Generating Error Messages

It is recommended that callback methods use the syslog facility to output error messages to end users. All callback methods in the sample data service use the scha_cluster_get() function to retrieve the number of the syslog facility 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 facility 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.