Put overrideables in all caps.

playbooks/roles/forum/defaults/main.yml

@@ -17,7 +17,7 @@ forum_environment:
   GEM_PATH: "{{ forum_gem_root }}"
   PATH: "{{ forum_path }}"
   MONGOHQ_USER: "{{ forum_mongo_user }}"
-  MONGOHQ_PASS: "{{ forum_mongo_password }}"
+  MONGOHQ_PASS: "{{ FORUM_MONGO_PASSWORD }}"
   RACK_ENV: "{{ forum_rack_env }}"
   SINATRA_ENV: "{{ forum_sinatra_env }}"
   API_KEY: "{{ forum_api_key }}"
@@ -29,12 +29,12 @@ forum_user: "forum"
 forum_ruby_version: "1.9.3-p448"
 forum_source_repo: "https://github.com/edx/cs_comments_service.git"
 forum_version: "HEAD"
-forum_mongo_user: "cs_comments_service"
-forum_mongo_password: "password"
-forum_mongo_host: "localhost"
-forum_mongo_port: "27010"
+FORUM_MONGO_USER: "cs_comments_service"
+FORUM_MONGO_PASSWORD: "password"
+FORUM_MONGO_HOST: "localhost"
+FORUM_MONGO_PORT: "27010"
 forum_mongo_database: "cs_comments_service"
-forum_mongo_url: "mongodb://{{ forum_mongo_user }}:{{ forum_mongo_password }}@{{ forum_mongo_host }}:{{ forum_mongo_port }}/{{ forum_mongo_database }}"
+forum_mongo_url: "mongodb://{{ FORUM_MONGO_USER }}:{{ FORUM_MONGO_PASSWORD }}@{{ FORUM_MONGO_HOST }}:{{ FORUM_MONGO_PORT }}/{{ forum_mongo_database }}"
 forum_rack_env: "development"
 forum_sinatra_env: "development"
 forum_api_key: "password"
@@ -52,7 +52,7 @@ forum_elasticsearch_url: "http://{{ forum_elasticsearch_host }}:{{ forum_elastic
 #
 forum_services:
   - {service: "sinatra", host: "localhost", port: "4567"}
-  - {service: "mongo", host: "{{ forum_mongo_host  }}", port: "27017"}
-  - {service: "mongo", host: "{{ forum_mongo_host }}", port: "28017"}
+  - {service: "mongo", host: "{{ FORUM_MONGO_HOST  }}", port: "27017"}
+  - {service: "mongo", host: "{{ FORUM_MONGO_HOST }}", port: "28017"}
   - {service: "elasticsearch", host: "{{ forum_elasticsearch_host }}", port: "9200"}
   - {service: "elasticsearch", host: "{{ forum_elasticsearch_host }}", port: "9300"}