264 lines
9.6 KiB
HTML
264 lines
9.6 KiB
HTML
<!--startcut ======================================================= -->
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
|
|
<html><head>
|
|
<META NAME="generator" CONTENT="lgazmail v1.1D.l">
|
|
<TITLE>The Answer Guy 34:
|
|
Remote X using xdm
|
|
</TITLE>
|
|
<!-- ORIGINAL SUBJECT:
|
|
xdm
|
|
JTD SUBTITLE:
|
|
|
|
-->
|
|
</head>
|
|
|
|
<BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#A000A0"
|
|
ALINK="#FF0000">
|
|
<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>"
|
|
</H4>
|
|
<P> <hr> <P>
|
|
<!-- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
|
|
<H1 align="center"><A NAME="answer">
|
|
<img src="../../gx/dennis/qbubble.gif" alt="" border="0" align="middle">
|
|
<a href="../index.html">The Answer Guy</a>
|
|
<img src="../../gx/dennis/bbubble.gif" alt="" border="0" align="middle">
|
|
</A></H1>
|
|
<BR>
|
|
<H4 align="center">By James T. Dennis,
|
|
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a>
|
|
<BR>Starshine Technical Services, <A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
|
|
</H4>
|
|
<p><hr><p>
|
|
<!--endcut ========================================================= -->
|
|
<H3><img src="../../gx/dennis/qbub.gif" alt="(?)"
|
|
width="50" height="28" align="left" border="0"
|
|
>Remote X using xdm</H3>
|
|
<p><strong>From Andy Faulkner on 28 Sep 1998 </strong></p>
|
|
<!-- begin body -->
|
|
|
|
|
|
|
|
<p><strong>Dear answerguy.
|
|
</strong></p>
|
|
|
|
<p><strong>I have been trying for the last several hours that when I first started
|
|
it sounded simple.
|
|
</strong></p>
|
|
|
|
<p><strong>I am trying to launch a <tt>xdm</tt> session on my linux box from a another linux
|
|
box on the same network.
|
|
</strong></p>
|
|
|
|
<p><strong>I have tried to use "<tt>chooser</tt>" but it brings up no listed hosts. Also
|
|
when I fire up chooser I see nothing going across the network. I hate
|
|
to say this but with my Winblows box I can do it with reflectionX. I am
|
|
running <A HREF="http://www.suse.com/">S.u.S.E.</A> 5.2 and the other machine is running 5.3. We are both
|
|
using <A HREF="http://www.kde.org/">KDE</A> and also using <tt>kdm</tt> instead of <tt>xdm</tt>. We have tried both, and
|
|
both had the same results. It looks as though I am not sending the
|
|
request out to the host for a <tt>xdm</tt> session.
|
|
</strong></p>
|
|
|
|
<p><strong>I can't seem to find any docs on "<tt>chooser</tt>" or on how to launch a session
|
|
on a linux box.
|
|
</strong></p>
|
|
|
|
<p><strong>What do you think?
|
|
Andy Faulkner
|
|
</strong></p>
|
|
|
|
<blockquote><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)" height="28" width="50" align="bottom">I think '<TT>chooser</TT>' (/usr/X11R6/lib/X11/xdm/chooser)
|
|
is normally run by '<TT>xdm</TT>' --- probably with some
|
|
special environment variables and parameters.
|
|
--- I don't think it's feasible to run '<TT>chooser</TT>' by
|
|
itself. (That would be a good reason to put it in the
|
|
"lib" directory rather than under a bin directory ---
|
|
and would explain why it has no man page of its own.
|
|
</blockquote>
|
|
|
|
<blockquote>(I'll grant that this seems like an odd way to
|
|
do it --- since making '<TT>chooser</TT>' a shared library
|
|
would make more sense from a classical programming
|
|
point of view. In any event I don't know how you'd
|
|
use '<TT>chooser</TT>' directly).
|
|
</blockquote>
|
|
|
|
<blockquote>Remote execution of X sessions via xdm is a bit confusing.
|
|
Under S.u.S.E. they have a script <tt>/sbin/init.d/rx</tt> which can
|
|
be used with their <tt>/etc/rc.config</tt> variable settings to run
|
|
the xdm and allow access via XDMCP (the X display manager
|
|
control protocol).
