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LazyLibrarian

🟢 Media Service

📋 Service Overview

Property Value
Service Name lazylibrarian
Host Atlantis (Synology)
Category Media / Books
Difficulty 🟡
Docker Image lscr.io/linuxserver/lazylibrarian:latest
Compose File hosts/synology/atlantis/arr-suite/docker-compose.yml
Directory hosts/synology/atlantis/arr-suite

🎯 Purpose

LazyLibrarian is an ebook and audiobook download automation tool, similar to Sonarr/Radarr but for books. It monitors authors you follow, searches indexers for new releases, and automatically downloads them via SABnzbd or torrent clients. This is the replacement for the retired Readarr project.

🚀 Quick Start

Prerequisites

  • Docker and Docker Compose installed
  • Download client configured (SABnzbd and/or Deluge)
  • Indexer access (via Prowlarr or direct)
  • Access to the host system (Atlantis)

Deployment

# Navigate to service directory
cd hosts/synology/atlantis/arr-suite

# Start the service
docker-compose -f docker-compose.yml up -d lazylibrarian

# Check service status
docker-compose -f docker-compose.yml ps

# View logs
docker-compose -f docker-compose.yml logs -f lazylibrarian

🔧 Configuration

Docker Compose Configuration

lazylibrarian:
  image: lscr.io/linuxserver/lazylibrarian:latest
  container_name: lazylibrarian
  environment:
    - PUID=1029
    - PGID=100
    - TZ=America/Los_Angeles
    - UMASK=022
    - DOCKER_MODS=ghcr.io/themepark-dev/theme.park:lazylibrarian|ghcr.io/linuxserver/mods:lazylibrarian-calibre
    - TP_SCHEME=http
    - TP_DOMAIN=192.168.0.200:8580
    - TP_THEME=dracula
  volumes:
    - /volume2/metadata/docker2/lazylibrarian:/config
    - /volume1/data:/data
    - /volume3/usenet:/sab
    - /volume2/torrents:/downloads  # Deluge download dir
    - /volume2/metadata/docker2/lazylibrarian-scripts/custom-cont-init.d:/custom-cont-init.d
  ports:
    - "5299:5299"
  networks:
    media2_net:
      ipv4_address: 172.24.0.5
  security_opt:
    - no-new-privileges:true
  restart: always

Environment Variables

Variable Value Description
PUID 1029 User ID for file permissions
PGID 100 Group ID for file permissions
TZ America/Los_Angeles Timezone setting
UMASK 022 File permission mask
DOCKER_MODS ...theme.park:lazylibrarian|...mods:lazylibrarian-calibre Theme.park + Calibre (ebook-convert)
TP_SCHEME http Theme.park scheme
TP_DOMAIN 192.168.0.200:8580 Theme.park host
TP_THEME dracula Theme selection

Port Mappings

Host Port Container Port Protocol Purpose
5299 5299 TCP Web UI

Volume Mappings

Host Path Container Path Type Purpose
/volume2/metadata/docker2/lazylibrarian /config bind Configuration files
/volume1/data /data bind Media library root
/volume3/usenet /sab bind Download directory

🌐 Access Information

Interface URL
Web UI http://192.168.0.200:5299

🔧 Initial Setup

1. Download Clients

SABnzbd Configuration:

Setting Value
Host 192.168.0.200
Port 8080
API Key (from SABnzbd → Config → General)
Category books

Deluge Configuration (via Gluetun):

Setting Value
Host 172.24.0.20
Port 8112
Password (your deluge password)

2. Providers (Indexers)

Using Prowlarr (Recommended):

Setting Value
Host 172.24.0.6
Port 9696
API Key (from Prowlarr → Settings → General)

3. Processing Paths

Setting Value
eBook Library Folder /data/media/ebooks
AudioBook Library Folder /data/media/audiobooks
Download Complete Folder /sab/complete

📖 Adding Books

Via the Web UI

  1. Authors → Add Author → search by name → set to Active to track all their books
  2. Books → find the book → click Wanted to queue it for download
  3. LL searches indexers automatically on schedule (every 6h) or trigger manually: Tools → Search Wanted

API Access

Field Value
URL http://192.168.0.200:5299
API Key REDACTED_LL_API_KEY
Config file /volume2/metadata/docker2/lazylibrarian/config.ini (on Atlantis)

Useful read/write CFG shortcuts:

# Read a config value
curl "http://192.168.0.200:5299/api?apikey=REDACTED_LL_API_KEY&cmd=readCFG&name=<NAME>&group=<Group>"

# Write a config value
curl "http://192.168.0.200:5299/api?apikey=REDACTED_LL_API_KEY&cmd=writeCFG&name=<NAME>&group=<Group>&value=<val>"

