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I am using OS X Lion. I have a Vagrant box running CentOS 6.0 minimal on my mac. I am trying to install Oracle 10g on my CentOS 6. I keep getting an error 

Can't connect to X11 window server

I have tried setting the DISPLAY variable to all the possible values; localhost, CentOS IP addr, Lion IP addr.. I just keep getting this error.

xclock doesn't work on CentOS (even as root). But xclock works fine on Lion.

How can I fix this error? Thanks

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You installed CentOS minimal, so you don't have an X server running locally in the VM. If you want to try to install one, http://www.centos.org/modules/newbb/viewtopic.php?topic_id=36887&forum=55 has some information about getting an X server set up (it's unfortunately easiest to simply set up one of the desktop environments).

You cannot use the X server in Lion for this directly from inside the VM, unless you enable insecure network connections. Better would be to ssh -Y into the VM from Lion; you can then run X11 programs from within that session with X11 forwarding to Lion's X server.

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  • I have run yum groupinstall "X Window System"
    – y2p
    Commented Apr 22, 2012 at 4:46
  • Okay, if that didn't configure and launch a display manager, you will then need to run startx to actually launch it; then you can run the installer from within a terminal window. (Linux is not like OS X; there is no launchd configured to autostart X11.)
    – geekosaur
    Commented Apr 22, 2012 at 4:51
  • When I run startx, the terminal halts at expected keysym, got XF86TouchpadOff: line 121 of inet. And I have to run the Oracle installer from a different session. On running the installer I get Preparing to launch Oracle Universal Installer from /tmp/OraInstall2012-04-22_05-30-43AM. Please wait .....and it breaks and comes back to my prompt
    – y2p
    Commented Apr 22, 2012 at 5:32
  • That sounds like it has started X11 in a different virtual console but not switched you over to it for some reason (the "hang" is because the server is running in the foreground). Try switching consoles with Ctrl+Alt+Fn (that is, function keys F1, F2, etc.; X11 often starts on F7) until you find the one with the X11 session; the Oracle installer should have a window open there.
    – geekosaur
    Commented Apr 22, 2012 at 5:39
  • Does this work with Mac? I am on CentOS in terminal (no graphics). Alt+Fn opens OS X applications. Ctrl+Alt+Fn does not do anything.
    – y2p
    Commented Apr 22, 2012 at 5:55

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