monitoning services

seefor · 03-28-2006, 08:46 PM

Greetings all,

I'm new to Linux and was looking around for some kind of software that monitors your service(s).
If a service stop it will send out an email. Is there anything like that out there?

Thanks in advance,
Sif aka SeeFor

gilead · 03-28-2006, 09:13 PM

Are you talking about a home PC or do you have several PCs in an office? Nagios (http://www.nagios.org/) is probably overkill for home, but is useful in an office.

Alternatively, set up a cron job that scans your open ports and emails you when one of them no longer accepts connections.

seefor · 03-28-2006, 09:39 PM

gilead thank you very much.

It's for the office, we have six new Linux servers and I'm now learning Linux

Thanks for your advice.

Not sure how to setup a cron job to scan open ports. So I will start off by looking in to Nagios.

Thanks again!

-Sif aka SeeFor

gilead · 03-29-2006, 06:39 AM

If you have nmap installed you can create a cron job in (for example) /etc/cron.hourly called stopped-daemons.sh that contains the following (change the port numbers to those you want to monitor):

Code:

#!/bin/sh

for CLOSED in "$(/usr/local/bin/nmap -p 22,80,443 localhost | /usr/bin/grep 'closed' | /usr/bin/awk {'print $1'})"; do
  if [ ! -z "$CLOSED" ]; then
    echo "Port $CLOSED has closed."
  fi
done

cron should email any output to you and there should only be output if one the ports 22, 80 or 443 becomes closed.