo rm -f /Library/LaunchDaemons/com.local.mountmedia.plist
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# Restore /etc/auto_master (uncomment direct map) and reload
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sudo sed -i.bak 's|^#/- /etc/auto_nfs|/- /etc/auto_nfs|' /etc/auto_master
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sudo automount -vc
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```
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---
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## Notes
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- Change permissions/ownership on the NFS export from the NAS, not the macOS client (root-squash).
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- `showmount` may fail against NFSv4-only servers; it’s not needed here.
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- Adjust `SERVER`, `MOUNT`, and `StartInterval` to suit your environment.
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