Add rate limiting to the lms course urls.

playbooks/roles/nginx/templates/edx/app/nginx/sites-available/lms.j2

@@ -10,6 +10,9 @@ upstream lms-backend {
     {% endfor %}
 }
 
+# Make Zone
+limit_req_zone $cookie_{{ EDXAPP_SESSION_COOKIE_NAME }} zone=cookies:10m rate=10r/s;
+
 server {
   # LMS configuration file for nginx, templated by ansible
 
@@ -68,6 +71,13 @@ server {
     try_files $uri @proxy_to_lms_app;
   }
 
+  location /course {
+    # Set Limit  
+    limit_req zone=cookies burst=50;
+    {% include "basic-auth.j2" %}
+    try_files $uri @proxy_to_lms_app;
+  }
+
   {% include "robots.j2" %}
   {% include "static-files.j2" %}