1RRD::Simple::Examples(3U)ser Contributed Perl DocumentatiRoRnD::Simple::Examples(3)
2
6 RRD::Simple::Examples - Examples using RRD::Simple
7
9 Example 1: Basic Data Gathering Using vmstat
10 use strict;
11 use RRD::Simple;
12 my $cmd = "/usr/bin/vmstat 2 3";
14 my $rrdfile = "vmstat-cpu.rrd";
15 my $rrd = RRD::Simple->new( file => $rrdfile );
16 my @keys = ();
18 my %update = ();
19 open(PH,"-|",$cmd) or die qq{Unable to open file handle PH for command "$cmd": $!};
20 while (local $_ = <PH>) {
21 next if /---/;
22 s/^\s+|\s+$//g;
23 if (/\d+/ && @keys) {
24 @update{@keys} = split(/\s+/,$_);
25 } else { @keys = split(/\s+/,$_); }
26 }
27 close(PH) or die qq{Unable to close file handle PH for command "$cmd": $!};
28 my @cpukeys = splice(@keys,-4,4);
30 my %labels = (wa => "IO wait", id => "Idle", sy => "System", us => "User");
31 $rrd->create(map { ($_ => "GAUGE") } @cpukeys) unless -f $rrdfile;
33 $rrd->update(map { ($_ => $update{$_}) } @cpukeys);
34 Example 2: Setting Minimum and Maximum Value Limits
36 This example shows how to set the minimum value to zero on a datasource
37 using the RRDs::tune function. Use "-i" or "--minimum" to set the
38 minimum value, and "-a" or "--maximum" to set the maximum value.
39 See <http://www.rrdtool.org/rrdtool/doc/rrdtune.en.html>.
41 use strict;
43 use RRD::Simple;
44 use RRDs;
45 my %update = ();
47 my $cmd = "/usr/bin/iostat -k";
48 open(PH,"-|",$cmd) or die qq{Unable to open file handle PH for command "$cmd": $!};
50 while (local $_ = <PH>) {
51 if (my ($dev,$r,$w) = $_ =~ /^([\w\d]+)\s+\S+\s+\S+\s+\S+\s+(\d+)\s+(\d+)$/) {
52 $update{$dev} = { "read" => $r, "write" => $w };
53 }
54 }
55 close(PH) or die qq{Unable to close file handle PH for command "$cmd": $!};
56 for my $dev (keys %update) {
58 my $rrdfile = "iostat-$dev.rrd";
59 my $rrd = RRD::Simple->new( file => $rrdfile );
60 unless (-f $rrdfile) {
62 $rrd->create(
63 map { ($_ => "DERIVE") } sort keys %{$update{$dev}}
64 );
65 RRDs::tune($rrdfile, "-i", "$_:0") for keys %{$update{$dev}};
66 }
67 $rrd->update(%{$update{$dev}});
69 }
70 Example 3: Creating RRDs with Different Data Retention Periods
72 The second (optional) parameter to the create method is the data
73 retention period. Valid values are "day", "week", "month", "year",
74 "3years" and "mrtg". The default value is "mrtg".
75 The "mrtg" data retention period uses a data stepping resolution of 300
77 seconds (5 minutes) and heartbeat of 600 seconds (10 minutes), whereas
78 all the other data retention periods use a data stepping resolution of
79 60 seconds (1 minute) and heartbeat of 120 seconds (2 minutes).
80 use strict;
82 use RRD::Simple;
83 my $rrd = RRD::Simple->new( file => "myfile.rrd" );
85 my @period = qw(day week month year 3years mrtg);
86 $rrd->create($period[1],
87 datasource1 => "GAUGE",
88 datasource2 => "GAUGE",
89 datasource3 => "GAUGE",
90 );
91 Example 4: Drawing an Average Value Horizonal Rule on a Graph
93 Graph parameters are preserved and should be passed through to RRDs
94 correctly: VDEF, CDEF, DEF, GPRINT, PRINT, COMMENT, HRULE, VRULE, LINE,
95 AREA, TICK, SHIFT and STACK. Use the VDEF and HRULE parameters to draw
96 a horizontal rule on your graph.
97 use strict;
99 use RRD::Simple;
100 my $rrd = RRD::Simple->new( file => "frequency.rrd" );
102 $rrd->create("day",
103 Frequency => "GAUGE",
104 );
105 my $end = time();
107 my $start = $end - (60 * 60 * 24);
108 my $i = 0;
109 my $rand = int(rand(100));
110 for (my $t = $start; $t <= $end; $t += 60) {
112 $rrd->update($t,
113 Frequency => ( cos($i += 0.01) * 100 ) + $rand,
114 );
115 }
116 $rrd->graph(
118 sources => [ qw(Frequency) ],
119 "VDEF:FrequencyAVERAGE=Frequency,AVERAGE" => "",
120 "HRULE:FrequencyAVERAGE#00ff77:Average" => "",
121 );
122 Example 5: Drawing a Fixed Height Stacked Graph
124 use strict;
125 use RRD::Simple;
126 my $rrdfile = "vmstat-cpu.rrd";
128 my $rrd = RRD::Simple->new( file => $rrdfile );
129 $rrd->graph(
131 title => "CPU Utilisation",
132 vertical_label => "% percent",
133 upper_limit => 100,
134 lower_limit => 0,
135 rigid => "",
136 sources => [ qw(sy us wa id) ],
137 source_drawtypes => [ qw(AREA STACK STACK STACK) ],
138 extended_legend => 1,
139 );
140 Example 6: Setting Custom Graph Colours
142 The "color" parameter can be used to override the default colours for
143 standard elements of the graph. Valid elements are: BACK, CANVAS,
144 SHADEA, SHADEB, GRID, MGRID, FONT, AXIS, FRAME and ARROW. See
145 <http://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html> for further
146 information.
147 use strict;
149 use RRD::Simple;
150 my $rrd = RRD::Simple->new( file => "vmstat-cpu.rrd" );
152 $rrd->graph(
154 title => "CPU Utilisation",
155 source_colors => {
156 sy => "ff0000",
157 us => "00ff00",
158 wa => "0000ff",
159 id => "ffffff",
160 },
161 color => [ ( "BACK#F5F5FF", "SHADEA#C8C8FF",
162 "SHADEB#9696BE", "ARROW#61B51B",
163 "GRID#404852", "MGRID#67C6DE" ) ],
164 );
165 Example 7: Capacity Planning Predictions
167 use strict;
168 use RRD::Simple 1.44;
169 my $rrd = RRD::Simple->new( file => "memory_usage.rrd" );
171 $rrd->graph(
173 periods => [ qw(week month) ],
174 title => "Memory Utilisation",
175 base => 1024,
176 vertical_label => "bytes",
177 sources => [ qw(Total Used) ],
178 source_drawtypes => [ qw(AREA LINE) ],
179 source_colors => [ qw(dddddd 0000dd) ],
180 lower_limit => 0,
181 rigid => "",
182 "VDEF:D=Used,LSLSLOPE" => "",
183 "VDEF:H=Used,LSLINT" => "",
184 "VDEF:F=Used,LSLCORREL" => "",
185 "CDEF:Proj=Used,POP,D,COUNT,*,H,+" => "",
186 "LINE2:Proj#800000: Projection" => "",
187 );
188
190 Copyright 2005,2006,2007,2008 Nicola Worthington.
191 This software is licensed under The Apache Software License, Version
193 2.0.
194 <http://www.apache.org/licenses/LICENSE-2.0>
196perl v5.36.0 2022-07-22 RRD::Simple::Examples(3)