Fluent Bit: Official Manual
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4.0
4.0
  • Fluent Bit v4.0 Documentation
  • About
    • What is Fluent Bit?
    • A Brief History of Fluent Bit
    • Fluentd and Fluent Bit
    • License
    • Sandbox and Lab Resources
  • Concepts
    • Key Concepts
    • Buffering
    • Data Pipeline
      • Input
      • Parser
      • Filter
      • Buffer
      • Router
      • Output
  • Installation
    • Getting Started with Fluent Bit
    • Upgrade Notes
    • Supported Platforms
    • Requirements
    • Sources
      • Download Source Code
      • Build and Install
      • Build with Static Configuration
    • Linux Packages
      • Amazon Linux
      • Redhat / CentOS
      • Debian
      • Ubuntu
      • Raspbian / Raspberry Pi
    • Docker
    • Containers on AWS
    • Amazon EC2
    • Kubernetes
    • macOS
    • Windows
    • Yocto / Embedded Linux
    • Buildroot / Embedded Linux
  • Administration
    • Configuring Fluent Bit
      • YAML Configuration
        • Service
        • Parsers
        • Multiline Parsers
        • Pipeline
        • Plugins
        • Upstream Servers
        • Environment Variables
        • Includes
      • Classic mode
        • Format and Schema
        • Configuration File
        • Variables
        • Commands
        • Upstream Servers
        • Record Accessor
      • Unit Sizes
      • Multiline Parsing
    • Transport Security
    • Buffering and Storage
    • Backpressure
    • Scheduling and Retries
    • Networking
    • Memory Management
    • Monitoring
    • Multithreading
    • HTTP Proxy
    • Hot Reload
    • Troubleshooting
    • Performance Tips
    • AWS credentials
  • Local Testing
    • Validating your Data and Structure
    • Running a Logging Pipeline Locally
  • Data Pipeline
    • Pipeline Monitoring
    • Inputs
      • Collectd
      • CPU Log Based Metrics
      • Disk I/O Log Based Metrics
      • Docker Events
      • Docker Log Based Metrics
      • Dummy
      • Elasticsearch
      • Exec
      • Exec Wasi
      • Ebpf
      • Fluent Bit Metrics
      • Forward
      • Head
      • Health
      • HTTP
      • Kafka
      • Kernel Logs
      • Kubernetes Events
      • Memory Metrics
      • MQTT
      • Network I/O Log Based Metrics
      • NGINX Exporter Metrics
      • Node Exporter Metrics
      • OpenTelemetry
      • Podman Metrics
      • Process Exporter Metrics
      • Process Log Based Metrics
      • Prometheus Remote Write
      • Prometheus Scrape Metrics
      • Random
      • Serial Interface
      • Splunk
      • Standard Input
      • StatsD
      • Syslog
      • Systemd
      • Tail
      • TCP
      • Thermal
      • UDP
      • Windows Event Log
      • Windows Event Log (winevtlog)
      • Windows Exporter Metrics
    • Parsers
      • Configuring Parser
      • JSON
      • Regular Expression
      • LTSV
      • Logfmt
      • Decoders
    • Processors
      • Content Modifier
      • Labels
      • Metrics Selector
      • OpenTelemetry Envelope
      • Sampling
      • SQL
      • Filters as processors
      • Conditional processing
    • Filters
      • AWS Metadata
      • CheckList
      • ECS Metadata
      • Expect
      • GeoIP2 Filter
      • Grep
      • Kubernetes
      • Log to Metrics
      • Lua
      • Parser
      • Record Modifier
      • Modify
      • Multiline
      • Nest
      • Nightfall
      • Rewrite Tag
      • Standard Output
      • Sysinfo
      • Throttle
      • Type Converter
      • Tensorflow
      • Wasm
    • Outputs
      • Amazon CloudWatch
      • Amazon Kinesis Data Firehose
      • Amazon Kinesis Data Streams
      • Amazon S3
      • Azure Blob
      • Azure Data Explorer
      • Azure Log Analytics
      • Azure Logs Ingestion API
      • Counter
      • Dash0
      • Datadog
      • Dynatrace
      • Elasticsearch
      • File
      • FlowCounter
      • Forward
      • GELF
      • Google Chronicle
      • Google Cloud BigQuery
      • HTTP
      • InfluxDB
      • Kafka
      • Kafka REST Proxy
      • LogDNA
      • Loki
      • Microsoft Fabric
      • NATS
      • New Relic
      • NULL
      • Observe
      • OpenObserve
      • OpenSearch
      • OpenTelemetry
      • Oracle Log Analytics
      • PostgreSQL
      • Prometheus Exporter
      • Prometheus Remote Write
      • SkyWalking
      • Slack
      • Splunk
      • Stackdriver
      • Standard Output
      • Syslog
      • TCP and TLS
      • Treasure Data
      • Vivo Exporter
      • WebSocket
  • Stream Processing
    • Introduction to Stream Processing
    • Overview
    • Changelog
    • Getting Started
      • Fluent Bit + SQL
      • Check Keys and NULL values
      • Hands On 101
  • Fluent Bit for Developers
    • C Library API
    • Ingest Records Manually
    • Golang Output Plugins
    • WASM Filter Plugins
    • WASM Input Plugins
    • Developer guide for beginners on contributing to Fluent Bit
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On this page
  • Single line install
  • CentOS 8
  • Configure Yum
  • Updated key from March 2022
  • Install
  • FAQ
  • Yum install fails with a "404 - Page not found" error for the package mirror

