Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Manual page 147

Chapter 10. Configuring the LVS Routers with Piranha Configuration Tool
Figure 10-9. The EDIT MONITORING SCRIPTS Subsection
Sending Program
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.
Tip
To ensure that each server in the real server pool is checked, use the special token
%h after the path to the script in the Sending Program field. This token is replaced
with each real server's IP address as the script is called by the
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daemon.
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