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Initial version

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rti 2011-06-04 23:29:47 +02:00 committed by Steve Schnepp
parent 08fbbcfa0b
commit b16cf44282
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plugins/other/pg__connections Executable file
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#!/usr/bin/perl -w
# Plugin for monitor postgres connections without DBI.
#
# Licenced under GPL v2.
#
# Usage:
#
# Symlink into /etc/munin/plugins/ and add the monitored
# database to the filename. e.g.:
#
# ln -s /usr/share/munin/plugins/pg__connections \
# /etc/munin/plugins/pg_<databasename>_connections
# This should, however, be given through autoconf and suggest.
#
# If required, give username, password and/or Postgresql server
# host through environment variables.
#
# You must also activate Postgresql statistics. See
# http://www.postgresql.org/docs/7.4/interactive/monitoring-stats.html
# for how to enable this. Specifically, the following lines must
# exist in your postgresql.conf:
#
# stats_start_collector = true
# stats_block_level = true
#
#
# Parameters:
#
# config (required)
#
# Config variables:
#
# dbhost - Which database server to use. Defaults to
# 'localhost'.
# dbname - Which database to use. Defaults to template1
# dbuser - A Postgresql user account with read permission to
# the given database. Defaults to
# 'postgres'. Anyway, Munin must be told which user
# this plugin should be run as.
# dbpass - The corresponding password, if
# applicable. Default to undef. Remember that
# pg_hba.conf must be configured accordingly.
#
# Magic markers
#%# family=auto
#%# capabilities=autoconf
use strict;
my $psql = $ENV{'psql'} || '/usr/bin/psql';
my $dbhost = $ENV{'dbhost'} || '127.0.0.1';
my $dbname = $ENV{'dbname'} || 'template1';
my $dbuser = $ENV{'dbuser'} || 'munin';
#my $dbuserx = $ENV{'dbuserx'} || '';
my $dbport = $ENV{'dbport'} || '5432';
my $dbpass = $ENV{'dbpass'} || 'munin';
my $COMMAND = "PGPASSWORD='$dbpass' '$psql' '$dbname' -h '$dbhost' -U '$dbuser' -p '$dbport' -A -F, -t ";
if (exists $ARGV[0]) {
if ($ARGV[0] eq "config") {
my $sqlCommand = "$COMMAND -c 'SHOW max_connections;'";
my ($max_connections) = `$sqlCommand`;
my $warning = int ($max_connections * 0.7);
my $critical = int ($max_connections * 0.8);
print "graph_title PostgresSQL active connections\n";
print "graph_args -l 0 --base 1000\n";
print "graph_vlabel Connections\n";
print "graph_category Postgresql\n";
print "graph_info Shows active Postgresql connections from $dbname\n";
$sqlCommand = "$COMMAND -c 'select datname, count(*) from pg_stat_activity group by datname;'";
open(SERVICE, "$sqlCommand |")
or die("Could not execute '$sqlCommand': $!");
my $setarea = "yes";
while (<SERVICE>) {
my ($datname, $curr_conn) = (m/(\w+).*?(\d+(?:\.\d+)?)/);
print "$datname.label $datname active connections\n";
print "$datname.info $datname active connections\n";
print "$datname.type GAUGE\n";
if ($setarea eq "yes") {
print "$datname.draw AREA\n";
$setarea="";
} else {
print "$datname.draw STACK\n";
}
}
print "max_connections.label Max. connections\n";
print "max_connections.info Max. connections\n";
print "max_connections.type GAUGE\n";
print "warning $warning\n";
print "critical $critical\n";
exit 0;
}
}
# select datname, count(*) from pg_stat_activity group by datname
my $sqlCommand = "$COMMAND -c 'SHOW max_connections;'";
my ($max_connections) = `$sqlCommand`;
$sqlCommand = "$COMMAND -c 'select datname, count(*) from pg_stat_activity group by datname;'";
open(SERVICE, "$sqlCommand |")
or die("Could not execute '$sqlCommand': $!");
while (<SERVICE>) {
my ($datname, $curr_conn) = (m/(\w+).*?(\d+(?:\.\d+)?)/);
print "$datname.value $curr_conn\n";
}
print "max_connections.value $max_connections\n";