Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The earlier incarnations of Hiera (version 3 or earlier) used a single, entirely global hiera.yaml."

A block of code is set as follows:

lookup({
   'name'  => 'classification',
   'merge' => {
     'strategy'        => 'deep',
     'knockout_prefix' => '--',
   },
 })

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

lookup({
   'name'  => 'classification',
   'merge' => {
     'strategy' => 'deep',
     'knockout_prefix' => '--',
   },
 })

Any command-line input or output is written as follows:

$ sudo /opt/puppetlabs/puppet/bin/gem install hiera-eyaml

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "We can reach the plugin page by clicking on Manage Jenkins on the left-hand side of the screen."