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  1. Installation
  2. Linux Packages

Redhat / CentOS

Last updated 1 month ago

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Fluent Bit is distributed as the fluent-bit package and is available for the latest stable CentOS system.

Fluent Bit supports the following architectures:

  • x86_64

  • aarch64

  • arm64v8

For CentOS 9 and later, Fluent Bit uses as the canonical base system.

Single line install

Fluent Bit provides an installation script to use for most Linux targets. This will always install the most recently released version.

curl https://raw.githubusercontent.com/fluent/fluent-bit/master/install.sh | sh

This is a convenience helper and should always be validated prior to use. The recommended secure deployment approach is to use the following instructions:

CentOS 8

CentOS 8 is now end-of-life, so the default Yum repositories are unavailable.

Ensure you've configured an appropriate mirror. For example:

sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* && \
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

An alternative is to use Rocky or Alma Linux, which should be equivalent.

Configure Yum

The fluent-bit is provided through a Yum repository. To add the repository reference to your system:

  1. In /etc/yum.repos.d/, add a new file called fluent-bit.repo.

  2. Add the following content to the file:

    [fluent-bit]
    name = Fluent Bit
    baseurl = https://packages.fluentbit.io/centos/$releasever/
    gpgcheck=1
    gpgkey=https://packages.fluentbit.io/fluentbit.key
    repo_gpgcheck=1
    enabled=1
  3. As a best practice, enable gpgcheck and repo_gpgcheck for security reasons. Fluent Bit signs its repository metadata and all Fluent Bit packages.

Updated key from March 2022

The GPG Key fingerprint of the new key is:

C3C0 A285 34B9 293E AF51  FABD 9F9D DC08 3888 C1CD
Fluentbit releases (Releases signing key) <releases@fluentbit.io>

The GPG Key fingerprint of the old key is:

F209 D876 2A60 CD49 E680 633B 4FF8 368B 6EA0 722A

Install

  1. After your repository is configured, run the following command to install it:

    sudo yum install fluent-bit
  2. Instruct Systemd to enable the service:

    sudo systemctl start fluent-bit

If you do a status check, you should see a similar output like this:

$ systemctl status fluent-bit
● fluent-bit.service - Fluent Bit
   Loaded: loaded (/usr/lib/systemd/system/fluent-bit.service; disabled; vendor preset: disabled)
   Active: active (running) since Thu 2016-07-07 02:08:01 BST; 9s ago
 Main PID: 3820 (fluent-bit)
   CGroup: /system.slice/fluent-bit.service
           └─3820 /opt/fluent-bit/bin/fluent-bit -c etc/fluent-bit/fluent-bit.conf
...

The default Fluent Bit configuration collect metrics of CPU usage and sends the records to the standard output. You can see the outgoing data in your/var/log/messages file.

FAQ

Yum install fails with a "404 - Page not found" error for the package mirror

The fluent-bit.repo file for the latest installations of Fluent Bit uses a$releasever variable to determine the correct version of the package to install to your system:

[fluent-bit]
name = Fluent Bit
baseurl = https://packages.fluentbit.io/centos/$releasever/$basearch/
...

Depending on your Red Hat distribution version, this variable can return a value other than the OS major release version (for example, RHEL7 Server distributions return7Server instead of 7). The Fluent Bit package URL uses the major OS release version, so any other value here will cause a 404.

To resolve this issue, replace the $releasever variable with your system's OS major release version. For example:

[fluent-bit]
name = Fluent Bit
baseurl = https://packages.fluentbit.io/centos/7/$basearch/
gpgcheck=1
gpgkey=https://packages.fluentbit.io/fluentbit.key
repo_gpgcheck=1
enabled=1

For the 1.9.0 and 1.8.15 and later releases, the. Ensure this new one is added.

The previous key is and might be required to install previous versions.

Refer to the to see which platforms are supported in each release.

CentOS Stream
GPG key has been updated
still available
supported platform documentation