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Logging to Logstash

Logstash is often used for log centralization and analysis. This cookbook describes how to set up Zotonic for logging to Logstash over UDP. As mentioned in the :ref:`Logging chapter <dev-logging>`, Zotonic uses the Lager framework. So we will change Zotonic’s Logstash configuration in order to send messages to Logstash.

Step 1: install a Logstash handler

First, you need to install a Logstash handler for Lager, for instance this one. To do so, add it (and the jsx JSON library) as a :ref:`dependency <deps>` in the rebar.config of your Zotonic site or module:

And recompile Zotonic to install the dependencies.

Step 2: configure the Logstash handler

The next step is to tell the Logstash handler where it should send its messages to:

Step 3: Logstash configuration

You need to configure your Logstash server so it can receive messages from Zotonic. A simple configuration should suffice:

You should now find all Zotonic log messages in Logstash. To test this, just call:

lager:error("Just testing the Logstash setup here!").
.. seealso:: the :ref:`dev-logging` chapter in the Developer Guide.