As you start using different domains for different environments, you will feel the need to restrict gear sizes for different domains. In particular, you would like to use small gears for development and large gears for production. When you create an application, you can specify the gear size for that application. This does not help much as it applies only to that application. To avoid using large gears for development, you would want to restrict the development domain only to small gears.
To complete this recipe, you will need to have rhc installed on your machine. Please refer to the Installing the OpenShift rhc command-line client recipe in Chapter 1, Getting Started with OpenShift, for instructions.
To restrict the devosbook domain to only small gears, run the following command:
$ rhc configure-domain --allowed-gear-sizes small --namespace devosbook