Developing Data Services

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.

#!/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   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 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 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