[web interface problems] status.dat on tmpfs problem

[Andreas Ericsson]

Marcel Mitsuto Fucatu Sugano wrote:
> Hi List, Andreas, 
> 
> On Fri, 2005-09-30 at 13:43 +0200, Andreas Ericsson wrote:
> 
>>Lori Adams wrote:
>>
>>>I can't seem to get to your site.  http://oss.op5.se/nagios.  I am
>>>trying to find the latest package or sources for nrpe on solaris.  Would
>>>your site have the most recent ones?
>>
>>
>>Yes. My ISP is however thoroughly stubborn about their stupidity. I have 
>>dual static IP's at home, and they only seem to be capable of serving 
>>one at the time. I didn't even know about it until people started 
>>complaining about not being able to reach oss.op5.se (obviously, it 
>>works from the inside).
>>
> 
> 
> I've tried to place status.dat file on a tmpfs, and the status.cgi
> begins to crash with "premature ending of cgi script" messages on
> errorlog. And 500 Internal Server error display. 
> 
> What i should do to fix this situation? 
> 

I'm not sure, since I don't know what the actual errors are.

However, writing the status.dat file to ramdisk won't improve 
performance much since the kernel will cache the file in memory anyways. 
If it hasn't got memory to spare for the tmpfs you'll end up using the 
swap partition which is actually more expensive to fetch from than a 
continuous block of data on a real partition.

> I've mounted a tmpfs at /opt/nagios/var/tmpfs and pointed nagios to
> write the status file at that path. My status.dat file is about 15MB. At
> the nagios-devel list, I saw a lot of messages claiming for CGI scaling
> improvements, the same problem I need to manage with the nagios config
> i'm working. It's distributed monitoring with almost 10k of services
> been actively monitored and all the status piped to send_nsca to a
> central nagios server. This config gives me something about 300 alarms,
> and the status.cgi takes real long to load. 
> 
> TIA,
> Marcel Mitsuto
> 
> 
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-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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