add names for public interfaces, add apt-cacher-ng role
diff --git a/cord-single-playbook.yml b/cord-single-playbook.yml
index 1abd9d3..0e28450 100644
--- a/cord-single-playbook.yml
+++ b/cord-single-playbook.yml
@@ -17,6 +17,7 @@
   roles:
     - common-prep
     - cloudlab-prep
+    - apt-cacher-ng
 
 - name: DNS Server Setup
   hosts: head