attributes.rb

unless hasoffers[:config][:db][:master].has_key?(:host)
  hasoffers[:config][:db][:master][:host] = "192.168.2.128"
end

unless hasoffers[:config][:db][:master].has_key?(:port)
  hasoffers[:config][:db][:master][:port] = "3306"
end

unless hasoffers[:config][:db][:slave].has_key?(:host)
  hasoffers[:config][:db][:slave][:host] = "192.168.2.129"
end

unless hasoffers[:config][:db][:slave].has_key?(:port)
  hasoffers[:config][:db][:slave][:port] = "3306"
end

metadata.rb

attribute 'hasoffers/config/db/mysql/',
  :display_name => "mysql_rousername",
  :description => "hasoffers { config { db { mysql { ro_username } }}}",
  :multiple_values => true,
  :type => "string"
  :required => true,
  :recipes => [ 'hasoffers::hasoffers' ],