Update u_e-nginx.md

docs/u_e-nginx.md

@@ -1,11 +1,19 @@
+## SSL
+
+Please see [Advanced SSL](https://mailcow.github.io/mailcow-dockerized-docs/firststeps-ssl/) and explicitly check `ADDITIONAL_SERVER_NAMES` for SSL configuration.
+
+Please do not add ADDITIONAL_SERVER_NAMES when you plan to use a different web root.
+
+## New site
+
 To create persistent (over updates) sites hosted by mailcow: dockerized, a new site configuration must be placed inside `data/conf/nginx/`:
 
+A good template to begin with:
+
 ```
 nano data/conf/nginx/my_custom_site.conf
 ```
 
-A good template to begin with:
-
 ``` hl_lines="16"
 server {
   ssl_certificate /etc/ssl/mail/cert.pem;
@@ -19,15 +27,20 @@ server {
   ssl_session_tickets off;
   index index.php index.html;
   client_max_body_size 0;
+  # Location: data/web
   root /web;
+  # Location: data/web/mysite.com
+  #root /web/mysite.com
   include /etc/nginx/conf.d/listen_plain.active;
   include /etc/nginx/conf.d/listen_ssl.active;
   server_name mysite.example.org;
   server_tokens off;
 
+  # This allows acme to be validated even with a different web root
   location ^~ /.well-known/acme-challenge/ {
-    allow all;
     default_type "text/plain";
+    rewrite /.well-known/acme-challenge/(.*) /$1 break;
+    root /web/.well-known/acme-challenge/;
   }
 
   if ($scheme = http) {
@@ -36,8 +49,14 @@ server {
 }
 ```
 
+## New site with proxy to a remote location
+
 Another example with a reverse proxy configuration:
 
+```
+nano data/conf/nginx/my_custom_site.conf
+```
+
 ``` hl_lines="16 28"
 server {
   ssl_certificate /etc/ssl/mail/cert.pem;
@@ -77,8 +96,9 @@ server {
 }
 ```
 
+## Config expansion in mailcows Nginx
 
-The filename is not important, as long as the filename carries a .conf extension.
+The filename used for a new site is not important, as long as the filename carries a .conf extension.
 
 It is also possible to extend the configuration of the default file `site.conf` file:
 
@@ -86,7 +106,7 @@ It is also possible to extend the configuration of the default file `site.conf`
 nano data/conf/nginx/site.my_content.custom
 ```
 
-This filename does not need to have a ".conf" extension, but follows the pattern `site.*.custom`, where `*` is a custom name.
+This filename does not need to have a ".conf" extension but follows the pattern `site.*.custom`, where `*` is a custom name.
 
 If PHP is to be included in a custom site, please use the PHP-FPM listener on phpfpm:9002 or create a new listener in `data/conf/phpfpm/php-fpm.d/pools.conf`.
 
@@ -96,3 +116,4 @@ Restart Nginx (and PHP-FPM, if a new listener was created):
 docker-compose restart nginx-mailcow
 docker-compose restart php-fpm-mailcow
 ```
+