Custom Fluentd Docker Image

Custom build of fluent/fluentd for article and demo on Docker logging to ELK on AWS.

Used to build a custom Fluentd image with additional Fluentd plugins, including the Elasticsearch fluent-plugin-elasticsearch plugin. Follows instructions provided with the fluent/fluentd image on Docker Hub.

Build New Image

mkdir custom-fluentd
cd custom-fluentd
curl https://raw.githubusercontent.com/fluent/fluentd-docker-image/master/v0.14/alpine-onbuild/fluent.conf > fluent.conf
curl https://raw.githubusercontent.com/fluent/fluentd-docker-image/master/Dockerfile.sample > Dockerfile
mkdir plugins

Modify the Dockerfile and fluent.conf as required.

Fluentd Configuration

fluent.conf

# fluentd config for logging demo

<source>
  @type forward
  port 24224
</source>

<filter **>
  @type concat
  key log
  stream_identity_key container_id
  multiline_start_regexp /^\S+/
  multiline_end_regexp /\s+.*more$/
  flush_interval 120s
  timeout_label @processdata
</filter>

<label @ERROR>
  <match **>
    @type stdout
  </match>
</label>

<label @processdata>
  <match **>
    @type stdout
  </match>
</label>

<match **>
  @type elasticsearch
  logstash_format true
  host elk
  port 9200
  index_name fluentd
  type_name fluentd
</match>