GUI install gnome on centos yum groupinstall "GNOME Desktop" -y | systemctl set-default graphical.target

By OK -
yum group list
...
GNOME Desktop
...

yum groupinstall "GNOME Desktop" -y

[root@centos7 ~]# systemctl set-default graphical.target
Removed symlink /etc/systemd/system/default.target.
Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/graphical.target.

[root@centos7 ~]# systemctl get-default
graphical.target
to start GUI immediately:

[root@centos7 ~]# systemctl isolate graphical.target


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