based on https://gist.github.com/efeldhusen/4bea2031525203b1658b444f4709c12c

prepare CentOS7 for elastic

#!/bin/bash
#Paths are for Centos 7.x
# Install optional packages


yum check-update
yum clean all
yum update -y
yum install -y bash-completion htop yum-utils 
yum install sudo -y
yum install nano -y

yum install qemu-guest-agent.x86_64 -y
systemctl status qemu-guest-agent

#stop logging services
/sbin/service rsyslog stop
/sbin/service auditd stop
#remove old kernels
/usr/bin/package-cleanup --oldkernels --count=1
#clean yum cache
/usr/bin/yum clean all
#force logrotate to shrink logspace and remove old logs as well as truncate logs
/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
/bin/cat /dev/null > /var/log/audit/audit.log
/bin/cat /dev/null > /var/log/wtmp
/bin/cat /dev/null > /var/log/lastlog
/bin/cat /dev/null > /var/log/grubby
#remove udev hardware rules
/bin/rm -f /etc/udev/rules.d/70*
#remove uuid from ifcfg scripts
/bin/sed -i '/^(HWADDR|UUID)=/d' /etc/sysconfig/network-scripts/ifcfg-ent0
#remove SSH host keys
/bin/rm -f /etc/ssh/*key*
#remove root users shell history
/bin/rm -f ~root/.bash_history
unset HISTFILE
#remove root users SSH history
/bin/rm -rf ~root/.ssh/
poweroff