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Hostmaster is a number of things, primarily it is an install profile that ties together the functionality of the Hosting and Provisioning frameworks, but it is also the collective name for the entire Hostmaster system.
About Hostmaster
The Hostmaster system is a modular, extensible site instance manager, that allows you to manage many Drupal sites through it's Drupal based user interface. New sites are created simply by creating a new Site node. New services and features can be enabled by simply adding new modules to the system.
Hosting is a component of the Hostmaster system. It provides the front end, and a layer of glue that communicates with the back end provided by the Provisioning framework. It provides a complete interface for customizing aspects of your hosting environment.
About Hostmaster
The Hostmaster system is a modular, extensible site instance manager, that allows you to manage many Drupal sites through it's Drupal based user interface. New sites are created simply by creating a new Site node. New services and features can be enabled by simply adding new modules to the system.