Add an unconfigured redis role to start with.

roles/redis/tasks/main.yml

@@ -0,0 +1,9 @@
+- name: install needed packages
+  yum: pkg={{ item }} state=present
+  with_items:
+  - redis
+  tags: redis
+
+- name: start redis
+  service: name=redis state=started enabled=yes
+  tags: redis