1Monitoring::Plugin(3) User Contributed Perl DocumentationMonitoring::Plugin(3)
2
6 Monitoring::Plugin - A family of perl modules to streamline writing
7 Naemon, Nagios, Icinga or Shinken (and compatible) plugins.
8
10 # Constants OK, WARNING, CRITICAL, and UNKNOWN are exported by default
11 # See also Monitoring::Plugin::Functions for a functional interface
12 use Monitoring::Plugin;
13 # Constructor
15 $np = Monitoring::Plugin->new; # OR
16 $np = Monitoring::Plugin->new( shortname => "PAGESIZE" ); # OR
17 # use Monitoring::Plugin::Getopt to process the @ARGV command line options:
20 # --verbose, --help, --usage, --timeout and --host are defined automatically.
21 $np = Monitoring::Plugin->new(
22 usage => "Usage: %s [ -v|--verbose ] [-H <host>] [-t <timeout>] "
23 . "[ -c|--critical=<threshold> ] [ -w|--warning=<threshold> ]",
24 );
25 # add valid command line options and build them into your usage/help documentation.
27 $np->add_arg(
28 spec => 'warning|w=s',
29 help => '-w, --warning=INTEGER:INTEGER . See '
30 . 'https://www.monitoring-plugins.org/doc/guidelines.html#THRESHOLDFORMAT '
31 . 'for the threshold format. ',
32 );
33 # Parse @ARGV and process standard arguments (e.g. usage, help, version)
35 $np->getopts;
36 # Exit/return value methods - plugin_exit( CODE, MESSAGE ),
39 # plugin_die( MESSAGE, [CODE])
40 $page = retrieve_page($page1)
41 or $np->plugin_exit( UNKNOWN, "Could not retrieve page" );
42 # Return code: 3;
43 # output: PAGESIZE UNKNOWN - Could not retrieve page
44 test_page($page)
45 or $np->plugin_exit( CRITICAL, "Bad page found" );
46 # plugin_die() is just like plugin_exit(), but return code defaults
48 # to UNKNOWN
49 $page = retrieve_page($page2)
50 or $np->plugin_die( "Could not retrieve page" );
51 # Return code: 3;
52 # output: PAGESIZE UNKNOWN - Could not retrieve page
53 # Threshold methods
55 $code = $np->check_threshold(
56 check => $value,
57 warning => $warning_threshold,
58 critical => $critical_threshold,
59 );
60 $np->plugin_exit( $code, "Threshold check failed" ) if $code != OK;
61 # Message methods
63 # add_message( CODE, $message ); check_messages()
64 for (@collection) {
65 if (m/Error/) {
66 $np->add_message( CRITICAL, $_ );
67 } else {
68 $np->add_message( OK, $_ );
69 }
70 }
71 ($code, $message) = $np->check_messages();
72 plugin_exit( $code, $message );
73 # If any items in collection matched m/Error/, returns CRITICAL and
74 # the joined set of Error messages; otherwise returns OK and the
75 # joined set of ok messages
76 # Perfdata methods
79 $np->add_perfdata(
80 label => "size",
81 value => $value,
82 uom => "kB",
83 threshold => $threshold,
84 );
85 $np->add_perfdata( label => "time", ... );
86 $np->plugin_exit( OK, "page size at http://... was ${value}kB" );
87 # Return code: 0;
88 # output: PAGESIZE OK - page size at http://... was 36kB \
89 # | size=36kB;10:25;25: time=...
90
92 Monitoring::Plugin and its associated Monitoring::Plugin::* modules are
93 a family of perl modules to streamline writing Monitoring plugins. The
94 main end user modules are Monitoring::Plugin, providing an object-
95 oriented interface to the entire Monitoring::Plugin::* collection, and
96 Monitoring::Plugin::Functions, providing a simpler functional interface
97 to a useful subset of the available functionality.
98 The purpose of the collection is to make it as simple as possible for
100 developers to create plugins that conform the Monitoring Plugin
101 guidelines (https://www.monitoring-plugins.org/doc/guidelines.html).
102 EXPORTS
104 Nagios status code constants are exported by default:
105 OK
107 WARNING
108 CRITICAL
109 UNKNOWN
110 DEPENDENT
111 The following variables are also exported on request:
113 %ERRORS
115 A hash mapping error strings ("CRITICAL", "UNKNOWN", etc.) to the
116 corresponding status code.
117 %STATUS_TEXT
119 A hash mapping status code constants (OK, WARNING, CRITICAL, etc.)
120 to the corresponding error string ("OK", "WARNING, "CRITICAL",
121 etc.) i.e. the reverse of %ERRORS.
