snmptrapd on systemd

[Robert Mckennon]

Any systemd guru's out there?

Running on CentOS7.

I'm having a problem with snmptrapd.  When I start it from the commandline with:  snmptrapd -Lf /var/log/snmp-traps.log --disableAuthorization=yes

it works just fine!  I can send snmptraps from my routers to the server and they show up in the /var/log/snmp-traps.log file.

But when I kill the process, and start snmptrapd from systemd with: 
systemctl start snmptrapd

it starts without any errors, runs as the root user, and listens on port 162, but the traps are not showing up in the snmp-traps.log file.

I had to modify 2 snmptrap config files to get it to start from systemd and run without errors...
/etc/sysconfig/snmptrapd     
   OPTIONS="-Lf /var/log/snmp-traps.log"

/etc/snmp/snmptrapd.conf
  disableAuthorization yes


Here's an output from the status...

[root@splunk ~]# systemctl status snmptrapd
snmptrapd.service - Simple Network Management Protocol (SNMP) Trap Daemon.
   Loaded: loaded (/usr/lib/systemd/system/snmptrapd.service; enabled)
   Active: active (running) since Mon 2014-09-08 13:40:07 EDT; 4min 55s ago
 Main PID: 5379 (snmptrapd)
   CGroup: /system.slice/snmptrapd.service
           └─5379 /usr/sbin/snmptrapd -Lf /var/log/snmp-traps.log -f

Sep 08 13:40:07 splunk.peak10.services.monetra.com systemd[1]: Starting Simple Network Management Protocol (SNMP) Trap Daemon....
Sep 08 13:40:07 splunk.peak10.services.monetra.com systemd[1]: Started Simple Network Management Protocol (SNMP) Trap Daemon..


[root@splunk ~]# netstat -anp |grep udp
udp        0      0 0.0.0.0:162             0.0.0.0:*                           5379/snmptrapd     

[root@splunk log]# ps -elf |grep trap
4 S root      5379     1  0  80   0 - 56186 poll_s 13:40 ?        00:00:00 /usr/sbin/snmptrapd -Lf /var/log/snmp-traps.log -f

Any thoughts on solving this conundrum this would be greatly appreciated!

Rob.

[Robert Mckennon]

solved.... I don't know why this was happening, but I just deleted the log file, then restarted snmptrapd via:  systemctl restart snmptrapd, and viola, it worked.  Not sure why it wouldn't append to the current residing file, but it works fine now.

Rob.

p.s. thanx Brad!

[Gene Cronk]

Just a guess here, but starting it as root may have either set the file permissions for root (and starting the daemon the "normal" way couldn't write to the file), and/or done something funky with the SELinux attributes.

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