Ask for step-by-step instructions to connect between local X server and remote display manager via XDMCP

[Heng Zhou]

Hi, Christopher Barry:

Thank you for the reply. But this is not the answer I want. Actually I
did't see any relation between my question and that link. I think I have
clearly specified what the answer is expected. Please leave the slot to
other experts. Thanks.

On Wed, Dec 31, 2014 at 8:57 AM, Christopher Barry <
christopher.barry at earborg.com> wrote:

> On Tue, 30 Dec 2014 21:05:18 -0500
> Heng Zhou <hzhou1 at cs.uml.edu> wrote:
>
> >I want set up an environment in which a local X server is connecting a
> >remote display manager via XDMCP protocol, just like the second
> >picture in the wikipedia item "X display manager" (
> >http://en.wikipedia.org/wiki/X_display_manager_%28program_type%29)
> >shows. The specific configuration is described in the following.
> >
> >A computer is running ubuntu 14.04 LTS in front of me. Call it "local
> >machine".
> >
> >A headless server is running ubuntu 14.04 LTS at another geographical
> >place. Call it "remote machine". The remote machine has no graphics
> >card, no attached monitor, but I have full control over it.
> >Concretely, it is an Amazon EC2 ubuntu instance.
> >
> >The local machine has a physical graphics card and an attached
> >monitor. It is running ordinary ubuntu desktop so the X Window System
> >-- X.Org Server -- is running after boot, presumably.
> >
> >The remote machines has installed LightDM, the display manager of
> >ubuntu. And I am sure it is running over there by checking the results
> >returned by command ps aux|grep lightdm.
> >
> >That's the configuration of the local and remote machines. Now I need
> >to follow the steps in the wikipedia item "X display manager" (please
> >see the link above) to try to connect the local X server with the
> >remote display manager LightDM. What I wish to happen should be,
> >according to my understanding of the wikipedia webpage, as follows:
> >
> >(1) The local machines run a XDMCP Chooser program to select the
> >display manager running now on the remote machine to connect.
> >
> >(2) The X server on the local machine uses XDMCP protocol to shake
> >hands with the remote display manager LightDM.
> >
> >(3) The remote display manager LightDM should respond as expected:
> >
> >a) it connects to the local X server as a client
> >
> >b) display a login GUI on the local machine, with the assistance of the
> >local X server
> >
> >c) start an X session after I log in
> >
> >d) run X applications like xterm in the session as directed; display
> >its graphical output on the local machine, using the local X display
> >server.
> >
> >e) If possible, I hope in addition to show the unity desktop on the
> >local machine, just like a normal ubuntu desktop, but the executable
> >code is actually running on the remote machine.
> >
> >That's all I want. But I have no idea how all these can be done. I
> >searched the internet and found something like
> >http://wiki.ubuntu.com/xdmcp and
> >http://danilodellaquila.com/blog/how-to-remote-login-via-xdmcp-in-ubuntu,
> >but they are either too old or too too old, and therefore useless for
> >my configuration. So I wonder if anyone familiar with XDMCP and having
> >a workable experience could please share his/her ideas on how to
> >setting up this environment. Please be specific. Thanks a lot. If you
> >need any other info, please ask.
> >
> >PS: The display manager on the remote machine doesn't have to be
> >LightDM. I specifies it just because it's light weight and I'm
> >familiar with ubuntu desktop. You can use other option, say, GDM, if
> >you are working or once worked with it, to set up the environment.
> >
> >Looking forward to any workable instructions. Thanks.
>
>
> See: http://ltsp.org/
>
> --
> -C
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.x.org/archives/xorg/attachments/20141231/f76bb099/attachment.html>