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ChuckandClaude Opus 5.5
64c7289593
If the render loop gets stuck inside a plugin's display(), ledmatrix.service stays active and the panel stays frozen. This adds a way to detect that. - src/display_watchdog.py (standard library only) sends sd_notify over $NOTIFY_SOCKET and writes /run/ledmatrix/display-heartbeat.json. Only the render thread counts: beats from other threads are ignored. - ledmatrix.service: WatchdogSec=120, NotifyAccess=main, RuntimeDirectory=ledmatrix (0755), RestartSteps=4 and RestartMaxDelaySec=2min. It stays Type=simple. run.py widens the watchdog to 15 min for start-up, and load_plugin() does the same on the render thread. The loop arms after its first frame. - /api/v3/health adds checks.display_loop: running, stalled (no heartbeat for over 60s, which makes the status degraded) or not_reported. With web login on, a caller who is not logged in still gets only healthy/degraded, and a stall degrades that answer. - The update verifier requires a fresh heartbeat from the restarted display when the display it replaced was writing one. A frozen panel is rolled back. - Existing installs get the systemd watchdog only after install_service.sh is re-run. The heartbeat works right away. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
114 lines
4.4 KiB
Markdown
114 lines
4.4 KiB
Markdown
# Systemd Service Files
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This directory contains systemd service unit files for LEDMatrix services.
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## Service Files
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- **`ledmatrix.service`** - Main LED Matrix display service
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- Runs the display controller (`run.py`)
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- Starts automatically on boot
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- Runs as root for hardware access
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- Restarted by systemd's watchdog (`WatchdogSec=120`) when its render loop
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stops checking in, e.g. stuck inside a plugin; the loop writes a heartbeat
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to `/run/ledmatrix/display-heartbeat.json` (`RuntimeDirectory=`) that the
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web interface's health check reads. See `src/display_watchdog.py`
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- **`ledmatrix-web.service`** - Web interface service
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- Runs the web interface conditionally based on config
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- Starts automatically on boot if `web_display_autostart` is enabled
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- Uses `scripts/utils/start_web_conditionally.py`
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- **`ledmatrix-update-verify.service`** / **`.path`** - Automatic update health check and rollback
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- The path unit starts the service when the web interface creates
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`data/auto_update_verify.request` after a weekly automatic update
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- Installed by the installers, or by the display service when automatic
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updates are turned on in the web UI (`src/auto_update_setup.py`)
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- Restarts the services, checks they stay up, and otherwise resets to the
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previous commit and its dependencies
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- Runs `data/auto_update_verifier.py`, a copy of
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`scripts/utils/auto_update_verify.py` taken before the update
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- **`ledmatrix-wifi-monitor.service`** - WiFi monitor daemon service
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- Monitors WiFi/Ethernet connectivity
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- Automatically enables/disables access point mode
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- Uses `scripts/utils/wifi_monitor_daemon.py`
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- **`ledmatrix-dns-fix.service`** - DNS single-request fix (optional)
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- Re-applies `options single-request` to the resolver on every boot,
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because whatever manages `resolv.conf` regenerates it and drops the
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option again
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- Works around glibc's parallel A/AAAA lookup stalling ~5s per name on
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routers that answer only the A query, which makes any plugin calling an
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external API slow or (for Starlark apps, which have a render timeout)
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fail outright
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- Uses `scripts/utils/apply_dns_single_request.sh`
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- Install only if external API calls are timing out; it is not part of a
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normal install
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- **`ledmatrix-mqtt-bridge.service`** - Home Assistant MQTT bridge (optional)
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- Exposes the display to Home Assistant over MQTT Discovery: force a mode,
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stop on-demand, toggle power, set brightness
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- Uses `integrations/mqtt_bridge/ledmatrix_mqtt_bridge.py`, which drives the
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web API rather than the display directly
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- Needs `integrations/mqtt_bridge/bridge_config.json`; see that directory's
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README
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## Installation
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These service files are installed by the installation scripts in `scripts/install/`:
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- `install_service.sh` installs `ledmatrix.service`, `ledmatrix-web.service`
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and the `ledmatrix-update-verify` service and path units, then enables and
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starts them
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- `install_web_service.sh` installs only `ledmatrix-web.service` and the
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`ledmatrix-update-verify` units
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- `install_wifi_monitor.sh` installs `ledmatrix-wifi-monitor.service`
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- `install_dns_fix.sh` installs `ledmatrix-dns-fix.service` (opt-in, not run
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by the normal installer)
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- `install_mqtt_bridge.sh` installs `ledmatrix-mqtt-bridge.service` (opt-in)
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## Manual Installation
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> **Important:** the unit files in this directory contain
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> `__PROJECT_ROOT_DIR__` placeholders that the install scripts replace
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> with the actual project directory at install time. Do **not** copy
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> them directly to `/etc/systemd/system/` — the service will fail to
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> start with `WorkingDirectory=__PROJECT_ROOT_DIR__` errors.
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>
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> Always install via the helper script:
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>
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> ```bash
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> sudo ./scripts/install/install_service.sh
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> ```
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>
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> If you really need to do it by hand, substitute the placeholder
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> first:
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>
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> ```bash
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> PROJECT_ROOT="$(pwd)"
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> sed "s|__PROJECT_ROOT_DIR__|$PROJECT_ROOT|g" systemd/ledmatrix.service \
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> | sudo tee /etc/systemd/system/ledmatrix.service > /dev/null
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> sudo systemctl daemon-reload
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> sudo systemctl enable ledmatrix.service
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> sudo systemctl start ledmatrix.service
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> ```
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## Service Management
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```bash
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# Check status
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sudo systemctl status ledmatrix.service
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# Start/stop/restart
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sudo systemctl start ledmatrix.service
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sudo systemctl stop ledmatrix.service
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sudo systemctl restart ledmatrix.service
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# Enable/disable autostart
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sudo systemctl enable ledmatrix.service
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sudo systemctl disable ledmatrix.service
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# View logs
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journalctl -u ledmatrix.service -f
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```
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