This article describes how to install Fluentd (td-agent) on Heroku.

With non-Treasure Data backend

Heroku doesn't allow users to install separate processes within a single dyno. You will thus need to setup Fluentd as a separate Heroku application. This will become you central log aggregation server.

Treasure Data provides a boilerplate repository to get you started. Follow the steps below to create Fluentd (td-agent) as a Heroku application.

# Clone
$ git clone git://github.com/treasure-data/heroku-td-agent.git
$ cd heroku-td-agent
$ rm -fR .git
$ git init
$ git add .
$ git commit -m 'initial commit'
​
# Create the app & deploy
$ heroku create --stack cedar
$ git push heroku master
​
# Update your config
$ vi td-agent.conf
$ git commit -a -m 'update config file'
​
# Deploy
$ git push heroku master

With Treasure Data as a Backend

Since Treasure Data, the primary sponsor of Fluentd, is a Heroku Addons provider, some of you came here to stream data to Treasure Data through Fluentd.

If

          http                          
Your App ------> Heroku-hosted Fluentd ------> Treasure Data

is what you want, there are two ways to deploy it.

1. Heroku Button

Clicking on the following button automatically launched td-agent on Heroku:

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You can read more about this approach here.

2. Using Git

This is similar to "With non-Treasure Data Backend", except you do not need to edit the config. Instead, simply update the configuration variable:

# Clone
$ git clone git://github.com/treasure-data/heroku-td-agent.git
$ cd heroku-td-agent
$ rm -fR .git
$ git init
$ git add .
$ git commit -m 'initial commit'
​
# Create the app & deploy
$ heroku create --stack cedar
$ git push heroku master
​
# Set your config
$ heroku config:set TREASURE_DATA_API_KEY=you_treasure_data_api_key_value
​
# Deploy
$ git push heroku master

To retrieve your treasure_data_api_key_value, see here.

Test

Let's confirm that the log aggregation server has been set up correctly. Please send a GET request to the log server, http://td-agent-on-heroku.herokuapp.com, as shown below. This will log the event { "json": "message" } with a debug.sample tag. Note how the JSON-formatted data is passed as a query parameter value.

$ curl "http://td-agent-on-heroku.herokuapp.com/debug.sample?json=%7B%22json%22%3A%22message%22%7D"

In general, the URL format is

http://{YOUR LOG SERVER DOMAIN}/td.{DB_NAME}.{TABLE_NAME}?json={JSON_FORMATTED_DATA}

The output will be available on STDOUT.

$ heroku logs --tail

If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.