Re: Program for watching running programs

[Brian Candler <B.Candler at pobox.com>]

> > I am running Red Hat Linux 7.2.
> > Do anybody know where can i find a script or a program that can keep
> > watching all or some running programs and send a warning  email to the root
> > everytime a program stop running ?

Where I work we have little scripts to do this. They are shell scripts, but
perl is more flexible. Here's a 3-minute example:

--------------------------------------------------------------------------
#!/usr/bin/perl -w
use strict;

my  at processes = (
	'/usr/local/sbin/radiusd',
	'/usr/sbin/sendmail',
);

my $res;
open F, "ps auxwww |" or die "ps: $? $!";
while (<F>) { $res .= $_ };
close F;

my $err;
foreach my $p ( at processes) {
	unless ($res =~ $p) {
		$err .= "Monitored process '$p' is not running\n";
	}
}

if ($err) {
	my $host = `hostname`;
	chomp $host;
	open S, "| /usr/sbin/sendmail -t";
	print S <<END;
To: alerts\ at example.com
Subject: $host alert

$host: error detected
$err
END
	close S;
}

Untested, use at your own risk! But in this way you can develop a script
which also, for example, looks at the output of 'df -i' and reports when
partitions get more than 90% full or use more than 90% of available inodes.

Regards,

Brian.

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