[Linux-cluster] Network Monitor

[amrossi at linux.it]

Hi all,

i've Failover Domain (two nodes) with Red Hat Cluster Suite (RHEL5).

I'm writting  little script to control network status; this script running
under rgmanager with other script (apache|tomcat|..).

################################################################

#!/bin/bash

DEVICE="eth0"
hosts="www.google.it www.iol.it www.ansa.it www.virgilio.it"
MINIMO="2"
STATUS="true"

status() {
    ip addr show | grep $DEVICE | grep "NO-CARRIER"  > /dev/null 2>&1
    if [ "$?" = "0" ] ; then
        echo "Warning. Network Down."
        STATUS="false"
    else
        c=0
        for host in $hosts ;  do
          fping -a $host > /dev/null 2>&1
          if [ "$?" -eq "1" ] ; then
               echo $((++c)) > /dev/null 2>&1
               if [ "$c" -eq "$MINIMO" ] ;  then
                   echo "Warning. Network Down."
                   STATUS="false"
               fi
         fi
        done
    fi
}
start() {
   status
}

stop() {
   status
}

restart() {
   status
}

ip addr show | grep $DEVICE > /dev/null 2>&1
if [ "$?" != "0" ] ; then
     echo "$DEVICE not Found"
     STATUS="false"
fi

if [ -z "$1" ] ; then
    command="status"
else
    command="$1"
fi

case "$command" in
    'status')
        status
        ;;
    'start')
        start
        ;;
    'stop')
        stop
        ;;
    'restart')
        restart
        ;;
    *)
        echo "Usage: $0 { start | stop | restart | status }"
        STATUS="false"
        ;;
esac

if [ "$STATUS" == "true" ] ; then
     exit 0
else
     exit 1
fi


########################################################################



It's OK?