17 messages in ru.sysoev.nginxRe: Is it possible to monitor the fai...
FromSent OnAttachments
Robbie AllenJun 27, 2008 5:22 pm 
Alexander StauboJun 27, 2008 5:39 pm 
Robbie AllenJun 27, 2008 6:08 pm 
Rt IbmerJun 27, 2008 6:54 pm 
mikeJun 27, 2008 11:02 pm 
Grzegorz NosekJun 28, 2008 4:50 am 
Grzegorz NosekJun 28, 2008 5:31 am 
mikeJun 28, 2008 9:14 am 
Alexander StauboJun 28, 2008 12:28 pm 
Grzegorz NosekJun 28, 2008 12:53 pm 
Almir KaricJun 28, 2008 1:30 pm 
Brice FigureauJun 28, 2008 2:36 pm 
Alexander StauboJun 28, 2008 4:02 pm 
Rt IbmerJun 28, 2008 9:38 pm 
Grzegorz NosekJun 29, 2008 10:57 am.patch, .patch, .patch
Brice FigureauJun 30, 2008 12:23 pm 
Grzegorz NosekJun 30, 2008 12:49 pm 
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Subject:Re: Is it possible to monitor the fair proxy balancer?Actions...
From:Alexander Staubo (alex@public.gmane.org)
Date:Jun 27, 2008 5:39:23 pm
List:ru.sysoev.nginx

On Sat, Jun 28, 2008 at 2:23 AM, Robbie Allen
<list@public.gmane.org> wrote:

Periodically one or more of my mongrel instances will stop getting requests from nginx (via upstream fair). The mongrel process is still running, but not getting any requests.

Our experience is that the "fair" load balancer is unstable under heavy load, and tends to gradually pull upstreams out of the pool. This may be what you are experiencing.

How can I verify if nginx has taken it out of service? Is it possible to get details on the current status of the fair proxy?

Not at the moment. If you want this kind of information, I recommend HAProxy. In addition to providing machine-readable per-backend stats, it also renders the same information as an HTML page:

http://www.igvita.com/posts/05-08/haproxy-large.png

I also see the following error in syslog, but I'm unsure if it is related....

nginx[17280]: segfault at 00007fffa0869fd0 rip 00002ac509ea61e3 rsp 00007fffa0869ed0 error 6

That's a segment fault -- ie., Nginx is crashing on you.

Alexander.