Files
ergo-proxmox-scripts/vm-watchdog.sh
T
ergosteurandClaude Opus 5 927f687863 Add Proxmox VM and LXC watchdog scripts
Cron-driven liveness checks that ping each guest, restart it via qm/pct if
unreachable, and log plus email the outcome. Guest lists are configured in
the associative array at the top of each script.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-06 15:44:49 +00:00

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#!/bin/bash
#
# WatchDog script for Proxmox VMs
# v2.0
#
# Install using `crontab -e` like this: * * * * * /root/watchdog.sh
#
# Configurable Settings
declare -A VMs=(
["pfsense"]="2801 10.20.28.1"
)
logFile="/var/log/proxmox_watchdog.log"
email="alerts@example.com"
# Log function
log () {
output="[WatchDog] $(date '+%Y-%m-%d %H:%M:%S') $1"
echo "$output" >> "$logFile"
logger "$output"
}
# Send email alert
sendAlert () {
subject="[Proxmox WatchDog] $1"
body="$2"
echo -e "$body" | mail -s "$subject" "$email"
}
# Check VM function
checkVM () {
local vmName=$1
local vmId=$2
local vmIp=$3
if /usr/bin/ping -c 1 "$vmIp" &> /dev/null; then
local vmUptime
vmUptime=$(/usr/sbin/qm status "$vmId" -verbose | grep uptime | cut -f2 -d' ')
log "$vmName ($vmIp) is alive. Uptime: $vmUptime seconds."
else
log "$vmName ($vmIp) is down. Attempting restart..."
if /usr/sbin/qm stop "$vmId" && /usr/sbin/qm start "$vmId"; then
log "$vmName restarted successfully."
sendAlert "$vmName Restarted" "The VM '$vmName' was restarted by the watchdog script."
else
log "Failed to restart $vmName. Manual intervention required."
sendAlert "$vmName Restart Failed" "The VM '$vmName' failed to restart. Please check Proxmox immediately."
fi
fi
}
# Main Logic
for vmName in "${!VMs[@]}"; do
read -r vmId vmIp <<< "${VMs[$vmName]}"
checkVM "$vmName" "$vmId" "$vmIp" &
done
# Wait for all background checks to complete
wait