wireguard watchdog script

wg-watchdog

#!/bin/bash

# 1. Save file to system /usr/bin
# 2. Make it executable
# 3. Add crontab entry:
#    sudo su
#    crontab -e
#    Add `* * * * * /usr/bin/wg-watchdog`
#
# You can track history via `journalctl -f -t wg-watchdog`

tries=0
while [[ $tries -lt 3 ]]
do
  # Ping wireguard vpn gateway
  if /bin/ping -c 1 10.254.0.1
  then
    # Notify that we are online
    logger -i -t "wg-watchdog" -p user.notice "wireguard online"
    exit 0
  fi
  
  # Notify that we are offline
  logger -i -t "wg-watchdog" -p user.notice "wireguard offline"
  tries=$((tries+1))
done

# Restart service to reconnect
sudo systemctl restart wg-quick@wg0
logger -i -t "wg-watchdog" -p user.notice "wireguard restarted"