In this article you will learn how to install and configure VNC in Centos and RHEL
VNC (Virtual Network Computing) is a protocol which is used to remotely access user accounts by the Graphical User Interface.
Step 1: Install VNC
You need to use following command in order to install VNC. Makse sure you are login as root user.
# yum install tigervnc-server -y
Step 2: Setup VNC Password
After installation, login with the user you want to allow VNC remote access and and set VNC password for that user. I will enable VNC access to root user.
# su - user_name # vncpasswd
Step 3: VNC Configuration
Now create a VNC file for your user. I template file [email protected] placed in below mentioned path, we will use copy of that file and make configuration for VNC user.
# cp /lib/systemd/system/[email protected] /etc/systemd/system/[email protected]:1.service
Number 1 after @ sign represents the display number (port 5900+display). Secondly the port 5900 will be incremented by 1 with each started VNC server.
Now edit [email protected]:1.service file using following command.
# vi /etc/systemd/system/[email protected]\:1.service
and add the below lines in this file. Replace your_user with your username.
[Unit] Description=Remote desktop service (VNC) After=syslog.target network.target [Service] Type=forking ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :' ExecStart=/usr/sbin/runuser -l your_user -c "/usr/bin/vncserver %i PIDFile=/home/You_user/.vnc/%H%i.pid ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :' [Install] WantedBy=multi-user.target
save changes to file and quite
Step 4: Reload Necessary Daemons
After changes in file, reload systemd program to load new VNC configuration file and start the VNC server. Use following commands
# systemctl daemon-reload # systemctl start [email protected]:1 # systemctl status [email protected]:1 # systemctl enable [email protected]:1
Step 5: Add Ports in Firewall
You must add VNC open ports in firewall so VNC client can access the system.
Use below command to list listening ports of VNC server
# ss -tulpn| grep vnc
Note: If you started multiple VNC instances for different users, the port value will be 5902 for the second, 5903 for the third and so on.
Use followings commands to add ports and reload firewall.
# firewall-cmd --permanent --add-port=5901/tcp # firewall-cmd --reload
Step 6: Connect to CentOS Desktop from VNC Client
In order to access Centos desktop you need to install a VNC Client program, then run VNC Client and add the IP address and port number of CentOS VNC server and press enter button.
After that a warning will be displayed, click on continue button and enter VNC password on new screen.
Congratulations! You have access your Centos Desktop from VNC.