🛠️ Setting Up Fusio as an API Gateway for CRM & LLM Microservices

#python #crm #llm #opensource

Over the past few days, I’ve been working on integrating an open-source API management layer using Fusio (v5.2.3) to centralize and secure communication between our CRM and LLM-based applications.

🔍 Why Fusio?

Fusio provides a lightweight, flexible API gateway and management system with:

Visual interface for API operations
Built-in support for OAuth2, rate limiting, and request logging
Schema-driven API design
Real-time analytics & monitoring dashboards
It’s a great fit for internal service coordination, especially when you're running microservices for systems like:
Customer Relationship Management (CRM)
Large Language Model (LLM) integration APIs

⚙️ What I Set Up
🚀 API Gateway Layer between multiple services (CRM-Core, CRM-MatchMaker, LLM engine)
🧩 Defined operations, actions, and routes inside Fusio to handle each microservice endpoint
🔐 Centralized access control and token handling
📈 Enabled real-time metrics for test coverage, error rate, usage per operation, and latency

🧪 Testing & Challenges

✅ Successfully simulated and monitored traffic between internal endpoints
🐛 Faced and fixed a persistent MySQL connection issue while spinning up the Fusio container (lesson: always verify DB port exposure + credentials in .env)
🔄 Used docker-compose to manage isolated services, with volume resets during setup retries


# Used this command combo to reset and re-run the setup
docker-compose down -v
sudo rm -rf ./db
docker-compose up -d

✅ What’s Next

Finalizing integration with the production application layer
Setting up WebSocket event streaming for real-time updates
Deploying Fusio on a cloud server for internal + external access

💡 Final Thoughts

Fusio is a powerful open-source tool that gives devs full control over API lifecycle management — without depending on heavy SaaS solutions. For internal microservice architectures, especially with real-time and AI-driven logic like CRM + LLM, it’s proving to be a great fit.