Add local watchdog (HTTP-200 probe + per-minute cron auto-restart)

9router-watchdog.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+# 9router-watchdog.sh — local health monitor + auto-restart.
+#
+# Runs from cron (e.g. every minute). Checks the 9router API endpoint;
+# if it does NOT respond with HTTP 200, the service is (re)started via
+# start-9router.sh.
+#
+# Uses absolute paths because cron has a minimal PATH.
+# Run as root (so it can drop privileges via runuser inside start-9router.sh).
+
+CURL=/usr/bin/curl
+WRAPPER=/usr/local/bin/start-9router.sh
+URL=http://127.0.0.1:20128/v1/models
+LOG=/home/ardhi/9router.log
+
+# If the wrapper is missing, nothing we can do.
+[ -x "$WRAPPER" ] || exit 0
+
+# Probe the API. -f makes curl exit non-zero on HTTP >= 400.
+if "$CURL" -fs -m 5 -o /dev/null "$URL" 2>/dev/null; then
+  # Healthy — nothing to do.
+  exit 0
+fi
+
+# Unhealthy (no response / non-200) → restart.
+echo "[$(date '+%Y-%m-%d %H:%M:%S')] watchdog: 9router not healthy, restarting" >> "$LOG" 2>/dev/null
+"$WRAPPER"
+exit 0