Headless Linux GUI

install dummy driver

yum install xorg-x11-drv-dummy

create xorg.conf in /etc/X11

Section "Monitor"  
  Identifier "Monitor0"  
  HorizSync 28.0-80.0  
  VertRefresh 48.0-75.0  
  Modeline "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync  
EndSection  
Section "Device"  
  Identifier "Card0"  
  Driver "dummy"  
  VideoRam 256000  
EndSection  
Section "Screen"  
  DefaultDepth 24  
  Identifier "Screen0"  
  Device "Card0"  
  Monitor "Monitor0"  
  SubSection "Display"  
    Depth 24  
    Virtual  3000 1700
  EndSubSection  
EndSection

insert nomodeset in grub2 kernel parameters (maybe delete quiet rghb)