CentOS Stream 9
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Desktop Environment : Configure VNC Server2022/01/18

Install VNC Server to connect to CentOS Stream Server with GUI from remote client computer.
[1] Install Tigervnc Server.
[root@dlp ~]#
dnf -y install tigervnc-server
[2] If Firewalld is running, allow VNC service.
[root@dlp ~]#
firewall-cmd --add-service=vnc-server

[root@dlp ~]#
firewall-cmd --runtime-to-permanent

[3] If SELinux is enabled, change policy.
[root@dlp ~]#
vi vncsession.te
# create new

module vncsession 1.0;

require {
        type default_t;
        type xdm_home_t;
        type vnc_session_t;
        class dir { add_name create write };
        class file { create open write };

#============= vnc_session_t ==============
allow vnc_session_t default_t:dir { add_name write };
allow vnc_session_t default_t:file { create open write };
allow vnc_session_t xdm_home_t:dir create;

[root@dlp ~]#
checkmodule -m -M -o vncsession.mod vncsession.te

[root@dlp ~]#
semodule_package --outfile vncsession.pp --module vncsession.mod

[root@dlp ~]#
semodule -i vncsession.pp

[4] Configure Tigervnc with Systemd Unit like follows.
Configure VNC settings on each user first, and next, start Systemd Unit with root privilege.
# set VNC password

[cent@dlp ~]$

Would you like to enter a view-only password (y/n)?
[cent@dlp ~]$
vi ~/.vnc/config
# create new
# session=(display manager you use)
# securitytypes=(security options)
# geometry=(screen resolution)

[5] Configure settings with root privilege and start Systemd Unit.
[root@dlp ~]#
vi /etc/tigervnc/vncserver.users
# add to the end
# specify [:(display number)=(username]
# display number 1 listens port 5901
# display number n + 5900 = listening port

# This file assigns users to specific VNC display numbers.
# The syntax is <display>=<username>. E.g.:
# :2=andrew
# :3=lisa

# start systemd unit

[root@dlp ~]#
systemctl enable --now vncserver@:1 vncserver@:2
Install VNC Viewer on client computer to connect to VNC server.
This example is based on Windows 11 and UltraVNC.
Download UltraVNC from the site below.
⇒ https://www.uvnc.com/downloads/ultravnc.html
After installing UltraVNC, click [UltraVNC Viewer] to run, then, following window is shown.
Input [(Server's hostname or IP address):(display number)] like following example and then click the [Connect] button.
[7] VNC password is required to input for authentication.
[8] If successfully passed authentication, VNC session starts like follows.
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