.env.example

@@ -131,6 +131,12 @@ UOLINK_PROTOCOL=1
 #                         register endpoints on a different host than NTFY_BASE_URL.
 #   NTFY_PUBLISH_TOKEN    Optional. The content-free-tickle design needs NO token;
 #                         set one only to require auth on backend→ntfy publishes.
+#   NTFY_HOST_PORT        Host port the ntfy container publishes :80 on (default
+#                         2586). The public reverse proxy forwards the notification
+#                         subdomain to host:NTFY_HOST_PORT — required because the
+#                         proxy lives outside the compose network and cannot reach
+#                         ntfy any other way. Change only on a host-port conflict.
 NTFY_BASE_URL=https://ntfy.example.com
 # NTFY_ALLOWED_ORIGINS=https://ntfy.example.com
 # NTFY_PUBLISH_TOKEN=
+# NTFY_HOST_PORT=2586

docker-compose.yml

@@ -74,9 +74,20 @@ services:
     volumes:
       - ntfydata:/var/lib/ntfy
       - ./ntfy/server.yml:/etc/ntfy/server.yml:ro
-    # No published host port — devices reach ntfy through the public reverse proxy
+    # Published so the PUBLIC reverse proxy (Pangolin) can forward the
-    # on its own hostname; the backend publisher reaches it over the private
+    # notification subdomain here. Pangolin lives OUTSIDE the compose network and
-    # compose network. Never publish this directly.
+    # reaches every service through a published host port — never by joining the
+    # internal network — exactly like `app` above (3000). So ntfy must publish a
+    # port too: the reverse proxy maps notify.<host> -> host:NTFY_HOST_PORT ->
+    # ntfy:80. Unlike INTERNAL_PORT / the bot, ntfy is DEVICE-facing, so it is
+    # SUPPOSED to be reachable through the proxy. Binds 0.0.0.0 (no 127.0.0.1
+    # prefix) so Pangolin can reach the container. Both the app (SSE subscribe) and
+    # the backend (POSTing content-free tickles to each device's registered
+    # endpoint) reach ntfy on this same public origin — NTFY_ALLOWED_ORIGINS pins
+    # it — so all ntfy traffic flows through the proxy; there is no separate
+    # internal publish port.
+    ports:
+      - "${NTFY_HOST_PORT:-2586}:80"
 
   bot:
     # Same as app: prebuilt bot image, pulled in production. Build locally via

ntfy/server.yml

@@ -13,8 +13,12 @@
 # a placeholder for a bare `ntfy serve`.
 base-url: "https://ntfy.localhost"
 
-# Served on the private compose network; the public reverse proxy terminates TLS
+# ntfy listens on :80 inside the container. docker-compose.yml publishes this on
-# and forwards to this port. docker-compose.yml publishes NO host port for ntfy.
+# a host port (NTFY_HOST_PORT, default 2586) so the public reverse proxy — which
+# lives OUTSIDE the compose network — can terminate TLS and forward the
+# notification subdomain to it. Both the app (SSE subscribe) and the backend
+# (POSTing content-free tickles to registered device endpoints) reach ntfy on
+# that public origin, so all traffic flows through the proxy.
 listen-http: ":80"
 behind-proxy: true