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build-with-static-configuration.md

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Build with static configuration

Fluent Bit in normal operation mode is configurable through text files or using specific arguments in the command line. Although this is the ideal deployment case, there are scenarios where a more restricted configuration is required. Static configuration mode restricts configuration ability.

Static configuration mode includes a built-in configuration in the final binary of Fluent Bit, disabling the usage of external files or flags at runtime.

Get started

Requirements

The following steps assume you are familiar with configuring Fluent Bit using text files and you have experience building it from scratch as described in Build and Install.

Configuration Directory

In your file system, prepare a specific directory that will be used as an entry point for the build system to lookup and parse the configuration files. This directory must contain a minimum of one configuration file called fluent-bit.conf containing the required SERVICE, INPUT, and OUTPUT sections.

As an example, create a new fluent-bit.conf file with the following content:

[SERVICE]
    Flush     1
    Daemon    off
    Log_Level info

[INPUT]
    Name      cpu

[OUTPUT]
    Name      stdout
    Match     *

This configuration calculates CPU metrics from the running system and prints them to the standard output interface.

Build with custom configuration

  1. Go to the Fluent Bit source code build directory:

    cd fluent-bit/build/

  2. Run CMake, appending the FLB_STATIC_CONF option pointing to the configuration directory recently created:

    cmake -DFLB_STATIC_CONF=/path/to/my/confdir/

  3. Build Fluent Bit:

    make

The generated fluent-bit binary is ready to run without additional configuration:

$ bin/fluent-bit
Fluent-Bit v0.15.0
Copyright (C) Treasure Data

[2018/10/19 15:32:31] [ info] [engine] started (pid=15186)
[0] cpu.local: [1539984752.000347547, {"cpu_p"=>0.750000, "user_p"=>0.500000, "system_p"=>0.250000, "cpu0.p_cpu"=>1.000000, "cpu0.p_user"=>1.000000, "cpu0.p_system"=>0.000000, "cpu1.p_cpu"=>0.000000, "cpu1.p_user"=>0.000000, "cpu1.p_system"=>0.000000, "cpu2.p_cpu"=>0.000000, "cpu2.p_user"=>0.000000, "cpu2.p_system"=>0.000000, "cpu3.p_cpu"=>1.000000, "cpu3.p_user"=>1.000000, "cpu3.p_system"=>0.000000}]