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HAProxy

HAProxy is a reliable, high-performance TCP/HTTP load balancer and proxy server. It's widely used in high-availability environments and is known for its excellent performance, advanced load balancing algorithms, and comprehensive health checking capabilities.

Key Features

Advanced Load Balancing

Multiple algorithms including round-robin, least connections, source IP hash, and more.

Health Checking

Comprehensive health checking with multiple check methods and customizable intervals.

High Performance

Event-driven architecture handling millions of requests per second.

SSL/TLS Termination

Full SSL/TLS support with SNI, OCSP stapling, and session resumption.

Use Cases

Load Balancing: Distributing traffic across multiple backend servers
High Availability: Failover and redundancy for critical services
SSL Termination: Offloading SSL/TLS processing from backend servers
Traffic Management: Rate limiting, content switching, and request routing
API Gateway: Managing API traffic and routing

Configuration Example

Basic HAProxy configuration:

global
    daemon
    maxconn 4096

defaults
    mode http
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms

frontend http-in
    bind *:80
    default_backend servers

backend servers
    balance roundrobin
    server web1 192.168.1.10:8080 check
    server web2 192.168.1.11:8080 check

Advantages

Proven reliability in production environments
Excellent performance and low latency
Comprehensive health checking
Flexible configuration options
Wide platform support

Official Resources

Website: haproxy.org
Documentation: haproxy.org/#docs
GitHub: github.com/haproxy/haproxy