dokku/docs/configuration-management.md

Configuration management

Typically an application will require some configuration to run properly. Dokku supports application configuration via environment variables. Environment variables may contain private data, such as passwords or API keys, so it is not recommend to store them in your application's repository.

The config plugin provides the following commands to manage your variables:

config <app> - display the config vars for an app
config:get <app> KEY - display a config value for an app
config:set <app> KEY1=VALUE1 [KEY2=VALUE2 ...] - set one or more config vars
config:unset <app> KEY1 [KEY2 ...] - unset one or more config vars