How to configure mod_ratelimit module in Apache?

The `mod_ratelimit` module is used to limit the bandwidth that Apache utilizes during data transfers. Here’s how to configure this module in Apache:

1. Enable the module: The first thing you need to do is enable the mod\_ratelimit module. This can be done with the command `a2enmod ratelimit` in Debian-based distributions. In Red Hat-based distributions, make sure you have the module file located in the modules directory (/etc/httpd/modules), then you just need to include or uncomment the line `LoadModule rate_limit modules/mod_ratelimit.so` in your Apache config file.

1. Configure the module: The main directive used for mod\_ratelimit is `RLimitBandwidth`. This directive limits the rate of response transmission to the client.

To use it, you have to specify it in your configuration file either in `` (if you want to limit the bandwidth in a specific directory), `` or `` context (if you apply to a specific website). For example:

```
RLimitBandwidth 500

```
Or

```
ServerName www.mywebsite.com DocumentRoot /var/www/mywebsite RLimitBandwidth 500KB/s

```
In the above example, the bandwidth is limited to 500KB/s.

1. Apply changes: After applying the above changes, restart of your apache server is needed for changes to reflect. You can accomplish this with the command `service apache2 restart` on Ubuntu/Debian, or `systemctl restart httpd` on CentOS/Redhat.

Note: The Rates are specified in bytes per second. The default value is unlimited. You can use K or M as shorthand for kilobytes and megabytes, respectively.