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Dynamic scoping for variables in ERB templates was removed in puppet 4[1] which means that the variables defined in the openstackci::logserver class cannot be found when it is referenced in the httpd::vhost defined type and will be evaluated as nil when puppet runs. Use scope.lookupvar instead to be explicit about the variable's source. [1] https://puppet.com/docs/puppet/4.10/lang_updating_manifests.html#dynamic-scoping-in-erb Change-Id: Iea37fb14bc332cbf2d598b908bce997786814924