bundles/powerdns: make sure every dns server is able to resolve every other dns server

bundles/powerdns/metadata.py

@@ -102,3 +102,19 @@ def generate_dns_entries_for_nodes(metadata):
             },
         },
     }
+
+
+@metadata_reactor
+def hosts_entries_for_all_dns_servers(metadata):
+    entries = {}
+
+    for rnode in repo.nodes_in_group('dns'):
+        entries[rnode.metadata.get('external_ipv4')] = {
+            rnode.metadata.get('powerdns/my_hostname', node.hostname)
+        }
+
+    return {
+        'hosts': {
+            'entries': entries,
+        },
+    }