fix(deploy): use datum container dns

README.md

@@ -46,7 +46,12 @@ Allowlist of npubs is set via `NOSTR_ALLOWED_NPUBS`. Anything else is rejected b
    - Repository URL: `https://git.tx1138.com/lfg2025/gashboard`
    - Compose path: `docker-compose.yml`
    - Add env vars (see `.env.example`)
-   - Set the `external` network in the compose file to match your Datum app's docker network (find with `docker network ls` on the Umbrel)
+   - Set `DATUM_NETWORK` to the network attached to `datum_datum_1`:
+     ```bash
+     docker inspect -f '{{range $name, $_ := .NetworkSettings.Networks}}{{$name}}{{"\n"}}{{end}}' datum_datum_1
+     ```
+   - On Umbrel this is usually `umbrel_main_network`, which is the compose default.
+   - Leave `DATUM_URL` unset unless you need to override it. The default is `http://datum_datum_1:21000`, which avoids Umbrel's host proxy and stale container IPs.
 
 4. Open the dashboard, log in with one of the allowed npubs, watch your boards lose at hashing in style.
 

docker-compose.yml

@@ -1,8 +1,9 @@
 version: "3.9"
 
 # gashboard — deploy as a Portainer Stack on the same Umbrel host that runs Datum.
-# IMPORTANT: set `networks.datum.name` below to the actual docker network the
-# Datum app uses (find it on the Umbrel with `docker network ls | grep datum`).
+# IMPORTANT: set DATUM_NETWORK to the actual Docker network used by datum_datum_1.
+# Find it with:
+# docker inspect -f '{{range $name, $_ := .NetworkSettings.Networks}}{{$name}}{{"\n"}}{{end}}' datum_datum_1
 
 services:
   gashboard:
@@ -22,10 +23,9 @@ services:
       PORT: "1337"
       LOG_LEVEL: "${LOG_LEVEL:-info}"
       CORS_ORIGIN: "${CORS_ORIGIN:-}"
-      # Direct container IP from umbrel_main_network. Bypasses Docker DNS
-      # (which doesn't reliably alias container names across stacks). If your
-      # Datum container moves to a different IP, override DATUM_URL in env.
-      DATUM_URL: "${DATUM_URL:-http://10.21.0.11:21000}"
+      # Reach the Datum gateway container directly on its Docker network.
+      # Do not use the Umbrel host proxy here; it serves the Umbrel web shell.
+      DATUM_URL: "${DATUM_URL:-http://datum_datum_1:21000}"
       DATUM_ADMIN_USER: "${DATUM_ADMIN_USER:-admin}"
       DATUM_ADMIN_PASSWORD: "${DATUM_ADMIN_PASSWORD?must be set}"
       DATUM_POLL_INTERVAL_MS: "${DATUM_POLL_INTERVAL_MS:-5000}"
@@ -41,9 +41,10 @@ services:
       retries: 3
       start_period: 15s
     networks:
-      - umbrel_main_network
+      - datum_network
       - default
 
 networks:
-  umbrel_main_network:
+  datum_network:
     external: true
+    name: "${DATUM_NETWORK:-umbrel_main_network}"