Nginx Limiting requests issue

I am limiting requests to max 15 requests per second on my forum, however when editing a topic it somehow returned 503 and logged that I did more than 15 requests a second.

I have no idea why, since I am only limiting requests on PHP Documents?

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Anyone have any idea why this happens? I counted, and there is only 5 documents (PHP) requests made, else are css etc.

Limiting requests, obviously helps against DDoS.. But so far, I've had nothing but issues with it due Ajax requests.

False-bans etc, such as in this case.. What I did was adding:

Code:

map $request_uri $search_ratelimit {
        default           $binary_remote_addr;
        "~/ajax/"       "";
        "~/files/"       "";
        "~/applications/core/interface/imageproxy/"       "";
}

limit_req_zone  $search_ratelimit  zone=one:10m   rate=15r/s;

to nginx.conf

Code:

& limit_req   zone=one  burst=1 nodelay;

to php.conf

Now, even if I make rate to 5 r/s, it's not giving more errors than one 503 on that page.. or if i make it 30, it will still be one of those that will give 503.. makes no sense. Unless I am miss understanding how it works.

 

As you can see, it's far from 15 or even 30 requests a second to PHP Documents.. It's only 4-5 php files, so that's impossible.

This is a example of what I am trying to do: Rate Limiting With nginx

PS. My burst is set to 1, could this be the reason? I don't really understand what burst is-

 

thanks for the reply

i lifted burst to 5, and changed r/s down to 10.. so far it seems to be working fine, no false alerts.. also if i hold down f5 it gets blocked, which is what i want..

the & wasnt there, i just forgot to remove it when putting into code tag.

 

1-2 burst would give me error even when its far from 15r/S , 5 burst seems to work..

 

2016/01/06 18:58:50 [error] 1712#1712: *9918833 limiting requests, excess: 2.000 by zone "one",

thats what i got, not sure what 2.000 means, however thats what happens when i had burst at 1 and requests / second to 15.