122 CONSTRUCTOR
124 Monitoring::Plugin->new;
125 Monitoring::Plugin->new( shortname => 'PAGESIZE' );
127 Monitoring::Plugin->new(
129 usage => "Usage: %s [ -v|--verbose ] [-H <host>] [-t <timeout>]
130 [ -c|--critical=<critical threshold> ] [ -w|--warning=<warning threshold> ] ",
131 version => $VERSION,
132 blurb => $blurb,
133 extra => $extra,
134 url => $url,
135 license => $license,
136 plugin => basename $0,
137 timeout => 15,
138 );
139 Instantiates a new Monitoring::Plugin object. Accepts the following
141 named arguments:
142 shortname
144 The 'shortname' for this plugin, used as the first token in the
145 plugin output by the various exit methods. Default: uc basename $0.
146 usage ("Usage: %s --foo --bar")
148 Passing a value for the usage() argument makes Monitoring::Plugin
149 instantiate its own "Monitoring::Plugin::Getopt" object so you can
150 start doing command line argument processing. See "CONSTRUCTOR" in
151 Monitoring::Plugin::Getopt for more about "usage" and the following
152 options:
153 version
155 url
156 blurb
157 license
158 extra
159 plugin
160 timeout
161 GETTER/SETTER
163 The following internal variables can be retrieved or set by calling a
164 method with the respective name. Expect for "shortname", don't change
165 values unless you know what you're doing.
166 Examples:
168 use Data::Dumper;
170 print Dumper($plugin->perfdata);
171 $plugin->shortname('DifferentName');
172 shortname
174 perfdata
175 messages
176 opts
177 threshold
178 OPTION HANDLING METHODS
180 "Monitoring::Plugin" provides these methods for accessing the
181 functionality in "Monitoring::Plugin::Getopt".
182 add_arg
184 Examples:
185 # Define --hello argument (named parameters)
187 $plugin->add_arg(
188 spec => 'hello=s',
189 help => "--hello\n Hello string",
190 required => 1,
191 );
192 # Define --hello argument (positional parameters)
194 # Parameter order is 'spec', 'help', 'default', 'required?'
195 $plugin->add_arg('hello=s', "--hello\n Hello string", undef, 1);
196 See "ARGUMENTS" in Monitoring::Plugin::Getopt for more details.
198 getopts()
200 Parses and processes the command line options you've defined,
201 automatically doing the right thing with help/usage/version
202 arguments.
203 See "GETOPTS" in Monitoring::Plugin::Getopt for more details.
205 opts()
207 Assuming you've instantiated it by passing 'usage' to new(), opts()
208 returns the Monitoring::Plugin object's
209 "Monitoring::Plugin::Getopt" object, with which you can do lots of
210 great things.
211 E.g.
213 if ( $plugin->opts->verbose ) {
215 print "yah yah YAH YAH YAH!!!";
216 }
217 # start counting down to timeout
219 alarm $plugin->opts->timeout;
220 your_long_check_step_that_might_time_out();
221 # access any of your custom command line options,
223 # assuming you've done these steps above:
224 # $plugin->add_arg('my_argument=s', '--my_argument [STRING]');
225 # $plugin->getopts;
226 print $plugin->opts->my_argument;
227 Again, see Monitoring::Plugin::Getopt.
229 EXIT METHODS
231 plugin_exit( <CODE>, $message )
232 Exit with return code CODE, and a standard nagios message of the
233 form "SHORTNAME CODE - $message".
234 nagios_exit( <CODE>, $message )
236 Alias for plugin_exit(). Deprecated.
237 plugin_die( $message, [<CODE>] )
239 Same as plugin_exit(), except that CODE is optional, defaulting to
240 UNKNOWN. NOTE: exceptions are not raised by default to calling
241 code. Set $_use_die flag if this functionality is required (see
242 test code).
243 nagios_die( $message, [<CODE>] )
245 Alias for plugin_die(). Deprecated.
246 die( $message, [<CODE>] )
248 Alias for plugin_die(). Deprecated.
249 max_state, max_state_alt
251 These are wrapper function for
252 Monitoring::Plugin::Functions::max_state and
253 Monitoring::Plugin::Functions::max_state_alt.
254 THRESHOLD METHODS
256 These provide a top level interface to the
257 "Monitoring::Plugin::Threshold" module; for more details, see
258 Monitoring::Plugin::Threshold and Monitoring::Plugin::Range.
259 check_threshold( $value )
261 check_threshold( check => $value, warning => $warn, critical => $crit )
262 Evaluates $value against the thresholds and returns OK, CRITICAL,
263 or WARNING constant. The thresholds may be:
264 1. explicitly set by passing 'warning' and/or 'critical' parameters
266 to
267 "check_threshold()", or,
268 2. explicitly set by calling "set_thresholds()" before
270 "check_threshold()", or,
271 3. implicitly set by command-line parameters -w, -c, --critical or
273 --warning, if you have run "$plugin->getopts()".
274 You can specify $value as an array of values and each will be
276 checked against the thresholds.
277 The return value is ready to pass to C <plugin_exit>, e . g .,
279 $p->plugin_exit(
281 return_code => $p->check_threshold($result),
282 message => " sample result was $result"
283 );
284 set_thresholds(warning => "10:25", critical => "~:25")
286 Sets the acceptable ranges and creates the plugin's
287 Monitoring::Plugins::Threshold object. See
288 https://www.monitoring-plugins.org/doc/guidelines.html#THRESHOLDFORMAT
289 for details and examples of the threshold format.
