Configuring Xrdp in Redhat (RHEL) 7 / CentOS 7

First thing is to install some type of desktop:

yum groupinstall "Gnome Desktop"

You need to install the epel repo. ****(The Next two lines may change if the version is not 7.8)****

wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-8.noarch.rpm

rpm -ivh epel-release-7-8.noarch.rpm

yum clean all
yum repolist

Next install VNC and XRDP

yum install tigervnc-server xrdp

cp /etc/pam.d/sshd /etc/pam.d/xrdp-sesman
systemctl restart xrdp
systemctl enable xrdp

cp /lib/systemd/system/vncserver\@.service /etc/systemd/system/vncserver@.service

Orginal:

[Service]
Type=forking
# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/usr/sbin/runuser -l  -c "/usr/bin/vncserver %i"
PIDFile=/home//.vnc/%H%i.pid
ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'

I used the root account for testing. Use any account you would like.
Working:

[Service]
Type=forking
# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/usr/sbin/runuser -l root -c "/usr/bin/vncserver %i -geometry 1280x1024"
PIDFile=/root/.vnc/%H%i.pid
ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'

I did the above with sed:

sed -i 's/ -c/root -c/g' /etc/systemd/system/vncserver@.service
sed -i 's/vncserver %i/vncserver %i -geometry 1280x1024/g' /etc/systemd/system/vncserver@.service
sed -i 's/\/home\//\/root/g' /etc/systemd/system/vncserver@.service

Reload the services

systemctl daemon-reload

Set the VNC Password

vncpasswd

Start the service and enable it on boot

systemctl start vncserver@:1.service
systemctl enable vncserver@:1.service