Advances in Computers. Vol. 28 by Marshall C. Yovits

By Marshall C. Yovits

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Definitions provide a way to programmatically describe what these components look like, and implement any logic that they might need. °° Ruby libraries: This includes any re-usable code that your recipes need and can be included in the cookbook. Things that go in here are accessible by your recipes and automatically loaded for you. °° Support Files: These are arbitrary data files that don't fall into any of the other categories. °° Tests: Recipes, being composed of Ruby code, can include unit tests or cucumber tests to verify that the logic works.

Executing Ruby: To execute some arbitrary Ruby code, you use the <% %> container. The <% tag indicates the beginning of the Ruby code, and %> tag indicates the end of the block. The block can span multiple lines or just one single line. each do |value| %> Non-ruby text... <% end %> The preceding code would yield the following output: Non-ruby text... Non-ruby text... Non-ruby text... ÊÊ Variable replacement: ERB has syntax for replacing the block with the results of the block, and that container is similar to the last one, with the addition of the equal sign inside the opening tag.

Additionally, you may pass variables into the template resource using the variables attribute inside the resource block. com DocumentRoot <%= @params[:document_root] %> Where to store templates The templates directory has its own directory hierarchy inside of it, a mandatory one named default and then any platform-specific or host-specific directories alongside it. Chef has a specific order in which it will search the directories for a template: 1. Hostname 2. Distribution-version 3.

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