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From Ben Laurie <>
Subject Re: things to look for in runaway server?
Date Thu, 14 Sep 1995 08:49:25 GMT
> is running 0.8.11, is a BSDI 2.0.1 box, and gets about 350K 
> hits/day with peaks of 350/minute.  It's for the most part stable, 
> with 30-50 children in the pool at peak, but every now and then the 
> server goes wild and creates as many children as possible, wedging the 
> machine, slowing down requests (though they still get out).  Since I'm 
> not always on the machine I'm not there to see when it gets wedged what's 
> going on, so we're trying to develop a script that runs every two minutes 
> and takes a snapshot of the system.  Given that this should include a 
> load average, a number of concurrent httpd's, and the output of a vmstat 
> and iostat, is there anything else it should look for?
> The logfiles indicate that reverse DNS stopped working (so the log files 
> just had IP numbers in it) and every 50 hits had a listing like
> - - [13/Sep/1995:13:26:23 -0700] "NULL" 200 920

I'll wager that setting your MaxClients lower will solve this (at the cost
of locking people out occasionally).

Ben Laurie                  Phone: +44 (181) 994 6435
Freelance Consultant        Fax:   +44 (181) 994 6472
and Technical Director      Email: (preferred)
A.L. Digital Ltd,         (backup)
London, England.

[Note for the paranoid: "fear" as in "Fear and Loathing
in Las Vegas", "demon" as in Demon Internet Services, a
commercial Internet access provider.]

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