Chef offers the opportunity to extend the list of available resources by creating a custom Lightweight Resource Provider (LWRP). By creating your own custom resources, you can simplify writing cookbooks because your own custom resources enrich the Chef DSL and make your recipe code more expressive.
Many of the custom resources in Chef's community cookbooks (and elsewhere) are implemented as LWRPs. So, there are many working examples in the real world, such as
apt_repository, and many more.
Create a new cookbook named
greeting and ensure that the
run_list of your node includes
greeting, as described in Creating and using cookbooks recipe of Chapter 1, Chef Infrastructure.