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22.4.4
22.4.4
  • Calyptia for Fluent Bit
  • Differences with Open Source
  • Performance and Benchmarking
  • Concepts
    • Key Concepts
    • Buffering
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      • Input
      • Parser
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    • Getting Started with Calyptia Fluent Bit
    • Supported Operating Systems Platforms
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      • Amazon Linux
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      • Debian
      • Ubuntu
    • Docker
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  • Administration
    • Configuring Calyptia Fluent Bit
      • Classic mode
        • Format and Schema
        • Configuration File
        • Variables
        • Commands
        • Upstream Servers
        • Record Accessor
      • Unit Sizes
      • Multiline Parsing
    • Security
    • Buffering & Storage
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    • Scheduling and Retries
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  • Local Testing
    • Validating your Data and Structure
    • Running a Pipeline Locally
  • Data Pipeline
    • Inputs
      • Collectd
      • CPU Log Based Metrics
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      • Docker Log Based Metrics
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      • Random
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      • Standard Input
      • StatsD
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      • Windows Event Log (winevtlog)
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    • Parsers
      • Configuring Parser
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      • AWS Metadata
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      • Kubernetes
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      • Modify
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      • Rewrite Tag
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      • Tensorflow
    • Outputs
      • Amazon CloudWatch
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      • Prometheus Remote Write
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      • Slack
      • Splunk
      • Stackdriver
      • Standard Output
      • Syslog
      • TCP & TLS
      • Treasure Data
      • WebSocket
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On this page
  1. Administration
  2. Configuring Calyptia Fluent Bit
  3. Classic mode

Variables

Fluent Bit supports the usage of environment variables in any value associated to a key when using a configuration file.

The variables are case sensitive and can be used in the following format:

${MY_VARIABLE}

When Fluent Bit starts, the configuration reader will detect any request for ${MY_VARIABLE} and will try to resolve its value.

Example

Create the following configuration file

[SERVICE]
    Flush        1
    Daemon       Off
    Log_Level    info

[INPUT]
    Name cpu
    Tag  cpu.local

[OUTPUT]
    Name  ${MY_OUTPUT}
    Match *

Open a terminal and set the environment variable:

$ export MY_OUTPUT=stdout

The above command set the 'stdout' value to the variable MY_OUTPUT.

Run Fluent Bit with the recently created configuration file:

$ bin/calyptia-fluent-bit -c calyptia-fluent-bit.conf

[2020/03/03 12:25:25] [ info] [engine] started
[0] cpu.local: [1491243925, {"cpu_p"=>1.750000, "user_p"=>1.750000, "system_p"=>0.000000, "cpu0.p_cpu"=>3.000000, "cpu0.p_user"=>2.000000, "cpu0.p_system"=>1.000000, "cpu1.p_cpu"=>0.000000, "cpu1.p_user"=>0.000000, "cpu1.p_system"=>0.000000, "cpu2.p_cpu"=>4.000000, "cpu2.p_user"=>4.000000, "cpu2.p_system"=>0.000000, "cpu3.p_cpu"=>1.000000, "cpu3.p_user"=>1.000000, "cpu3.p_system"=>0.000000}]

As you can see the service worked properly as the configuration was valid.

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Last updated 2 years ago