parent/child pains

[Andreas Ericsson]

Holger Weiss wrote:
> * Rossz Vamos-Wentworth <rossz at vamos-wentworth.org> [2005-10-21 11:56]:
> 
>>I definately need to get this mess done right because in a week I start 
>>a new job and one of the things I will be taking care of is setting up a 
>>Nagios system for a large number of hosts and services.  Doing it wrong 
>>will multiple this morning's alert problems by a thousand fold! :(
> 
> 
> FWIW, I set "parents" simply by tracerouting to the hosts specified in
> the Nagios configuration via "address" and then using (the first part
> of) the name of the last hop prior to the host:
> 

This won't work if you're monitoring layer 2 switches, since they don't 
appear in a traceroute.

It's a nice script though.

>   #!/usr/bin/perl -w
>   #
>   # $ cp hosts.cfg hosts.cfg.bak
>   # $ setparents.pl < hosts.cfg.bak > hosts.cfg
>   #
>   sub traceroute ($) {
>   	my $host = shift;
>   	my @hops = `/usr/bin/traceroute -I $host 2>/dev/null`;
>   	die "traceroute -I $host failed" if $? >> 8 != 0;
>   	return undef unless @hops > 1; # ignore local hosts
>   	die "parse error" unless $hops[-2] =~ /\s+\d+\s+([\w-]+)/;
>   	$1;
>   }
>   for (<>) {
>   	print unless /^\s*parents/;
>   	if (/^\s*address\s+([\w\.-]+)/) {
>   		if (defined (my $parent = traceroute($1))) {
>   			print "\tparents $parent\n";
>   		}
>   	}
>   }
> 
> Whether this works and whether it makes sense depends on the network
> layout, of course.
> 
> Holger
> 

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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