How to solve nginx current limit

The problem of Nginx current limiting can be solved by: using ngx_http_limit_req_module to limit the number of requests; using ngx_http_limit_conn_module to limit the number of connections; using third-party modules (ngx_http_limit_connections_module, ngx_http_limit_rate_module, ngx_http_access_module) to implement more current limiting strategies; using cloud services (Cloudflare, Google Cloud Rate Limiting, AWS WAF) to DD

Nginx current limiting solution

Question: How to solve the problem of Nginx current limit?

Solution:

1. Use ngx_http_limit_req_module module

 <code class="conf"># 限制每个客户端每秒的请求次数limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; # 应用限流规则server { # ... location / { limit_req zone=one; } }</code>

2. Use ngx_http_limit_conn_module module

 <code class="conf"># 限制每个客户端的同时连接数limit_conn_zone $binary_remote_addr zone=one:10m; # 应用限流规则server { # ... location / { limit_conn zone=one; } }</code>

3. Use third-party modules

• ngx_http_limit_connections_module: Limit the total number of connections per client
• ngx_http_limit_rate_module: Limit the request rate per client
• ngx_http_access_module: Reject requests based on client IP or other conditions

4. Use cloud services

• Cloudflare: Provides DDoS protection and current limiting services
• Google Cloud Rate Limiting: Provides authentication-based API for stream limiting
• AWS WAF: Provides Region and Rate-based Web Application Firewall

5. Code layer current limit

Implement your own current limiting mechanism in your application code, such as using a token bucket algorithm or sliding window.

Notice:

• Choosing the appropriate flow limiting method depends on the application's requirements and traffic mode.
• Carefully adjust the current limit parameters to avoid misrejection and performance problems.
• Monitor current limiting activities to ensure effectiveness and timely adjustments.

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