diff --git a/inventory/10nmap_inventory.yml b/inventory/10nmap_inventory.yml
index 7b939c7..668f582 100644
--- a/inventory/10nmap_inventory.yml
+++ b/inventory/10nmap_inventory.yml
@@ -14,8 +14,11 @@ ports: no
 
 groups:
   dev_nodes: "'lab-dev' in name"
-  everything_else: "'lab-dev' not in name"
+  tower_nodes: "'lab-tower' in name and 'db' not in name"
+  tower_db_nodes: "'db' in name"
+  tower_isolated_nodes: "'isolated' in name"
   ip_only: "'10.10.42' in name"
 
 
+
 ...
diff --git a/inventory_cache/.keep b/inventory_cache/.keep
deleted file mode 100644
index e69de29..0000000