Via API

LL_API="http://192.168.0.200:5299/api?apikey=REDACTED_LL_API_KEY"

# 1. Find the book — returns bookid and authorid
curl "$LL_API&cmd=findBook&name=Book+Title+Author+Name"

# 2. Add it to the database
curl "$LL_API&cmd=addBook&id=<bookid>&wait=1"

# 3. Mark as Wanted (type=eBook or type=AudioBook)
curl "$LL_API&cmd=queueBook&id=<bookid>&type=eBook"

# 4. Trigger immediate search (don't wait 6h)
curl "$LL_API&cmd=forceBookSearch&type=eBook"

Language filter warning

LL may log Language [Unknown] does not match preference for some books — this is a warning only and does not block the download. The book will still be grabbed.

Flow after download

SABnzbd downloads → LL post-processor imports to library folder → Audiobookshelf watcher detects → available in ABS app.

🔒 Security Considerations

  • ✅ Security options configured (no-new-privileges)
  • ✅ Running with specific user/group IDs
  • ✅ Theme.park integration for consistent UI

📊 Resource Requirements

Recommended Resources

  • Minimum RAM: 256MB
  • Recommended RAM: 512MB
  • CPU: 1 core minimum
  • Storage: Varies by library size

Resource Monitoring

docker stats lazylibrarian

🚨 Troubleshooting

Common Issues

Prowlarr reports "Applications unavailable due to failures" for LazyLibrarian

  • Root cause: LazyLibrarian's API is disabled by default. Prowlarr requires the API to sync indexers.
  • Fix: In LazyLibrarian → Config → General, enable the API and save. Copy the API key. In Prowlarr → Settings → Apps → LazyLibrarian, ensure the API key matches, then click Test.
  • Error seen in Prowlarr logs: LazyLibrarianException: LazyLibrarian Error - Code 501: API not enabled

Searches complete instantly with "found 0 books"

  • Root cause: Newznab/Torznab providers are disabled by default (ENABLED = False in source). The config.ini must have enabled = true explicitly in each provider section.
  • Fix: Stop the container, add enabled = true as the first key under each [Newznab_N] and [Torznab_N] section in /config/config.ini, then restart. 
    docker stop lazylibrarian
python3 /tmp/fix_ll_config.py   # see script below
docker start lazylibrarian
    Script (/tmp/fix_ll_config.py): 
    import re
path = "/volume2/metadata/docker2/lazylibrarian/config.ini"
with open(path) as f: lines = f.readlines()
out = []
for i, line in enumerate(lines):
    out.append(line)
    if re.match(r"^\[(Newznab|Torznab)_\d+\]\s*$", line):
        j = i + 1
        if not any(re.match(r"^enabled\s*=", l, re.I) for l in lines[j:j+10] if not l.startswith("[")):
            out.append("enabled = true\n")
with open(path, "w") as f: f.writelines(out)

SABnzbd download stuck in "Grabbing" forever / Torrent grab fails with [Errno 2]

  • Root cause: Newznab/Torznab provider hosts use the Docker container name (prowlarr:9696). SABnzbd runs on the host network and can't resolve it; torrent grabs silently fail when LL can't reach the Prowlarr download URL, leaving it trying to open the result title as a file path.
  • Fix: Stop the container, replace prowlarr:9696 with 192.168.0.200:9696 in ALL provider host entries (Newznab and Torznab), then restart. 
    # Via Portainer API (container stop/start):
curl -sk -X POST -H "X-API-Key: <portainer-token>" \
  "https://192.168.0.200:9443/api/endpoints/2/docker/containers/<id>/stop"
ssh atlantis "sed -i 's|http://prowlarr:9696/|http://192.168.0.200:9696/|g' \
  /volume2/metadata/docker2/lazylibrarian/config.ini"
curl -sk -X POST -H "X-API-Key: <portainer-token>" \
  "https://192.168.0.200:9443/api/endpoints/2/docker/containers/<id>/start" -H "Content-Type: application/json" -d '{}'

SABnzbd not configured / "No NZB download method is enabled"

  • Root cause: SABnzbd connection not set up in LazyLibrarian.
  • Fix: Use the writeCFG API (or Config → Downloaders → SABnzbd in the UI): 
    LL_API="http://192.168.0.200:5299/api?apikey=<your-key>"
curl "$LL_API&cmd=writeCFG&name=SAB_HOST&group=SABnzbd&value=192.168.0.200"
curl "$LL_API&cmd=writeCFG&name=SAB_PORT&group=SABnzbd&value=8080"
curl "$LL_API&cmd=writeCFG&name=SAB_API&group=SABnzbd&value=<sab-api-key>"
curl "$LL_API&cmd=writeCFG&name=SAB_CAT&group=SABnzbd&value=books"
curl "$LL_API&cmd=writeCFG&name=NZB_DOWNLOADER_SABNZBD&group=USENET&value=1"
    SABnzbd API key: docker exec sabnzbd grep api_key /config/sabnzbd.ini

eBook library path not set / books import to /config

  • Root cause: EBOOK_DIR defaults to empty, so imported books land in /config.
  • Fix: Set the library path: 
    curl "http://192.168.0.200:5299/api?cmd=writeCFG&name=EBOOK_DIR&group=General&value=/data/media/ebooks&apikey=<key>"
    Or in UI: Config → Processing → eBook Library Folder → /data/media/ebooks

