Monitor_start Method Code Listing

This method starts the PROBE program for the data service.

Example A-6 dns_monitor_start Method

#!/bin/ksh
#
# Monitor start Method for HA-DNS.
#
# This method starts the monitor (probe) for the data service under the 
# control of PMF. The monitor is a process that probes the data service
# at periodic intervals and if there is a problem restarts it on the same node
# or fails it over to another node in the cluster. The PMF tag for the
# monitor is $RESOURCE_NAME.monitor.

#pragma ident   “@(#)dns_monitor_start   1.1   00/05/24 SMI”

###############################################################################
# Parse program arguments.
#
function parse_args # [args ...]
{
        typeset opt

        while getopts `R:G:T:' opt
        do
                case “$opt” in
                R)
                        # Name of the DNS resource.
                        RESOURCE_NAME=$OPTARG
                        ;;
                G)
                        # Name of the resource group in which the resource is
                        # configured.
                        RESOURCEGROUP_NAME=$OPTARG
                        ;;
                T)
                        # Name of the resource type.
                        RESOURCETYPE_NAME=$OPTARG
                        ;;
                *)
          logger -p ${SYSLOG_FACILITY}.err \
                   -t [$RESOURCETYPE_NAME,$RESOURCEGROUP_NAME,$RESOURCE_NAME] \
                    “ERROR: Option $OPTARG unknown”
                     exit 1
                     ;;
                esac
        done

}

###############################################################################
# MAIN
#
###############################################################################

export PATH=/bin:/usr/bin:/usr/cluster/bin:/usr/sbin:/usr/proc/bin:$PATH

# Obtain the syslog facility to use to log messages.
SYSLOG_FACILITY=`scha_cluster_get -O SYSLOG_FACILITY`

# Parse the arguments that have been passed to this method
parse_args “$@”

PMF_TAG=$RESOURCE_NAME.monitor
SYSLOG_TAG=$RESOURCETYPE_NAME,$RESOURCEGROUP_NAME,$RESOURCE_NAME

# Find where the probe method resides by obtaining the value of the 
# RT_basedir property of the data service.
RT_BASEDIR=`scha_resource_get -O RT_basedir -R $RESOURCE_NAME \
-G $RESOURCEGROUP_NAMÈ

# Start the probe for the data service under PMF. Use the infinite retries 
# option to start the probe. Pass the resource name, group, and type to the 
# probe method. 
pmfadm -c $PMF_TAG.monitor -n -1 -t -1 \
    $RT_BASEDIR/dns_probe -R $RESOURCE_NAME -G $RESOURCEGROUP_NAME \
    -T $RESOURCETYPE_NAME

# Log a message indicating that the monitor for HA-DNS has been started.
if [ $? -eq 0 ]; then
   logger -p ${SYSLOG_FACILITY}.info -t [$SYSLOG_TAG] \
           “${ARGV0} Monitor for HA-DNS successfully started”
fi
exit 0