Simple Admin Tricks: Quick & Dirty Monitoring

Posted on 26 March 2010 at 07:16

From time to time, you’ll need to monitor a port to see if there’s a problem brewing.  For smaller companies, it can be quite a chore to deploy some sort of commercial or open-source monitoring solution (e.g., NAGIOS-based stuff), when all you want to do is do some quick and dirty monitoring. Example: you just want to check if a port is up or down and be alerted immediately so you can troubleshoot without having to go through a complicated configuration process.

Well, there are a ton of command-line tools that let you do just that.

For our example, we need two tools:

portqry.exe:
this is basically a port pinger

Written by Microsoft
Description: http://support.microsoft.com/kb/310099
Download link:http://www.microsoft.com/downloads/details.aspx?familyid=89811747-C74B-4638-A2D5-AC828BDC6983&displaylang=en

bmail.exe:
this is a simple command line tool to send an email using a batch file

Written by Craig Peacock from Beyond Logic
http://www.beyondlogic.org/solutions/cmdlinemail/cmdlinemail.htm

So, how does this work?

All you need is a simple batch file that you would call from Windows Task Scheduler, e.g. every 5 or 10 minutes:

<ip> = IP or Name of the machine you want to check
<port> = port you want to check

The default timeout is 30 seconds.

@echo off
portqry -n <ip> -e <port> -p TCP -q
if %ERRORLEVEL% == 0 goto allok
:somethingiswrong
bmail -s mail.yourmailrelay.com -p 25 -t 4135551212@phoneprovide.com -f alerter@yourdomain.com -h -a “port is down or saturated”
:allok

And there you go!

Every time the batch file runs, it checks to see if it can reach the port you specify: if it can’t, it’ll send an email through the relay server of your choice and send an alert to your cell phone.

Too easy smile

 

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