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Overriding the configuration with environment vars

Last update: Jul 10, 2020

When KrakenD runs, all the behavior is loaded from the configuration file. For each configuration value that isn’t nested (meaning first-level properties of the configuration), you can override its value with an environment variable.

All configuration environment variables must have the prefix KRAKEND_ and declared in uppercase. The variable name after the prefix must match the property in the configuration value.

For instance, take the following krakend.json configuration as an example:

    "version": 2,
    "timeout": "3s",
    "name": "Example gateway."

Now run krakend with the following command:

Example: Override configuration with env vars 
$KRAKEND_NAME="Build ABC0123" KRAKEND_TIMEOUT="500ms" krakend run -c krakend.json

The resulting configuration will be:

    "version": 2,
    "timeout": "500ms",
    "name": "Build ABC0123"

NOTE: The configuration file is not changed. The values above are a representation of the final mapped values.

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