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# Nova Required Services Connection Guide
## Service Matrix
| Service | Port | Purpose | Status |
|---------|------|---------|---------|
| PostgreSQL | 5432 | Structured data | ✅ Operational |
| MongoDB | 27017 | Document storage | ✅ Operational |
| ChromaDB | 8000 | Semantic memory | ✅ Operational |
| Redis (Default) | 6379 | Working memory | ✅ Operational |
## PostgreSQL Connection
```bash
# Connect to PostgreSQL
psql -h localhost -p 5432 -U postgres
# List databases
\l
# Basic SQL
SELECT version();
CREATE DATABASE nova_core;
```
**Python Example:**
```python
import psycopg2
conn = psycopg2.connect(
host="localhost",
port=5432,
user="postgres",
database="nova_core"
)
cur = conn.cursor()
cur.execute("SELECT NOW();")
print(f"PostgreSQL time: {cur.fetchone()}")
```
## MongoDB Connection
```bash
# Connect to MongoDB
mongosh --port 27017
# Show databases
show dbs
# Use nova database
use nova
# Basic operations
db.sessions.insertOne({session_id: "test", data: {}})
```
**Python Example:**
```python
from pymongo import MongoClient
client = MongoClient("localhost", 27017)
db = client.nova
collection = db.sessions
# Insert document
result = collection.insert_one({
"session_id": "test_123",
"timestamp": "2025-08-24",
"data": {"status": "active"}
})
print(f"Inserted ID: {result.inserted_id}")
```
## ChromaDB Connection
```bash
# Health check
curl http://localhost:8000/api/v1/heartbeat
# List collections
curl http://localhost:8000/api/v1/collections
```
**Python Example:**
```python
import chromadb
client = chromadb.HttpClient(host="localhost", port=8000)
# Create collection
collection = client.create_collection("nova_memories")
# Add embeddings
collection.add(
documents=["Memory example 1", "Memory example 2"],
metadatas=[{"type": "fact"}, {"type": "experience"}],
ids=["id1", "id2"]
)
# Query similar memories
results = collection.query(
query_texts=["example memory"],
n_results=2
)
print(f"Similar memories: {results}")
```
## Health Monitoring
```bash
# PostgreSQL
pg_isready -h localhost -p 5432
# MongoDB
mongosh --eval "db.adminCommand('ping')" --quiet
# ChromaDB
curl -s http://localhost:8000/api/v1/heartbeat | jq .
```
## Security Notes
- ❗ All services bound to localhost only
- ❗ No authentication configured (development)
- ❗ Regular backup procedures needed
- ❗ Monitor disk usage on /data partition
- ❗ Consider adding authentication for production
---
**Last Updated:** September 4, 2025 |