Pi-hole service script, to correct time if using DNSSEC

default-dns

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1

pihole-dns.service

[Unit]
Description=Pi-hole DNS Service
After=network.target
StartLimitIntervalSec=0
[Service]
Type=simple
Restart=always
RestartSec=1
User=root
ExecStart=/usr/bin/env sh /home/pi/DNS/pihole-dns.sh

[Install]
WantedBy=multi-user.target

pihole-dns.sh

#!/bin/bash
### BEGIN INIT INFO
# Provides:          Pi-hole DNS resolution during a startup after a power failure.
# Required-Start:    $network $remote_fs $syslog
# Required-Stop:     $network $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:
# Description:       This script will install a Google DNS nameserver in /etc/resolv.conf
#                    until the Pi-hole has a chance to start working, then it will switch
#                    DNS back to localhost 127.0.0.1 so DNS resolution comes from the Pi-hole.
### END INIT INFO
# INSTALLATION
# Double check all paths are correct, mainly /pi/DNS
# sudo cp pihole-dns.service /etc/systemd/system/pihole-dns.service
# To start: sudo systemctl start pihole-dns
# To enable on startup: sudo systemctl enable pihole-dns
# To stop: sudo systemctl stop pihole-dns
# To disable on startup: sudo systemctl disable pihole-dns
# You can check /var/log/syslog for echos.
# enable more logging with DEBUGSYSLOG=1
##############

SCRIPTLOCATION='/home/pi/DNS'
ONLINE=0
DEBUGSYSLOG=0
while [ !$exit_loop ]
do
    if [ "$ONLINE" -eq 0 ]; then
        if [ "$DEBUGSYSLOG" -eq 1 ]; then
            echo "Changing back to our default Pi-hole resolver to check if internet is back on"
        fi
        cp ${SCRIPTLOCATION}/default-dns /etc/resolv.conf
    fi
    if [ "$DEBUGSYSLOG" -eq 1 ]; then
        echo "Testing Internet connection and DNS resolution is ok..."
    fi
    wget -q --spider http://google.com

    if [ $? -eq 0 ]; then
        if [ "$DEBUGSYSLOG" -eq 1 ]; then
            echo "Online"
        fi
        ONLINE=1
    else
        ONLINE=0
        echo "Offline"
        echo "Setting up Google's DNS for Startup DNS"
        cp ${SCRIPTLOCATION}/startup-dns /etc/resolv.conf
    fi
    sleep 15s
done

startup-dns

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 8.8.8.8