<div dir="ltr">Hello,<div><br></div><div>I have a requirement to rate limit requests to one of my customer facing API's. At present Nginx is a proxy point directing traffic to network internal servers based on endpoint URL. I am interested in integrating more tightly with Nginx to do this rate limiting before the traffic is passed to my upstream resources. I'm in research phases and theres a lot of moving pieces to the project, so in the interest of clarity I've tried to organize the below into sensible lists. Please let me know if if I'm not providing enough detail. </div>
<div><br></div><div>Implementation specific limitations:</div><div><ul><li>Our user base traffic tends to originate from networks where NAT is heavily used. Unfortunately, rate limiting by IP address would generate massive amounts of false positives as a result. </li>
<li>Our API is not 'open' and requires a successful authentication handshake (Oauth) to continue. Further requests utilize an auth token in headers to maintain session state. Auth tokens are alpha numeric strings with a length of 64 characters. </li>
<li>High Traffic! (30k+ req/sec)</li></ul><div><br></div></div><div>Questions:</div><div><ul><li>Is it feasible to do rate limiting based on an auth token?</li><li>Is it feasible to insert strings of this length as keys into the zone?</li>
<li>Is the zone an in memory 'object' (for lack of a better word)?</li><li>Is there a performance drawback for create one large in memory zone that is GB as opposed to MB? </li><li>How long do keys live in the zone? If I set a 1+ GB zone file, what happens if our aggregate request volume bursts and the zone runs out of storage space? There is a sentence in the documentation I find frightening, "<span style="text-align:justify">If the zone storage is exhausted, the server will return the 503 (Service Temporarily Unavailable) error to all further requests."<font color="#000000" face="Georgia, serif" size="3"> (</font></span><a href="http://nginx.org/en/docs/http/ngx_http_limit_req_module.html">http://nginx.org/en/docs/http/ngx_http_limit_req_module.html</a>)</li>
<li>Are there better alternatives?</li></ul><div>Thank You</div></div></div>