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Elastic Docs ›Filebeat Reference [5.3] ›Configuring Filebeat

Using Environment Variables in the Configuration

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Using Environment Variables in the Configuration

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You can use environment variable references in the filebeat.yml file to set values that need to be configurable during deployment. To do this, use:

${VAR}

Where VAR is the name of the environment variable.

Each variable reference is replaced at startup by the value of the environment variable. The replacement is case-sensitive and occurs before the YAML file is parsed. References to undefined variables are replaced by empty strings unless you specify a default value. To specify a default value, use:

${VAR:default_value}

Where default_value is the value to use if the environment variable is undefined.

If you need to use a literal ${ in your configuration file then you can write $${ to escape the expansion.

After changing the value of an environment variable, you need to restart Filebeat to pick up the new value.

Examples

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Here are some examples of configurations that use environment variables and what each configuration looks like after replacement:

Config source Environment setting Config after replacement

name: ${NAME}

export NAME=elastic

name: elastic

name: ${NAME}

no setting

name:

name: ${NAME:beats}

no setting

name: beats

name: ${NAME:beats}

export NAME=elastic

name: elastic
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