Dav’s bit o the web

This was one of those tasks that was quicker to write my own than it was to Google up one of the several hundred other identical monitoring scripts.

This script monitors whether or not a host is responding to ICMP and can be happily set to a resolution of 1 second. It’s written in bash and will happily run on my linux. It should run on yours, too.


./pingit 1 myHostname.dyndns.org > /var/log/myIspIsNotIdeal.log


#!/bin/sh
if [ $# -ne 2 ]
  then
  echo "Usage: $0 <timeout in seconds> <hostname to ping>"
  exit 1
fi
while true
do
  echo -n "$(date) "
  ping -q -c 1 -W $1 $2 > /dev/null
  case $? in
  1)
    echo "down"
    ;;
  0)
    echo "ok"
    sleep $1
    ;;
  2)
    echo "the damage report machine has exploded"
    ;;
  esac
done

Run it and redirect its output to a file for later grepping. Once I’m happy its bedded in and working, and I’ve finished tarting it about a bit, I’ll make it only output a line on failure.

This entry was posted on Tuesday, June 16th, 2009 at 2:24 pm and is filed under General Gubbins. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.