diff --git a/ansible/roles/dns/defaults/main.yml b/ansible/roles/dns/defaults/main.yml
new file mode 100644
index 0000000..f69d965
--- /dev/null
+++ b/ansible/roles/dns/defaults/main.yml
@@ -0,0 +1,3 @@
+---
+# Default rule for tarball naming translation
+dns_server_image_tar: "{{ dns_server_image | regex_replace('(\\/|\\:)', '_') }}.tar"