Running Custom Scripts When Alerts Are Triggered - Tripp Lite B092-016 Owner's Manual

Chapter 15: Advanced Configuration

15.1.2 Running custom scripts when alerts are triggered

Whenever an alert gets triggered, specific scripts get called. These scripts all reside in /etc/scripts/. Below is a list of the default
scripts that get run for each applicable alert:
• For a connection alert (when a user connects or disconnects from a port or network host):
/etc/scripts/portmanager-user-alert (for port connections) or /etc/scripts/sdt-user-alert (for host connections)
• For a signal alert (when a signal on a port changes state): /etc/scripts/portmanager-signal-alert
• For a pattern match alert (when a specific regular expression is found in the serial ports character stream):
/etc/scripts/portmanager-pattern-alert
• For a UPS status alert (when the UPS power status changes between on line, on battery, and low battery):
/etc/scripts/ups-status-alert
• For a environmental, power and alarm sensor alerts(temperature, humidity, power load and battery charge alerts):
/etc/scripts/environmental-alert
• For an interface failover alert: /etc/scripts/interface-failover-alert
All of these scripts do a check to see whether you have created a custom script to run instead. The code that does this check
is shown below (an extract from the file /etc/scripts/portmanager-pattern-alert):
# If there's a user-configured script, run it instead
scripts[0]="/etc/config/scripts/pattern-alert.${ALERT_PORTNAME}"
scripts[1]="/etc/config/scripts/portmanager-pattern-alert"
for (( i=0 ; i < ${#scripts[@]} ; i++ )); do
if [ -f "${scripts[$i]}" ]; then
exec /bin/sh "${scripts[$i]}"
fi
done
This code shows that there are two alternative scripts that can be run instead of the default one. This code first checks
whether a file "/etc/config/scripts/pattern-alert.${ALERT_PORTNAME}" exists. The variable ${ALERT_PORTNAME} must be
replaced with "port01" or "port13" or whichever port the alert should run for. If this file cannot be found, the script checks
whether the file "/etc/config/scripts/portmanager-pattern-alert" exists. If either of these files exists the script calls the exec
command on the first file that it finds and runs that custom file/script instead.
As an example, you can copy the /etc/scripts/portmanager-pattern-alert script file to
/etc/config/scripts/portmanager-pattern-alert:
# cd /
# mkdir /etc/config/scripts (if the directory does not already exist)
# cp /etc/scripts/portmanager-pattern-alert /etc/config/scripts/portmanager-pattern-alert
The next step will be to edit the new script file. Firstly, open the file /etc/config/scripts/portmanager-pattern-alert using vi (or
any other editor), and remove the lines that check for a custom script (the code from above) - this will prevent the new custom
script from repeatedly calling itself. After these lines have been removed, edit the file, or add any additional scripting to the
file.
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