prepping lms-preview role for PR

playbooks/roles/gunicorn/templates/lms-preview.conf.j2

+# gunicorn
+
+description "gunicorn server"
+author "Calen Pennington <cpennington@mitx.mit.edu>"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+respawn
+respawn limit 3 30
+
+env PID=/var/tmp/lms.pid
+#env NEW_RELIC_CONFIG_FILE=${app_base_dir}/newrelic.ini
+#env NEWRELIC=${venv_dir}/bin/newrelic-admin
+env WORKERS={{ ansible_processor_cores * 2 }}
+env PORT=8020
+env LANG=en_US.UTF-8
+env DJANGO_SETTINGS_MODULE=lms.envs.aws
+env SERVICE_VARIANT="lms-preview"
+
+
+chdir ${app_base_dir}/mitx
+setuid www-data
+
+exec ${venv_dir}/bin/gunicorn --preload -b 127.0.0.1:$PORT -w $WORKERS --timeout=300 --pythonpath=${app_base_dir}/mitx lms.wsgi
+
+post-start script
+  while true
+  do
+    if $(curl -s -i localhost:$PORT/heartbeat | egrep -q '200 OK'); then
+      break;
+    else
+      sleep 1;
+    fi
+  done
+end script
+

playbooks/roles/lms-preview/templates/auth.json.j2

-{{ lms_auth_config | to_nice_json }}
+{{ lms_preview_auth_config | to_nice_json }}

playbooks/roles/lms-preview/templates/env.json.j2

-{{ lms_env_config | to_nice_json }}
+{{ lms_preview_env_config | to_nice_json }}

playbooks/secure_example/vars/edxapp_prod_vars.yml

 ---
-lms_auth_config:
+#Use YAML references (& and *) and hash merge <<: to factor out shared settings
+#see http://atechie.net/2009/07/merging-hashes-in-yaml-conf-files/
+lms_auth_config:  &lms_auth
   'ANALYTICS_API_KEY':  'hidden-prod'
   'AWS_ACCESS_KEY_ID':  'hidden-prod'
   'AWS_SECRET_ACCESS_KEY':  'hidden-prod'
@@ -17,7 +19,7 @@ lms_auth_config:
       'USER':  'hidden-prod'}
   'MODULESTORE':
     'default':
-      'OPTIONS':
+      'OPTIONS':  &lms_modulestore_default_options
         'collection':  'hidden-prod'
         'db':  'hidden-prod'
         'default_class':  'hidden-prod'
@@ -39,7 +41,7 @@ lms_auth_config:
       'username':  'hidden-prod'}
     'url':  'hidden-prod'
  
-lms_env_config:
+lms_env_config:  &lms_env
   'SYSLOG_SERVER':  'hidden-prod'
   'SITE_NAME':  'hidden-prod'
   'LOG_DIR':  'hidden-prod'
@@ -51,7 +53,7 @@ lms_env_config:
   'ADMINS' : 
   - ['name', 'email']
   'TIME_ZONE': 'America/New_York'
-  'CACHES':
+  'CACHES':  &lms_caches
     'default':
       'KEY_PREFIX':  'hidden-prod'
       'LOCATION': [ 'hidden-prod',
@@ -144,4 +146,23 @@ cms_env_config:
     'DISABLE_COURSE_CREATION': false
     'SEGMENT_IO': false
 
+lms_preview_auth_config:
+  <<: *lms_auth
+  'MODULESTORE':
+    'default':
+      'ENGINE': 'xmodule.modulestore.mongo.DraftMongoModuleStore'
+      'OPTIONS': *lms_modulestore_default_options
+
+lms_preview_env_config:
+  <<: *lms_env
+  'SITE_NAME':  'preview.class.stanford.edu'
+  'COMMENTS_SERVICE_KEY':  false
+  'CACHES': 
+    <<: *lms_caches
+    'general':
+      'BACKEND' : 'django.core.cache.backends.memcached.MemcachedCache'
+      'KEY_PREFIX':  'preview.edx.org'
+      'KEY_FUNCTION': 'util.memcache.safe_key'
+      'LOCATION': [ 'vpc-974dbeff-cache.oyg26r.0001.usw1.cache.amazonaws.com:12345',
+                    'vpc-974dbeff-cache.oyg26r.0002.usw1.cache.amazonaws.com:12345' ]