Configuration

One of the basic ideas of the Twelve-Factor App is that the code is unique, but it can be adjusted through configuration. This enables the same code to be used and deployed in different environments.

The use of different environments allows testing environments to be set up, where tests can be run without affecting production data. They are a more controlled place for experimenting or trying to replicate real problems in a sandbox. There's also another environment that is not typically thought of as such, which is the local development environment, where developers are able to check that the system works.

Creating a comprehensive and easy-to-use local environment is a critical aspect of developer productivity. When working with a single service or process, such as a web server, it is relatively easy to set up, as most projects will allow starting in a dev mode, but once there are more elements, it becomes more difficult to set up.

Complex settings...