Nagios Plugin check_clock

check_clock - returns the number of seconds elapsed between local time and Nagios time

[/etc/nrpe.d/check_clock]
command[check_clock]=/usr/lib/nagios/plugins/check_clock --refclock $ARG1$ -w 60 -c 120

where $ARG1$ is the number of seconds since the "Epoch"

(1970-01-01 00:00:00 UTC) -- $(date '+%s')

provided by the Nagios poller.

Usage note

This check is intended for alerting when the number of seconds elapsed between the Nagios poller and the monitored server exceeds a given threshold (60 seconds for the warning state, and 120 seconds for a critical notification, in the example above). The clock of the Nagios server needs, of course, to be synchronized to an NTP server.

This plugin returns the number of seconds elapsed between
the host local time and Nagios time.
Copyright (C) 2014 Davide Madrisan <davide.madrisan@gmail.com>

Usage:
  check_clock [-w COUNTER] [-c COUNTER] --refclock TIME

Options:
  -r, --refclock COUNTER  the clock reference (in seconds since the Epoch)
  -w, --warning COUNTER   warning threshold
  -c, --critical COUNTER  critical threshold
  -v, --verbose   show details for command-line debugging
                  (Nagios may truncate output)
  -h, --help      display this help and exit
  -V, --version   output version information and exit

Examples:
  check_clock -w 60 -c 120 --refclock $ARG1$

  # where $ARG1$ is the number of seconds since the Epoch: "$(date '+%s')"
  # provided by the Nagios poller

Example of output

clock OK - time delta 39s | clock_delta=39

Performance data

clock_delta