[
-<% if scope.lookupvar('cluster') -%>
-{rabbit, [{cluster_nodes, ['<%= scope.lookupvar('clustermembers').to_a.flatten.join("', '") %>']}]}
+{rabbit, [
+<% if @cluster -%>
+ {cluster_nodes, ['<%= @clustermembers.to_a.flatten.join("', '") %>']}
<% end -%>