Munin contributed plugins

#!/usr/bin/env ruby

#

# Munin Plugin for PGA memory components monitoring

#

# Author: Wilfred Chau <openapp.developer@gmail.com>

# Date: 2011-05-13

# Version: 1.0

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License version 2

# as published by the Free Software Foundation.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License along

# with this program; if not, write to the Free Software Foundation, Inc.,

# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#

#

# Prerequistes:

#	1) env.ORACLE_HOME set in munin-node

#	2) rubygems

#	3) oci8 - DBI gem for connecting to Oracle

#	   * instruction of installing oci8 is available here:

#	     http://ruby-oci8.rubyforge.org/en/InstallBinaryPackage.html

#

# Usage:

#	1) copy this script to the munin install plugins directory (e.g. /usr/share/munin/plugins)

#	2) chmod to allow executable to others

#	3) create symbolic link in /etc/munin/plugins

#          ln -s /usr/share/munin/plugins/oracle_<sid>_pga.rb /etc/munin/plugins/oracle_<sid>_pga.rb

#          ** replace <sid> with your oralce sid

#

# Parameters:

#	autoconf

#	config (required)

#

# Configurable variables:

#	orauser : oracle user who has select privilege to query v$pgastat view

#	orapass : password for the oracle user

#	dbport  : port used by the monitored instance (notice: numeric value)

#	dbname  : database to be monitored

#	dbhost  : host or ip address of db instance

#

#

#%# family=auto

#%# capabilities=autoconf

require 'rubygems'

require 'oci8'

orauser  = 'munin'

orapass  = 'munin'

dbport   = 1522

dbname   = 'orcl'

dbhost   = 'localhost'

tnsname  = "(DESCRIPTION =

            (ADDRESS = (PROTOCOL = TCP)(HOST = #{dbhost})(PORT = #{dbport}))

            (CONNECT_DATA = (SID = #{dbname})))"

def runQuery (name,query)

	rows = $conn.exec(query)

	puts "#{name}.value #{rows.fetch().to_s}"

        rows.close

end

#

# Queries

#

pga_target_query = "SELECT TO_CHAR(ROUND(decode(unit,'bytes',(value)/(1024*1024),value),2)) pga_target

                    from V$PGASTAT where name = 'aggregate PGA target parameter'"

pga_query = "SELECT TO_CHAR(ROUND(decode(unit,'bytes',(value)/(1024*1024),value),2)) pga

                     from V$PGASTAT where name = 'total PGA inuse'"

pga_components = { "pga_target"  => pga_target_query,

                   "pga_in_use"  => pga_query

                 }

#

# autoconf

#

if ARGV[0] == "autoconf"

	if tnsname.length > 1 && orauser.length > 1 && orapass.length > 1

		puts "yes"

	else

		puts "no"

		puts "Usage: #{__FILE__} autoconf|conf"

	end

	exit 0

#

# config definition

#

elsif ARGV[0] == "config"

	puts "graph_args --base 1024k -r --lower-limit 0"

	puts "graph_title Oracle PGA from #{dbname}"

	puts "graph_category db"

	puts "graph_info This graph shows the PGA memory usage (in MB)"

	puts "graph_vlabel MB"

	puts "graph_scale no"

	puts "graph_period second"

	pga_components.keys.each do |p|

		puts "#{p}.label #{p}"

		puts "#{p}.info PGA: #{p}"

		puts "#{p}.type GAUGE"

		puts "#{p}.draw LINE1"

	end

	exit 0

end

$conn = OCI8.new(orauser, orapass, tnsname)

pga_components.each do |pc, query|

	runQuery(pc, query)

end

$conn.logoff