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Forum Discussion

Ofir_73471's avatar
Ofir_73471
Icon for Nimbostratus rankNimbostratus
Jun 06, 2009

Assistance with writing an External Monitor

Hi,     I need to sample my servers by sending a UDP packet and if i am getting an answer meaning the server is up .   i have used netcat and it works but i dnot know how to write the ...
config
design
hwidjaja_37598's avatar
hwidjaja_37598
Icon for Altostratus rankAltostratus
Jun 06, 2009
Try this: 

  
  !/bin/sh  
   Adopted from /usr/bin/monitors/sample_monitor  
    
  
  pidfile="/var/run/pinger.$1..$2.pid"  
  
  if [ -f $pidfile ]  
  then  
     kill -9 `cat $pidfile` > /dev/null 2>&1  
  fi  
  
  echo "$$" > $pidfile  
  
  node_ip=`echo $1 | sed 's/::ffff://'`  
  
  nc -w -u -w 3 -o /root/x-reply.hex $node_ip $2 < /root/x.hex > /dev/null  
  
  status=$?  
  if [ $status -eq 0 ]  
  then  
      echo "up"  
  fi  
  
  rm -f $pidfile

Don't forget to make the script executable (e.g. chmod a+x