Fluent Bit: Official Manual
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1.5
1.5
  • Fluent Bit v1.5 Documentation
  • About
    • What is Fluent Bit ?
    • A Brief History of Fluent Bit
    • Fluentd & Fluent Bit
    • License
  • Concepts
    • Key Concepts
    • Buffering
    • Data Pipeline
      • Input
      • Parser
      • Filter
      • Buffer
      • Router
      • Output
  • Installation
    • 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
    • Yocto / Embedded Linux
    • Windows
  • Administration
    • Configuring Fluent Bit
      • Format and Schema
      • Configuration File
      • Variables
      • Commands
      • Upstream Servers
      • Unit Sizes
      • Record Accessor
    • Security
    • Buffering & Storage
    • Backpressure
    • Scheduling and Retries
    • Networking
    • Memory Management
    • Monitoring
    • Dump Internals / Signal
  • Local Testing
    • Validating your Data and Structure
    • Running a Logging Pipeline Locally
  • Data Pipeline
    • Inputs
      • Collectd
      • CPU Metrics
      • Disk I/O Metrics
      • Docker Events
      • Dummy
      • Exec
      • Forward
      • Head
      • Health
      • Kernel Logs
      • Memory Metrics
      • MQTT
      • Network I/O Metrics
      • Process
      • Random
      • Serial Interface
      • Standard Input
      • Syslog
      • Systemd
      • Tail
      • TCP
      • Thermal
      • Windows Event Log
    • Parsers
      • JSON
      • Regular Expression
      • LTSV
      • Logfmt
      • Decoders
    • Filters
      • AWS Metadata
      • Expect
      • Grep
      • Kubernetes
      • Lua
      • Parser
      • Record Modifier
      • Rewrite Tag
      • Standard Output
      • Throttle
      • Nest
      • Modify
    • Outputs
      • Amazon CloudWatch
      • Azure
      • BigQuery
      • Counter
      • Datadog
      • Elasticsearch
      • File
      • FlowCounter
      • Forward
      • GELF
      • HTTP
      • InfluxDB
      • Kafka
      • Kafka REST Proxy
      • LogDNA
      • NATS
      • New Relic
      • NULL
      • PostgreSQL
      • Stackdriver
      • Standard Output
      • Splunk
      • Syslog
      • TCP & TLS
      • Treasure Data
  • 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
    • Developer guide for beginners on contributing to Fluent Bit
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On this page
  • Configuration Parameters
  • Getting Started
  • Command Line
  • Configuration File

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  1. Data Pipeline
  2. Inputs

Exec

The exec input plugin, allows to execute external program and collects event logs.

Configuration Parameters

The plugin supports the following configuration parameters:

Key

Description

Command

The command to execute.

Parser

Specify the name of a parser to interpret the entry as a structured message.

Interval_Sec

Polling interval (seconds).

Interval_NSec

Polling interval (nanosecond).

Buf_Size

Getting Started

You can run the plugin from the command line or through the configuration file:

Command Line

The following example will read events from the output of ls.

$ fluent-bit -i exec -p 'command=ls /var/log' -o stdout
Fluent Bit v1.x.x
* Copyright (C) 2019-2020 The Fluent Bit Authors
* Copyright (C) 2015-2018 Treasure Data
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2018/03/21 17:46:49] [ info] [engine] started
[0] exec.0: [1521622010.013470159, {"exec"=>"ConsoleKit"}]
[1] exec.0: [1521622010.013490313, {"exec"=>"Xorg.0.log"}]
[2] exec.0: [1521622010.013492079, {"exec"=>"Xorg.0.log.old"}]
[3] exec.0: [1521622010.013493443, {"exec"=>"anaconda.ifcfg.log"}]
[4] exec.0: [1521622010.013494707, {"exec"=>"anaconda.log"}]
[5] exec.0: [1521622010.013496016, {"exec"=>"anaconda.program.log"}]
[6] exec.0: [1521622010.013497225, {"exec"=>"anaconda.storage.log"}]

Configuration File

In your main configuration file append the following Input & Output sections:

[INPUT]
    Name          exec
    Tag           exec_ls
    Command       ls /var/log
    Interval_Sec  1
    Interval_NSec 0
    Buf_Size      8mb

[OUTPUT]
    Name   stdout
    Match  *

Last updated 4 years ago

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Size of the buffer (check for allowed values)

unit sizes