Fast and Lightweight Log processor and forwarder for Linux, BSD and OSX
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edsiper in_tail: fix leak on file name on rotated file (CID 183990)
Signed-off-by: Eduardo Silva <>
Latest commit 2e89ec0 Sep 22, 2018
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.github community: add initial Issue Template for Feature Requests and Bug Re… Jul 5, 2018
bin Initial import. Jan 27, 2015
build Build: add missing build/ directory Jan 29, 2015
cmake build: cmake: new FindMonkey helper Oct 3, 2017
conf parsers: conf: adds CRIO parser support (#667) Jul 9, 2018
cpack build: CMake: update package info Mar 14, 2017
debian debian: bump to v0.15.0 Aug 30, 2018
documentation Doc: fix URL Jun 2, 2016
examples out_lib: release buffer at user size May 24, 2017
include build: bin: if FLB_STATIC_CONF depends on flb-static-conf target Sep 20, 2018
init init: forward-port systemd init script Nov 2, 2016
lib lib: monkey: sync changes (details below) Sep 13, 2018
plugins in_tail: fix leak on file name on rotated file (CID 183990) Sep 22, 2018
scripts scripts: test.lua: output table contents (#627) Jun 14, 2018
src pack: fix outbound memory access when calling msgpack2json (#774) Sep 21, 2018
tests tests: runtime: kubernetes data: adjust record timestamp for apache-l… Sep 22, 2018
tools/xxd-c tools: xxd-c: new helper tool to convert files to C static array defs Sep 20, 2018
.gitignore build: add build directory and generated headers to .gitignore (#780) Sep 20, 2018
.travis.yml ci: enable internal tests after build Jul 10, 2017
CMakeLists.txt build: cmake: disable out_gelf if zlib is not installed (#788) Sep 21, 2018 doc: contributing: fix typo s/like/line/ (#578) May 18, 2018
Dockerfile dockerfile: bump to v0.15.0 Aug 30, 2018 doc: GOLANG: text improvements (#712) Aug 16, 2018
LICENSE Doc: add reference to Apache License v2.0 Jan 28, 2015 Doc: add file May 2, 2017 filter_nest: new filter to handle nest k/v (#531) May 17, 2018
appveyor.yml CI: Appveyor: disable examples Jan 18, 2017 Debian: add packager script Sep 21, 2015 OpenEmbedded/Yocto: make fluent-bit recipe use GIT repository for now May 21, 2015
fluentbit_logo.png Doc: Add logo to README Aug 17, 2016
valgrind.supp core: add valgrind suppression error files (dl-open leaks) Sep 22, 2016

Fluent Bit is a Data Forwarder for Linux, Embedded Linux, OSX and BSD family operating systems. It's part of the Fluentd Ecosystem. Fluent Bit allows collection of information from different sources, buffering and dispatching them to different outputs such as Fluentd, Elasticsearch, Nats or any HTTP end-point within others. It's fully supported on x86_64, x86 and ARM architectures.

For more details about it capabilities and general features please visit the official documentation:

Quick Start

$ cd build
$ cmake ..
$ make
$ bin/fluent-bit -i cpu -o stdout


Fluent Bit support the following features through plugins:

Input plugins

name option description
CPU cpu gather CPU usage between snapshots of one second. It support multiple cores
Disk disk usage of block device
Dummy dummy generates dummy event
Exec exec executes external program and collects event logs
Forward forward Fluentd forward protocol
Memory mem usage of system memory
MQTT mqtt start a MQTT server and receive publish messages
Netif netif usage of network interface
Kernel Ring Buffer kmsg read Linux Kernel messages, same behavior as the dmesg command line program
Syslog syslog read messages from a syslog daemon
Systemd/Journald systemd read messages from journald, part of the systemd suite
Serial Port serial read from serial port
Standard Input stdin read from the standard input
Head head read first part of files
Health health check health of TCP services
Process proc check health of Process
Random random generate random numbers
Tail tail tail log files
TCP tcp listen for raw JSON map messages over TCP

Filter Plugins

name option description
Record Modifier record_modifier Append/Remove key-value pair
Grep grep Match or exclude specific records by patterns
Nest nest Nest specific records by patterns
Kubernetes kubernetes Enrich logs with Kubernetes Metadata
Stdout stdout Print records to the standard output interface
Parser parser Parse records

Output Plugins

name option description
Counter counter count records
Elasticsearch es flush records to a Elasticsearch server
File file flush records to a file
FlowCounter flowcounter count records and its size
Forward forward flush records to a Fluentd service. On the Fluentd side, it requires an in_forward.
NATS nats flush records to a NATS server
HTTP http flush records to a HTTP end point
InfluxDB influxdb flush records to InfluxDB time series database
Plot plot generate a file for gnuplot
Standard Output stdout prints the records to the standard output stream
Treasure Data td flush records to Treasure Data service (cloud analytics)

Official Documentation

The official documentation of Fluent Bit can be found in the following site:


In order to contribute to the project please refer to the CONTRIBUTING guidelines.


Feel free to join us on our Slack channel, Mailing List or IRC:


This program is under the terms of the Apache License v2.0.


Fluent Bit is made and sponsored by Treasure Data among other contributors.