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## <a id="setting-up-check-plugins"></a> Setting up Check Plugins
On its own Icinga 2 does not know how to check external services. The
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[Monitoring Plugins Project](https://www.monitoring-plugins.org/) provides
an extensive set of plugins which can be used with Icinga 2 to check whether
services are working properly.
The recommended way of installing these standard plugins is to use your
distribution's package manager.
> **Note**
>
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> The `Nagios Plugins` project was renamed to `Monitoring Plugins`
> in January 2014. At the time of this writing the packages are still
> using the old name.
For your convenience here is a list of package names for some of the more
popular operating systems/distributions:
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OS/Distribution | Package Name | Installation Path
-----------------------|--------------------|---------------------------
RHEL/CentOS (EPEL) | nagios-plugins-all | /usr/lib/nagios/plugins or /usr/lib64/nagios/plugins
Debian | nagios-plugins | /usr/lib/nagios/plugins
FreeBSD | nagios-plugins | /usr/local/libexec/nagios
OS X (MacPorts) | nagios-plugins | /opt/local/libexec
Depending on which directory your plugins are installed into you may need to
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update the global `PluginDir` constant in your Icinga 2 configuration. This macro is used
by the service templates contained in the Icinga Template Library to determine
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where to find the plugin binaries.
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### <a id="integrate-additional-plugins"></a> Integrate Additional Plugins
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For some services you may need additional check plugins which are not provided
by the official Monitoring Plugins project.
All existing Nagios or Icinga 1.x plugins should work with Icinga 2. Here's a
list of popular community sites which host check plugins:
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* [MonitoringExchange](https://www.monitoringexchange.org)
* [Icinga Wiki](https://wiki.icinga.org)
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The recommended way of setting up these plugins is to copy them to a common directory
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and creating an extra global constant, e.g. `CustomPluginDir` in your `constants.conf`
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configuration file:
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# cp check_snmp_int.pl /opt/plugins
# chmod +x /opt/plugins/check_snmp_int.pl
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# cat /etc/icinga2/constants.conf
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/**
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* This file defines global constants which can be used in
* the other configuration files. At a minimum the
* PluginDir constant should be defined.
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*/
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const PluginDir = "/usr/lib/nagios/plugins"
const CustomPluginDir = "/opt/monitoring"
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Prior to using the check plugin with Icinga 2 you should ensure that it is working properly
by trying to run it on the console using whichever user Icinga 2 is running as:
# su - icinga -s /bin/bash
$ /opt/plugins/check_snmp_int.pl --help
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Additional libraries may be required for some plugins. Please consult the plugin
documentation and/or README for installation instructions.