HAProxy vs Nginx: Right Load Balancer
Compare architecture and ideal use cases.
HAProxy vs Nginx: Choosing the Right Load Balancer
Both HAProxy and Nginx are battle-tested load balancers used in production by millions of sites. But they have different architectures, strengths, and ideal use cases. Here's an honest comparison to help you choose.
Architecture Comparison
| Feature | HAProxy | Nginx |
|---|---|---|
| Primary purpose | Load balancer / proxy | Web server + reverse proxy |
| Layer support | L4 (TCP) + L7 (HTTP) | L7 (HTTP) primary, L4 stream module |
| Connection handling | Event-driven, single-threaded per process | Event-driven, multi-worker processes |
| Static content serving | No | Yes (excellent) |
| Built-in caching | No | Yes (proxy_cache) |
| Health checking | Advanced (agent checks, stick tables) | Basic (HTTP checks, Plus has advanced) |
| Configuration reload | Seamless (hitless reloads) | Graceful (worker shutdown/restart) |
| Stats dashboard | Built-in real-time stats page | Requires stub_status or Plus |
When to Choose HAProxy
- TCP/L4 load balancing (databases, Redis, MQTT)
- Advanced health checking and failover logic
- High-connection-count scenarios (100K+ concurrent)
- Detailed real-time traffic statistics
- Session persistence with stick tables
When to Choose Nginx
- Combined web server + reverse proxy
- Static content serving with caching
- HTTP/2, gRPC proxying, WebSocket support
- Kubernetes Ingress Controller
- API gateway with rate limiting
Our Recommendation
Use HAProxy as your primary load balancer for backend services, databases, and TCP traffic. Use Nginx as a reverse proxy for web applications, static content, and as a Kubernetes Ingress Controller. Many production architectures use both — Nginx in front for TLS and caching, HAProxy behind for sophisticated load balancing.
Eazy SaaS Tip: For Kubernetes environments, Nginx Ingress Controller is the de facto standard. For non-K8s environments or database load balancing, HAProxy is our go-to choice.