Date: Tue, 18 Dec 2001 13:16:06 -0500 From: devin-freebsdquestions@rintrah.org To: Garance A Drosihn <drosih@rpi.edu> Cc: freebsd-questions@freebsd.org Subject: Re: ping failure script Message-ID: <20011218131606.A81236@tharmas.rintrah.org> In-Reply-To: <p05101004b84536ec64a9@[128.113.24.47]>; from drosih@rpi.edu on Tue, Dec 18, 2001 at 01:10:43PM -0500 References: <113fc9110004.110004113fc9@mbox.com.au> <p05101004b84536ec64a9@[128.113.24.47]>
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On Tue, Dec 18, 2001 at 01:10:43PM -0500, Garance A Drosihn wrote:
> At 2:03 PM +1100 12/17/01, BSD Freak wrote:
> >I want to run a shell script from cron that has the following
> >logic but I am totally unsure where to start with the syntax.
> >It goes like this:
> >
> >IF 3 consecutive pings to my.host.com fail THEN
> >echo "Link is DOWN!!" | mail me@mycompany.com
> >end
>
> Check the 'fping' module in ports. It is designed to make this
> sort of checking much easier (particularly if you are checking
> multiple hosts).
>
fping even provides a sample perl script to do exactly that sort of checking
in the man page.
#!/usr/bin/perl
require 'open2.pl';
$MAILTO = "root";
$pid = &open2("OUTPUT","INPUT","/usr/local/sbin/fping -u");
@check=("slapshot","foo","foobar");
foreach(@check) { print INPUT "$_\n"; }
close(INPUT);
@output=<OUTPUT>;
if ($#output != -1) {
chop($date=`date`);
open(MAIL,"|mail -s 'unreachable systems' $MAILTO");
print MAIL "\nThe following systems are unreachable as of: $date\n\n";
print MAIL @output;
close MAIL;
}
--devin
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