Icinga 2 supports three different types of logging:
* File logging
-* Syslog (on *NIX-based operating systems)
+* Syslog (on Linux/UNIX)
* Console logging (`STDOUT` on tty)
You can enable additional loggers using the `icinga2 feature enable`
The IDO (Icinga Data Output) modules for Icinga 2 take care of exporting all
configuration and status information into a database. The IDO database is used
-by a number of projects including Icinga Web 1.x and 2.
+by Icinga Web 2.
Details on the installation can be found in the [Configuring DB IDO](2-getting-started.md#configuring-db-ido-mysql)
chapter. Details on the configuration can be found in the
A list of currently supported external commands can be found [here](23-appendix.md#external-commands-list-detail).
Detailed information on the commands and their required parameters can be found
-on the [Icinga 1.x documentation](http://docs.icinga.com/latest/en/extcommands2.html).
+on the [Icinga 1.x documentation](https://docs.icinga.com/latest/en/extcommands2.html).
## <a id="performance-data"></a> Performance Data
More configuration details can be found [here](9-object-types.md#objecttype-influxdbwriter).
-### <a id="gelfwriter"></a> GELF Writer
+### <a id="graylog-integration"></a> Graylog Integration
-The `Graylog Extended Log Format` (short: [GELF](http://www.graylog2.org/resources/gelf))
+#### <a id="gelfwriter"></a> GELF Writer
+
+The `Graylog Extended Log Format` (short: [GELF](http://docs.graylog.org/en/latest/pages/gelf.html))
can be used to send application logs directly to a TCP socket.
-While it has been specified by the [graylog2](http://www.graylog2.org/) project as their
-[input resource standard](http://www.graylog2.org/resources/gelf), other tools such as
-[Logstash](http://www.logstash.net) also support `GELF` as
-[input type](http://logstash.net/docs/latest/inputs/gelf).
+While it has been specified by the [Graylog](https://www.graylog.org) project as their
+[input resource standard](http://docs.graylog.org/en/latest/pages/sending_data.html), other tools such as
+[Logstash](https://www.elastic.co/products/logstash) also support `GELF` as
+[input type](https://www.elastic.co/guide/en/logstash/current/plugins-inputs-gelf.html).
You can enable the feature using
* State changes
* Notifications
-### <a id="logstash-writer"></a> Logstash Writer
+### <a id="elastic-stack-integration"></a> Elastic Stack Integration
+
+[Icingabeat](https://github.com/icinga/icingabeat) is an Elastic Beat that fetches data
+from the Icinga 2 API and sends it either directly to Elasticsearch or Logstash.
+
+More integrations in development:
+* [Logstash output](https://github.com/Icinga/logstash-output-icinga) for the Icinga 2 API.
+* [Logstash Grok Pattern](https://github.com/Icinga/logstash-grok-pattern) for Icinga 2 logs.
+
+#### <a id="logstash-writer"></a> Logstash Writer
[Logstash](https://www.elastic.co/products/logstash) receives
and processes event messages sent by Icinga 2 and the [LogstashWriter](9-object-types.md#objecttype-logstashwriter)
## <a id="setting-up-livestatus"></a> Livestatus
-The [MK Livestatus](http://mathias-kettner.de/checkmk_livestatus.html) project
+The [MK Livestatus](https://mathias-kettner.de/checkmk_livestatus.html) project
implements a query protocol that lets users query their Icinga instance for
status information. It can also be used to send commands.