Munin contributed plugins

#!/usr/bin/perl -w

# -*- cperl -*-

# Magic markers:

#%# family=auto

#%# capabilities=autoconf

# nginx_status --- Determine the current status of Nginx

#                  using the http_stub_status module.

# Copyright (C) 2010 António P. P. Almeida <appa@perusio.net>

# Author: António P. P. Almeida <appa@perusio.net>

# Permission is hereby granted, free of charge, to any person obtaining a

# copy of this software and associated documentation files (the "Software"),

# to deal in the Software without restriction, including without limitation

# the rights to use, copy, modify, merge, publish, distribute, sublicense,

# and/or sell copies of the Software, and to permit persons to whom the

# Software is furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# Except as contained in this notice, the name(s) of the above copyright

# holders shall not be used in advertising or otherwise to promote the sale,

# use or other dealings in this Software without prior written authorization.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

# DEALINGS IN THE SOFTWARE.

=head1 NAME

nginx_status - Munin plugin to show the connection status for nginx

=encoding utf8

=head1 APPLICABLE SYSTEMS

Any nginx host

=head1 CONFIGURATION

This shows the default configuration of this plugin.  You can override

the status URL and the User Agent.

  [nginx*]

      env.url http://localhost/nginx_status

      env.ua nginx-status-verifier/0.1

Nginx must also be configured.  Firstly the stub-status module must be

compiled, and secondly it must be configured like this:

  server {

        listen 127.0.0.1;

        server_name localhost;

        location /nginx_status {

                stub_status on;

                access_log   off;

                allow 127.0.0.1;

                deny all;

        }

  }

=head1 MAGIC MARKERS

  #%# family=auto

  #%# capabilities=autoconf

=head1 VERSION

1.1

=head1 BUGS

None known

=head1 AUTHOR

Unknown. Mantained by António Almeida <appa@perusio.net>

=head1 REPOSITORY

Source code at http://github.com/perusio/nginx-munin

=head1 LICENSE

MIT

=cut

my $ret = undef;

if (! eval "require LWP::UserAgent;") {

  $ret = "LWP::UserAgent not found";

}

chomp(my $fqdn=`hostname -f`);

## Environment defined variables.

## The default URL is nginx_status if different set it in the environment.

my $URL = exists $ENV{'url'} ? $ENV{'url'} : "http://$fqdn/nginx_status";

## The default user agent is ngnix-status-verifier/0.1 if different

## set it in the environment.

my $UA = exists $ENV{'ua'} ? $ENV{'ua'} : 'nginx-status-verifier/0.1';

## Munin autoconf method.

if (exists $ARGV[0] and $ARGV[0] eq "autoconf" ) {

  if ($ret) {

    print "no ($ret)\n";

    exit 1;

  }

  my $ua = LWP::UserAgent->new(timeout => 30);

  # Set the UA to something different from the libwww-perl.

  # This UA is blocked.

  $ua->agent($UA);

  my $response = $ua->request(HTTP::Request->new('GET',$URL));

  unless ($response->is_success and $response->content =~ /server/im) {

    print "no (no nginx status on $URL)\n";

    exit 1;

  } else {

    print "yes\n";

    exit 0;

  }

}

## Munin config method.

if (exists $ARGV[0] and $ARGV[0] eq "config") {

  print "graph_title NGINX status\n";

  print "graph_args --base 1000\n";

  print "graph_category nginx\n";

  print "graph_vlabel Connections\n";

  print "total.label Active connections\n";

  print "total.info  Active connections\n";

  print "total.draw LINE2\n";

  print "reading.label Reading\n";

  print "reading.info  Reading\n";

  print "reading.draw LINE2\n";

  print "writing.label Writing\n";

  print "writing.info  Writing\n";

  print "writing.draw LINE2\n";

  print "waiting.label Waiting\n";

  print "waiting.info  Waiting\n";

  print "waiting.draw LINE2\n";

  exit 0;

}

my $ua = LWP::UserAgent->new(timeout => 30);

# Set the UA to something different from the libwww-perl.

# That UA is blocked.

$ua->agent($UA);

my $response = $ua->request(HTTP::Request->new('GET',$URL));

# Active connections: 1845

# server accepts handled requests

# 4566318 4566318 84218236

# Reading: 2 Writing: 278 Waiting: 1565

if ($response->content =~ /Active connections:\s+(\d+).*Reading:\s+(\d+).*Writing:\s+(\d+).*Waiting:\s+(\d+)/s) {

  print "total.value $1\n";

  print "reading.value $2\n";

  print "writing.value $3\n";

  print "waiting.value $4\n";

} else {

  foreach (qw(total reading writing waiting)) {

    print "$_.value U\n";

  }

}