Recipes
Recipes are the core component of getting things done. They are scripts, written in Ruby, that provide the instructions to be executed on end hosts when the Chef client is run. Recipes are placed in the recipes directory inside of a cookbook, and each recipe is designed to achieve a specific purpose, such as provisioning accounts, installing and configuring a database server, and custom software deployments.
Recipes combine configuration data with the current state of the host to execute commands that will cause the system to enter a new state. For example, a PostgreSQL database server recipe would have the goal of installing and starting a PostgreSQL server on any host that runs the recipe. Let's look at a few possible starting states ...
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