fluent/fluentd

Fluentd: Unified Logging Layer (project under CNCF)

13,584

stars

7,038

commits

Ruby

primary language

Sep 10, 2026

updated

www.fluentd.org
cncf
data-collector
fluentd
logging
ruby

README

Fluentd: Open-Source Log Collector

Test Test with Ruby head CII Best Practices OpenSSF Scorecard Backport Pull Requests

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

Development

Branch

Prerequisites

  • Ruby 3.3 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

Security

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

See SECURITY to contact us about vulnerability.

Contributors:

Patches contributed by great developers.

Contributors

(top 30 of 248)

repeatedly

1,763 commits

tagomoris

1,211 commits

ganmacs

726 commits

ashie

571 commits

fluent/fluentd

Fluentd: Unified Logging Layer (project under CNCF)

13,584

stars

7,038

commits

Ruby

primary language

Sep 10, 2026

updated

www.fluentd.org
cncf
data-collector
fluentd
logging
ruby

README

Fluentd: Open-Source Log Collector

Test Test with Ruby head CII Best Practices OpenSSF Scorecard Backport Pull Requests

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

Development

Branch

Prerequisites

  • Ruby 3.3 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

Security

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

See SECURITY to contact us about vulnerability.

Contributors:

Patches contributed by great developers.

Contributors

(top 30 of 248)

repeatedly

1,763 commits

tagomoris

1,211 commits

ganmacs

726 commits

ashie

571 commits

Languages

Ruby

99.7%