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Olly
Asked: 2011-01-13 06:18:10 +0800 CST

HAProxy being killed with more that 54,000 connections

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I am trying to run HAProxy (1.4.8) on a EC2 machine running Ubuntu 10.04. I need HAProxy to be able to handle many thousands of long-running persistent connections (websockets). With the current setup HAProxy gets killed at around 54,300 connections (roughly).

If I am running HAProxy in the foreground, the only output is "Killed". Am I right in thinking this is the Kernel killing the process? Is this because it is out of resources? Can I increase the resources?

The CPU and memory consumption are low with 50,000 connections, so I don't suspect either of these.

How can I prevent this from happening?

ubuntu haproxy

2 Answers

  1. Switching to a 64-bit instance solved the problem. I'm guessing we were running into the per-process memory limit on a 32-bit instance.

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  2. You should check this answer from Wily Tarreau to the very same question:

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