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nginx_module_ratelimiter

a nignx http module that limits request number

precondition

download the nginx source code

configure

# git clone this repo
# go to the nginx source code folder
# specify this repo path of your system
./configure --add-module=/home/sky/code/nginx_module_ratelimiter

build

make && make install

nginx.conf

# add below ratelimiter option into http section:ratelimiter [expired time(ms)] [slab size(m/k/g)]
http {
    ....
    ratelimiter 500 10m; 
    ....
}
# expired time means all requests have a expired time,when there is a unexpired request,a same request is coming, this new request will be dropped and return 403.
# slab size represets the total memory that store the all unexpired requests, 
# if this memory is run out, the nginx will drop the following requests and return 403.
# if the requests in slab memory expire, the memory will be released and treats the new requests again.

test

./nginx

open http://localhost , you will see the 403 Forbidden in the browser when you refresh the same page many times during 500ms

reference

深入理解Nginx（第2版）