Extension Properties in the RTR File

At the end of the sample RTR file are extension properties, as shown in this listing.

# Extension Properties

# The cluster administrator must set the value of this property to point to the
# directory that contains the configuration files used by the application.
# For this application, DNS, specify the path of the DNS configuration file on
# PXFS (typically named.conf).
{
   PROPERTY = Confdir;
   EXTENSION;
   STRING;
   TUNABLE = AT_CREATION;
   DESCRIPTION = “The Configuration Directory Path”;
}

# Time out value in seconds before declaring the probe as failed.
{
   PROPERTY = Probe_timeout;
   EXTENSION;
   INT;
   DEFAULT = 120;
   TUNABLE = ANYTIME;
   DESCRIPTION = “Time out value for the probe (seconds)”;
}

The sample RTR file defines two extension properties, Confdir and Probe_timeout. The Confdir property specifies the path to the DNS configuration directory. This directory contains the in.named file, which DNS requires to operate successfully. The sample data service's Start and Validate methods use this property to verify that the configuration directory and the in.named file are accessible before starting DNS.

When the data service is configured, the Validate method verifies that the new directory is accessible.

The sample data service's PROBE method is not a Sun Cluster callback method but a user-defined method. Therefore, Sun Cluster does not provide a Probe_timeout property for it. You need to define an extension property in the RTR file to enable a cluster administrator to configure a Probe_timeout value.