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SNMPd on my CentOS systems is sending log messages to syslog every time it receives a query from my monitoring tools. Is there a way to lower the verbosity of SNMPd? It adds a lot of clutter to the logs.

Sep 12 13:05:40 myhost snmpd[7073]: Received SNMP packet(s) from UDP: [ipaddr]:42874
Sep 12 13:05:40 myhost snmpd[7073]: Connection from UDP: [ipaddr]:49272

Thanks!

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3 Answers

up vote 9 down vote accepted

Check the command that starts snmpd (possibly somewhere /etc/rc.d/ - in Ubuntu it's /etc/defaults/snmpd) for the logging options:

SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid -g root 0.0.0.0'

Or find it in the ps aux | grep snmpd output.

The man page gives the logging options:

-Ls FACILITY

Log messages via syslog, using the specified facility ('d' for LOG_DAEMON, 'u' for LOG_USER, or '0'-'7' for LOG_LOCAL0 through LOG_LOCAL7). There are also "upper case" versions of each of these options, which allow the corresponding logging mechanism to be restricted to certain priorities of message.

For -LF and -LS the priority specification comes before the file or facility token. The priorities recognised are:

0 or ! for LOG_EMERG,
1 or a for LOG_ALERT,
2 or c for LOG_CRIT,
3 or e for LOG_ERR,
4 or w for LOG_WARNING,
5 or n for LOG_NOTICE,
6 or i for LOG_INFO, and
7 or d for LOG_DEBUG. 

The default is fairly verbose (only 2 levels below debug):

Normal output is (or will be!) logged at a priority level of LOG_NOTICE

If you're logging to syslog via LOG_DAEMON (-Lsd), you could reduce it to e.g. LOG_WARNING with -LSwd/-LS4d, or LOG_ERR with -LSed/-LS3d.

(Edited to put the options in the right order.)

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In order to set the minimum priority to LOG_WARNING, (which is what I usually use) simply change the argopt:

-Lsd

to

-LSwd

Which stands for:

  • S: syslog, priority comes next
  • w: (or 4) log only warnings and more relevant messages
  • d: use the LOG_DAEMON facility

As stated in the man (but actually missing a clear example):

For -LF and -LS the priority specification comes before the file or facility token

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Oops, I missed the order of priority/facility. –  Andrew Sep 14 '11 at 2:45
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I completely remove the "-Lsd" directive from the /etc/sysconfig/snmpd.options file in CentOS/Redhat installations, leaving a file that reads:

# snmpd command line options
OPTIONS="-Lf /dev/null -p /var/run/snmpd.pid -a"
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does this completely stop all snmpd logs, or does it fall back to default logging? –  Banjer Nov 16 '12 at 11:59
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