fluentd gelf (graylog) forwarder
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plugins add gelf plugin Sep 27, 2015
.gitignore data persistence doc Feb 14, 2016
Dockerfile made compatible with latest fluentd image Feb 17, 2016
README.md Update README.md Feb 14, 2016
docker-compose.yml data persistence doc Feb 14, 2016
fluent.conf - update readme Sep 27, 2015


fluentd to graylog2 (gelf) forwarder

This will setup a multi container environment containing graylog2 and a fluentd GELF forwarder. It uses the official graylog2 and fluentd containers as base images. The distributed fluentd gelf plugin (plugins/out_gelf.rb) was developed by @emsearcy: https://github.com/emsearcy/fluent-plugin-gelf. It must be present to build the fluentd image successfully.

Using with docker-compose (recommended)

First, this will pull and execute graylog2 all-in-one container env. Then it will build and run a fluentd UPD forwarder to the graylog2 container

docker-compose up -d

Data persistence

By default running graylog with docker-compose up -d will persist data relatively in ./graylog2/data as configured in the docker-compose.yml file. You can simply modify that by placing a docker-compose.override.yml file with your specific configuration in the same directory.

    GRAYLOG_NODE_ID: dev.local
    - {yourAbsoluteOrRelativPath}:/var/opt/greylog/data
    - {yourAbsoluteOrRelativPath}:/var/log/graylog

Make sure that you use docker-compose version 1.5.0 for overriding the docker-compose.yml configuration.

Manual setup steps

Setup graylog2 container

Run graylog2 all-in-one container env.

docker pull graylog2/allinone

docker run -t -p 9000:9000 -p 12201:12201 --name graylog2 -e GRAYLOG_NODE_ID=graylog2 graylog2/allinone

Now, you should be able to login to the graylog2 web interface http://host:9000/ (admin:admin)

Data persistence

To persist graylog2 data outside of your container you need to mount the data volumne.

docker run -t -p 9000:9000 -p 12201:12201 --name graylog2 -e GRAYLOG_NODE_ID=graylog2 -v {yourAbsolutePath}:/var/opt/graylog/data -v {yourAbsolutePath}:/var/log/graylog graylog2/allinone

Setup fluentd to graylog container

Build and link it to graylog2

docker build -t fluent-gelf .

docker run -p 24224:24224 --link graylog2:graylog2 -it --name fluent-gelf fluent-gelf

How to use

Now you're able to push any fluentd logs to HOST:24224. The fluentd messages will be forwarded to graylog2 as long as a tag in format gelf.app.XYZ is specified in the fluentd messages. Make sure, that you define a GELF UPD input source listening to port: 12201 (default) withing graylog2: http://host:9000/system/inputs