[NTLUG:Discuss] Service Watchdog Script

[Brian Koontz]

On Mon, Oct 05, 2009 at 10:03:30AM -0700, CoryC wrote:
> Does anybody have an example of a service watchdog script that they
> are willing to share? All of the examples I'm finding on the
> Internet only work if the service uses a port but not all of the
> services I want to monitor use a port (Snort, arpwatch, etc.). I'd
> like for it to be able to e-mail me when one of those services are
> down and possibly even try to restart it. I'm using CentOS 5.3.

This works for me, took about 5 minutes to throw together.  Replace
the parts you need.  (The latest version of SpamAssassin's spamd
daemon is rather buggy, just in case you're wondering.) 

I put it in crontab and have it e-mail me the output.

#! /usr/bin/perl
# monitorSpamd.pl -- Monitor spamd and respawn if necessary
#
#####################################################################
use strict;
my $found = 0;
my @results = `ps ax | grep spamd`;
foreach(@results)
{
    if(/\/usr\/bin\/spamd/)
    {
        $found = 1;
    }
}
if(!$found)
{
    print "Restarting spamd...";
    system("/usr/bin/spamd -r /var/log/spamd/spamd.pid -d");
    print "...done!";
}


  --Brian