889 lines
45 KiB
Bash
889 lines
45 KiB
Bash
#!/bin/bash
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# ==============================================================================================
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# ================================= System Watchdog ============================================
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# ==============================================================================================
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# Last line of defense — reboots the system cleanly if it is about to become unstable.
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# Runs continuously as a background process — started by array_start.sh at array start.
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# Works alongside docker_watchdog.sh which handles container-level healing first.
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#
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# ── THREE-TIER RESPONSE SYSTEM ────────────────────────────────────────────────────────────────
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#
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# TIER 1 — CRITICAL (bypass ALL strikes, reboot immediately)
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# Docker daemon unresponsive — nothing can be healed, letting it run makes it worse
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# rootfs at 99%+ — writes failing, SSH may stop, no recovery options
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# Kernel oops/BUG in dmesg — kernel running with corrupted state
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# File descriptor exhaustion — new connections and processes failing silently
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# /boot read-only unexpectedly — state files and config writes silently failing
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#
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# TIER 2 — URGENT (bypass strikes when OOM confirms active crisis)
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# RAM < MEM_GB AND OOM kills >= OOM_LIMIT in this cycle
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# Rationale: OOM kills at this rate means system is dying faster than watchdogs heal
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# Without OOM confirmation → standard strike system applies
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#
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# TIER 3 — STANDARD (N consecutive failures → reboot)
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# RAM tiers, load, CPU temp, zombies, /var/log, /tmp, containers, NIC, mdstat
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#
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# ── RAM TIERS ─────────────────────────────────────────────────────────────────────────────────
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# MEM_WARN_GB (10GB) — warn + notify only
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# MEM_SHUTDOWN_GB (6GB) — stop non-essential containers, wait for recovery
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# MEM_GB (4GB) — strike system → reboot (bypass if OOM confirms)
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# MEM_RECOVER_GB (30GB) — RAM must reach this before containers restart
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#
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# ── CONTAINER SHUTDOWN LOGIC ──────────────────────────────────────────────────────────────────
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# At MEM_SHUTDOWN_GB: stop all containers NOT in SYS_WATCHDOG_MEM_SHUTDOWN_EXCLUDED
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# Excluded: NginxProxyManager, Authelia, Mariadb, Redis, Emby, Dispatcharr
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# Stopped containers tracked in shutdown list — won't restart until RAM recovers
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# Strike system prevents flip-flopping — shutdown only happens once per degradation event
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#
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# ── OOM TRACKING ──────────────────────────────────────────────────────────────────────────────
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# /proc/vmstat oom_kill counter — read each cycle, delta = kills this cycle
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# Included in reboot message with process names from dmesg (diagnostic context)
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# Bypass trigger: RAM critical AND kills this cycle >= SYS_WATCHDOG_OOM_LIMIT
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#
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# ── NEW CHECKS THIS VERSION ───────────────────────────────────────────────────────────────────
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# OOM rate tracking — delta from /proc/vmstat each cycle
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# /boot read-only — write test on /boot each cycle
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# Kernel oops detection — dmesg BUG/Oops count delta each cycle
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# File descriptor exhaustion — /proc/sys/fs/file-nr utilisation
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# /tmp usage — tmpfs fill detection with auto-clear attempt
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# Array disk errors — mdstat error delta each cycle
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# Runaway process — single process >N% CPU sustained (disabled by default)
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# NIC state check — primary interface operstate
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# sshd check — restart attempt before escalating
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#
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# ── EXISTING CHECKS ───────────────────────────────────────────────────────────────────────────
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# rootfs usage, /var/log, free RAM, ZFS ARC, CPU temp, load avg,
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# zombie processes, Docker daemon, required containers from skip list
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#
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# ── ABORT CONDITIONS ──────────────────────────────────────────────────────────────────────────
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# ZFS pool unhealthy, parity running, mover running — toggleable
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# CRITICAL tier bypasses abort conditions — imminent crash overrides data safety
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#
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# ── CONFIGURATION (master.conf) ───────────────────────────────────────────────────────────────
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# Full config under System Watchdog section — see master.conf for all vars
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#
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# ── USAGE ─────────────────────────────────────────────────────────────────────────────────────
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# system_watchdog.sh — normal start (continuous loop)
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# system_watchdog.sh --dry-run — trigger detection without rebooting
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# system_watchdog.sh --status — show config and thresholds
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# system_watchdog.sh --log — verbose per-cycle output
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# ==============================================================================================
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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source "$SCRIPT_DIR/../load_config.sh"
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parse_args "$@"
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# ==============================================================================================
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# ━━━ Setup — runs once at start ━━━
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# ==============================================================================================
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if [[ "$EUID" -ne 0 ]]; then
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error "Must be run as root"
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exit 1
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fi
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validate_unraid_cmd \
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"/usr/local/emhttp/plugins/dynamix/scripts/notify" \
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"" "" \
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"unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
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acquire_lock "continuous"
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detect_hosts
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TOTAL_CORES=$(nproc)
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DOCKER_TIMEOUT=10
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# Ensure state files exist
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for state_file in "$SYS_WATCHDOG_STATE_FILE" "$SYS_WATCHDOG_REBOOT_LOG" \
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"$SYS_WATCHDOG_FAILED_FILE" "$SYS_WATCHDOG_OOM_FILE"; do
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touch "$state_file" 2>/dev/null || {
