Black Box LES1348A, LES1332A, LES1408A, LES144BA, LES1416A, LES1432A, LES1316A Ping-detect script

The above command will cause the ping-detectscript to continuously ping the host at 192.168.22.2 which is the router. If the router crashes, it will no longer respond to ping requests. If this happens, the two commands pmpower and date will run. The output from these commands is sent to the file /tmp/output.log so that we have a record. The ping-detectis also run in the background using the "&".

Remember the rc.local script only runs by default when the system boots. You can manually run the rc.local script or the ping-detectscript if desired.

The ping-detect script

The above is just one example of using the ping-detectscript. The idea of the script is to run any number of commands when a specific host stops responding to ping requests. Here are details of the ping-detectscript itself:

#!/bin/sh

#Usage: ping-detect HOST [COMMANDS...]

#This script takes 2 types of arguments: hostname/IPaddress to ping, and the commands to

#run if the ping fails 5 times in a row. This script can only take one host/IPaddress per

#instance. Multiple independent commands can be sent to the script. The commands will be

#run one after the other.

#

#PINGREP is the entire reply from the ping command

#LOSS is the percentage loss from the ping command

#$1 must be the hostname/IPaddress of device to ping

#$2... must be the commands to run when the pings fail. COUNTER=0

TARGET="$1" shift

#loop indefinitely:

while true do

#ping the device 10 times PINGREP=`ping -c 10 -i 1 "$TARGET" ` #get the packet loss percentage

LOSS=`echo "$PINGREP" grep "%" sed -e 's/.* \([0-9]*\)% .*/\1/'` if [ "$LOSS" -eq "100" ]

then

COUNTER=`expr $COUNTER + 1`

else

COUNTER=0 sleep 30s

fi

if [ "$COUNTER" -eq 5 ] then

COUNTER=0 "$@" sleep 2s

fi

done

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