Docker GELF Logging Example

This is a really simple application that outputs random fake names using the console different methods: warn,error and log.

The output is then redirected to an ELK instance, where we can filter it by log level.

How to run it?

Install docker and docker-compose, configure the IP for your Logstash instance, then run

docker-compose up

Any ways to run an ELK instance using Docker?

Sure! I recommend you to use:

https://github.com/deviantony/docker-elk

The config I'm using for Logstash is the following:

input {
        gelf {
                type => docker
                port => 5000
        }
}

output {
        elasticsearch {
                hosts => "elasticsearch:9200"
        }
}

Related blog post: http://francolaiuppa.com/2016/05/15/routing-docker-container-logs-to-elk-using-compose/