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error "Cannot create state file: $state_file"
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exit 1
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}
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done
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[[ "$DRY_RUN" == true ]] && warn "DRY RUN — no reboots or container shutdowns will occur"
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# ==============================================================================================
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# ━━━ Status ━━━
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# ==============================================================================================
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if [[ "$SHOW_STATUS" == true ]]; then
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echo ""
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echo "━━━━━ $ICON_SUMMARY SYSTEM WATCHDOG STATUS ━━━━━"
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echo "$ICON_HOST Identity: $MY_ID ($LOCAL_SERVER_NAME)"
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echo ""
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echo "── Tier 1 — CRITICAL (bypass strikes immediately) ──"
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echo "$ICON_DISK rootfs critical: ${SYS_WATCHDOG_ROOTFS_CRITICAL_PCT}%"
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echo "$ICON_GEAR FD critical: ${SYS_WATCHDOG_FD_CRITICAL_PCT}%"
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echo "$ICON_GEAR /boot read-only: check=${SYS_WATCHDOG_CHECK_BOOT}"
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echo "$ICON_GEAR Kernel oops: check=${SYS_WATCHDOG_CHECK_KERNEL_OOPS}"
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echo "$ICON_CONTAINERS Docker daemon: check=${SYS_WATCHDOG_CHECK_DOCKER_DAEMON}"
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echo ""
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echo "── Tier 2 — URGENT (bypass strikes with OOM confirmation) ──"
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echo "$ICON_MEM RAM critical: < ${SYS_WATCHDOG_MEM_GB}GB"
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echo "$ICON_GEAR OOM limit: ${SYS_WATCHDOG_OOM_LIMIT} kills/cycle"
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echo ""
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echo "── Tier 3 — STANDARD (strike system) ──"
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echo "$ICON_DISK rootfs warn: ${SYS_WATCHDOG_ROOTFS_PCT}%"
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echo "$ICON_GEAR /var/log warn: ${SYS_WATCHDOG_LOG_PCT}%"
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echo "$ICON_GEAR /tmp warn: ${SYS_WATCHDOG_TMP_PCT}%"
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echo "$ICON_MEM RAM warn: < ${SYS_WATCHDOG_MEM_WARN_GB}GB"
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echo "$ICON_MEM RAM shutdown: < ${SYS_WATCHDOG_MEM_SHUTDOWN_GB}GB"
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echo "$ICON_MEM RAM recover: > ${SYS_WATCHDOG_MEM_RECOVER_GB}GB"
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echo "$ICON_MEM RAM reboot: < ${SYS_WATCHDOG_MEM_GB}GB (+ strikes)"
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echo "$ICON_ZFS ARC pinned: ${SYS_WATCHDOG_ARC_PINNED_PCT}%"
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echo "$ICON_GEAR Load multiplier: ${SYS_WATCHDOG_LOAD_MULTIPLIER}x (= $(( TOTAL_CORES * SYS_WATCHDOG_LOAD_MULTIPLIER )) on $TOTAL_CORES cores)"
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echo "$ICON_GEAR Zombie limit: ${SYS_WATCHDOG_ZOMBIE_LIMIT}"
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echo "$ICON_GEAR CPU temp max: ${SYS_WATCHDOG_CPU_TEMP_MAX}°C"
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echo "$ICON_GEAR Strike limit: ${SYS_WATCHDOG_STRIKE_LIMIT} cycles"
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echo "$ICON_TIME Interval: ${SYSTEM_WATCHDOG_INTERVAL}s"
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echo "$ICON_REBOOT_SMART Reboot limit: ${SYS_WATCHDOG_REBOOT_LIMIT} in ${SYS_WATCHDOG_REBOOT_WINDOW_HRS}hr"
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echo ""
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echo "── Container Shutdown Excluded ──"
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for c in "${SYS_WATCHDOG_MEM_SHUTDOWN_EXCLUDED[@]:-}"; do
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echo " $ICON_RUNNING $c"
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done
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echo ""
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echo "── Check Toggles ──"
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echo " rootfs=$SYS_WATCHDOG_CHECK_ROOTFS log=$SYS_WATCHDOG_CHECK_LOG ram=$SYS_WATCHDOG_CHECK_RAM"
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echo " arc=$SYS_WATCHDOG_CHECK_ARC cpu_temp=$SYS_WATCHDOG_CHECK_CPU_TEMP load=$SYS_WATCHDOG_CHECK_LOAD"
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echo " zombies=$SYS_WATCHDOG_CHECK_ZOMBIES docker=$SYS_WATCHDOG_CHECK_DOCKER_DAEMON"
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echo " containers=$SYS_WATCHDOG_CHECK_CONTAINERS oom=$SYS_WATCHDOG_CHECK_OOM"
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echo " tmp=$SYS_WATCHDOG_CHECK_TMP fd=$SYS_WATCHDOG_CHECK_FD boot=$SYS_WATCHDOG_CHECK_BOOT"
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echo " kernel_oops=$SYS_WATCHDOG_CHECK_KERNEL_OOPS sshd=$SYS_WATCHDOG_CHECK_SSHD"
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echo " network=$SYS_WATCHDOG_CHECK_NETWORK mdstat=$SYS_WATCHDOG_CHECK_MDSTAT"
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echo " runaway=$SYS_WATCHDOG_CHECK_RUNAWAY"
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echo "━━━━━━━━━━━━━━━━━━━━━━━"
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exit 0
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fi
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# ==============================================================================================
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# ── STATE HELPERS ─────────────────────────────────────────────────────────────────────────────
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# ==============================================================================================
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get_strikes() {
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grep -E "^${1}:" "$SYS_WATCHDOG_STATE_FILE" 2>/dev/null | cut -d':' -f2
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}
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set_strikes() {
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local key="$1" count="$2"
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grep -vE "^${key}:" "$SYS_WATCHDOG_STATE_FILE" 2>/dev/null > "${SYS_WATCHDOG_STATE_FILE}.tmp"
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echo "${key}:${count}" >> "${SYS_WATCHDOG_STATE_FILE}.tmp"
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mv "${SYS_WATCHDOG_STATE_FILE}.tmp" "$SYS_WATCHDOG_STATE_FILE"
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}
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increment_strikes() {
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local key="$1"
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local current
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current=$(get_strikes "$key")
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[[ -z "$current" ]] && current=0
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(( current++ ))
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set_strikes "$key" "$current"
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echo "$current"
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}
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reset_strikes() {
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set_strikes "$1" 0
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}
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get_state_val() {
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grep -E "^${1}=" "$SYS_WATCHDOG_STATE_FILE" 2>/dev/null | cut -d'=' -f2
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}
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set_state_val() {
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local key="$1" val="$2"
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grep -vE "^${key}=" "$SYS_WATCHDOG_STATE_FILE" 2>/dev/null > "${SYS_WATCHDOG_STATE_FILE}.tmp"
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echo "${key}=${val}" >> "${SYS_WATCHDOG_STATE_FILE}.tmp"
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mv "${SYS_WATCHDOG_STATE_FILE}.tmp" "$SYS_WATCHDOG_STATE_FILE"
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}
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purge_old_reboots() {
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local now cutoff
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now=$(date +%s)
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cutoff=$(( now - SYS_WATCHDOG_REBOOT_WINDOW ))
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grep -v "^$" "$SYS_WATCHDOG_REBOOT_LOG" 2>/dev/null | while IFS= read -r ts; do
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[[ "$ts" -gt "$cutoff" ]] && echo "$ts"
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done > "${SYS_WATCHDOG_REBOOT_LOG}.tmp"
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mv "${SYS_WATCHDOG_REBOOT_LOG}.tmp" "$SYS_WATCHDOG_REBOOT_LOG"
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}
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count_recent_reboots() {
