• limit_req2 module

• This is the enhanced version of nginx's limit_req module with white list support, and more limit conditions are allowed in a single location.
• This module will conflict with limit_req module when they be used together.
• This is fork for limit_req module from Tengine(http://tengine.taobao.org/)

Syntax: limit_req2_zone $session_variable1 $session_variable2 ... zone=name_of_zone:size rate=rate

Default: none

Context: http

Support more than one limit variables. For example:

limit_req2_zone $binary_remote_addr $uri zone=one:3m rate=1r/s;
limit_req2_zone $binary_remote_addr $request_uri zone=two:3m rate=1r/s;

The last line of the above example indicates a client can access a specific URI only once in a second.

Syntax: limit_req2 [on | off] | zone=zone_name burst=burst [forbid_action=action] [nodelay]

Default: none

Context: http, server, location

Multiple limit conditions are allowed in a single block. And all the conditions are examined in order. You can turn this directive on or off (default is on). 'forbid_action' specifies the action URL to redirect. It can be a named location. By default, tengine will return 503.

For example:

limit_req2_zone $binary_remote_addr zone=one:3m rate=1r/s;
limit_req2_zone $binary_remote_addr $uri zone=two:3m rate=1r/s;
limit_req2_zone $binary_remote_addr $request_uri zone=three:3m rate=1r/s;

location / {
    limit_req2 zone=one burst=5;
    limit_req2 zone=two forbid_action=@test1;
    limit_req2 zone=three burst=3 forbid_action=@test2;
}

location /off {
    limit_req2 off;
}

location @test1 {
    rewrite ^ /test1.html;
}

location @test2 {
    rewrite ^  /test2.html;
}

Syntax: limit_req2_whitelist geo_var_name=var_name geo_var_value=var_value

Default: none

Context: http, server, location

Set the whitelist. This directive needs work with the geo module. The 'geo_var_name' is the variable name declared in the geo module, 'geo_var_value' is its value. For example:

geo $white_ip {
    ranges;
    default 0;
    127.0.0.1-127.0.0.255 1;
}

limit_req2_whitelist geo_var_name=white_ip geo_var_value=1;

It means requests from IP (127.0.0.1 to 127.0.0.255) will be considered safe and let pass.