NGINX load balancer DOS itself

Posted by cjaredrun on Server Fault See other posts from Server Fault or by cjaredrun
Published on 2012-06-17T19:08:38Z Indexed on 2012/06/17 21:18 UTC
Read the original article Hit count: 289

Filed under:

nginx

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load-balancing

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tcp

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load

I have been running a load balancing machine for a number of months now which has had no problems in the past. I got woken up to some downtime and I am seeing this a lot in syslog:

TCP: Possible SYN flooding on port 80. Sending cookies.

At which point Nginx takes up 100% of the cpu and doesn't come back down to normal for several minutes.

I have it running on Ubuntu currently but I also was able to replicate on Debian 6.

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