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purge_old_reboots
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grep -c "." "$SYS_WATCHDOG_REBOOT_LOG" 2>/dev/null || echo 0
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}
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log_reboot() {
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date +%s >> "$SYS_WATCHDOG_REBOOT_LOG"
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}
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# ==============================================================================================
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# ── OOM TRACKING ──────────────────────────────────────────────────────────────────────────────
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# ==============================================================================================
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# Reads /proc/vmstat oom_kill counter — delta per cycle = rate of OOM kills
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# Used for Tier 2 bypass and diagnostic context in reboot messages
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get_oom_delta() {
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local current_oom
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current_oom=$(grep "^oom_kill " /proc/vmstat 2>/dev/null | awk '{print $2}')
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[[ -z "$current_oom" ]] && echo 0 && return
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local prev_oom
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prev_oom=$(cat "$SYS_WATCHDOG_OOM_FILE" 2>/dev/null || echo 0)
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echo "$current_oom" > "$SYS_WATCHDOG_OOM_FILE"
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local delta=$(( current_oom - prev_oom ))
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[[ "$delta" -lt 0 ]] && delta=0 # counter reset on reboot
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echo "$delta"
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}
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get_oom_victims() {
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# Get process names from dmesg that were OOM killed this boot
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dmesg -T 2>/dev/null | grep -i "Killed process" | \
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awk '{print $NF}' | sort | uniq -c | sort -rn | head -5 | \
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awk '{printf "%s×%d ", $2, $1}' | sed 's/ $//'
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}
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# ==============================================================================================
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# ── ABORT CONDITIONS ──────────────────────────────────────────────────────────────────────────
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# ==============================================================================================
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# Returns 1 if reboot should be aborted, 0 if reboot should proceed
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# CRITICAL tier bypasses this function entirely
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check_abort_conditions() {
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local should_abort=false
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if command -v zpool >/dev/null 2>&1; then
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local unhealthy
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unhealthy=$(zpool list -H -o health 2>/dev/null | grep -v ONLINE || true)
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if [[ -n "$unhealthy" ]]; then
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if [[ "$SYS_WATCHDOG_ABORT_ON_ZFS_UNHEALTHY" == true ]]; then
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error "ZFS pool unhealthy — aborting reboot to prevent data loss"
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notify "System watchdog aborted reboot on $(hostname) ($MY_ID) — ZFS pool unhealthy" \
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"System Watchdog" "warning"
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should_abort=true
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else
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warn "ZFS pool unhealthy — continuing reboot (ABORT_ON_ZFS_UNHEALTHY=false)"
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fi
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fi
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fi
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if grep -q "progress" /var/local/emhttp/parity-date.txt 2>/dev/null; then
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if [[ "$SYS_WATCHDOG_ABORT_ON_PARITY" == true ]]; then
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error "Parity check running — aborting reboot"
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notify "System watchdog aborted reboot on $(hostname) ($MY_ID) — parity running" \
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"System Watchdog" "warning"
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should_abort=true
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else
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warn "Parity check running — continuing reboot (ABORT_ON_PARITY=false)"
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fi
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fi
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if pgrep -f "mover" >/dev/null 2>&1; then
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if [[ "$SYS_WATCHDOG_ABORT_ON_MOVER" == true ]]; then
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error "Mover running — aborting reboot"
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notify "System watchdog aborted reboot on $(hostname) ($MY_ID) — mover running" \
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"System Watchdog" "warning"
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should_abort=true
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else
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warn "Mover running — continuing reboot (ABORT_ON_MOVER=false)"
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fi
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fi
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[[ "$should_abort" == true ]] && return 1
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return 0
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}
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# ==============================================================================================
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# ── STANDARD STRIKE CHECK ─────────────────────────────────────────────────────────────────────
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# ==============================================================================================
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# Returns 0 = reboot now | 1 = not yet
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run_strike_check() {
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local key="$1" triggered="$2" description="$3"
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if [[ "$triggered" == true ]]; then
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local strikes
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strikes=$(increment_strikes "$key")
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warn "$description — strike $strikes/$SYS_WATCHDOG_STRIKE_LIMIT"
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if (( strikes >= SYS_WATCHDOG_STRIKE_LIMIT )); then
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error "$description — strike limit hit, reboot triggered"
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reset_strikes "$key"
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return 0
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fi
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else
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local current
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current=$(get_strikes "$key")
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[[ -n "$current" && "$current" -gt 0 ]] && reset_strikes "$key"
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fi
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return 1
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}
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# ==============================================================================================
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# ── CONTAINER SHUTDOWN (RAM EMERGENCY) ────────────────────────────────────────────────────────
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# ==============================================================================================
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shutdown_non_essential_containers() {
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warn "RAM emergency — stopping non-essential containers"
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local stopped=()
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# Build exclusion map
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declare -A EXCLUDED_MAP
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for exc in "${SYS_WATCHDOG_MEM_SHUTDOWN_EXCLUDED[@]:-}"; do
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[[ -n "$exc" ]] && EXCLUDED_MAP["$exc"]=1
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done
