[ale] lightweight testing for remote services

[Keith Hopkins]

Hi folks,

  Anyone know a lightweight way to test if a service (dns,http,ssh,insert-your-favorite-protocol-here) is being serviced on a remote server?

  Currently, I have something like this in a shell script as...

#!/bin/bash
REMOTE=10.0.0.1
PORT=53
PORTNAME=domain
while true
do
  nmap -p $PORT $REMOTE | grep $PORTNAME
  if [ ! $? = 0 ]; then
    # Do something important
  fi
  sleep 5
done

  This works, but each time nmap/grep runs, it chews more CPU than I want to give to this process.  Anyone know a "lighter" way?

-- 
Lost in Tokyo,
  Keith


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