TruCluster system information

With these changes, if the TruCluster member on which the application is running fails, or if a particular required resource fails, CAA does the following:

• Disables the monitoring of the application
• Relocates, or fails over, the application to another member that either has the required resources available or on which the required resource can be started
• Starts monitoring the application on that other member

Sample Application

#!/usr/bin/wish
set hname [exec hostname -s]
set clarg [lindex $argv 0]

wm minsize . 350 30
wm title . "$argv0 on $hname $clarg"

button .hostname -font helvb24 -text $hname -command { exit }
pack .hostname -padx 10 -pady 10

CAA Profile

NAME=xhostname
TYPE=application
ACTION_SCRIPT=xhostname.scr
ACTIVE_PLACEMENT=0
AUTO_START=0
CHECK_INTERVAL=60
DESCRIPTION=xhostname
FAILOVER_DELAY=0
FAILURE_INTERVAL=0
FAILURE_THRESHOLD=0
HOSTING_MEMBERS=
OPTIONAL_RESOURCES=
PLACEMENT=balanced
REQUIRED_RESOURCES=
RESTART_ATTEMPTS=1
SCRIPT_TIMEOUT=60

CAA Action Script

The following is the CAA action script for the xhostname application. This script contains annotations to show you where you need to modify the existing code.

#!/usr/bin/ksh -p
# 
# *****************************************************************
# *															 *
# *	Copyright (c) Digital Equipment Corporation, 1991, 1998	*
# *															 *
# *   All Rights Reserved.  Unpublished rights  reserved  under   *
# *   the copyright laws of the United States.					*
# *															 *
# *   The software contained on this media  is  proprietary  to   *
# *   and  embodies  the  confidential  technology  of  Digital   *
# *   Equipment Corporation.  Possession, use,  duplication  or   *
# *   dissemination of the software and media is authorized only  *
# *   pursuant to a valid written license from Digital Equipment  *
# *   Corporation.												*
# *															 *
# *   RESTRICTED RIGHTS LEGEND   Use, duplication, or disclosure  *
# *   by the U.S. Government is subject to restrictions  as  set  *
# *   forth in Subparagraph (c)(1)(ii)  of  DFARS  252.227-7013,  *
# *   or  in  FAR 52.227-19, as applicable.					 *
# *															 *
# *****************************************************************
#
# HISTORY
# 
# @(#)$RCSfile$ $Revision$ (DEC) $Date$
# 
# This is the CAA action script for the xhostname application.
# This action script has been modified so that the monitoring
# of the application fails over along with the application.
#
# The start and stop routines of the script have been enhanced
# to enable the monitoring template in the start routine and disable
# the monitoring template in the stop routine, using the
# "opctemplate -e | -d" command.  If the enabling and
# disabling of the monitoring template was not successful
# a message is sent to the HPOM management server. In order
# that the message is sent, the opcmsgi agent should be 
# running on the managed nodes (Assign and Distribute the
# Default Digital UNIX (Tru64 UNIX) opcmsg(1|3) template onto all the 
# TruCluster nodes).
#

PATH=/sbin:/usr/sbin:/usr/bin 
export PATH 
XHOSTNAME=/usr/bin/xhostname
export DISPLAY=":0"

(You need to add this next block of code from here….
# PATH for the opctemplate and opcmsg command
OPCTEMPLATE=/usr/opt/OV/bin/OpC/opctemplate
OPCMSG=/usr/opt/OV/bin/OpC/opcmsg

# Monitoring template for the Xhostname application
# that has been assigned and distributed to all the
# TruCluster nodes.
TEMPLATE=Xhostname
….to  here)

case $1 in 
	'start') 
# Start the xhostname application
		if [ -x $XHOSTNAME ]; then 
			if $XHOSTNAME & 
			then
(You need to add this next block of code from here…..
# Check if the opctemplate command exists. Enable the template.
				if [ -x $OPCTEMPLATE ]; then
				 $OPCTEMPLATE -e $TEMPLATE
# Check if the enabling of the template was successful 
# else send a message to the HPOM management server.
				 if [ `$OPCTEMPLATE -l $TEMPLATE | 
					grep -c enabled` -ne 1 ]
				 then
# Check if the opcmsgi agent is running. This agent is needed to send
# the message to the HPOM management server.
						if [ `ps -eaf | grep -v grep | 
							grep -c opcmsgi` -ne 0 ]
						then
						 $OPCMSG appl=$TEMPLATE \
						 msg_grp=OS \
						 object=daemon \
						 msg_text="Template $TEMPLATE not enabled" \
						 sev=warning
						fi
				 fi
				fi
….to  here)

			fi
		fi
	
		exit 0
	;;
		
	'stop') 
(You need to add this next block of code from here…..
# Check if the opctemplate command exists and disable the template
		if [ -x $OPCTEMPLATE ]; then
		 $OPCTEMPLATE -d $TEMPLATE
# Check if the disabling of the template was successful else send a
# message to the HPOM management server.
		 if [ `$OPCTEMPLATE -l $TEMPLATE | grep -c disabled` -ne 1 ]
		 then
# Check if the opcmsgi agent is running. This agent is needed to send
# the message to the HPOM management server.
				if [ `ps -eaf | grep -v grep | grep -c opcmsgi` -ne 0 ]
				then
				 $OPCMSG appl=$TEMPLATE \
				 msg_grp=OS \
				 object=daemon \
				 msg_text="Unable to disable template $TEMPLATE" \
				 sev=warning
				fi
		 fi
		fi
….to  here)

# Check if the xhostname application is running and stop it.
		ps -eu 0 -o pid,command | grep -v grep |
		grep -E '/usr/bin/xhostname' | cut -f1 -d' ' | \
		xargs kill -KILL

		exit 0
	;;

	'check')

		PID=`ps -eu 0 -o command | grep -v grep | grep -E '/usr/bin/xhostname' `
		if [ -z "$PID" ] ; then
			exit 1
		fi

		exit 0
	;;

	*)
		$ECHO "usage: $0 {start|stop|check}"
		exit 1
	;; 
esac