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# Stop all running containers not in exclusion list
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while IFS= read -r container; do
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[[ -z "$container" ]] && continue
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if [[ -n "${EXCLUDED_MAP[$container]:-}" ]]; then
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log "$container — excluded from RAM shutdown, leaving running"
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continue
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fi
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if [[ "$DRY_RUN" == false ]]; then
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timeout "$DOCKER_TIMEOUT" docker stop "$container" >/dev/null 2>&1 && \
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warn "Stopped $container (RAM emergency)" && \
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stopped+=("$container") || \
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error "Failed to stop $container"
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else
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warn "DRY RUN — would stop $container (RAM emergency)"
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stopped+=("$container")
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fi
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done < <(timeout "$DOCKER_TIMEOUT" docker ps --format "{{.Names}}" 2>/dev/null)
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if [[ ${#stopped[@]} -gt 0 ]]; then
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set_state_val "mem_shutdown_active" "true"
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notify "RAM emergency on $(hostname) ($MY_ID) — stopped ${#stopped[@]} containers. Excluded: ${SYS_WATCHDOG_MEM_SHUTDOWN_EXCLUDED[*]}" \
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"System Watchdog" "warning"
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warn "Stopped ${#stopped[@]} containers — waiting for RAM to recover above ${SYS_WATCHDOG_MEM_RECOVER_GB}GB"
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fi
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}
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restart_non_essential_containers() {
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warn "RAM recovered — restarting containers that were stopped in emergency"
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if [[ "$DRY_RUN" == false ]]; then
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set_state_val "mem_shutdown_active" "false"
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fi
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# docker_watchdog.sh will detect stopped required containers and restart them
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# We just clear the state flag here
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warn "Cleared RAM emergency state — docker_watchdog.sh will restart required containers"
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}
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# ==============================================================================================
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# ── DO REBOOT ─────────────────────────────────────────────────────────────────────────────────
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# ==============================================================================================
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# tier: "critical" (bypass abort) | "urgent" | "standard"
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do_reboot() {
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local tier="${1:-standard}"
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shift
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local triggers=("$@")
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# Get OOM context for reboot message
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local oom_victims=""
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if [[ "$SYS_WATCHDOG_CHECK_OOM" == true ]]; then
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oom_victims=$(get_oom_victims)
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[[ -n "$oom_victims" ]] && triggers+=("oom_victims: $oom_victims")
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fi
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# Abort check — CRITICAL bypasses this
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if [[ "$tier" != "critical" ]]; then
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if ! check_abort_conditions; then
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return
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fi
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else
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warn "CRITICAL tier — bypassing abort conditions"
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fi
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RECENT_REBOOTS=$(count_recent_reboots)
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log "Recent reboots in ${SYS_WATCHDOG_REBOOT_WINDOW_HRS}hr window: $RECENT_REBOOTS / $SYS_WATCHDOG_REBOOT_LIMIT"
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if [[ "$RECENT_REBOOTS" -ge "$SYS_WATCHDOG_REBOOT_LIMIT" ]]; then
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error "Reboot loop detected — shutting down instead of rebooting"
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notify "Reboot loop on $(hostname) ($MY_ID) — shutting down after $RECENT_REBOOTS reboots — ${triggers[*]}" \
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"System Watchdog" "warning"
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if [[ "$DRY_RUN" == true ]]; then
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warn "DRY RUN — would shutdown now"
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return
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fi
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sync
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/sbin/poweroff
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return
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fi
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echo ""
|
||
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
|
||
echo " $ICON_REBOOT_SMART SYSTEM WATCHDOG — REBOOT TRIGGERED"
|
||
echo " Tier: ${tier^^}"
|
||
echo " Host: $MY_ID ($LOCAL_SERVER_NAME)"
|
||
for t in "${triggers[@]}"; do
|
||
echo " → $t"
|
||
done
|
||
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
|
||
|
||
notify "System watchdog ${tier^^} reboot on $(hostname) ($MY_ID) — ${triggers[*]}" \
|
||
"System Watchdog" "warning"
|
||
|
||
if [[ "$DRY_RUN" == true ]]; then
|
||
warn "DRY RUN — reboot sequence would begin now"
|
||
return
|
||
fi
|
||
|
||
log_reboot
|
||
|
||
# Graceful shutdown sequence
|
||
warn "Shutting down VMs..."
|
||
if command -v virsh >/dev/null 2>&1; then
|
||
for VM in $(virsh list --name 2>/dev/null); do
|
||
[[ -z "$VM" ]] && continue
|
||
virsh shutdown "$VM" >/dev/null 2>&1
|
||
done
|
||
sleep 30
|
||
fi
|
||
|
||
warn "Stopping Docker containers..."
|
||
if command -v docker >/dev/null 2>&1; then
|
||
timeout 60 docker ps -q 2>/dev/null | xargs -r docker stop >/dev/null 2>&1
|
||
fi
|
||
|
||
warn "Stopping User Scripts..."
|
||
pkill -f "/tmp/user.scripts" 2>/dev/null || true
|
||
|
||
warn "Syncing disks..."
|
||
sync
|
||
|
||
sleep 5
|
||
/sbin/reboot
|
||
}
|
||
|
||
# ==============================================================================================
|
||
# ━━━ Clean Shutdown ━━━
|
||
# ==============================================================================================
|
||
WATCHDOG_RUNNING=true
|
||
|
||
cleanup() {
|
||
echo ""
|
||
warn "System watchdog received shutdown signal — stopping cleanly"
|
||
WATCHDOG_RUNNING=false
|
||
exit 0
|
||
}
|
||
|
||
trap cleanup SIGTERM SIGINT
|
||
|
||
# ==============================================================================================
|
||
# ━━━ Continuous Monitoring Loop ━━━
|
||
# ==============================================================================================
|
||
warn "System watchdog started — $MY_ID — checking every ${SYSTEM_WATCHDOG_INTERVAL}s"
|
||
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
|
||
|
||
CYCLE=0
|
||
|
||
while [[ "$WATCHDOG_RUNNING" == true ]]; do
|
||
(( CYCLE++ ))
|
||
|
||
# Re-source config each cycle — picks up config changes without restart
|
||
source "$SCRIPT_DIR/../load_config.sh"
|
||
detect_hosts
|
||
SYS_WATCHDOG_REBOOT_WINDOW=$(( SYS_WATCHDOG_REBOOT_WINDOW_HRS * 3600 ))
|
||
TOTAL_CORES=$(nproc)
|
||
|
||
TRIGGERS=()
|
||
CRITICAL_TRIGGERS=()
|
||
URGENT_OOM_CONFIRMED=false
|
||
|
||
# ── OOM Delta — read every cycle for bypass decisions ─────────────────────────────────────
|
||
OOM_DELTA=0
|
||
if [[ "$SYS_WATCHDOG_CHECK_OOM" == true ]]; then
|
||
OOM_DELTA=$(get_oom_delta)
|
||
[[ "$OOM_DELTA" -gt 0 ]] && \
|
||
log "OOM kills this cycle: $OOM_DELTA (limit: ${SYS_WATCHDOG_OOM_LIMIT})"
|
||
fi
|
||
|
||
# ==========================================================================================
|
||
# ━━━ TIER 1 — CRITICAL CHECKS (bypass all strikes, reboot immediately) ━━━
|
||
# ==========================================================================================
|
||
|
||
# ── Docker daemon — critical: nothing can heal without it ─────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_DOCKER_DAEMON" == true ]]; then
|
||
if ! timeout "$DOCKER_TIMEOUT" docker info >/dev/null 2>&1; then
|
||
error "Docker daemon unresponsive — CRITICAL"
|
||
|
||
# Attempt daemon restart before rebooting
|
||
warn "Attempting Docker daemon restart..."
