clusterXL_monitor_arp

#!/bin/sh
#
# The script tries to ping the hosts written in the file $FWDIR/conf/cpha_arp_hosts. 
# The names (must be resolveable) to the IPs must be written on seperate lines. Second 
# argument in line is interface thru which we try to arping the host.
# The file must not contain anything else.
# example:
# 10.10.10.1 eth0
# 10.10.20.1 eth1
# 
# We ping the given hosts every number of seconds given as parameter to the script.
# USAGE:
# cpha_monitor_ips X silent
# where X is the number of seconds between loops over the IPs.
# if silent is set to 1, no messages will appear on the console
#
# We initially register a pnote named "arp_monitor" in the problem notification mechanism
# when we detect that a host is not responding we report the pnote to be in "problem" state.
# when ping succeeds again - we report the pnote is OK.

silent=0

if [ -n "$2" ]; then
        if [ $2 -le 1 ]; then
                silent=$2
        fi
fi
hostfile=$FWDIR/conf/cpha_arp_hosts
arch=`uname -s`
if [ $arch = "Linux" ]; then
        #system is linux
        arping="arping -q -f -w 1"
else
        arping="arping"
fi
$FWDIR/bin/cphaconf set_pnote -d arp_monitor -t 0 -s ok register
TRUE=1
while [ "$TRUE" ]
do
        result=1
        while IFS=: read -r line
        do
                ipaddr=`echo $line | cut -d' ' -f 1`
                interface=`echo $line | cut -d' ' -f 2`
                [ $silent = 0 ] && echo "arpinging $ipaddr on $interface using command $arping"
                if [ $arch = "Linux" ]; then
                        $arping -I $interface $ipaddr > /dev/null 2>&1
                else
                        $arping -I $interface $ipaddr $1 > /dev/null 2>&1
                fi
                status=$?
                if [ $status = 0 ]; then
                        [ $silent = 0 ] && echo " $hosts is alive"
                else
                        [ $silent = 0 ] && echo " $hosts is not responding"
                        result=0
                fi
        done < $hostfile

        [ $silent = 0 ] && echo "done arpinging"

        if [ $result = 0 ]; then
                [ $silent = 0 ] && echo " Cluster member should be down!"
                $FWDIR/bin/cphaconf set_pnote -d arp_monitor -s problem report
        else
                [ $silent = 0 ] && echo " Cluster member seems fine!"
                $FWDIR/bin/cphaconf set_pnote -d arp_monitor -s ok report
        fi
        [ "$silent" = 0 ] && echo "sleeping"
        [ -z "$1" ] && sleep $1 || sleep 60
done