Stabilize Datum container networking

README.md

@@ -46,12 +46,13 @@ 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 `DATUM_URL` to Datum's current container IP:
-     ```bash
-     docker inspect -f '{{.NetworkSettings.Networks.umbrel_main_network.IPAddress}}' datum_datum_1
-     ```
-   - Use it as `DATUM_URL=http://<that-ip>:21000`.
-   - If Datum/Umbrel recreates the container, refresh this IP in Portainer and redeploy.
+   - Remove any old `DATUM_URL=http://10.21...` value from the stack env vars.
+     Leave `DATUM_URL` unset unless your Datum container name is different. By
+     default the stack uses `http://datum_datum_1:21000` on Umbrel's
+     `umbrel_main_network`, so Datum can be recreated without changing a stale
+     IP address.
+   - If your Umbrel install uses a different Datum container name, set
+     `DATUM_URL=http://<container-name>:21000`.
 
 4. Open the dashboard, log in with one of the allowed npubs, watch your boards lose at hashing in style.