Nginx Rate Limit Calculation

Scenario

Your Nginx web server has recently experienced performance issues caused by excessive traffic from a few aggressive clients. You've decided to enable rate limiting based on the recent traffic pattern. To determine the proper limit, you first need to analyze request frequency.

Task

Find the top 3 client IPs by number of requests from /var/log/nginx/access.log, calculate the rate limit using the formula (sum of top 3 IP request counts / 3) * 0.8, write this value into /etc/nginx/nginx.conf as limit_req_zone $binary_remote_addr zone=app_limit:10m rate=<rate_limit>r/s;, and verify the configuration with nginx -t.

Example

# Before (no rate limiting configured)

Access log contains thousands of requests from various IPs
No rate limit configured in nginx.conf
Need to analyze traffic and set appropriate limit

# After (rate limit calculated and configured)

Top 3 IPs analyzed: 4523, 3891, 3456 requests
Rate limit calculated: 7896 r/s
Configuration updated and validated successfully
nginx -t: syntax ok, test successful

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