290 threshold()
292 Returns the object's "Monitoring::Plugin::Threshold" object, if it
293 has been defined by calling set_thresholds(). You can pass a new
294 Threshold object to it to replace the old one too, but you
295 shouldn't need to do that from a plugin script.
296 MESSAGE METHODS
298 add_messages and check_messages are higher-level convenience methods to
299 add and then check a set of messages, returning an appropriate return
300 code and/or result message. They are equivalent to maintaining a set of
301 @critical, @warning, and and @ok message arrays (add_message), and then
302 doing a final if test (check_messages) like this:
303 if (@critical) {
305 plugin_exit( CRITICAL, join(' ', @critical) );
306 }
307 elsif (@warning) {
308 plugin_exit( WARNING, join(' ', @warning) );
309 }
310 else {
311 plugin_exit( OK, join(' ', @ok) );
312 }
313 add_message( <CODE>, $message )
315 Add a message with CODE status to the object. May be called
316 multiple times. The messages added are checked by check_messages,
317 following.
318 Only CRITICAL, WARNING, and OK are accepted as valid codes.
320 check_messages()
322 Check the current set of messages and return an appropriate nagios
323 return code and/or a result message. In scalar context, returns
324 only a return code; in list context returns both a return code and
325 an output message, suitable for passing directly to plugin_exit()
326 e.g.
327 $code = $np->check_messages;
329 ($code, $message) = $np->check_messages;
330 check_messages returns CRITICAL if any critical messages are found,
332 WARNING if any warning messages are found, and OK otherwise. The
333 message returned in list context defaults to the joined set of
334 error messages; this may be customised using the arguments below.
335 check_messages accepts the following named arguments (none are
337 required):
338 join => SCALAR
340 A string used to join the relevant array to generate the
341 message string returned in list context i.e. if the 'critical'
342 array @crit is non-empty, check_messages would return:
343 join( $join, @crit )
345 as the result message. Default: ' ' (space).
347 join_all => SCALAR
349 By default, only one set of messages are joined and returned in
350 the result message i.e. if the result is CRITICAL, only the
351 'critical' messages are included in the result; if WARNING,
352 only the 'warning' messages are included; if OK, the 'ok'
353 messages are included (if supplied) i.e. the default is to
354 return an 'errors-only' type message.
355 If join_all is supplied, however, it will be used as a string
357 to join the resultant critical, warning, and ok messages
358 together i.e. all messages are joined and returned.
359 critical => ARRAYREF
361 Additional critical messages to supplement any passed in via
362 add_message().
363 warning => ARRAYREF
365 Additional warning messages to supplement any passed in via
366 add_message().
367 ok => ARRAYREF | SCALAR
369 Additional ok messages to supplement any passed in via
370 add_message().
371 PERFORMANCE DATA METHODS
373 add_perfdata( label => "size", value => $value, uom => "kB", threshold
374 => $threshold )
375 Add a set of performance data to the object. May be called multiple
376 times. The performance data is included in the standard plugin
377 output messages by the various exit methods.
378 See the Monitoring::Plugin::Performance documentation for more
380 information on performance data and the various field definitions,
381 as well as the relevant section of the Monitoring Plugin guidelines
382 (https://www.monitoring-plugins.org/doc/guidelines.html#AEN202).
383
385 "Enough talk! Show me some examples!"
386 See the file 'check_stuff.pl' in the 't' directory included with the
388 Monitoring::Plugin distribution for a complete working example of a
389 plugin script.
390
392 The Monitoring::Plugin::* modules are currently experimental and so the
393 interfaces may change up until Monitoring::Plugin hits version 1.0,
394 although every attempt will be made to keep them as backwards
395 compatible as possible.
396
398 See Monitoring::Plugin::Functions for a simple functional interface to
399 a subset of the available Monitoring::Plugin functionality.
400 See also Monitoring::Plugin::Getopt, Monitoring::Plugin::Range,
402 Monitoring::Plugin::Performance, Monitoring::Plugin::Range, and
403 Monitoring::Plugin::Threshold.
404 The Monitoring Plugin project page is at http://monitoring-plugins.org.
406
408 Please report bugs in these modules to the Monitoring Plugin
409 development team: devel@monitoring-plugins.org.
410
412 Maintained by the Monitoring Plugin development team -
413 https://www.monitoring-plugins.org.
414 Originally by Ton Voon, <ton.voon@altinity.com>.
416
418 Copyright (C) 2014 by Monitoring Plugin Team Copyright (C)
419 2006-2014 by Nagios Plugin Development Team
420 This library is free software; you can redistribute it and/or modify it
422 under the same terms as Perl itself, either Perl version 5.8.4 or, at
423 your option, any later version of Perl 5 you may have available.
424perl v5.32.0 2020-07-28 Monitoring::Plugin(3)