For more advanced service verification, you can use this field to specify the path to a service-checking script. This functionality is especially helpful for services that require dynamically changing data, such as HTTPS or SSL.

To use this functionality, you must write a script that returns a textual response, set it to be executable, and type the path to it in the Sending Program field.

The following is a sample script to use as a guide when composing an external service-checking script:

#!/bin/sh

TEST=`dig -t soa example.com @$1 | grep -c dns.example.com

if [ $TEST != "1" ]; then
echo "OK
else
echo "FAIL"
fi

Enter a string for the nanny daemon to send to each real server in this field. By default the send field is completed for HTTP. You can alter this value depending on your needs. If you leave this field blank, the nanny daemon attempts to open the port and assume the service is running if it succeeds.

Only one send sequence is allowed in this field, and it can only contain printable, ASCII characters as well as the following escape characters:

Enter a the textual response the server should return if it is functioning properly. If you wrote your own sending program, enter the response you told it to send if it was successful.