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fork the mysql_connections plugin to add per-user support

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Antoine Beaupré 2014-01-02 17:42:28 -05:00
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commit c223def9d5
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plugins/mysql/mysql_connections_per_user Executable file
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#!/usr/bin/perl
#
# Copyright (C) 2008 Rackspace US, Inc. <http://www.rackspace.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# 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, see http://www.gnu.org/licenses/gpl.txt
#
#
# 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>
#
# Revision 2.0 2013/01/02
# Per user support by anarcat@koumbit.org
#
# 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} processlist";
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 ($arg eq 'autoconf') {
if (test_service()) { print "yes\n"; }
else { print "no\n"; }
exit;
} else {
# Define the values that are returned to munin
my ($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");
# Return the values to Munin
print "current.value $current\n";
print "limit.value $upper_limit\n";
my $threads = get_thread_list();
my %counts = ();
my ($thread, $user, $count);
while (($thread, $user) = each %$threads) {
$counts{$user} = 0 unless defined($counts{$user});
$counts{$user} += 1;
}
while (($user, $count) = each %counts) {
print "$user.value $count\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 --lower-limit 0
graph_vlabel Connections
graph_info The number of current connexions per user.
graph_category mysql
graph_total Total
current.label In Use
current.draw LINE1
current.info The number of current threads connected
current.warning $warning
current.critical $critical
limit.label Maximum
limit.draw LINE1
limit.info The current value of the "max_connections" variable
EOM
my $threads = get_thread_list();
my %seen = ();
my ($thread, $user);
while (($thread, $user) = each %$threads) {
# display user only once
if (defined($seen{$user})) {
next;
}
else {
$seen{$user} = 1;
print <<EOM;
$user.label Connexions for user $user
$user.info Number of connexions used by user $user
EOM
print "$user.draw ";
# if we already printed an entry, make the next ones stacked
if (scalar %seen) {
print "STACK\n";
}
else {
print "AREA\n";
}
}
}
}
sub get_thread_list {
my %threads = ();
my $command = 'mysql -N -B -e "SHOW PROCESSLIST;"';
open(SERVICE, "$command |")
or die("Could not execute '$command': $!");
while (<SERVICE>) {
my ($threadid, $user) = split "\t";
next unless ($threadid);
$threads{$threadid} = $user;
}
return \%threads;
}
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;
}