Re: snmptrapd does not write to log after logrotate

Hi Stefan,

If you issue a SIGHUP (Hangup signal) to the snmptrapd process, it will
re-read its config and also start logging to the rotated (empty) file. You
should add this step to the logrotate job.

Watch out for a bug in some older versions (5.6.1.1 notably) where
snmptrapd will fail to re-read the config efter 4096 SIGHUPs are received...

BR,
Joel Hansell


On Mon, Mar 31, 2014 at 10:32 AM, Stefan Billeb <[email protected]>wrote:

> Hello,
>
> I am using snmptrapd along with snmptt on my server.
> I recently did the following configuration on my server:
>
> * Set the listening of snmptrapd to 0.0.0.0 udp/1602 in the init-script
> * Duplicating incoming snmp traps with "samplicate", sent to own server
> ip/1602 and other host/162
> * Logrotate, log-target etc. still the same like it is for nearly a year
> now
>
> Since this configuration was done it seems that snmptrapd does not write
> to /var/log/net-snmpd.log when logrotate did rotate the logfile.
> Even though the rights are correct, after a logrotate was issued the
> snmptrapd daemon does not log to the file.
> Restarting the service appears to solve it. The log file is again filled
> with entries.
>
> I am not sure if this is really a logrotate problem - but I can't figure
> out what the problem really is, as with restart of service no
> permissions or anything change on /var/log/net-snmpd.log
> But I have seen this for days now that the log-file is empty after a
> logrotate was done until I restart the snmptrapd.
>
> Init-Script start options:
>
> OPTIONS="-Lf /var/log/net-snmpd.log -p /var/run/snmptrapd.pid
> udp:0.0.0.0:1602"
>
> Note that samplicate works as it should and traps are in any way
> received and processed correctly with snmptrapd and snmptt. It is just a
> problem with log-file.
>
> Regards,
> Stefan
>
>
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