|
|
</blockquote>
|
|
|
|
<blockquote>To remotely access systems running these display managers
|
|
you have to run your X server with a command such as:
|
|
</blockquote>
|
|
|
|
|
|
<blockquote><blockquote><code>X -broadcast
|
|
</code></blockquote></blockquote>
|
|
|
|
<blockquote>(connect to the "first" --- or only --- available xdm
|
|
server).
|
|
</blockquote>
|
|
|
|
<blockquote>Alternatively you can specify the server you want to
|
|
connect to with a command like:
|
|
</blockquote>
|
|
|
|
|
|
<blockquote><blockquote><code>X -query $HOST
|
|
</code></blockquote></blockquote>
|
|
|
|
|
|
<blockquote>--- which will require the host name or IP address.
|
|
</blockquote>
|
|
|
|
<blockquote>To use the chooser you have to run a command like:
|
|
</blockquote>
|
|
|
|
|
|
<blockquote><blockquote><code>X -indirect $HOST
|
|
</code></blockquote></blockquote>
|
|
|
|
<blockquote>... this will cause the xdm on the named host to
|
|
provide a list of known xdm hosts (possibly including
|
|
itself).
|
|
</blockquote>
|
|
|
|
<blockquote>In any of these cases the '<TT>xdm</TT>' process must already
|
|
be running on the remote host. That host need not
|
|
be running any X server! (I realize the terminology
|
|
is confusing --- more on that later).
|
|
</blockquote>
|
|
|
|
<blockquote>To quote the xdm man page:
|
|
</blockquote>
|
|
|
|
<blockquote><blockquote>
|
|
When xdm receives an Indirect query via XDMCP, it can run
|
|
a chooser process to perform an XDMCP BroadcastQuery (or
|
|
an XDMCP Query to specified hosts) on behalf of the
|
|
display and offer a menu of possible hosts that offer XDMCP
|
|
display management. This feature is useful with X
|
|
terminals that do not offer a host menu themselves.
|
|
</blockquote></blockquote>
|
|
|
|
<blockquote>(it's also possible to configure the list manually
|
|
and to configure it so that some BroadcastQuery replies
|
|
are ignored).
|
|
</blockquote>
|
|
|
|
<blockquote>I have no '<TT>kdm</TT>' incorporates all of these functions are
|
|
not. You should look through their man page for details.
|
|
</blockquote>
|
|
|
|
<blockquote>I'm also a bit unclear on how you'd run xdm such that
|
|
it would <EM>not</EM> run a local display server. I know it's
|
|
possible, but I'm not sure how. (In other words, if you
|
|
want to run '<TT>kdm</TT>' on your console and '<tt>xdm</tt>' for the
|
|
remote X servers).
|
|
</blockquote>
|
|
|
|
<blockquote>I realize the terminology is a bit confusing here. We
|
|
have "xdm servers" running on one machine, and X servers
|
|
(the X Windows <EM>display server</EM> --- the think that actually
|
|
controls your video card) running on other machines. Note
|
|
that the X <EM>display server</EM> controls your video card and
|
|
acts as a communications package between your display
|
|
(keyboard, video, and mouse) and the programs that are
|
|
running under X (the "clients" to your display server).
|
|
</blockquote>
|
|
|
|
<blockquote>Thus '<TT>xdm</TT>' is a "client" to your X display server
|
|
regardless of whether that '<TT>xdm</TT>' process is running on
|
|
you localhost or on another machine on the network.
|
|
</blockquote>
|
|
|
|
<blockquote>To complicate issues even further the '<TT>xdm</TT>' "indirect"
|
|
option first connects your X server to a one client
|
|
--- then, based on the selection you make from the
|
|
chooser, it restarts your X server with instructions on
|
|
connecting to another '<TT>xdm</TT>' host.
