Desktop Environment : Configure VNC Server

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

[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 ~]$  vncpasswd Password: Verify: Would you like to enter a view-only password (y/n)?  n [cent@dlp ~]$  vi ~/.vnc/config # create new # session=(display manager you use) # securitytypes=(security options) # geometry=(screen resolution) session=gnome securitytypes=vncauth,tlsvnc geometry=800x600

[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 :1=cent :2=redhat # start systemd unit [root@dlp ~]#  systemctl enable --now vncserver@:1 vncserver@:2

[6]

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.