Re: One script for many data items

--On Friday, September 28, 2012 7:07 PM +0200 Gandalf <[email protected]> 
wrote:

> In this case, I'd like to advise a two step approach.
> Step 1: Poll the data and put them into some intermediate store (e.g. a
> file, a database table)
> Step 2: Poll the data from that store.
> This latter one is the "usual" Data Input Method associated with a graph
> etc. pp. The first step can be put as an initial script being run
> directly from crontab or by some single Cacti data source which needs not
> to be associated with any graph.

Thanks. I've now developed step 1:

#!/usr/bin/env perl

# collect byte counters from dummy iptables rules in chains with name
# that starts with cacti

use IO::LockedFile;

# read all chains atomically, with byte and packet counters
my @iptables = split(/\n/, `/sbin/iptables-save -c`);

# acquire output file for writing with exclusive lock
my $cacti_iptables_counters
        = new IO::LockedFile(">/tmp/cacti_iptables_counters");

foreach my $line (@iptables) {
        $cacti_iptables_counters->print("$1\t$2\n")
                if $line =~ m/\[(\d+):\d+\] -A cacti-(\S+)/;
}





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