Building Google Cloud Platform Solutions

Application configuration files

On Google App Engine, the primary method of externalizing application configuration is through the use of the app.yaml configuration file. In addition to configuration properties that affect how App Engine deploys and manages services (for example, scaling and memory), the App Engine configuration file allows users to define environment variables, which will be made available to running applications. Environment variables are perhaps the most common method for externalizing configuration. Services built to pull configuration from environment variables will generally be more portable than other methods.

To configure environment variables on App Engine applications, include an env_variables block in your app.yaml ...