Monitor_check Method Code Listing

This method verifies the existence of the directory that is pointed to by the Confdir property. The RGM calls Monitor_check when the PROBE method fails over the data service to a new node. The RGM also does so to check nodes that are potential masters.

Example A-8 dns_monitor_check Method

#!/bin/ksh#
# Monitor check  Method for DNS.
#
# The RGM calls this method whenever the fault monitor fails the data service
# over to a new node. Monitor_check calls the Validate method to verify
# that the configuration directory and files are available on the new node.

#pragma ident   “@(#)dns_monitor_check 1.1   12/01/24”

###############################################################################
# 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=$RESOURCE_NAME.named
SYSLOG_TAG=$RESOURCETYPE_NAME,$RESOURCEGROUP_NAME,$RESOURCE_NAME

# Obtain the full path for the Validate method from
# the RT_basedir property of the resource type.
RT_BASEDIR=`scha_resource_get -O RT_basedir -R $RESOURCE_NAME \
-G $RESOURCEGROUP_NAMÈ

# Obtain the name of the Validate method for this resource.
VALIDATE_METHOD=`scha_resource_get -O VALIDATE -R $RESOURCE_NAME \
-G $RESOURCEGROUP_NAMÈ

# Obtain the value of the Confdir property in order to start the
# data service. Use the resource name and the resource group entered to
# obtain the Confdir value set at the time of adding the resource.
config_info=`scha_resource_get -O Extension -R $RESOURCE_NAME \
-G $RESOURCEGROUP_NAME Confdir`

# scha_resource_get returns the type as well as the value for extension
# properties. Use awk to get only the value of the extension property.
CONFIG_DIR=`echo $config_info | awk `{print $2}'`

# Call the validate method so that the dataservice can be failed over
# successfully to the new node.
$RT_BASEDIR/$VALIDATE_METHOD -R $RESOURCE_NAME -G $RESOURCEGROUP_NAME \
-T $RESOURCETYPE_NAME -x Confdir=$CONFIG_DIR

# Log a message indicating that monitor check was successful.
if [ $? -eq 0 ]; then
   logger -p ${SYSLOG_FACILITY}.info -t [$SYSLOG_TAG] \
      “${ARGV0} Monitor check for DNS successful.”
   exit 0
else
   logger -p ${SYSLOG_FACILITY}.err -t [$SYSLOG_TAG] \
      “${ARGV0} Monitor check for DNS not successful.”
   exit 1
fi