Install GNOME and VNC Server on CentOS
Linux servers are based on a command-line interface by default, however, some might want to use them with a visual interface. In these cases, we can install an application which provides a GUI (i.e. Graphical User Interface). One of such applications is named GNOME and you can follow the steps outlined below to get it on your machine.
Please note: our Linux server is running Centos 7 and the following codes might vary for other distributions.
At first, we should update the CentOS:
Yum update -y
After completion, install Gnome with the following command:
sudo yum groupinstall -y "GNOME Desktop"
Please note: to install this package, you must have at least 2.2Gb of free space.
Now, reboot server after the installation is complete.
Install VNC server to have remote access to the server:
sudo yum install -y tigervnc-server
Now, we want to configure the VNC server for the client. In this case, we should copy the generic VNC service unit file under /etc/system/system.
sudo cp /lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@:4.service
Please note: to make multiple connections with multiple clients, you should define users and make a copy of the file for each user. Also, you should change the port of each user. We defined port 5904 for our user with vncserver@:4.service in the previous command.
Open the copied file to change the configuration with vi command.
sudo vi /etc/systemd/system/vncserver@:4.service
go to [service] section and replace username and screen resolution with default values:
Type=forking# Clean any existing files in /tmp/.X11-unix environmentExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'ExecStart=/sbin/runuser -l root -c "/usr/bin/vncserver %i -geometry 1280x1024" PIDFile=/home/root/.vnc/%H%i.pid
Then save the file and exit. Run the following command to reload daemon and the user will be enabled during boot time.
sudo systemctl daemon-reloadsudo systemctl enable vncserver@:4.service
Now we should add the ports to the firewall.
sudo firewall-cmd --permanent --zone=public --add-port=5904/tcp
Then, reload the firewall:
sudo firewall-cmd --reload
In this step, we should start the VNC server. Run below command and set a password to the VNC server.
The output should look something like this:
You will require a password to access your desktops.
Now restart the VNC server and reload the services:
vncserversudo systemctl daemon-reloadsudo systemctl restart vncserver@:4.service
Open VNC viewer from your PC and type the server IP followed by port and click on Connect.
Enter the password we set previously:
You should now be able to see the welcome screen: