Puppet 2.7 Cookbook

Using array iteration in templates

In the preceding example we saw that you can use Ruby to interpolate different values in templates depending on the result of an expression. You can also use a loop to generate content based on; the elements of an array:

How to do it…

1. Add the following to your manifest:

   $ipaddresses = [ '192.168.0.1',
                    '158.43.128.1',
                    '10.0.75.207' ]
   
   file { "/tmp/addresslist.txt":
       content => template("admin/addresslist.erb")
   }

2. Create the file /etc/puppet/modules/admin/templates/addresslist.erb with the following contents:

   <% ipaddresses.each do |ip| -%>
   IP address <%= ip %> is present.
   <% end -%>

3. Run Puppet:

   # puppet agent --test
   info: Retrieving plugin
   info: Caching catalog for cookbook.bitfieldconsulting.com
   info: Applying configuration ...