How to install GNOME GUI on CentOS 7

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Step 1. Download the latest version of CentOS from http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7.0-1406-x86_64-DVD.iso

Step 2. Install CentOS 7 as minimal server with libraries.

 Step 3. To install GNOME GUI run the following commands
              # yum groupinstall "GNOME Desktop" "Graphical Administration Tools"

 Step 4.  Run the following command to enable the GUI on system start.
             ln -sf /lib/systemd/system/runlevel5.target /etc/systemd/system/default.target

Step 5. Reboot the system and you are done with GUI installation

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