A simle dnsmasq status check and restart when needed because it might listen to tailscale IP.

gistfile1.txt

#!/bin/bash

logger -t "dnsmasqlivecheck" "dnsmasq live check run"

if [[ ! -f /run/dnsmasq/dnsmasq.pid ]]; then
   logger -t "dnsmasqlivecheck" "dnsmasq pid not present, restart"
   systemctl restart dnsmasq
   exit 1
fi

pid=`cat /run/dnsmasq/dnsmasq.pid`
if [[ ! -f /proc/$pid/cmdline ]]; then
   logger -t "dnsmasqlivecheck" "dnsmasq pid is stale, restart"
   systemctl restart dnsmasq
   exit 1
fi

exit 0