Hi Monks,
I am trying to write a script to monitor the status of webservers in a subnet. 
#! /usr/bin/perl

use strict;
use warnings;
use Parallel::ForkManager;


my $pm = new Parallel::ForkManager(20);

foreach my $ip (0..255) {
        my $ip_add = sprintf("202.1.150.%s",$ip);
        #print $ip_add;
        my $pid = $pm->start and next;
        my @val = `nmap -sT $ip_add | grep http`;
        #print @val;
        if (@val) {
                foreach (@val) {
                        my $test = (split(/\s+/,$_))[1];
                        if ($test =~ m/open/) {
                                print "Web Server at $ip_add is runnin
+g.\n";
                                last;
                        }
                }
        }
        else {
                print "Web Server at $ip_add is Down.\n";
        }
        $pm->finish;
}

$pm->wait_all_children;

exit 0;

[download]

The problems i am facing are.
1)How to identify between webserver down(when it should not be) and no webserver on the machine

2)How to handle a situation where the webserver is running on some port other than default.
3)are there any tools or script resources i can use
Thanks,
chimni

In reply to Monitor webserver status on all machines in a subnet by chimni

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.