Prepare RHEL/CentOS 7 VM for template creation

vm_template_prep.sh

# Script created based on info from 
# https://lonesysadmin.net/2013/03/26/preparing-linux-template-vms/
#
# Prepare RHEL/CentOS 7 VM for template creation

#!/bin/bash

# Stop logging services
systemctl stop rsyslog
service auditd stop

# Remove old kernels
/bin/package-cleanup --oldkernels --count=1

# Clean out yum
/usr/bin/yum clean all
rm -rf /var/cache/yum

# Force the logs to rotate & remove old logs we don’t need
/usr/sbin/logrotate -f /etc/logrotate.conf
/bin/rm -f /var/log/*-???????? /var/log/*.gz
/bin/rm -f /var/log/dmesg.old
/bin/rm -rf /var/log/anaconda

# Truncate the audit logs
truncate -s 0 /var/log/audit/audit.log
truncate -s 0 /var/log/wtmp
truncate -s 0 /var/log/lastlog
truncate -s 0 /var/log/grubby

# Remove the udev persistent device rules
/bin/rm -f /etc/udev/rules.d/70*

# Clean /tmp
/bin/rm -rf /tmp/*
/bin/rm -rf /var/tmp/*

# Remove SSH host keys
/bin/rm -f /etc/ssh/*key*

# Remove the root user’s shell history
/bin/rm -f ~root/.bash_history
unset HISTFILE

# Remove the root user’s SSH history & other cruft
/bin/rm -rf /root/.ssh/
/bin/rm -f /root/anaconda-ks.cfg

# shutdown
init 0