Add documentation for reverse-proxy use

Fixes #256

Signed-off-by: Nils VAN ZUIJLEN <nils.van-zuijlen@mailo.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/docs/setup/reverse-proxy.md b/docs/setup/reverse-proxy.md
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+# Using a Reverse Proxy with HedgeDoc
+
+If you want to use a reverse proxy to serve HedgeDoc, here are the essential
+configs that you'll have to do.
+
+This documentation will cover HTTPS setup, with comments for HTTP setup.
+
+## HedgeDoc config
+
+[Full explaination of the configuration options](../configuration.md)
+
+| `config.json` parameter | Environment variable | Value | Example |
+|-------------------------|----------------------|-------|---------|
+| `domain` | `CMD_DOMAIN` | The full domain where your instance will be available | `hedgedoc.example.com` |
+| `host` | `CMD_HOST` | An ip or domain name that is only available to HedgeDoc and your reverse proxy | `localhost` |
+| `port` | `CMD_PORT` | An available port number on that IP | `3000` |
+| `path` | `CMD_PATH` | path to UNIX domain socket to listen on (if specified, `host` or `CMD_HOST` and `port` or `CMD_PORT` are ignored) | `/var/run/hedgedoc.sock` |
+| `protocolUseSSL` | `CMD_PROTOCOL_USESSL` | `true` if you want to serve your instance over SSL (HTTPS), `false` if you want to use plain HTTP | `true` |
+| `useSSL` |  | `false`, the communications between HedgeDoc and the proxy are unencrypted | `false` |
+| `urlAddPort` | `CMD_URL_ADDPORT` | `false`, HedgeDoc should not append its port to the URLs it links | `false` |
+| `hsts.enable` | `CMD_HSTS_ENABLE` | `true` if you host over SSL, `false` otherwise | `true` |
+
+
+## Reverse Proxy config
+
+### Generic
+
+The reverse proxy must allow websocket `Upgrade` requests at path `/sockets.io/`.
+
+It must pass through the scheme used by the client (http or https).
+
+### nGinx
+
+Here is an example configuration for nGinx.
+
+```
+map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+}
+server {
+        server_name hedgedoc.example.com;
+
+        location / {
+                proxy_pass http://127.0.0.1:3000;
+                proxy_set_header Host $host; 
+                proxy_set_header X-Real-IP $remote_addr; 
+                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
+                proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        location /socket.io/ {
+                proxy_pass http://127.0.0.1:3000;
+                proxy_set_header Host $host; 
+                proxy_set_header X-Real-IP $remote_addr; 
+                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
+                proxy_set_header X-Forwarded-Proto $scheme;
+                proxy_set_header Upgrade $http_upgrade;
+                proxy_set_header Connection $connection_upgrade;
+        }
+
+    listen [::]:443 ssl http2;
+    listen 443 ssl http2;
+    ssl_certificate fullchain.pem;
+    ssl_certificate_key privkey.pem;
+    include options-ssl-nginx.conf;
+    ssl_dhparam ssl-dhparams.pem;
+}
+```