/usr/share/nagios3/plugins/eventhandlers/enable_active_service_checks is in nagios3-common 3.5.1.dfsg-2.1ubuntu1.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!/bin/sh
# Write a command to the Nagios command file to cause
# it to enable active service checks. This can be
# referred to as 'active' mode in a redundant monitoring
# environment.
# Notes:
# 1) This script is not intended to be used as an
# event handler by itself. Instead, it is used by other
# event handler scripts (like the redundancy examples).
# 2) In order for Nagios to process any commands that
# are written to the command file, you must enable
# the check_external_commands option in the main
# configuration file.
printfcmd="/usr/bin/printf"
CommandFile="/var/lib/nagios3/rw/nagios.cmd"
# get the current date/time in seconds since UNIX epoch
datetime=`date +%s`
# pipe the command to the command file
`$printfcmd "[%i] START_EXECUTING_SVC_CHECKS\n" $datetime >> $CommandFile`
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