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nagios-plugin-check_rsyslogd

Nagios NRPE and "regular" check for rsyslogd throughput and queue size

Dependencies

CPAN module Debian/Ubuntu package
JSON libjson-perl
Monitoring::Plugin/Nagios::Plugin libmonitoring-plugin-perl/libnagios-plugin-perl
Array::Utils libarray-utils-perl
Date::Parse libtimedate-perl

Checks supported

For more details, see --help.

  • Check input modules for throughput to see if rsyslogd is receiving any logs
  • Check queues for size/depth to see how big or if you have a backlog.
  • Take ucarp status into account, i.e. don't error out if we're BACKUP because we won't receive any syslog then

rsyslogd configuration

# NOTE If you are using Ubuntu (and possibly Debian) rsyslog of version
# 8.16.0-1ubuntu3 there is a bug where the `json` and `cee` formats are inverted.
# Ergo: If you pick `cee` you get `json` and vice versa.
module(load="impstats" interval="60" format="json")

module(load="omprog")
if $fromhost-ip == "127.0.0.1" and $programname == "rsyslogd-pstats" then {
  action(
    name="action-omprog-impstats"
    type="omprog"
    binary="/usr/lib/nagios/plugins/check_rsyslogd.pl --write"
  )
}

ucarp support and configuration

ucarp is a userland implementation of the CARP protocol. Currently, it has no way to check the status of ucarp except sending a USR1 signal to it which syslogs if it's MASTER or BACKUP. The --carp check creates a one line "status" file with the last [INFO] message from ucarp.

else if $fromhost-ip == "127.0.0.1" and $programname == "ucarp" and $msg startswith " [INFO]" then {
  action(
    name="action-omprog-ucarp-status"
    type="omprog"
    binary="/usr/lib/nagios/plugins/check_rsyslogd.pl --ucarp"
  )
}

Naming input modules

If you are listening on both IPv6 and IPv4 the name in the statistic has the same name/key. To avoid this, bind to IPv{6,4} seperately using two inputs and name them manually.

There is also inconsistent naming of the input modules in the statistics. imudp has a setting to append the port to the name but the others don't have that setting but append it anyway.