Stop Method Code Listing

The RGM runs the Stop method on a cluster node when the resource group that contains the HA-DNS resource is brought offline on that node. The RGM also does so when the resource is disabled. This method stops the in.named (DNS) daemon on that node.

Example A-3 dns_svc_stop Method

#!/bin/ksh
#
# Stop method for HA-DNS
#
# Stop the data service using PMF. If the service is not running the
# method exits with status 0 as returning any other value puts the resource 
# in STOP_FAILED state.


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

###############################################################################
# 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 Stop_timeout value from the RTR file.
STOP_TIMEOUT=`scha_resource_get -O STOP_TIMEOUT -R $RESOURCE_NAME -G \
$RESOURCEGROUP_NAMÈ

# Attempt to stop the data service in an orderly manner using a SIGTERM
# signal through PMF. Wait for up to 80% of the Stop_timeout value to
# see if SIGTERM is successful in stopping the data service. If not, send SIGKILL
# to stop the data service. Use up to 15% of the Stop_timeout value to see
# if SIGKILL is successful. If not, there is a failure and the method exits with
# non-zero status. The remaining 5% of the Stop_timeout is for other uses. 
((SMOOTH_TIMEOUT=$STOP_TIMEOUT * 80/100))

((HARD_TIMEOUT=$STOP_TIMEOUT * 15/100))

# See if in.named is running, and if so, kill it. 
if pmfadm -q $PMF_TAG.named; then
   # Send a SIGTERM signal to the data service and wait for 80% of the
   # total timeout value.
   pmfadm -s $PMF_TAG.named -w $SMOOTH_TIMEOUT TERM
   if [ $? -ne 0 ]; then
      logger -p ${SYSLOG_FACILITY}.info -t [SYSLOG_TAG] \
          “${ARGV0} Failed to stop HA-DNS with SIGTERM; Retry with \
           SIGKILL”
      
      # Since the data service did not stop with a SIGTERM signal, use
      # SIGKILL now and wait for another 15% of the total timeout value.
      pmfadm -s $PMF_TAG.named -w $HARD_TIMEOUT KILL
      if [ $? -ne 0 ]; then
          logger -p ${SYSLOG_FACILITY}.err -t [SYSLOG_TAG] \
          “${ARGV0} Failed to stop HA-DNS; Exiting UNSUCCESSFUL”
          
          exit 1
      fi   
fi
else 
   # The data service is not running as of now. Log a message and 
   # exit success.
   logger -p ${SYSLOG_FACILITY}.info -t [SYSLOG_TAG] \
           “HA-DNS is not started”

   # Even if HA-DNS is not running, exit success to avoid putting 
   # the data service in STOP_FAILED State.
   exit 0
fi

# Successfully stopped DNS. Log a message and exit success.
logger -p ${SYSLOG_FACILITY}.info -t [$SYSLOG_TAG] \
    “HA-DNS successfully stopped”
exit 0