parent/child pains

[Holger Weiss]

* 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:

  #!/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

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