From f2665d28c807b94aecb5d9549534f77ca9ea784a Mon Sep 17 00:00:00 2001
From: Dorian <dorian@Dorians-MacBook-Air.local>
Date: Sat, 9 May 2026 16:29:19 +0100
Subject: [PATCH] Use Datum service network for API polling

---
 .env.example       |  4 ++--
 README.md          | 12 +++++++-----
 docker-compose.yml | 12 ++++++------
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/.env.example b/.env.example
index 1a96368..a2f32db 100644
--- a/.env.example
+++ b/.env.example
@@ -13,9 +13,9 @@ LOG_LEVEL=info
 # STATIC_DIR=
 
 # ---- Datum gateway (the Umbrel app we're polling) ----
-# Use Docker DNS on umbrel_main_network so Datum can be recreated without
+# Use Docker DNS on Datum's app network so Datum can be recreated without
 # changing a stale container IP.
-DATUM_URL=http://datum_datum_1:21000
+DATUM_URL=http://datum:21000
 DATUM_ADMIN_USER=admin
 DATUM_ADMIN_PASSWORD=
 # How often to scrape /clients (ms). Datum updates per-worker hashrate every
diff --git a/README.md b/README.md
index 98d4498..c5d6380 100644
--- a/README.md
+++ b/README.md
@@ -46,13 +46,15 @@ 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`)
-   - Remove any old `DATUM_URL=http://10.21...` value from the stack env vars.
+   - Remove any old `DATUM_URL=http://10.21...` or
+     `DATUM_URL=http://datum_datum_1:21000` 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
+     default the stack uses `http://datum:21000` on Datum's `datum_default`
+     app 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`.
+   - If your Umbrel install uses a different Datum app network or service name,
+     update `datum_default` in `docker-compose.yml` or set
+     `DATUM_URL=http://<service-name>:21000`.
 
 4. Open the dashboard, log in with one of the allowed npubs, watch your boards lose at hashing in style.
 
diff --git a/docker-compose.yml b/docker-compose.yml
index bfc5901..2c67cf6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,7 @@
 # gashboard — deploy as a Portainer Stack on the same Umbrel host that runs Datum.
 #
-# Join Umbrel's shared Docker network so the API can reach Datum by container
-# DNS name instead of a changing container IP.
+# Join Datum's app network so the API can reach Datum by its stable Compose
+# service DNS name instead of a changing container IP.
 
 services:
   gashboard:
@@ -21,9 +21,9 @@ services:
       PORT: "1337"
       LOG_LEVEL: "${LOG_LEVEL:-info}"
       CORS_ORIGIN: "${CORS_ORIGIN:-}"
-      # Reach the Datum gateway container through Docker DNS on Umbrel's shared
+      # Reach the Datum gateway container through Docker DNS on Datum's app
       # network. This avoids hard-coding Datum's changing container IP.
-      DATUM_URL: "${DATUM_URL:-http://datum_datum_1:21000}"
+      DATUM_URL: "${DATUM_URL:-http://datum:21000}"
       DATUM_ADMIN_USER: "${DATUM_ADMIN_USER:-admin}"
       DATUM_ADMIN_PASSWORD: "${DATUM_ADMIN_PASSWORD?must be set}"
       DATUM_POLL_INTERVAL_MS: "${DATUM_POLL_INTERVAL_MS:-5000}"
@@ -34,7 +34,7 @@ services:
     ports:
       - "${PORT:-1337}:1337"
     networks:
-      - umbrel_main_network
+      - datum_default
     healthcheck:
       test: ["CMD", "wget", "-qO-", "http://127.0.0.1:1337/healthz"]
       interval: 30s
@@ -43,5 +43,5 @@ services:
       start_period: 15s
 
 networks:
-  umbrel_main_network:
+  datum_default:
     external: true