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sysprep-ubuntu.sh

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+#!/bin/bash
+######################################################
+#### WARNING PIPING TO BASH IS STUPID: DO NOT USE THIS
+######################################################
+# basaed on: jcppkkk/prepare-ubuntu-template.sh
+# TESTED ON UBUNTU 20.04 LTS
+
+# SETUP & RUN
+# curl -sL https://dev.ksite.de/rkirchner/sysprep-ubuntu-20.04/raw/branch/master/sysprep-ubuntu.sh | sudo -E bash -
+
+if [ `id -u` -ne 0 ]; then
+	echo Need sudo
+	exit 1
+fi
+
+set -v
+
+#update apt-cache
+apt update -y
+apt upgrade -y
+
+#install packages
+apt install -y open-vm-tools
+
+#Stop services for cleanup
+service rsyslog stop
+
+#clear audit logs
+if [ -f /var/log/wtmp ]; then
+    truncate -s0 /var/log/wtmp
+fi
+if [ -f /var/log/lastlog ]; then
+    truncate -s0 /var/log/lastlog
+fi
+
+#cleanup /tmp directories
+rm -rf /tmp/*
+rm -rf /var/tmp/*
+
+#cleanup current ssh keys
+rm -f /etc/ssh/ssh_host_*
+
+#add check for ssh keys on reboot...regenerate if neccessary
+cat << 'EOL' | sudo tee /etc/rc.local
+#!/bin/sh -e
+#
+# rc.local
+#
+# This script is executed at the end of each multiuser runlevel.
+# Make sure that the script will "" on success or any other
+# value on error.
+#
+# In order to enable or disable this script just change the execution
+# bits.
+#
+# By default this script does nothing.
+
+# dynamically create hostname (optional)
+if hostname | grep localhost; then
+    hostnamectl set-hostname "$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13 ; echo '')"
+fi
+
+test -f /etc/ssh/ssh_host_dsa_key || dpkg-reconfigure openssh-server
+exit 0
+EOL
+
+# make sure the script is executable
+chmod +x /etc/rc.local
+
+#reset hostname
+# prevent cloudconfig from preserving the original hostname
+sed -i 's/preserve_hostname: false/preserve_hostname: true/g' /etc/cloud/cloud.cfg
+truncate -s0 /etc/hostname
+hostnamectl set-hostname localhost
+
+#cleanup apt
+apt clean
+
+# disable swap
+sudo swapoff --all
+sudo sed -ri '/\sswap\s/s/^#?/#/' /etc/fstab
+
+# set dhcp to use mac - this is a little bit of a hack but I need this to be placed under the active nic settings
+# also look in /etc/netplan for other config files
+sed -i 's/optional: true/dhcp-identifier: mac/g' /etc/netplan/50-cloud-init.yaml
+
+# remove MAC from network scripts
+#/bin/sed -ri '/^(mac-address|uuid)=/d' /etc/NetworkManager/system-connections/*
+
+# cleans out all of the cloud-init cache / logs - this is mainly cleaning out networking info
+sudo cloud-init clean --logs
+
+#cleanup shell history
+cat /dev/null > ~/.bash_history && history -c
+history -w
+
+#shutdown
+shutdown -h now