|
|
</blockquote>
|
|
|
|
<blockquote>In the end, when you connect to a host via 'xdm', you
|
|
log into and it is as though you were running an X session
|
|
at that system's console. All of the windows you open
|
|
will be processes running on the '<TT>xdm</TT>' host. So you can
|
|
think of '<TT>xdm</TT>' as a combined '<tt>getty</tt>' and
|
|
'<tt>telnetd</tt>' and '<tt>login</tt>' for the X protocol.
|
|
</blockquote>
|
|
|
|
<blockquote>There are a variety of shell scripts under
|
|
<tt>/usr/X11R6/lib/X11/xdm</tt> that control how the console is
|
|
"taken" (back from a user that logs out) "given"
|
|
(to a user that logs in), "setup" (prior to xdm's
|
|
display of the "xlogin" widget), "started" (as 'root'
|
|
but after login) and how the "session" is started
|
|
(under the user's UID).
|
|
</blockquote>
|
|
|
|
<blockquote>You'll want to read the xdm man page and all of the
|
|
scripts and resource files in the xdm directory to
|
|
adjust these things. (It just amazes me how complicated
|
|
all that vaunted "flexibility" and all those customization
|
|
options can make something as seemingly simple as:
|
|
provide me with a GUI login).
|
|
</blockquote>
|
|
|
|
<blockquote>Anyway, I hope that helps.
|
|
</blockquote>
|
|
<!-- end body -->
|
|
|
|
<!--startcut ======================================================= -->
|
|
<P> <hr> <P>
|
|
<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
|
|
>Copyright ©</a> 1998, James T. Dennis <BR>
|
|
Published in <I>Linux Gazette</I> Issue 34 November 1998</H5>
|
|
<P> <hr> <P>
|
|
<!-- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
|
|
<P align="center">
|
|
<table width="98%"><tr valign="center" align="center">
|
|
<td rowspan="3"><A HREF="../lg_answer34.html"><IMG
|
|
SRC="../../gx/dennis/answernew.gif"
|
|
ALT="[ Answer Guy Index ]"></A></td>
|
|
<td><A HREF="./apache.html">apache</a>
|
|
<td><A HREF="./current.html">current</a>
|
|
<td><A HREF="./digi.html">digi</a>
|
|
<td><A HREF="./ether.html">ether</a>
|
|
<td><A HREF="./goodtimes.html">goodtimes</a>
|
|
<td><A HREF="./intlX.html">intlX</a>
|
|
<td><A HREF="./largedisk.html">largedisk</a>
|
|
</tr><tr valign="center" align="center">
|
|
<td><A HREF="./maybe.html">maybe</a>
|
|
<td><A HREF="./numlock.html">numlock</a>
|
|
<td><A HREF="./quota.html">quota</a>
|
|
<td><A HREF="./recovery.html">recovery</a>
|
|
<td><A HREF="./script.html">script</a>
|
|
<td><A HREF="./serial.html">serial</a>
|
|
<td><A HREF="./session.html">session</a>
|
|
</tr><tr valign="center" align="center">
|
|
<td><A HREF="./sound.html">sound</a>
|
|
<td><A HREF="./tape.html">tape</a>
|
|
<td><A HREF="./testsuite.html">testsuite</a>
|
|
<td><A HREF="./w95ie.html">w95ie</a>
|
|
<td><A HREF="./w95ras.html">w95ras</a>
|
|
<td><A HREF="./w95virus.html">w95virus</a>
|
|
<td><A HREF="./xdm.html">xdm</a>
|
|
</tr></table>
|
|
</P>
|
|
<P> <hr> <P>
|
|
<!-- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
|
|
<A HREF="../index.html"><IMG SRC="../../gx/indexnew.gif"
|
|
ALT="[ Table Of Contents ]"></A>
|
|
<A HREF="../../index.html"><IMG SRC="../../gx/homenew.gif"
|
|
ALT="[ Front Page ]"></A>
|
|
<A HREF="../lg_bytes34.html"><IMG SRC="../../gx/back2.gif"
|
|
ALT="[ Previous Section ]"></A>
|
|
<A HREF="../izquierdo.html"><IMG SRC="../../gx/fwd.gif"
|
|
ALT="[ Next Section ]"></A>
|
|
</body>
|
|
</html>
|
|
<!--endcut ========================================================= -->
|
|
|