# <a id="addons-plugins"></a> Icinga 2 Addons and Plugins

## <a id="addons-graphing"></a> Graphing

### <a id="addons-graphing-pnp"></a> PNP

[PNP](http://www.pnp4nagios.org) is a graphing addon.

[PNP](http://www.pnp4nagios.org) is an addon which adds a graphical representation of the performance data collected
by the monitoring plugins. The data is stored as rrd (round robin database) files.

Use your distribution's package manager to install the `pnp4nagios` package.

If you're planning to use it configure it to use the
[bulk mode with npcd and npcdmod](http://docs.pnp4nagios.org/pnp-0.6/modes#bulk_mode_with_npcd_and_npcdmod)
in combination with Icinga 2's [PerfdataWriter](5-advanced-topics.md#performance-data). NPCD collects the performance
data files which Icinga 2 generates.

Enable performance data writer in icinga 2

    # icinga2 feature enable perfdata

Configure npcd to use the performance data created by Icinga 2:

    vim /etc/pnp4nagios/npcd.cfg

Set `perfdata_spool_dir = /var/spool/icinga2/perfdata` and restart the `npcd` daemon.

There's also an Icinga Web 2 module for direct PNP graph integration
available at https://exchange.icinga.org/icinga/PNP4Nagios

More information on [action_url as attribute](13-addons-plugins.md#addons-graphing-pnp-action-url)
and [graph template names](13-addons-plugins.md#addons-graphing-pnp-custom-templates).


### <a id="addons-graphing-graphite"></a> Graphite

[Graphite](http://graphite.readthedocs.org/en/latest/) is a time-series database
storing collected metrics and making them available through restful apis
and web interfaces.

Graphite consists of 3 software components:

* carbon - a Twisted daemon that listens for time-series data
* whisper - a simple database library for storing time-series data (similar in design to RRD)
* graphite webapp - A Django webapp that renders graphs on-demand using Cairo

Use the [GraphiteWriter](5-advanced-topics.md#graphite-carbon-cache-writer) feature
for sending real-time metrics from Icinga 2 to Graphite.

    # icinga2 feature enable graphite

There are Graphite addons available for collecting the performance data files too (e.g. `Graphios`).

### <a id="addons-graphing-ingraph"></a> inGraph

[inGraph](https://www.netways.org/projects/ingraph/wiki) requires the ingraph-collector addon
to be configured to point at the perfdata files. Icinga 2's [PerfdataWriter](5-advanced-topics.md#performance-data) will
write to the performance data spool directory.

## <a id="addons-visualization"></a> Visualization

### <a id="addons-visualization-reporting"></a> Icinga Reporting

By enabling the DB IDO feature you can use the Icinga Reporting package.

### <a id="addons-visualization-nagvis"></a> NagVis

By using either Livestatus or DB IDO as a backend you can create your own network maps
based on your monitoring configuration and status data using [NagVis](http://www.nagvis.org).

### <a id="addons-visualization-thruk"></a> Thruk

[Thruk](http://www.thruk.org) is an alternative web interface which can be used with Icinga 2.

## <a id="log-monitoring"></a> Log Monitoring

Using Logstash or Graylog in your infrastructure and correlate events with your monitoring
is even simpler these days.

* Use the `GelfWriter` feature to write Icinga 2's check and notification events to Graylog or Logstash.
* Configure the logstash `nagios` output to send passive traps to Icinga 2 using the external command pipe.
* Execute a plugin to check Graylog alert streams.

More details can be found in [this blog post](https://www.icinga.org/2014/12/02/team-icinga-at-osmc-2014/).

## <a id="configuration-tools"></a> Configuration Management Tools

If you require your favourite configuration tool to export Icinga 2 configuration, please get in
touch with their developers. The Icinga project does not provide a configuration web interface
yet. Follow the [Icinga Blog](https://www.icinga.org/blog/) for updates on this topic.

If you're looking for puppet manifests, chef cookbooks, ansible recipes, etc - we're happy
to integrate them upstream, so please get in touch at [https://support.icinga.org](https://support.icinga.org).

These tools are currently in development and require feedback and tests:

* [Ansible Roles](https://github.com/Icinga/icinga2-ansible)
* [Puppet Module](https://github.com/Icinga/puppet-icinga2)
* [Chef Cookbook](https://github.com/Icinga/chef-icinga2)


## <a id="plugins"></a> Plugins

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 work with Icinga 2. Here's a
list of popular community sites which host check plugins:

* [Icinga Exchange](https://exchange.icinga.org)
* [Icinga Wiki](https://wiki.icinga.org)

The recommended way of setting up these plugins is to copy them to a common directory
and create a new global constant, e.g. `CustomPluginDir` in your [constants.conf](4-configuring-icinga-2.md#constants-conf)
configuration file:

    # cp check_snmp_int.pl /opt/monitoring/plugins
    # chmod +x /opt/plugins/check_snmp_int.pl

    # cat /etc/icinga2/constants.conf
    /**
     * This file defines global constants which can be used in
     * the other configuration files. At a minimum the
     * PluginDir constant should be defined.
     */

    const PluginDir = "/usr/lib/nagios/plugins"
    const CustomPluginDir = "/opt/monitoring/plugins"

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/monitoring/plugins/check_snmp_int.pl --help

Additional libraries may be required for some plugins. Please consult the plugin
documentation and/or plugin provided README for installation instructions.
Sometimes plugins contain hard-coded paths to other components. Instead of changing
the plugin it might be easier to create logical links which is (more) update-safe.

