Centos Container with Gui

Yes, @morph027 is right. You can run as many virtual screens as possible with x2go, vnc, xrdp and others. You cannot have a "real" (as in real life) display, because you do not have "real" hardware in a container. If you need this, please use a VM and o PCIe passthrough.
 
Yes, with x2go it is working perfectly. But only on xfce and mate. All other desktop like plasma works only with nomachine workstation.
 
How did you get X2go working? I can't manage it in a container. It looks like X2go executes /usr/bin/x2gomountdirs on log in, and that fails in a container.
 
My mistake. You can use X2go in LXC containers. There must be a bug in my X2go client. If I try the same configuration using an older version it works.