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#!/usr/bin/perl
#
# This plugin is based off of the Connection Usage
# section of the MySQL Connection Health Page
#
# http://dev.mysql.com/doc/administrator/en/mysql-administrator-health-connection-health.html
#
# To enable, link mysql_connections to this file. E.g.
#
# ln -s /usr/share/node/node/plugins/mysql_connections /etc/munin/plugins/mysql_connections
#
# Revision 1.0 2007/08/03
# Created by Justin Shepherd <galstrom21@gmail.com>
#
# Parameters:
#
# config
# autoconf
#
# Configuration variables
#
# mysqlopts - Options to pass to mysql
# mysqladmin - Override location of mysqladmin
# warning - Override default warning limit
# critical - Override default critical limit
#
#%# family=auto
#%# capabilities=autoconf
use strict;
# Define the mysqladmin paths, and commands
my $MYSQLADMIN = $ENV{mysqladmin} || "mysqladmin";
my $TEST_COMMAND = "$MYSQLADMIN $ENV{mysqlopts} extended-status";
my $MYSQL_VARIABLES = "$MYSQLADMIN $ENV{mysqlopts} extended-status variables";
my $warning = $ENV{warning} || "80";
my $critical = $ENV{critical} || "90";
# Pull in any arguments
my $arg = shift();
# Check to see how the script was called
if ($arg eq 'config') {
print_graph_information();
exit();
} elsif ($arg eq 'autoconf') {
if (test_service()) { print "yes\n"; }
else { print "no\n"; }
exit;
} else {
# Define the values that are returned to munin
my ($available, $current, $upper_limit) = (0,0,0);
# Gather the values from mysqladmin
$current = poll_variables($MYSQL_VARIABLES,"Threads_connected");
$upper_limit = poll_variables($MYSQL_VARIABLES,"max_connections");
$available = $upper_limit - $current;
# Return the values to Munin
print "current.value $current\n";
print "available.value $available\n";
}
sub poll_variables {
my $command = shift;
my $expression = shift;
my $ret = 0;
open(SERVICE, "$command |")
or die("Coult not execute '$command': $!");
while (<SERVICE>) {
my ($field, $value) = (m/(\w+).*?(\d+(?:\.\d+)?)/);
next unless ($field);
if ($field eq $expression ) {
$ret = "$value";
}
}
close(SERVICE);
return $ret;
}
sub print_graph_information {
print <<EOM;
graph_title MySQL Connections
graph_args --base 1000 -l 0
graph_vlabel Connections
graph_info The number of current connections with respect to the max_connections setting.
graph_category mysql
graph_order current available
graph_total Total
current.label In Use
current.draw AREA
current.info The number of current threads connected
current.warning $warning
current.critical $critical
available.label Available
available.draw STACK
available.info The current value of the "max_connections" variable
EOM
}
sub test_service {
my $return = 1;
system ("$MYSQLADMIN --version >/dev/null 2>/dev/null");
if ($? == 0)
{
system ("$TEST_COMMAND >/dev/null 2>/dev/null");
if ($? == 0)
{
print "yes\n";
$return = 0;
}
else
{
print "no (could not connect to mysql)\n";
}
}
else
{
print "no (mysqladmin not found)\n";
}
exit $return;
}
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