Fluentd: Open-Source Log Collector
===================================
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[Fluentd](https://www.fluentd.org/) collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Fluentd helps you unify your logging infrastructure (Learn more about the [Unified Logging Layer](https://www.fluentd.org/blog/unified-logging-layer)).

<p align="center">
<img src="https://www.fluentd.org/images/fluentd-architecture.png" width="500px"/>
</p>

An event consists of *tag*, *time* and *record*. Tag is a string separated with '.' (e.g. myapp.access). It is used to categorize events. Time is a UNIX time recorded at occurrence of an event. Record is a JSON object.

## Example Use Cases

Use Case | Description | Diagram
-------- | ------------|:---------:
Centralizing Apache/Nginx Server Logs | Fluentd can be used to tail access/error logs and transport them reliably to remote systems. | <img src="https://www.fluentd.org/assets/img/recipes/elasticsearch-s3-fluentd.png" height="150"/>
Syslog Alerting | Fluentd can "grep" for events and send out alerts. | <img src="https://www.fluentd.org/images/syslog-fluentd-alert.png" height="100"/>
Mobile/Web Application Logging | Fluentd can function as middleware to enable asynchronous, scalable logging for user action events. | <img src="https://www.fluentd.org/assets/img/datasources/asynchronous_logging.png" height="150"/>

## Quick Start

    $ gem install fluentd
    $ fluentd -s conf
    $ fluentd -c conf/fluent.conf &
    $ echo '{"json":"message"}' | fluent-cat debug.test

## Development

### Branch

- master: For v1 development.
- v0.12: For v0.12. This is deprecated version. we already stopped supporting (See https://www.fluentd.org/blog/drop-schedule-announcement-in-2019).

### Prerequisites

- Ruby 2.4 or later
- git

`git` should be in `PATH`. On Windows, you can use `Github for Windows` and `GitShell` for easy setup.

### Install dependent gems

Use bundler:

    $ gem install bundler
    $ bundle install --path vendor/bundle

### Run test

    $ bundle exec rake test

You can run specified test via `TEST` environment variable:

    $ bundle exec rake test TEST=test/test_specified_path.rb
    $ bundle exec rake test TEST=test/test_*.rb

## Fluentd UI: Admin GUI

[Fluentd UI](https://github.com/fluent/fluentd-ui) is a graphical user interface to start/stop/configure Fluentd.

<p align="center"><img width="500" src="https://www.fluentd.org/images/blog/fluentd-ui.gif"/></p>

## More Information

- Website: https://www.fluentd.org/
- Documentation: https://docs.fluentd.org/
- Project repository: https://github.com/fluent
- Discussion: https://groups.google.com/group/fluentd
- Slack / Community: https://slack.fluentd.org
- Newsletters: https://www.fluentd.org/newsletter
- Author: [Sadayuki Furuhashi](https://github.com/frsyuki)
- Copyright: 2011-2019 Fluentd Authors
- License: Apache License, Version 2.0

## Security

A third party security audit was performed by Cure53, you can see the full report [here](docs/SECURITY_AUDIT.pdf).

## Contributors:

Patches contributed by [great developers](https://github.com/fluent/fluentd/contributors).

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