Generating Error Messages

Callback methods should use the syslog() function to output error messages to end users. All callback methods in the sample data service use the scha_cluster_get command to retrieve the number of the syslog() function that is used for the cluster log, as follows:

SYSLOG_FACILITY=`scha_cluster_get -O SYSLOG_FACILITY`

The value is stored in a shell variable, SYSLOG_FACILITY, and can be used as the facility of the logger command to log messages in the cluster log. For example, the Start method in the sample data service retrieves the syslog() function and logs a message that the data service has been started, as follows:

SYSLOG_FACILITY=`scha_cluster_get -O SYSLOG_FACILITY`
...
if [ $? -eq 0 ]; then
   logger -p ${SYSLOG_FACILITY}.err \
         -t [$SYSLOG_TAG] \
         "${ARGV0} HA-DNS successfully started"
fi

See the scha_cluster_get(1HA) man page for more information.