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  Post #1 (permalink)   01-13-2019, 07:14 AM
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In some cases we need to limit the rate of requests per ip when our website is overloaded or under heavy ddos attack.

Let's follow our instructions to do that :
1) Do the following command on server shell :
nano /etc/nginx/nginx.conf
2) Go to http section and add this after this line "http {" :
limit_req_zone $binary_remote_addr zone=mylimit:10m rate=1r/s;
This will limit 1 request per second for every visitor depending on his ip address .

3) Now we need to modify the following files by commands :
nano /etc/nginx/common_http.conf
nano /etc/nginx/common_https.conf
In each file search for the needed "location" you want to rate limit it and add the following after "location" line :
limit_req zone=mylimit;
For example :
    location /login.php {
        limit_req zone=mylimit;
        proxy_pass http://my_upstream;
If you need to add a delay instead of getting an error page you need to use "burst" attribute :
limit_req zone=mylimit burst=10;
Now visitor will be delayed in case of exceeded 1 request per second for a total 10 max delayed requests if exceeded an error page will appear .

4) Reload nginx with new configuration :
service nginx reload
That's all .

Good luck

Last edited by : 01-13-2019 at 07:19 AM.

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