Fluent Bit: Official Manual
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4.0
  • Fluent Bit 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
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      • 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
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        • Record Accessor
      • Unit Sizes
      • Multiline Parsing
    • Transport Security
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    • 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
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      • 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
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      • UDP
      • Windows Event Log
      • Windows Event Log (winevtlog)
      • Windows Exporter Metrics
    • Parsers
      • Configuring Parser
      • JSON
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      • Decoders
    • Processors
      • Content Modifier
      • Labels
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      • OpenTelemetry Envelope
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      • 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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  1. Administration
  2. Configuring Fluent Bit

Unit Sizes

Last updated 5 days ago

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Some configuration directives in Fluent Bit refer to unit sizes such as when defining the size of a buffer or specific limits. Plugins like , or generic properties like use unit sizes.

v0.11.10 standardized unit sizes across the core and plugins. The following table describes the options that can be used and what they mean:

Suffix
Description
Example

When a suffix isn't specified, assume that the value given is a bytes representation.

Specifying a value of 32000 means 32000 bytes.

k, K, KB, kb

Kilobyte: a unit of memory equal to 1,000 bytes.

32k means 32000 bytes.

m, M, MB, mb

Megabyte: a unit of memory equal to 1,000,000 bytes.

1M means 1000000 bytes.

g, G, GB, gb

Gigabyte: a unit of memory equal to 1,000,000,000 bytes.

1G means 1000000000 bytes.

Tail Input
Forward Input
Mem_Buf_Limit
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