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15.1.3 Example script - Power Cycling on Pattern Match
For example, we have an RPC (PDU) connected to port 1 on a console server and also have some
telecommunications device connected to port 2 (which is powered by the RPC outlet 3). Now assume
the telecom device transmits a character stream "EMERGENCY" out on its serial console port every time
that it encounters some specific error, and the only way to fix this error is to power cycle the telecom
device.
The first step is to setup a pattern-match alert on port 2 to check for the pattern "EMERGENCY".
Next we need to create a custom script to deal with this 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
Note: Make sure to remove the if statement (which checks for a custom script) from the new script, in
order to prevent an infinite loop.
The pmpower utility is used to send power commands to RPC device in order to power cycle our telecom
device:
# pmpower -l port01 -o 3 cycle (The RPC is on serial port 1. The telecom device is powered by
RPC outlet 3)
We can now append this command to our custom script. This will guarantee that our telecom device will
be power cycled every time the console reads the "EMERGENCY" character stream on port 2.
15.1.4 Example script - Multiple email notifications on each alert
If you want to send more than one email when an alert triggers, you have to create a replacement script
using the method described above and add the appropriate lines to your new script.
Currently, there is a script /etc/scripts/alert-email that runs from within all the alert scripts (for example,
portmanager-user-alert or environmental-alert). The alert-email script sends the email. The line that
invokes the email script is as follows:
/bin/sh /etc/scripts/alert-email $suffix &
If you want to send another email to a single address or the same email to many recipients, edit the
custom script appropriately. You can follow the examples in any of the seven alert scripts listed above.
In particular, consider the portmanager-user-alert script. If you need to send the same alert email to
more than one email address, find the lines in the script responsible for invoking the alert-email script,
then add the following lines below the existing lines:
export TOADDR="emailaddress@domain.com"
/bin/sh /etc/scripts/alert-email $suffix &
These two lines assign a new email address to TOADDR and invoke the alert-email script in the
background.
15.1.5 Deleting Configuration Values from the CLI
The delete-node script is provided to help with deleting nodes from the command line. The "delete-
node" script takes one argument, the node name you want to delete (for example, "config.users.user1"
or "config.sdt.hosts.host1").
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