reset cloned VMs

script.sh

#!/bin/bash

# Usage: curl -sSL https://a.xn--c-kia488t.vn/clone | sudo bash -s -- pc1

if [ "$EUID" -ne 0 ]; then 
  echo "Please run as root (e.g., sudo bash script.sh)"
  exit 1
fi

NEW_HOSTNAME=$1

if [ -z "$NEW_HOSTNAME" ]; then
    echo "Usage: curl -sSL [URL] | sudo bash -s -- [new-hostname]"
    exit 1
fi

# 1. Update the hostname
hostnamectl set-hostname "$NEW_HOSTNAME"

# 2. Update /etc/hosts to prevent sudo resolution delays
sed -i "s/^127.0.1.1.*/127.0.1.1\t$NEW_HOSTNAME/" /etc/hosts

# 3. Regenerate SSH Host Keys
rm -f /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server

# 4. Reset Machine ID for unique system identification (useful for cloned VMs)
rm -f /etc/machine-id
dbus-uuidgen --ensure=/etc/machine-id

rm -rf /var/lib/dhcp/* 2>/dev/null
rm -rf /var/lib/NetworkManager/*.lease 2>/dev/null

systemctl reboot