nginx_memory

#!/usr/bin/perl -w
# -*- mode: cperl; mode: autopair -*-
# Magic markers:
#%# family=auto
#%# capabilities=autoconf
# nginx_memory --- Munin plugin for monitoring Nginx memory
#                  usage. Based on the nginx_memory.pl plugin
#                  by AkyRhO <akyrho@gmail.com>.

# 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_memory - Munin plugin to show the RAM used by nginx.

=encoding utf8

=head1 APPLICABLE SYSTEMS

Any nginx host

=head1 MAGIC MARKERS

  #%# family=auto
  #%# capabilities=autoconf

=head1 VERSION

1.0

=head1 BUGS

FreeBSD Security process in sysctl security.bsd.see_other_uids=0 and security.bsd.see_other_gids=0 error stop.

=head1 AUTHOR

Based on a script by AkyRhO <akyrho@gmail.com>. Modified by António
Almeida <appa@perusio.net>

=head1 REPOSITORY

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

=head1 LICENSE

MIT

=cut

## Munin config method.
if (exists $ARGV[0] and $ARGV[0] eq "config") {
  print "graph_title nginx RAM usage\n";
  print "graph_vlabel RAM\n";
  print "graph_category nginx\n";
  print "ram.label RAM\n";
  print "graph_args --base 1024\n";

  exit 0;
} else {

  ## Get the current OS name.
  my $osname = $^O;

  if ($osname eq 'freebsd') {   # FreeBSD
    my $pid_nginx = "pgrep -d ' ' nginx";
  } else {                      # Linux
    my $pid_nginx = "pidof nginx";
  }

  my $m = `ps u -p \$(pgrep -d ' ' nginx) | awk 'NR > 1 {nm += \$5} END {print nm*1024}'`;

  print "ram.value $m";
}