CloFix Load Balancer: Intelligent Traffic Distribution

Published on CloFix Blog | 12 min read

CloFix Load Balancer provides intelligent traffic distribution across multiple backend servers, ensuring your applications remain fast, reliable, and secure.

99.99%

Availability SLA

<1ms

Latency Overhead

Load Balancing Algorithms

100K+

Concurrent Connections

🛡️ Backend Information Hiding

CloFix Load Balancer automatically hides your backend infrastructure information from clients, preventing attackers from discovering your internal architecture.

📋 Headers Automatically Removed

Server
X-Powered-By
X-AspNet-Version
X-AspNetMvc-Version
X-Runtime
X-Version
X-Generator
X-Backend
X-Backend-Server
X-Backend-Host
X-Backend-IP
X-Upstream
X-Upstream-Server
X-Origin
X-Origin-Server
X-Proxy-Host
X-Proxy-IP
Via
X-Cache
X-Cache-Hit
X-Cache-Miss
X-Proxy-Cache
X-Varnish
X-Debug
X-Debug-Token
X-Request-ID
X-Correlation-ID
X-Real-IP
X-Forwarded-For
X-Forwarded-Host
X-Forwarded-Proto

🔄 Response Body URL Rewriting

# Before
backend domain: clofix.com → frontend domain: demo.clofix.com
http://clofix.com/page → https://demo.clofix.com/page

# After (client sees)
https://demo.clofix.com/page

All backend URLs in HTML, JSON, and XML responses are automatically rewritten to show only your frontend domain.

Header Type	Original (Backend)	After CloFix LB
Server	nginx/1.18.0	CloFix-WAF
X-Powered-By	PHP/7.4	Removed
X-Backend-Server	10.0.0.25:8080	Removed
X-Upstream	api.clofix.com:8443	Removed
Location (redirect)	http://clofix.com/page	https://demo.clofix.com/page

📢 Real-time Notifications

Stay informed about your backend infrastructure with instant notifications. CloFix Load Balancer automatically sends alerts when backends go down or recover.

🔴 Backend Down Alert

🔴 Backend DOWN
URL: https://clofix.com:443
Domain: demo.clofix.com
Time: 2026-03-26 10:30:45
Status: Unhealthy after 3 consecutive failures

🟢 Backend Recovered Alert

🟢 Backend RECOVERED
URL: https://clofix.com:443
Domain: demo.clofix.com
Time: 2026-03-26 10:32:15
Status: Health check passed, back in rotation

Configuration Example

Enable Notifications in your config:

alerts {
    enabled on;
    webhook_url "YOUR_WEBHOOK_URL";
}

💡 Tip: You can configure multiple alert channels including Slack, Email, Webhook, and Telegram.

Alert Type	Trigger Condition	Message Format	Action Required
🔴 DOWN	Backend fails `max_fails` consecutive checks	URL, Domain, Time, Failure reason	Investigate backend server
🟢 UP	Backend passes health check after being down	URL, Domain, Time, Recovery status	Verify service is stable
⚠️ WARNING	Backend latency exceeds threshold	URL, Response time, Threshold value	Monitor performance

Backend Configuration

# Single Backend
backend https://clofix.com:443;
backend http://localhost:8080;

# Multiple Backends with Load Balancing
backends https://clofix.com weight=10 backup=false max_fails=3 fail_timeout=30s, 
         https://api.clofix.com:8443 weight=5 backup=false max_fails=3 fail_timeout=30s, 
         http://backup.clofix.com:8080 weight=1 backup=true max_fails=2 fail_timeout=60s;

Backend Options Reference

Option	Description	Default	Example
`weight`	Load balancing weight (higher = more traffic)	1	`weight=10`
`backup`	Backup server (used only when primaries fail)	false	`backup=true`
`max_fails`	Max failures before marking unhealthy	3	`max_fails=5`
`fail_timeout`	Time to consider backend down after failures	30s	`fail_timeout=60s`
`max_conns`	Max concurrent connections	unlimited	`max_conns=100`

Load Balancing Algorithms

load_balancer {
    algorithm round_robin;   # round_robin | least_conn | ip_hash | random | weighted
    sticky_session on;
    sticky_session_cookie clofix_backend;
    max_retries 3;
    retry_timeout 5s;
}

Algorithm	Description	Best For	Sticky Session Support
round_robin	Distributes requests sequentially across servers	Equal capacity, stateless apps	✓ Yes
least_conn	Sends to server with fewest active connections	Long-lived connections, varying load	✓ Yes
ip_hash	Same client IP always goes to same backend	Session persistence without cookies	✓ Built-in
random	Random distribution across servers	Simple load balancing, testing	✓ Yes
weighted	Based on server weight configuration	Unequal server capacities	✓ Yes

Health Checks & Monitoring

load_balancer {
    health_check on;
    health_check_path /health;
    health_check_interval 10s;
    health_check_timeout 3s;
    health_check_expect 200;
}

Complete Configuration Example

domain demo.clofix.com {
    https on;
    redirect_http_to_https on;
    
    backends https://clofix.com:443 weight=10 max_fails=3 fail_timeout=30s, 
             https://api.clofix.com:8443 weight=5 max_fails=3 fail_timeout=30s,
             http://backup.clofix.com:8080 weight=1 backup=true;
    
    load_balancer {
        algorithm round_robin;
        sticky_session on;
        max_retries 3;
        retry_timeout 5s;
        health_check on;
        health_check_path /health;
        health_check_interval 10s;
        health_check_timeout 3s;
        health_check_expect 200;
    }
    
    ssl {
        ssl_certificate /etc/ssl/certs/demo.clofix.com.crt;
        ssl_certificate_key /etc/ssl/private/demo.clofix.com.key;
        ssl_protocols TLSv1.2 TLSv1.3;
    }
}

Key Features Summary

🎯

Load Balancing Algorithms

Round Robin
Least Connections
IP Hash
Weighted
Random

🩺

Health Monitoring

Active health probes
Passive failure detection
Automatic recovery
Real-time alerts

🔒

Security Hardening

Backend information hiding
Header sanitization
Client IP preservation
TLS/SSL termination

⚡

Performance

Connection pooling
HTTP/2 support
Zero-copy forwarding
Gzip compression

Conclusion

CloFix Load Balancer provides a robust, secure, and high-performance solution for distributing traffic across your backend infrastructure. With intelligent algorithms, comprehensive health checking, and advanced security features like backend information hiding, it ensures your applications remain available and performant under any load.

🚀 Deploy CloFix Load Balancer Today