|
||
if [[ "$DRY_RUN" == false ]]; then
|
||
/etc/rc.d/rc.docker restart >/dev/null 2>&1
|
||
sleep 15
|
||
if timeout "$DOCKER_TIMEOUT" docker info >/dev/null 2>&1; then
|
||
warn "Docker daemon restarted successfully — continuing monitoring"
|
||
else
|
||
error "Docker daemon restart failed — adding to CRITICAL triggers"
|
||
CRITICAL_TRIGGERS+=("docker_daemon_unresponsive")
|
||
fi
|
||
else
|
||
warn "DRY RUN — would attempt Docker daemon restart"
|
||
CRITICAL_TRIGGERS+=("docker_daemon_unresponsive")
|
||
fi
|
||
else
|
||
log "Docker daemon healthy ✅"
|
||
fi
|
||
fi
|
||
|
||
# ── rootfs critical — at 99%+ writes are failing ─────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_ROOTFS" == true ]]; then
|
||
ROOTFS_USED=$(df / --output=pcent 2>/dev/null | tail -1 | tr -d ' %')
|
||
if [[ "$ROOTFS_USED" -ge "${SYS_WATCHDOG_ROOTFS_CRITICAL_PCT:-99}" ]]; then
|
||
error "rootfs ${ROOTFS_USED}% — CRITICAL (writes failing)"
|
||
CRITICAL_TRIGGERS+=("rootfs_full=${ROOTFS_USED}%")
|
||
fi
|
||
fi
|
||
|
||
# ── Kernel oops/BUG — kernel running with corrupted state ────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_KERNEL_OOPS" == true ]]; then
|
||
PREV_OOPS=$(get_state_val "kernel_oops_count")
|
||
CURRENT_OOPS=$(dmesg 2>/dev/null | grep -cE "BUG:|kernel BUG|Oops:" || echo 0)
|
||
CURRENT_OOPS="${CURRENT_OOPS//[^0-9]/}"; CURRENT_OOPS="${CURRENT_OOPS:-0}"
|
||
set_state_val "kernel_oops_count" "$CURRENT_OOPS"
|
||
|
||
if [[ -n "$PREV_OOPS" && "$PREV_OOPS" =~ ^[0-9]+$ ]]; then
|
||
OOPS_DELTA=$(( CURRENT_OOPS - PREV_OOPS ))
|
||
if [[ "$OOPS_DELTA" -gt 0 ]]; then
|
||
error "Kernel oops/BUG detected — $OOPS_DELTA new since last cycle — CRITICAL"
|
||
CRITICAL_TRIGGERS+=("kernel_oops=${OOPS_DELTA}_new")
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
# ── File descriptor exhaustion — new connections failing silently ─────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_FD" == true ]]; then
|
||
FD_LINE=$(cat /proc/sys/fs/file-nr 2>/dev/null)
|
||
FD_OPEN=$(echo "$FD_LINE" | awk '{print $1}')
|
||
FD_MAX=$(echo "$FD_LINE" | awk '{print $3}')
|
||
if [[ -n "$FD_OPEN" && -n "$FD_MAX" && "$FD_MAX" -gt 0 ]]; then
|
||
FD_PCT=$(( FD_OPEN * 100 / FD_MAX ))
|
||
if [[ "$FD_PCT" -ge "${SYS_WATCHDOG_FD_CRITICAL_PCT:-95}" ]]; then
|
||
error "File descriptors ${FD_PCT}% exhausted (${FD_OPEN}/${FD_MAX}) — CRITICAL"
|
||
CRITICAL_TRIGGERS+=("fd_exhaustion=${FD_PCT}%")
|
||
else
|
||
log "File descriptors: ${FD_PCT}% (${FD_OPEN}/${FD_MAX})"
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
# ── /boot read-only — state and config writes failing silently ────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_BOOT" == true ]]; then
|
||
BOOT_TEST="/boot/.watchdog_write_test"
|
||
if ! touch "$BOOT_TEST" 2>/dev/null; then
|
||
error "/boot is read-only — config writes failing silently — CRITICAL"
|
||
CRITICAL_TRIGGERS+=("boot_read_only")
|
||
else
|
||
rm -f "$BOOT_TEST" 2>/dev/null
|
||
log "/boot is writable ✅"
|
||
fi
|
||
fi
|
||
|
||
# ── Act on CRITICAL triggers immediately ─────────────────────────────────────────────────
|
||
if [[ ${#CRITICAL_TRIGGERS[@]} -gt 0 ]]; then
|
||
echo ""
|
||
echo "━━━ $ICON_ERROR CRITICAL — IMMEDIATE REBOOT — Cycle $CYCLE ━━━"
|
||
for t in "${CRITICAL_TRIGGERS[@]}"; do
|
||
error " CRITICAL: $t"
|
||
done
|
||
do_reboot "critical" "${CRITICAL_TRIGGERS[@]}"
|
||
continue
|
||
fi
|
||
|
||
# ==========================================================================================
|
||
# ━━━ TIER 3 — STANDARD CHECKS (strike system) ━━━
|
||
# ==========================================================================================
|
||
|
||
# ── rootfs standard ──────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_ROOTFS" == true ]]; then
|
||
ROOTFS_USED=$(df / --output=pcent 2>/dev/null | tail -1 | tr -d ' %')
|
||
TRIGGERED=false
|
||
[[ "$ROOTFS_USED" -ge "$SYS_WATCHDOG_ROOTFS_PCT" ]] && TRIGGERED=true
|
||
run_strike_check "rootfs" "$TRIGGERED" "rootfs ${ROOTFS_USED}%" && \
|
||
TRIGGERS+=("rootfs=${ROOTFS_USED}%")
|
||
fi
|
||
|
||
# ── /var/log ─────────────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_LOG" == true ]]; then
|
||
LOG_USED=$(df -P /var/log 2>/dev/null | awk 'NR==2 {print $5}' | tr -d '%')
|
||
TRIGGERED=false
|
||
[[ "${LOG_USED:-0}" -ge "$SYS_WATCHDOG_LOG_PCT" ]] && TRIGGERED=true
|
||
run_strike_check "log" "$TRIGGERED" "/var/log ${LOG_USED}%" && \
|
||
TRIGGERS+=("log=${LOG_USED}%")
|
||
fi
|
||
|
||
# ── /tmp ─────────────────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_TMP" == true ]]; then
|
||
TMP_USED=$(df -P /tmp 2>/dev/null | awk 'NR==2 {print $5}' | tr -d '%')
|
||
if [[ "${TMP_USED:-0}" -ge "${SYS_WATCHDOG_TMP_CRITICAL_PCT:-98}" ]]; then
|
||
# Try to clear before escalating
|
||
warn "/tmp ${TMP_USED}% — attempting cleanup..."
