Fluentd: Open-Source Log Collector

Testing on Ubuntu Testing on Windows Testing on macOS Testing on Arm64 Code Climate CII Best Practices

Fluentd 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).

Quick Start

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




  • 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

More Information


A third party security audit was performed by Cure53, you can see the full report here.

See SECURITY to contact us about vulnerability.


Patches contributed by great developers.


Fluentd: Unified Logging Layer (project under CNCF)

Fluentd Info

⭐ Stars 10920
🔗 Homepage www.fluentd.org
🔗 Source Code github.com
🕒 Last Update 8 months ago
🕒 Created 11 years ago
🐞 Open Issues 116
➗ Star-Issue Ratio 94
😎 Author fluent