The ELK-Stack is a good option to aggregate and visualize distributed logging-data. It basically based on

• Elasticsearch as a datastore
• Logstash for extracting and distributing the data
• Kibana as visualization frontend.

The core of the most ELK applications is the Logstash configuration. A user defines here which data (inputs) is processed, how (filter) the data is processed and where it will go afterwards (outputs). Especilly this configuration contains a lot of logic which is unfortunally not easy to test. In this article I want to show you how to setup a testing environment for your Logstash configuration.

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