zettabrain-rag 0.4.6

Local private RAG pipeline with GUI — LangChain + Ollama + ChromaDB + NFS

ZettaBrain RAG

Local private RAG pipeline — your documents, your hardware, zero cloud.

Chat with your documents using a fully local AI. No API keys. No data leaving your machine. Runs on your own server or laptop with a secure HTTPS web GUI.

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Quick Install

curl -fsSL https://zettabrain.app/install.sh | sudo bash

Alternative mirror:

curl -fsSL https://install.zettabrain.io | sudo bash

What the installer does:

• Detects your OS (Ubuntu, Debian, Amazon Linux, RHEL, Fedora)
• Installs Python 3.9+ and system dependencies
• Installs zettabrain-rag via pipx (isolated, no virtualenv management needed)
• Installs and starts Ollama
• Pulls the nomic-embed-text embedding model (~275 MB)

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Install via pipx (developers)

# Install pipx if you don't have it
apt install -y pipx          # Ubuntu / Debian
brew install pipx            # macOS

# Install ZettaBrain
pipx install zettabrain-rag

# Verify
zettabrain --version

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First-time setup

1. Run setup wizard

sudo zettabrain-setup

Configures storage (Local / NFS / SMB), selects an LLM model based on your hardware, and enables HTTPS.

2. Launch the web GUI

zettabrain-server

Open https://local.zettabrain.app:7860 in your browser — trusted HTTPS, fully private.

3. Or use the CLI chat

zettabrain-chat

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Commands

Command	Description
sudo zettabrain-setup	Storage wizard + model selection + TLS cert
zettabrain-server	Launch secure HTTPS web GUI (port 7860)
zettabrain-chat	Interactive RAG chat in the terminal
zettabrain-chat --rebuild	Rebuild vector store then start chat
zettabrain-chat --debug	Show retrieved chunks on every query
zettabrain-ingest	Ingest documents into the vector store
zettabrain-ingest --folder /path	Ingest a specific folder
zettabrain-ingest --file /path/doc.pdf	Ingest a single file
zettabrain-ingest --stats	Show what is in the vector store
zettabrain-ingest --clear	Wipe the vector store
zettabrain-status	Show install paths, cert info, and store statistics
sudo zettabrain-storage add	Add a new storage source after initial setup
zettabrain-storage list	List configured storage sources

CLI chat commands

While inside zettabrain-chat:

Type	Action
Any question	Query your documents
sources	Show which document chunks were used
timing	Show retrieve / generate time for all queries this session
debug on	Show retrieved chunks on every query
debug off	Hide debug output
quit	Exit

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System requirements

	Minimum	Recommended
RAM	8 GB	16 GB
CPU	4 cores / 2.5 GHz	8 cores / 3.0 GHz
Disk	20 GB free	50 GB free
OS	Ubuntu 22.04 / Debian 12	Ubuntu 22.04 LTS
Python	3.9	3.11+

Why 8 GB minimum: llama3.1:8b (Q4) needs ~5 GB in RAM, plus ~2 GB for OS + Python + ChromaDB. Below 8 GB you will hit swap and responses can take 5+ minutes.

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GPU & model selection

Ollama auto-detects your GPU on install — NVIDIA (CUDA), AMD (ROCm), and Apple Silicon (Metal). No configuration needed beyond having the correct drivers installed.

sudo zettabrain-setup detects your hardware and presents a model menu:

Hardware detected: NVIDIA GeForce RTX 3080 (10GB VRAM)
Recommended model: llama3.1:8b  (10GB VRAM detected: balanced quality/speed)

  Available models:
    1) llama3.2:3b    — fastest (~2GB)        good for quick Q&A
    2) llama3.1:8b    — balanced (~5GB)       recommended for most   ← default
    3) mistral:7b     — fast (~4GB)           strong reasoning
    4) llama3.1:13b   — better (~8GB)         needs 12GB+ VRAM/RAM
    5) qwen2.5:14b    — excellent (~9GB)      needs 16GB+ VRAM/RAM
    6) qwen2.5:32b    — best quality (~20GB)  needs 24GB+ VRAM/RAM
    7) Custom

You can also switch model at any time by editing /opt/zettabrain/src/zettabrain.env:

ZETTABRAIN_LLM_MODEL=qwen2.5:14b

Then restart the server: zettabrain-server

Performance reference

Approximate response time for a 300-token answer ("What is cloud computing?"):

Hardware	Model	Tokens/sec	Response time
4-core CPU, 8 GB RAM	llama3.2:3b	8–15 t/s	20–40 s
8-core CPU, 16 GB RAM	llama3.1:8b	5–12 t/s	25–60 s
NVIDIA RTX 3060 (8 GB)	llama3.1:8b	60–90 t/s	3–5 s
NVIDIA RTX 3080 (10 GB)	llama3.1:8b	80–120 t/s	2–4 s
Apple M2 (16 GB)	llama3.1:8b	30–50 t/s	6–10 s

The web UI and CLI both show per-query timing: retrieve time, generate time, and delta vs previous query.

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Retrieval pipeline

ZettaBrain uses a hybrid retrieval approach for accuracy:

1. Adaptive chunking — chunk size tuned per document type (PDF / DOCX / TXT) and text density
2. MMR semantic search — Maximum Marginal Relevance via ChromaDB (diversity + relevance)
3. BM25 keyword search — exact term matching on the same corpus
4. Merge & deduplicate — semantic results ranked first, duplicates removed by content hash
5. Cross-encoder re-ranking — FlashRank (ms-marco-MiniLM-L-12-v2) picks the best chunks before sending to the LLM

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Supported document formats

.pdf .txt .md .docx

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Configuration

All settings can be overridden via environment variables or /opt/zettabrain/src/zettabrain.env:

Variable	Default	Description
ZETTABRAIN_DOCS	/opt/zettabrain/data	Documents folder
ZETTABRAIN_CHROMA	/opt/zettabrain/src/zettabrain_vectorstore	ChromaDB path
ZETTABRAIN_LLM_MODEL	llama3.1:8b	Ollama LLM model
ZETTABRAIN_EMBED_MODEL	nomic-embed-text	Ollama embedding model
ZETTABRAIN_CHUNK_SIZE	1000 (PDF) / 800 (TXT)	Chunk size (adaptive)
ZETTABRAIN_CHUNK_OVERLAP	150 (PDF) / 100 (TXT)	Chunk overlap (adaptive)
OLLAMA_HOST	http://localhost:11434	Ollama API endpoint

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Diagnostics

# Full status — version, certs, vector store stats
zettabrain-status

# Verify ChromaDB is working
python3 /opt/zettabrain/src/01_chromadb_setup.py

# Verify embedding model is working
python3 /opt/zettabrain/src/02_embeddings_test.py

# Check Ollama is running
curl http://localhost:11434

# List downloaded models
ollama list

# View server logs
journalctl -u zettabrain -f

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Uninstall

pipx install

pipx uninstall zettabrain-rag
sudo rm -rf /opt/zettabrain

One-line installer

pipx uninstall zettabrain-rag
sudo rm -rf /opt/zettabrain /var/log/zettabrain-install.log
sudo systemctl disable --now zettabrain 2>/dev/null || true

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Contributors

@olajide-zettabrain	Creator & maintainer

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License

MIT — © ZettaBrain