Extending Chef
Chef is developed in the open with flexibility and extensibility in mind. Most of the tools are architected to support loading custom plugins to support development of add-ons for new functionality. As you saw earlier, Knife's cloud service support is provided by plugins, one for each cloud service, including EC2, Azure, and Rackspace cloud. We will look at how that happens so that you can explore writing your own plugins for Knife, Ohai, and other Chef components should the need arise.
In addition to extending Chef's core components directly, it is possible to extend the functionality of your Chef ecosystem by building enhancements to existing tools that can leverage Chef's data APIs to provide data about your infrastructure.
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