AudioBook library path not set / audiobooks import to /config

  • Root cause: AUDIO_DIR defaults to empty, so imported audiobooks land in /config instead of the Audiobookshelf-watched directory.
  • Fix: Set the library path: 
    curl "http://192.168.0.200:5299/api?cmd=writeCFG&name=AUDIO_DIR&group=General&value=/data/media/audiobooks&apikey=<key>"
    Or in UI: Config → Processing → AudioBook Library Folder → /data/media/audiobooks Verify: curl "http://192.168.0.200:5299/api?apikey=<key>&cmd=readCFG&name=AUDIO_DIR&group=General"

Torrent download fails with [Errno 2] No such file or directory: '<result title>'

  • Root cause: LL's deluge.py identifies valid .torrent data by checking for b'announce' in the first 40 bytes. Tracker-less torrents (generated from magnet links by clients like go.torrent) start with d7:comment instead, causing LL to fall back to treating the result title as a local file path.
  • Fix: A custom-cont-init.d script patches deluge.py on startup to also accept bencoded dicts (any data starting with d, which all valid .torrent files do). The patch and compose mount are already applied. Script at: /volume2/metadata/docker2/lazylibrarian-scripts/custom-cont-init.d/99-patch-deluge.sh

SAB_DIRECTORY cannot be set via writeCFG API

  • Root cause: writeCFG returns OK but SAB_DIRECTORY is not written to config.ini by some LL versions (possible key mismatch). LL won't know where SABnzbd puts completed downloads and won't auto-import them.
  • Workaround: Manually trigger post-processing after a download completes: 
    curl "http://192.168.0.200:5299/api?apikey=REDACTED_LL_API_KEY&cmd=forceProcess&dir=/sab/complete/books"
    This tells LL to scan the SABnzbd books category output dir and import any completed files.

KEEP_SEEDING setting does not persist

  • Root cause: writeCFG returns OK for KEEP_SEEDING but the value is not actually saved. Manually editing config.ini also fails — LL reads config into memory at startup and writes it back on shutdown, overwriting manual edits made while the container is running.
  • Workaround: None found. The setting must be changed through the LL web UI (Config → Processing → Keep seeding after import), which writes it to the in-memory config.

NZB audiobook downloads deliver ebooks (epub/mobi) instead of audio files (m4b/mp3)

  • Root cause: Some Prowlarr indexers (especially 1337x) classify audio releases under NZB categories. LL searches both NZB and Torznab for AudioBooks. An indexer may have an epub labeled as an audiobook at a high match percentage, and LL grabs it. The epub lands in the audiobook directory and is ignored by Audiobookshelf.
  • Fix: If an audiobook download is an epub, check docker logs lazylibrarian for the grabbed URL, then mark the book as Wanted again and re-search. If the NZB result keeps winning, you may need to add the specific provider to a blocklist or manually grab a torrent via the UI.

Downloads not starting

  • Verify download client connection in Config → Downloaders
  • Check API keys are correct
  • Ensure indexers are configured and working

Books not importing

  • Check file permissions (PUID/PGID)
  • Verify library paths are correct
  • Manually trigger PostProcessor: curl "$LL_API&cmd=forceProcess&dir=/sab/complete/books"

Metadata not found

  • Try different metadata providers (Google Books, OpenLibrary, etc.)
  • Search by ISBN if available
  • Manual metadata entry

Useful Commands

# View real-time logs
docker logs -f lazylibrarian

# Restart service
docker restart lazylibrarian

# Update service
docker pull lscr.io/linuxserver/lazylibrarian:latest
docker restart lazylibrarian

# Access service shell
docker exec -it lazylibrarian /bin/bash

📚 Additional Resources

🔗 Related Services

Services REDACTED_APP_PASSWORD LazyLibrarian:

  • Audiobookshelf (playback/serving)
  • Calibre-Web (ebook management)
  • SABnzbd (usenet downloads)
  • Deluge (torrent downloads)
  • Prowlarr (indexer management)

Last Updated: 2026-03-02 (Calibre mod, torrent patch, troubleshooting updates) Configuration Source: hosts/synology/atlantis/arr-suite/docker-compose.yml

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