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docs/install-profiles.md

@@ -34,8 +34,19 @@ Use this when the device should only run the Douyin or YouTube business stack.
 - Installs the Android web panel based on `web-scrcpy`
 - Starts SRS
 - Builds the web console and enables `live-console.service`
+- Installs **Caddy** `live-edge.service` so **`http://live.local`** (port 80) reverse-proxies to the control plane (same as hub)
 - Generates the hardware profile for adaptive ARM or X86 defaults
 
+### `http://live.local` returns 502
+
+502 means the edge proxy reached nothing usable on the upstream port (default `127.0.0.1:8001`).
+
+1. Check the control plane: `sudo systemctl status live-console.service` and `journalctl -u live-console.service -n 80 --no-pager`.
+2. Check the edge: `sudo systemctl status live-edge.service` and confirm `config/system-stack.env` **`PORT`** matches what Caddy uses (regenerate with `sudo bash scripts/linux/reinstall_live_edge.sh` from the repo root).
+3. Quick probe: `curl -sf http://127.0.0.1:8001/health` — if this fails, fix `live-console` first (Python venv, `web-console/out`, or `scripts/launch.py` errors in the journal).
+
+**Older business installs** (before `install_live_edge_proxy` was included) never installed Caddy; if you still see 502 on port 80, you likely had a prior hub/edge install—run `sudo bash scripts/linux/reinstall_live_edge.sh` after pulling the latest repo.
+
 ### PM2：单频道与多频道 Pro（Linux ARM / x86_64）
 
 - **单频道**：在项目根启用一个业务进程即可，例如取消注释 `ecosystem.config.cjs` 里的 `youtube` 或 `tiktok`，执行 `pm2 start ecosystem.config.cjs && pm2 save`。