use hostname variable, expect it to be overrriden

playbooks/roles/neo4j/defaults/main.yml

@@ -16,8 +16,7 @@
 #
 # vars are namespaced with the module name.
 #
-neo4j_role_name: neo4j
-neo4j_server_name: "coursegraph.edx.org"
+NEO4J_SERVER_NAME: "localhost"
 
 neo4j_gpg_key_url: https://debian.neo4j.org/neotechnology.gpg.key
 neo4j_apt_repository: "deb http://debian.neo4j.org/repo stable/"

playbooks/roles/neo4j/templates/edx/app/nginx/sites-available/coursegraph.j2

@@ -10,8 +10,7 @@
 {% endif %}
 
 server {
-#   server_name {{ neo4j_server_name }};
-  server_name localhost;
+  server_name {{ NEO4J_SERVER_NAME }};
 
   {% if NGINX_ENABLE_SSL %}
 
@@ -22,7 +21,6 @@ server {
   add_header Strict-Transport-Security "max-age=31536000; includeSubDomains";
 
   {% else %}
-#   listen {{ neo4j_http_port }} {{ default_site }};
   listen 80 {{ default_site }};
   {% endif %}
 
@@ -38,7 +36,7 @@ server {
     proxy_set_header Host $http_host;
 
     proxy_redirect off;
-    proxy_pass http://127.0.0.1:7473;
+    proxy_pass http://127.0.0.1:{{ neo4j_http_port }};
   }
 
   # Forward to HTTPS if we're an HTTP request...