split out head/compute diag roles, collect diag on head node
diff --git a/inventory/single-localhost b/inventory/single-localhost
index 36fdcaa..5b70063 100644
--- a/inventory/single-localhost
+++ b/inventory/single-localhost
@@ -7,3 +7,6 @@
 [cloudlab]
 localhost
 
+[compute]
+nova-compute-1
+