What file in a module serves as the entry point for Puppet class definitions?

In a Puppet module, the entry point for class definitions is the "manifests/init.pp" file. This file is essential because it defines the main class for the module, which can then invoke or include other classes, resources, or declared types. When Puppet loads a module, it automatically looks for the init.pp file to resolve the main class, making it crucial for the module's structure and usability.

The init.pp file allows you to group related classes, ensuring that any necessary setup code is run when the module is included in a Puppet manifest. By organizing code in this manner, it facilitates modularization, promotes reusability, and supports hierarchical structures within Puppet.

Other options, while they might represent valid files or concepts within Puppet modules, do not serve the same function as init.pp. For instance, manifests/class.pp might contain specific class definitions but is not the primary entry point for the module as a whole. The lib/module.pp file suggests a location for Ruby code but is not utilized for class declarations. Similarly, manifests/main.pp might be confused with init.pp but is not a standard naming convention recognized for class definitions in Puppet modules.