How to use nginx current limit

Nginx implements current limiting through the following steps: Enable current limiting module: load_module ngx_http_limit_conn_module.so; Configure current limiting rules: limit_conn_zone $binary_remote_addr zone=mylimit:10m; Set rate limit: limit_conn mylimit 20; Reject requests that exceed the limit (default 503 error); Optional: Custom error page: error_page 503 /error-page.html;

How to use Nginx current limit

introduction

Nginx is a popular web server that provides current limiting capabilities that limit the client's request rate to the server and prevent server overloading.

step:

1. Enable the current limiting module

In the Nginx configuration file, add the following instructions to enable the current limiting module:

 <code class="nginx">load_module ngx_http_limit_conn_module.so;</code>

2. Configure current limit rules

Add the following instructions to configure the current limit rules in the server or virtual host block:

 <code class="nginx">limit_conn_zone $binary_remote_addr zone=mylimit:10m;</code>

• The $binary_remote_addr variable represents the binary IP address of the client.
• zone=mylimit specifies the name of the current limit zone.
• 10m specifies the size of the current limiting area, in megabytes.

3. Set a rate limit for the current limit zone

Set a rate limit for the created current limit zone:

 <code class="nginx">limit_conn mylimit 20;</code>

• mylimit is the name of the current limiting area created previously.
• 20 Specifies the maximum number of connections allowed per second.

4. Reject requests that exceed the limit

By default, requests that exceed the rate limit will return an HTTP 503 (service not available) error.

5. Customize the error page

If necessary, you can customize the error page that appears when the limit exceeds:

 <code class="nginx">error_page 503 /error-page.html;</code>

Sample configuration:

Here is a complete example configuration:

 <code class="nginx">load_module ngx_http_limit_conn_module.so; server { location / { limit_conn_zone $binary_remote_addr zone=mylimit:10m; limit_conn mylimit 20; error_page 503 /error-page.html; } }</code>

Note:

• The size and rate limits of the current limit zone can be adjusted as needed.
• Nginx also provides other current limiting modules, such as ngx_http_limit_req_module , which allows for finer granular control of request rates.

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