Each plugin requires a [CheckCommand](6-object-types.md#objecttype-checkcommand) object in your
configuration which can be used in the [Service](6-object-types.md#objecttype-service) or
[Host](6-object-types.md#objecttype-host) object definition.

There are the following conventions to follow when adding a new command object definition:

* Always import the `plugin-check-command` template
* Use [command-arguments](#) whenever possible. The `command` attribute must be an array
in `[ ... ]` then for shell escaping.
* Define a unique `prefix` for the command's specific command arguments. That way you can safely
set them on host/service level and you'll always know which command they control.
* Use command argument default values, e.g. for thresholds
* Use [advanced conditions](6-object-types.md#objecttype-checkcommand) like `set_if` definitions.

Example for a custom `my-snmp-int` check command:

    object CheckCommand "my-snmp-int" {
      import "plugin-check-command"

      command = [ CustomPluginDir + "/check_snmp_int.pl" ]

      arguments = {
        "-H" = "$snmp_address$"
        "-C" = "$snmp_community$"
        "-p" = "$snmp_port$"
        "-2" = {
          set_if = "$snmp_v2$"
        }
        "-n" = "$snmp_interface$"
        "-f" = {
          set_if = "$snmp_perf$"
        }
        "-w" = "$snmp_warn$"
        "-c" = "$snmp_crit$"
      }

      vars.snmp_v2 = true
      vars.snmp_perf = true
      vars.snmp_warn = "300,400"
      vars.snmp_crit = "0,600"
    }

Icinga 2 has built-in check command definitions for the [Manubulon Plugin Checks](7-icinga-template-library.md#snmp-manubulon-plugin-check-commands).

For further information on your monitoring configuration read the
[Monitoring Basics](3-monitoring-basics.md#monitoring-basics) chapter.

You can find additional plugins at the [Icinga Exchange](https://exchange.icinga.org)

More details on the plugins can also be found on the Icinga Wiki at https://wiki.icinga.org

> **Tip**
>
> Create the best `CheckCommand` definition there is and send it upstream. More
> information can be found in [Contribute Icinga 2 ITL Plugin Check Command Definitions](https://wiki.icinga.org/display/community/Contribute+Icinga+2+ITL+Plugin+Check+Command+Definitions)
> on the Icinga Wiki. Thank you in advance!

## <a id="plugin-api"></a> Plugin API

Currently Icinga 2 supports the native plugin API specification from the `Monitoring Plugins`
project.

The `Monitoring Plugin API` is defined in the [Monitoring Plugins Development Guidelines](https://www.monitoring-plugins.org/doc/guidelines.html).

There are no output length restrictions using Icinga 2. This is different to the
[Icinga 1.x plugin api definition](http://docs.icinga.org/latest/en/pluginapi.html#outputlengthrestrictions).


## <a id="addon-integration-hints"></a> More Addon Integration Hints

### <a id="addons-graphing-pnp-action-url"></a> PNP Action Url

They work in a similar fashion for Icinga 2 and are used for 1.x web interfaces (Icinga Web 2 doesn't require
the action url attribute in its own module).

    template Service "pnp-hst" {
      action_url = "/pnp4nagios/graph?host=$HOSTNAME$"
    }

    template Service "pnp-svc" {
      action_url = "/pnp4nagios/graph?host=$HOSTNAME$&srv=$SERVICEDESC$"
    }

### <a id="addons-graphing-pnp-custom-templates"></a> PNP Custom Templates with Icinga 2

PNP automatically determines the graph template from the check command name (or the argument's name).
This behavior changed in Icinga 2 compared to Icinga 1.x. Though there are certain possibilities to
fix this:

* Create a symlink for example from the `templates.dist/check_ping.php` template to the actual check name in Icinga 2 (`templates/ping4.php`)
* Pass the check command name inside the [format template configuration](5-advanced-topics.md#writing-performance-data-files)

The latter becomes difficult with agent based checks like NRPE or SSH where the first command argument acts as
graph template identifier. There is the possibility to define the pnp template name as custom attribute
and use that inside the formatting templates as `SERVICECHECKCOMMAND` for instance.

Example for services:

    # vim /etc/icinga2/features-enabled/perfdata.conf

    service_format_template = "DATATYPE::SERVICEPERFDATA\tTIMET::$icinga.timet$\tHOSTNAME::$host.name$\tSERVICEDESC::$service.name$\tSERVICEPERFDATA::$service.perfdata$\tSERVICECHECKCOMMAND::$service.check_command$$pnp_check_arg1$\tHOSTSTATE::$host.state$\tHOSTSTATETYPE::$host.state_type$\tSERVICESTATE::$service.state$\tSERVICESTATETYPE::$service.state_type$"

    # vim /etc/icinga2/conf.d/services.conf

    template Service "pnp-svc" {
      action_url = "/pnp4nagios/graph?host=$HOSTNAME$&srv=$SERVICEDESC$"
      vars.pnp_check_arg1 = ""
    }

    apply Service "nrpe-check" {
      import "pnp-svc"
      check_command = nrpe
      vars.nrpe_command = "check_disk"

      vars.pnp_check_arg1 = "!$nrpe_command$"
    }

If there are warnings about unresolved macros make sure to specify a default value for `vars.pnp_check_arg1` inside the

In PNP, the custom template for nrpe is then defined in `/etc/pnp4nagios/custom/nrpe.cfg`
and the additional command arg string will be seen in the xml too for other templates.