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.ba...@earborg.com> wrote: > On Tue, 30 Dec 2014 21:05:18 -0500 > Heng Zhou <hzh...@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 >
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