bato-reset-for-template

#!/bin/bash
# This script has been copied and reworkt from ranchers example:
# https://ranchermanager.docs.rancher.com/how-to-guides/new-user-guides/launch-kubernetes-with-rancher/use-new-nodes-in-an-infra-provider/vsphere/create-a-vm-template

echo "This script will reset all machine specific informations for use as a template."
echo "ARE YOU SURE YOU WANT TO DO THIS?"
echo "Waiting for 10 seconds, so you can CTRL-C to abort..."
sleep 10

echo "... Cleaning logs"
if [ -f /var/log/audit/audit.log ]; then
  cat /dev/null > /var/log/audit/audit.log
fi
if [ -f /var/log/wtmp ]; then
  cat /dev/null > /var/log/wtmp
fi
if [ -f /var/log/lastlog ]; then
  cat /dev/null > /var/log/lastlog
fi
if [ -f /var/log/secure ]; then
  cat /dev/null > /var/log/secure
fi
if [ -f /var/log/messages ]; then
  cat /dev/null > /var/log/messages
fi
if [ -f /var/log/cron ]; then
  cat /dev/null > /var/log/cron
fi

echo "... Cleaning the /tmp directories"
rm -rf /tmp/*
rm -rf /var/tmp/*

echo "... Cleaning the SSH host keys"
rm -f /etc/ssh/ssh_host_*

echo "... Cleaning the machine-id"
truncate -s 0 /etc/machine-id
rm /var/lib/dbus/machine-id
ln -s /etc/machine-id /var/lib/dbus/machine-id

echo "... Cleaning the shell history"
unset HISTFILE
history -cw
echo > ~/.bash_history
rm -fr /root/.bash_history

echo "... Truncating hostname, hosts, resolv.conf and setting hostname to localhost"
truncate -s 0 /etc/{hostname,hosts,resolv.conf}
hostnamectl set-hostname localhost