Chapter 9. Ohai and Its Plugin Ecosystem
As part of chef-client run, one of the concerns is to collect information about the underlying operating system, hardware, and other environment-related details. The chef-client relies on a utility called Ohai for this purpose.
Ohai is a tool that is used to detect attributes on a node and, once it has profiled the concerned node, it can emit a JSON data blob, containing all the attributes collected by it. Ohai can be used as a stand-alone utility. However, generally, a chef-client uses it to collect node attributes. When Ohai is used in stand-alone mode, it emits the data as JSON; however, when used by the chef-client, it reports back the data through node attributes.
Ohai comes with its own set of plugins ...
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