|
||
find /tmp -type f -mmin +60 -not -name "*.lock" -delete 2>/dev/null
|
||
TMP_USED_AFTER=$(df -P /tmp 2>/dev/null | awk 'NR==2 {print $5}' | tr -d '%')
|
||
if [[ "${TMP_USED_AFTER:-0}" -ge "${SYS_WATCHDOG_TMP_CRITICAL_PCT:-98}" ]]; then
|
||
error "/tmp still ${TMP_USED_AFTER}% after cleanup — adding to triggers"
|
||
TRIGGERED=true
|
||
else
|
||
warn "/tmp cleared to ${TMP_USED_AFTER}% ✅"
|
||
TRIGGERED=false
|
||
fi
|
||
elif [[ "${TMP_USED:-0}" -ge "${SYS_WATCHDOG_TMP_PCT:-90}" ]]; then
|
||
TRIGGERED=true
|
||
else
|
||
TRIGGERED=false
|
||
fi
|
||
run_strike_check "tmp" "$TRIGGERED" "/tmp ${TMP_USED}%" && \
|
||
TRIGGERS+=("tmp=${TMP_USED}%")
|
||
fi
|
||
|
||
# ── RAM tiers ─────────────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_RAM" == true ]]; then
|
||
MEM_KB=$(awk '/MemAvailable/ {print $2}' /proc/meminfo)
|
||
MEM_GB=$(( MEM_KB / 1024 / 1024 ))
|
||
MEM_SHUTDOWN_ACTIVE=$(get_state_val "mem_shutdown_active")
|
||
|
||
if [[ "$MEM_GB" -lt "$SYS_WATCHDOG_MEM_GB" ]]; then
|
||
# Tier 2 check — bypass if OOM confirms crisis
|
||
if [[ "$SYS_WATCHDOG_CHECK_OOM" == true ]] && \
|
||
[[ "$OOM_DELTA" -ge "$SYS_WATCHDOG_OOM_LIMIT" ]]; then
|
||
error "RAM ${MEM_GB}GB + ${OOM_DELTA} OOM kills this cycle — URGENT bypass"
|
||
OOM_VICTIMS=$(get_oom_victims)
|
||
URGENT_TRIGGERS=("urgent_low_ram=${MEM_GB}GB" "oom_kills=${OOM_DELTA}")
|
||
[[ -n "$OOM_VICTIMS" ]] && URGENT_TRIGGERS+=("oom_victims: $OOM_VICTIMS")
|
||
do_reboot "urgent" "${URGENT_TRIGGERS[@]}"
|
||
continue
|
||
fi
|
||
# Standard strike path
|
||
run_strike_check "ram" true "RAM ${MEM_GB}GB free" && \
|
||
TRIGGERS+=("low_ram=${MEM_GB}GB")
|
||
|
||
elif [[ "$MEM_GB" -lt "$SYS_WATCHDOG_MEM_SHUTDOWN_GB" ]]; then
|
||
reset_strikes "ram"
|
||
# Container shutdown tier — but only once per event
|
||
if [[ "$MEM_SHUTDOWN_ACTIVE" != "true" ]]; then
|
||
warn "RAM ${MEM_GB}GB — below shutdown threshold ${SYS_WATCHDOG_MEM_SHUTDOWN_GB}GB"
|
||
run_strike_check "ram_shutdown" true "RAM shutdown tier ${MEM_GB}GB" && \
|
||
shutdown_non_essential_containers
|
||
else
|
||
# Already shutdown — check if recovered
|
||
if [[ "$MEM_GB" -ge "$SYS_WATCHDOG_MEM_RECOVER_GB" ]]; then
|
||
warn "RAM recovered to ${MEM_GB}GB — clearing emergency state"
|
||
restart_non_essential_containers
|
||
reset_strikes "ram_shutdown"
|
||
else
|
||
warn "RAM ${MEM_GB}GB — still in emergency shutdown (recover threshold: ${SYS_WATCHDOG_MEM_RECOVER_GB}GB)"
|
||
fi
|
||
fi
|
||
|
||
elif [[ "$MEM_GB" -lt "$SYS_WATCHDOG_MEM_WARN_GB" ]]; then
|
||
reset_strikes "ram"
|
||
reset_strikes "ram_shutdown"
|
||
warn "RAM ${MEM_GB}GB — below warning threshold ${SYS_WATCHDOG_MEM_WARN_GB}GB"
|
||
local prev_ram_warn
|
||
prev_ram_warn=$(get_strikes "ram_warn_notified")
|
||
if [[ "${prev_ram_warn:-0}" -eq 0 ]]; then
|
||
notify "RAM warning on $(hostname) ($MY_ID) — ${MEM_GB}GB free (threshold: ${SYS_WATCHDOG_MEM_WARN_GB}GB)" \
|
||
"System Watchdog" "warning"
|
||
set_strikes "ram_warn_notified" 1
|
||
fi
|
||
else
|
||
reset_strikes "ram"
|
||
reset_strikes "ram_shutdown"
|
||
set_strikes "ram_warn_notified" 0
|
||
log "RAM ${MEM_GB}GB free ✅"
|
||
fi
|
||
fi
|
||
|
||
# ── ZFS ARC ──────────────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_ARC" == true ]] && [[ -f /proc/spl/kstat/zfs/arcstats ]]; then
|
||
ARC_SIZE=$(awk '/^size / {print $3}' /proc/spl/kstat/zfs/arcstats)
|
||
ARC_MAX=$(awk '/^c_max / {print $3}' /proc/spl/kstat/zfs/arcstats)
|
||
ARC_PCT=$(( ARC_SIZE * 100 / ARC_MAX ))
|
||
TRIGGERED=false
|
||
if [[ "$ARC_PCT" -ge "$SYS_WATCHDOG_ARC_PINNED_PCT" ]]; then
|
||
sync; echo 3 > /proc/sys/vm/drop_caches; sleep 5
