STOP Method Code Listing

#!/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 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=$RESOURCE_NAME.named
SYSLOG_TAG=$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_NAME`

# 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 UNSUCCESFUL"
		    
		    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