Add the script to disable DNS on Ubuntu

disable-dns-service/README.md

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+## Why?
+
+This is a handy script to disable and stop systemd-resolved service.
+
+## How to use?
+
+```bash
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/bigbeartechworld/big-bear-scripts/master/disable-dns-service/disable_dns_service.sh)"
+```
+
+## How to troubleshoot?
+
+Check and see if port 53 is taken:
+
+```bash
+lsof -i :53
+```
+
+OR
+
+```bash
+netstat -tulpn | grep ":53 "
+```
+
+Disable and stop the systemd-resolved service:
+
+```bash
+sudo systemctl disable systemd-resolved.service
+```
+
+```bash
+sudo systemctl stop systemd-resolved.service
+```

disable-dns-service/disable_dns_service.sh

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+#!/bin/bash
+
+# Check for root privileges
+if [[ $EUID -ne 0 ]]; then
+    echo "This script must be run as root."
+    exit 1
+fi
+
+# Display open files using lsof or netstat
+echo "List of processes with port 53 open:"
+lsof -i :53 || netstat -tulpn | grep ":53 "
+
+# Disable and stop systemd-resolved service
+echo "Disabling and stopping systemd-resolved service..."
+systemctl disable systemd-resolved.service
+systemctl stop systemd-resolved.service
+
+echo "Systemd-resolved service disabled and stopped."