|
||
ARC_AFTER=$(awk '/^size / {print $3}' /proc/spl/kstat/zfs/arcstats)
|
||
ARC_AFTER_PCT=$(( ARC_AFTER * 100 / ARC_MAX ))
|
||
[[ "$ARC_AFTER_PCT" -ge "$SYS_WATCHDOG_ARC_RELEASE_PCT" ]] && TRIGGERED=true
|
||
fi
|
||
run_strike_check "arc" "$TRIGGERED" "ZFS ARC pinned ${ARC_PCT}%" && \
|
||
TRIGGERS+=("arc_pinned=${ARC_PCT}%")
|
||
fi
|
||
|
||
# ── CPU temperature ───────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_CPU_TEMP" == true ]]; then
|
||
CPU_TEMP=""
|
||
if command -v sensors >/dev/null 2>&1; then
|
||
CPU_TEMP=$(sensors 2>/dev/null | \
|
||
grep -i "Package id 0\|Tctl\|CPU Temp" | \
|
||
awk '{print $NF}' | tr -d '+°C' | head -1)
|
||
fi
|
||
if [[ -n "$CPU_TEMP" ]]; then
|
||
CPU_TEMP_INT=$(printf "%.0f" "$CPU_TEMP")
|
||
TRIGGERED=false
|
||
[[ "$CPU_TEMP_INT" -ge "$SYS_WATCHDOG_CPU_TEMP_MAX" ]] && TRIGGERED=true
|
||
run_strike_check "cpu_temp" "$TRIGGERED" "CPU temp ${CPU_TEMP_INT}°C" && \
|
||
TRIGGERS+=("cpu_temp=${CPU_TEMP_INT}C")
|
||
fi
|
||
fi
|
||
|
||
# ── Load average ─────────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_LOAD" == true ]]; then
|
||
LOAD=$(awk '{print $1}' /proc/loadavg)
|
||
LOAD_INT=$(printf "%.0f" "$LOAD")
|
||
LOAD_THRESHOLD=$(( TOTAL_CORES * SYS_WATCHDOG_LOAD_MULTIPLIER ))
|
||
TRIGGERED=false
|
||
[[ "$LOAD_INT" -ge "$LOAD_THRESHOLD" ]] && TRIGGERED=true
|
||
run_strike_check "load" "$TRIGGERED" "load avg ${LOAD}" && \
|
||
TRIGGERS+=("load=${LOAD}")
|
||
fi
|
||
|
||
# ── Zombie processes ─────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_ZOMBIES" == true ]]; then
|
||
ZOMBIE_COUNT=$(ps aux 2>/dev/null | awk '{print $8}' | grep -c "^Z$" || echo 0)
|
||
ZOMBIE_COUNT="${ZOMBIE_COUNT//[^0-9]/}"; ZOMBIE_COUNT="${ZOMBIE_COUNT:-0}"
|
||
TRIGGERED=false
|
||
[[ "$ZOMBIE_COUNT" -ge "$SYS_WATCHDOG_ZOMBIE_LIMIT" ]] && TRIGGERED=true
|
||
run_strike_check "zombies" "$TRIGGERED" "zombies ${ZOMBIE_COUNT}" && \
|
||
TRIGGERS+=("zombies=${ZOMBIE_COUNT}")
|
||
fi
|
||
|
||
# ── Array disk errors — accumulating mdstat errors ────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_MDSTAT" == true ]]; then
|
||
PREV_MD_ERRORS=$(get_state_val "mdstat_errors")
|
||
CURRENT_MD_ERRORS=$(grep -oP "(?<=\[)[^\]]*[U_][^\]]*(?=\])" \
|
||
/proc/mdstat 2>/dev/null | grep -o "_" | wc -l || echo 0)
|
||
CURRENT_MD_ERRORS="${CURRENT_MD_ERRORS//[^0-9]/}"; CURRENT_MD_ERRORS="${CURRENT_MD_ERRORS:-0}"
|
||
set_state_val "mdstat_errors" "$CURRENT_MD_ERRORS"
|
||
|
||
if [[ -n "$PREV_MD_ERRORS" && "$PREV_MD_ERRORS" =~ ^[0-9]+$ ]]; then
|
||
MD_DELTA=$(( CURRENT_MD_ERRORS - PREV_MD_ERRORS ))
|
||
if [[ "$MD_DELTA" -ge "${SYS_WATCHDOG_MDSTAT_ERROR_LIMIT:-5}" ]]; then
|
||
TRIGGERED=true
|
||
run_strike_check "mdstat" "$TRIGGERED" \
|
||
"mdstat errors +${MD_DELTA} (total: ${CURRENT_MD_ERRORS})" && \
|
||
TRIGGERS+=("mdstat_errors=+${MD_DELTA}")
|
||
else
|
||
run_strike_check "mdstat" false "mdstat" > /dev/null
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
# ── Network interface state ───────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_NETWORK" == true ]]; then
|
||
NIC="${SYS_WATCHDOG_NIC:-eth0}"
|
||
NIC_STATE=$(cat "/sys/class/net/${NIC}/operstate" 2>/dev/null || echo "unknown")
|
||
TRIGGERED=false
|
||
[[ "$NIC_STATE" != "up" ]] && TRIGGERED=true
|
||
run_strike_check "network" "$TRIGGERED" "${NIC} state: ${NIC_STATE}" && \
|
||
TRIGGERS+=("nic_down=${NIC}")
|
||
fi
|
||
|
||
# ── sshd — try restart before escalating ─────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_SSHD" == true ]]; then
|
||
if ! pgrep -x sshd >/dev/null 2>&1; then
|
||
warn "sshd not running — attempting restart..."
