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1 <module>
2   <name>external</name>
3   <description><para>The external module performs checks via external processes like more traditional monitoring systems.  While this approach is far less efficient and does not scale well on a single system, it provides easier transition from existing monitoring systems.  Checks should exit normally with an exit status of 0 for success, 1 or 2 for failure and 3 for unknown.  Exiting with a status of 3 is highly discouraged.  The standard output is provided as the status of the check.</para></description>
4   <loader>C</loader>
5   <image></image>
6   <moduleconfig>
7     <parameter name="user"
8                required="optional"
9                allowed=".+">The user under which the external checks should be executed.</parameter>
10     <parameter name="group"
11                required="optional"
12                allowed=".+">The group under which the external checks should be executed.</parameter>
13   </moduleconfig>
14   <checkconfig>
15     <parameter name="command"
16                required="required"
17                allowed=".+">The path to the command to be executed.  This is the first argument to the execve system call.</parameter>
18     <parameter name="arg0"
19                required="optional"
20                allowed=".+">The program name.  If not specified, it is derived from the command argument. Normal interpolation rules apply.</parameter>
21     <parameter name="arg\d+"
22                required="optional"
23                allowed=".+">The arguments to the program.  The external module will start with arg1 and increment collecting arguments until argN is not found.  Normal interpolation rules apply.</parameter>
24     <parameter name="env_\S+"
25                required="optional"
26                allowed=".+">These parameters allow the setting of environment variables for the command execution.  The text following env_ is the key and the parameter value is the value of the environment variable to be set via execve.</parameter>
27   </checkconfig>
28   <examples>
29     <example>
30       <title>Checking a service via the /path/to/check_foo command.</title>
31       <para>The hypothetical check_foo command takes a target host with the -H parameter, runs a check and returns its health via exit code and stdout. We set the environment variable QUUX to the value BAZ.  The check is against host</para>
32       <programlisting><![CDATA[
33       <noit>
34         <modules>
35           <module image="external" name="external"/>
36         </modules>
37         <checks>
38           <check uuid="1e8edc38-0d88-11de-93ee-af2195eab5d5"
39                  module="external" name="foo" target="">
40             <config>
41               <command>/path/to/check_foo</command>
42               <arg1>-H</arg1>
43               <arg2>%[target]</arg2>
44               <env_QUUX>BAZ</env_QUUX>
45             </config>
46           </check>
47         </checks>
48       </noit>
49       ]]></programlisting>
50     </example>
51   </examples>
52 </module>
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