Merge "Add parameter ExtraHostFileEntries"

overcloud.j2.yaml

@@ -59,6 +59,10 @@ parameters:
       The DNS name of this cloud's provisioning network endpoint. E.g.
       'ci-overcloud.ctlplane.tripleo.org'.
     type: string
+  ExtraHostFileEntries:
+    default: []
+    description: List of extra hosts entries to be appended to /etc/hosts
+    type: comma_delimited_list
   ExtraConfig:
     default: {}
     description: |
@@ -617,6 +621,7 @@ resources:
             - ""
             - {get_attr: [{{role.name}}, hosts_entry]}
 {% endfor %}
+        - {get_param: ExtraHostFileEntries}
 
   allNodesConfig:
     type: OS::TripleO::AllNodes::SoftwareConfig