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limit_conn_zone and limit_conn behavior in 1.2.8

April 12, 2013 04:44PM
In my config, within http section, I have:

limit_conn_zone $binary_remote_addr zone=addr:10m;
limit_conn addr 3;

which I interpret as, setting a memory zone of size 10 megabytes for keeping states of connected IPs and restricting 3 concurrent connections per IP at a time. If the size of the zone is exhausted or the limit per IP is breached, Nginx will return 503 as response.

I have them before upgrading to 1.2.8. During testing today, I found several 503 responses due to these settings, for example:

'2013/04/12 15:38:48 [error] 5888#0: *352 limiting connections by zone "addr", client:, server: static.mysite.com, request: "GET /js/jquery.reject.min.js HTTP/1.1", host: "static.mysite.com", referrer: "https://www.mysite.com/blah/blah?var=blah"

The client IP is here because Nginx is behind a HAproxy.

The test I did was launching several requests which requests for delivery of some JavaScripts from Nginx. Some of these requests return 200 OK, but a number of them failed with 503s. The same test I did before with Nginx 1.2.7 did not result any 503 responses. Any idea what might have caused this? Is it because the HAProxy in front of Nginx? Thanks!
Subject Author Posted

limit_conn_zone and limit_conn behavior in 1.2.8

mrtn April 12, 2013 04:44PM

Re: limit_conn_zone and limit_conn behavior in 1.2.8

mrtn April 14, 2013 07:06PM

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