xfce-minimal on centos 7

#!/bin/bash
# Installs EPEL
# https://fedoraproject.org/wiki/EPEL
# https://getfedora.org/keys/
# EPEL7 key
# https://getfedora.org/static/352C64E5.txt
#
# This installs Xorg and Xfce on a minimal install
#
# Based on http://jensd.be/125/linux/rhel/install-mate-or-xfce-on-centos-7

if grep -q "Centos release\|CentOS release\|CentOS Linux release" "/etc/redhat-release"; then
    yum install epel-release -y
else
    yum install wget -y
    wget https://getfedora.org/static/352C64E5.txt
    rpm --import 352C64E5.txt
    rm -f 352C64E5.txt
    wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
    rpm -ivh epel-release-latest-7.noarch.rpm
fi

# Update System
yum install deltarpm -y && yum --enablerepo=updates clean metadata && yum update -y

# Install Xorg
yum groupinstall "X Window system" -y

# Install XFCE from Epel repo
# yum groupinfo "xfce" gives a list of packages installed
yum groupinstall xfce -y

# Remove gdm
yum remove gdm -y

# Remove its dependencies
yum autoremove -y

# Install lightdm instead
yum install lightdm -y

# Starting the graphical environment
systemctl isolate graphical.target

# Make the GUI start by default on reboots
systemctl set-default graphical.target
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'

# Enable lightdm
systemctl enable lightdm
systemctl isolate graphical.target