--- a/contrib/provision/roles/tram-im/tasks/main.yml	Tue Apr 05 22:13:56 2016 +0800
+++ b/contrib/provision/roles/tram-im/tasks/main.yml	Tue Apr 05 22:20:37 2016 +0800
@@ -9,6 +9,18 @@
     - git # for 3rd-party libraries
   tags: [packages]
 
+- stat: path='{{ ssl_cert }}'
+  register: certfile
+
+- stat: path='{{ ssl_key }}'
+  register: keyfile
+
+- name: Ensure certificate exists
+  assert:
+    that:
+      - '{{ certfile.stat.exists }}'
+      - '{{ keyfile.stat.exists }}'
+
 - name: Create user
   user: name={{ user }}