[RADIATOR] SNMPAgent and high peak in cacti graph at logrotate

[Barry Ard]

Dennis Ortsen wrote:
> Hello all,
>
> we have 2 radiator 4.3.1-1 (RPM) instances running on 2 RHEL5.2 
> server. On both we have enabled the SNMPAgent to monitor Challenges, 
> Requests, Accepts in Authentication and we monitor Authentication 
> errors in cacti (rrdtool). The SNMPAgent works fine, monitoring in 
> cacti also works fine, but every night at 04:00 all graphs in cacti 
> show a huge peak. This is exactly the same time that the servers 
> rotate their logfiles. When radiator gets its logfile rotated, a 
> SIGHUP signal is sent to the radiuspid to force radiator to use the 
> new logfile. My guess is that this SIGHUP signal is causing the 
> SNMPAgent to "reset" itself too, which results in the huge peak in the 
> cacti graphs. This behaviour renders the cacti graphs unusable, while 
> it is actually a nice collection of statistics we can use to better 
> understand authentication errors in our wireless network.
>
> Is there a way to get rid of that peak, in other words, make sure that 
> the SNMPAgent doesn't get "reset" or skips the result of the peak?
>
> SNMPAgent config section:
> ==========================================
> <SNMPAgent>
>         ROCommunity some_string
> </SNMPAgent>
> ==========================================
>
> current logrotate script for radiator:
> ==========================================
> /var/log/radius/logfile {
>     rotate 2
>     size 50M
>     daily
>     postrotate
>         /bin/kill -HUP `cat /var/log/radius/radiusd.pid 2> /dev/null` 
> 2> /dev/null || true
>     endscript
> }
> ==========================================
>
> Thanks in advance,
>
> with kind regards,
>
> Dennis Ortsen
> HAN University
>
>
>
>
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>
Why bother using logrotate but use the radiator defined "Special 
Characters" to specify the logfile, like:
LogFile /var/log/radiator/%Y%m%d.log

Barry