RRD::Simple::Examples - Examples using RRD::Simple
use strict;
use RRD::Simple;
my $cmd = "/usr/bin/vmstat 2 3";
my $rrdfile = "vmstat-cpu.rrd";
my $rrd = RRD::Simple->new( file => $rrdfile );
my @keys = ();
my %update = ();
open(PH,"-|",$cmd) or die qq{Unable to open file handle PH for command "$cmd": $!};
while (local $_ = <PH>) {
next if /---/;
s/^\s+|\s+$//g;
if (/\d+/ && @keys) {
@update{@keys} = split(/\s+/,$_);
} else { @keys = split(/\s+/,$_); }
}
close(PH) or die qq{Unable to close file handle PH for command "$cmd": $!};
my @cpukeys = splice(@keys,-4,4);
my %labels = (wa => "IO wait", id => "Idle", sy => "System", us => "User");
$rrd->create(map { ($_ => "GAUGE") } @cpukeys) unless -f $rrdfile;
$rrd->update(map { ($_ => $update{$_}) } @cpukeys);
This example shows how to set the minimum value to zero on a datasource using the RRDs::tune function. Use -i or --minimum to set the minimum value, and -a or --maximum to set the maximum value.
See http://www.rrdtool.org/rrdtool/doc/rrdtune.en.html.
use strict;
use RRD::Simple;
use RRDs;
my %update = ();
my $cmd = "/usr/bin/iostat -k";
open(PH,"-|",$cmd) or die qq{Unable to open file handle PH for command "$cmd": $!};
while (local $_ = <PH>) {
if (my ($dev,$r,$w) = $_ =~ /^([\w\d]+)\s+\S+\s+\S+\s+\S+\s+(\d+)\s+(\d+)$/) {
$update{$dev} = { "read" => $r, "write" => $w };
}
}
close(PH) or die qq{Unable to close file handle PH for command "$cmd": $!};
for my $dev (keys %update) {
my $rrdfile = "iostat-$dev.rrd";
my $rrd = RRD::Simple->new( file => $rrdfile );
unless (-f $rrdfile) {
$rrd->create(
map { ($_ => "DERIVE") } sort keys %{$update{$dev}}
);
RRDs::tune($rrdfile, "-i", "$_:0") for keys %{$update{$dev}};
}
$rrd->update(%{$update{$dev}});
}
The second (optional) parameter to the create method is the data retention period. Valid values are "day", "week", "month", "year", "3years" and "mrtg". The default value is "mrtg".
The "mrtg" data retention period uses a data stepping resolution of 300 seconds (5 minutes) and heartbeat of 600 seconds (10 minutes), whereas all the other data retention periods use a data stepping resolution of 60 seconds (1 minute) and heartbeat of 120 seconds (2 minutes).
use strict;
use RRD::Simple;
my $rrd = RRD::Simple->new( file => "myfile.rrd" );
my @period = qw(day week month year 3years mrtg);
$rrd->create($period[1],
datasource1 => "GAUGE",
datasource2 => "GAUGE",
datasource3 => "GAUGE",
);
Graph parameters are preserved and should be passed through to RRDs correctly: VDEF, CDEF, DEF, GPRINT, PRINT, COMMENT, HRULE, VRULE, LINE, AREA, TICK, SHIFT and STACK. Use the HRULE parameter to draw a horizontal rule on your graph.
use strict;
use RRD::Simple;
my $rrd = RRD::Simple->new( file => "frequency.rrd" );
$rrd->create("day",
Frequency => "GAUGE",
);
my $end = time();
my $start = $end - (60 * 60 * 24);
my $i = 0;
my $rand = int(rand(100));
for (my $t = $start; $t <= $end; $t += 60) {
$rrd->update($t,
Frequency => ( cos($i += 0.01) * 100 ) + $rand,
);
}
$rrd->graph(
sources => [ qw(Frequency) ],
"HRULE:FrequencyAVERAGE#00ff77:Average" => "",
);
use strict;
use RRD::Simple;
my $rrdfile = "vmstat-cpu.rrd";
my $rrd = RRD::Simple->new( file => $rrdfile );
$rrd->graph(
title => "CPU Utilisation",
vertical_label => "% percent",
upper_limit => 100,
lower_limit => 0,
rigid => "",
sources => [ qw(sy us wa id) ],
source_drawtypes => [ qw(AREA STACK STACK STACK) ],
extended_legend => 1,
);
The color parameter can be used to override the default colours for standard elements of the graph. Valid elements are: BACK, CANVAS, SHADEA, SHADEB, GRID, MGRID, FONT, AXIS, FRAME and ARROW. See http://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html for further information.
use strict;
use RRD::Simple;
my $rrd = RRD::Simple->new( file => "vmstat-cpu.rrd" );
$rrd->graph(
title => "CPU Utilisation",
source_colors => {
sy => "ff0000",
us => "00ff00",
wa => "0000ff",
id => "ffffff",
},
color => [ ( "BACK#F5F5FF", "SHADEA#C8C8FF",
"SHADEB#9696BE", "ARROW#61B51B",
"GRID#404852", "MGRID#67C6DE" ) ],
);
Copyright 2005,2006,2007 Nicola Worthington.
This software is licensed under The Apache Software License, Version 2.0.