|
||
if [[ "$DRY_RUN" == false ]]; then
|
||
/etc/rc.d/rc.sshd start >/dev/null 2>&1
|
||
sleep 3
|
||
if pgrep -x sshd >/dev/null 2>&1; then
|
||
warn "sshd restarted successfully ✅"
|
||
reset_strikes "sshd"
|
||
notify "sshd was down on $(hostname) ($MY_ID) — restarted automatically" \
|
||
"System Watchdog" "warning"
|
||
else
|
||
error "sshd restart failed — remote access unavailable"
|
||
run_strike_check "sshd" true "sshd not running" && \
|
||
TRIGGERS+=("sshd_down")
|
||
fi
|
||
else
|
||
warn "DRY RUN — would restart sshd"
|
||
fi
|
||
else
|
||
reset_strikes "sshd"
|
||
fi
|
||
fi
|
||
|
||
# ── Runaway process ───────────────────────────────────────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_RUNAWAY" == true ]]; then
|
||
RUNAWAY_PCT="${SYS_WATCHDOG_RUNAWAY_CPU_PCT:-90}"
|
||
TOP_CPU_PCT=$(ps aux 2>/dev/null | awk 'NR>1{print $3}' | sort -rn | head -1)
|
||
TOP_CPU_INT=$(printf "%.0f" "${TOP_CPU_PCT:-0}")
|
||
TOP_CPU_NAME=$(ps aux 2>/dev/null | sort -k3 -rn | awk 'NR==2{print $11}')
|
||
TRIGGERED=false
|
||
[[ "$TOP_CPU_INT" -ge "$RUNAWAY_PCT" ]] && TRIGGERED=true
|
||
# Runaway uses SYS_WATCHDOG_RUNAWAY_STRIKES not global strike limit
|
||
if [[ "$TRIGGERED" == true ]]; then
|
||
RAWAY_S=$(increment_strikes "runaway")
|
||
RLIMIT="${SYS_WATCHDOG_RUNAWAY_STRIKES:-3}"
|
||
warn "Runaway ${TOP_CPU_NAME} ${TOP_CPU_PCT}% CPU -- strike $RAWAY_S/$RLIMIT"
|
||
if (( RAWAY_S >= RLIMIT )); then
|
||
error "Runaway process ${TOP_CPU_NAME} -- strike limit hit"
|
||
reset_strikes "runaway"
|
||
TRIGGERS+=("runaway=${TOP_CPU_NAME}@${TOP_CPU_PCT}%")
|
||
fi
|
||
else
|
||
RAWAY_CUR=$(get_strikes "runaway")
|
||
[[ "${RAWAY_CUR:-0}" -gt 0 ]] && reset_strikes "runaway"
|
||
fi
|
||
fi
|
||
|
||
# ── Required containers from docker_watchdog skip list ────────────────────────────────────
|
||
if [[ "$SYS_WATCHDOG_CHECK_CONTAINERS" == true ]] && [[ -s "$SYS_WATCHDOG_FAILED_FILE" ]]; then
|
||
FAILED_CONTAINERS=()
|
||
while IFS= read -r container; do
|
||
[[ -z "$container" ]] && continue
|
||
STATUS=$(timeout "$DOCKER_TIMEOUT" docker inspect -f \
|
||
'{{.State.Running}}' "$container" 2>/dev/null || echo "unknown")
|
||
[[ "$STATUS" != "true" ]] && FAILED_CONTAINERS+=("$container")
|
||
done < "$SYS_WATCHDOG_FAILED_FILE"
|
||
|
||
TRIGGERED=false
|
||
[[ ${#FAILED_CONTAINERS[@]} -gt 0 ]] && TRIGGERED=true
|
||
run_strike_check "failed_containers" "$TRIGGERED" \
|
||
"required containers stopped: ${FAILED_CONTAINERS[*]:-}" && \
|
||
TRIGGERS+=("containers=${FAILED_CONTAINERS[*]:-}")
|
||
fi
|
||
|
||
# ==========================================================================================
|
||
# ━━━ Evaluate Standard Triggers ━━━
|
||
# ==========================================================================================
|
||
if [[ ${#TRIGGERS[@]} -gt 0 ]]; then
|
||
echo ""
|
||
echo "━━━ $ICON_REBOOT_SMART System Watchdog — Cycle $CYCLE — $(date '+%Y-%m-%d %H:%M:%S') ━━━"
|
||
for t in "${TRIGGERS[@]}"; do
|
||
echo " $ICON_REBOOT_SMART $t"
|
||
done
|
||
[[ "$OOM_DELTA" -gt 0 ]] && echo " OOM kills this cycle: $OOM_DELTA"
|
||
echo ""
|
||
do_reboot "standard" "${TRIGGERS[@]}"
|
||
else
|
||
log "Cycle $CYCLE — system healthy ($(date '+%H:%M:%S'))"
|
||
|
||
# Heartbeat — periodic proof of life
|
||
if [[ "${SYSTEM_WATCHDOG_HEARTBEAT:-true}" == true ]]; then
|
||
HB_SECONDS=$(( ${SYSTEM_WATCHDOG_HEARTBEAT_HOURS:-1} * 3600 ))
|
||
UPTIME_APPROX=$(( CYCLE * SYSTEM_WATCHDOG_INTERVAL ))
|
||
if [[ "$HB_SECONDS" -gt 0 ]] && \
|
||
(( UPTIME_APPROX % HB_SECONDS < SYSTEM_WATCHDOG_INTERVAL )) && \
|
||
[[ "$UPTIME_APPROX" -gt 0 ]]; then
|
||
HB_HR=$(( UPTIME_APPROX / 3600 ))
|
||
warn "♥ system_watchdog alive — $MY_ID — ~${HB_HR}hr uptime ($(date '+%H:%M:%S'))"
|
||
fi
|
||
fi
|
||
fi
|
||
|
||
# ── State file heartbeat — keep mtime fresh every cycle ───────────────────────────────────
|
||
# docker_watchdog.sh uses state file mtime to detect stale RAM emergency flags.
|
||
# If all checks pass with no set_state_val calls (e.g. KERNEL_OOPS + MDSTAT both disabled),
|
||
# mtime would not update and stale guard would incorrectly resume docker_watchdog.sh.
|
||
# Writing watchdog_cycle each tick guarantees mtime stays current while watchdog runs.
|
||
set_state_val "watchdog_cycle" "$CYCLE"
|
||
|
||
# Sleep until next cycle — interruptible by SIGTERM
|
||
sleep "$SYSTEM_WATCHDOG_INTERVAL" &
|
||
wait $!
|
||
|
||
done |