If you have performend a RHEL 7 Linux Server installation and did not include Graphical User Interface (GUI) you can do it later directly from command line using yum command and selecting an appropriate installation group. To list all available installation groups on Redhat 7 Linux use:

# yum group list

From the above list select Server with GUI installation group:

# yum groupinstall 'Server with GUI'

Just because gnome desktop environment is a default GUI on RHEL 7 linux system the above command will install gnome. Alternatively, you can run the below command to only install core GNOME packages:

# yum groupinstall 'X Window System' 'GNOME'

Once the installation is finished, you need to change system's runlevel to runlevel 5. Changing runlevel on RHEL 7 is done by use of systemctl command. The below command will change runlevel from runlevel 3 to runelevel 5 on RHEL 7:

# systemctl enable graphical.target --force

Depending on your previous installations you may need to accept Redhat License after you reboot your system. Once you boot to your system you can check GNOME version using:

# gnome-shell --version

Source: http://linuxconfig.org/install-gnome-gui-on-rhel-7-linux-server.



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