initial commit
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Fabio Scotto di Santolo
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chapter22/pingnodes.ksh
Executable file
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chapter22/pingnodes.ksh
Executable file
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#!/usr/bin/ksh
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#
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#
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# SCRIPT: pingnodes.ksh
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# AUTHOR: Randy Michael
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# DATE: 02-20-2007
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#
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# PURPOSE: This script is used to ping a list of nodes and
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# send e-mail notification (or alpha-numeric page) of any unreachable
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# nodes.
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#
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# REV: 1.0.A
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#
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# REV.LIST:
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#
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#
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# set -x # Uncomment to debug this script
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# set -n # Uncomment to check command syntax without any execution
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#
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#######################################################
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# Set a trap and cleanup before a trapped exit...
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# REMEMBER: you CANNOT trap "kill -9"
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trap 'echo "\n\nExiting on trapped signal...\n" \
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;exit 1' 1 2 3 15
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#######################################################
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# Define and initialize variables here...
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PING_COUNT="3" # The number of times to ping each node
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PACKET_SIZE="56" # Packet size of each ping
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typeset -u PINGNODES # Always use the UPPERCASE value for $PINGNODES
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PINGNODES="TRUE" # To enable or disable pinging FROM this node - "TRUE"
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typeset -u MAILOUT # Always use the UPPERCASE value for $MAILOUT
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MAILOUT="TRUE" # TRUE enables outbound mail notification of events
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UNAME=$(uname)
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PINGFILE="/usr/local/bin/ping.list" # List of nodes to ping
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if [ -s $PINGFILE ]
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then
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# Ping all nodes in the list that are not commented out and blank
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PINGLIST=$(cat $PINGFILE | egrep -v '^#')
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else
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echo "\nERROR: Missing file - $PINGFILE"
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echo "\nList of nodes to ping is unknown...EXITING...\n"
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exit 2
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fi
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MAILFILE="/usr/local/bin/mail.list" # List of persons to notify
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if [ -s $MAILFILE ]
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then
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# Ping all nodes in the list that are not commented out and blank
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MAILLIST=$(cat $MAILFILE | egrep -v '^#')
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else
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echo "\nERROR: Missing file - $MAILFILE"
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echo "\nList of persons to notify is unknown...\n"
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echo "No one will be notified of unreachable nodes...\n"
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fi
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PING_OUTFILE="/tmp/pingfile.out" # File for emailed notification
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>$PING_OUTFILE # File for emailed notification
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integer INTERVAL="3" # Number of seconds to sleep between retries
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PINGSTAT= # Number of pings received back from pinging a node
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PINGSTAT2= # Number of pings received back on the second try
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THISHOST=`hostname` # The hostname of this machine
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########################################################
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############ DEFINE FUNCTIONS HERE #####################
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########################################################
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function ping_host
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{
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# This function pings a single node based on the Unix flavor
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# set -x # Uncomment to debug this function
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# set -n # Uncomment to check the syntax without any execution
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# Look for exactly one argument, the host to ping
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if (( $# != 1 ))
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then
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echo "\nERROR: Incorrect number of arguments - $#"
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echo " Expecting exactly one augument\n"
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echo "\t...EXITING...\n"
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exit 1
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fi
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HOST=$1 # Grab the host to ping from ARG1.
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# This next case statement executes the correct ping
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# command based on the Unix flavor
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case $UNAME in
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AIX|OpenBSD|Linux)
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ping -c${PING_COUNT} $HOST 2>/dev/null
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;;
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HP-UX)
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ping $HOST $PACKET_SIZE $PING_COUNT 2>/dev/null
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;;
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SunOS)
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ping -s $HOST $PACKET_SIZE $PING_COUNT 2>/dev/null
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;;
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*)
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echo "\nERROR: Unsupported Operatoring System - $(uname)"
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echo "\n\t...EXITING...\n"
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exit 1
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;;
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esac
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}
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#######################################################
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function ping_nodes
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{
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#######################################################
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#
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# Ping the other systems check
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#
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# This can be disabled if you do not want every node to be pinging all of the
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# other nodes. It is not necessary for all nodes to ping all other nodes.
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# Although, you do want more than one node doing the pinging just in case
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# the pinging node is down. To activate pinging the "$PINGNODES" variable
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# must be set to "TRUE". Any other value will disable pinging from this node.
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#
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# set -x # Uncomment to debug this function
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# set -n # Uncomment to check command syntax without any execution
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if [ $PINGNODES = "TRUE" ]
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then
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echo # Add a single line to the output
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# Loop through each node in the $PINGLIST
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for HOSTPINGING in $PINGLIST # Spaces between nodes in the
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# list is assumed
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do
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# Inform the user what is going On
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echo "Pinging --> ${HOSTPINGING}...\c"
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# If the pings received back is equal to "0" then you have a
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# problem.
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# Ping $PING_COUNT times, extract the value for the pings
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# received back.
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PINGSTAT=$(ping_host $HOSTPINGING | grep transmitted \
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| awk '{print $4}')
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# If the value of $PINGSTAT is NULL, then the node is
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# unknown to this host
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if [[ -z "$PINGSTAT" && "$PINGSTAT" = '' ]]
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then
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echo "Unknown host"
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continue
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fi
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if (( $PINGSTAT == 0 ))
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then # Let's do it again to make sure it really is reachable
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echo "Unreachable...Trying one more time...\c"
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sleep $INTERVAL
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PINGSTAT2=$(ping_host $HOSTPINGING | grep transmitted \
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| awk '{print $4}')
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if [ $PINGSTAT2 -eq "0" ]
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then # It REALLY IS unreachable...Notify!!
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echo "Unreachable"
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echo "Unable to ping $HOSTPINGING from $THISHOST" \
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| tee -a $PING_OUTFILE
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else
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echo "OK"
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fi
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else
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echo "OK"
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fi
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done
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fi
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}
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######################################################
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function send_notification
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{
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if [ -s $PING_OUTFILE -a "$MAILOUT" = "TRUE" ];
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then
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case $UNAME in
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AIX|HP-UX|Linux|OpenBSD) SENDMAIL="/usr/sbin/sendmail"
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;;
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SunOS) SENDMAIL="/usr/lib/sendmail"
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;;
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esac
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echo "\nSending email notification"
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$SENDMAIL -f randy@$THISHOST $MAILLIST < $PING_OUTFILE
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fi
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}
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##################################################
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############ START of MAIN #######################
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##################################################
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ping_nodes
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send_notification
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# End of script
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