Re: [K12OSN] Multiple LTSP servers

Eric Harrison (eharrison@mail.mesd.k12.or.us)
Wed, 4 Sep 2002 20:12:26 -0700 (PDT) 

On Tue, 3 Sep 2002, Jennifer Waters wrote:

>I have four LTSP servers and I need a way to tell a
>workstation which LTSP server it is 
>going to be working from.  The servers have one nic
>card and are going through switches.  
>Any help would be great.  Behind the curve here with
>school starting.
>
>Jennifer

Here's a real-quick XDM chooser HOWTO. This is how I set up Riverdale
High School's new servers, it may or may not be the best way to do it but
it is known to work ;-)

This assumes that your servers default to KDE. I have not tried this under
GNOME or straight XDM.


1) Pick out one server to be your main server. Point DHCP to this one server.

2) On the main server, export the /home directory read/write. If your IP range
   is 192.168.0.0/24, for example, you would add the following line to 
   /etc/exports

		home                  192.168.0.0/255.255.255.0(rw)

   and then run the following command:

		exportfs -a


3) Configure the other servers to mount /home from the main server.
   If your main server is 192.168.0.254, for example, you would add the
   following line to the "/etc/fstab" file on all of the other LTSP servers:

		192.168.0.254:/home	 /home	nfs defaults,rsize=8192,wsize=8192 0 0

  and then run the following command:

		mount /home/

4) The default "chooser" is pretty ugly, so we're going to spice it up a little.
   start by creating the file /etc/X11/xdm/pretty-chooser with the following
   lines:

		#!/bin/sh
		/usr/X11R6/bin/xsetroot -solid skyblue4
		exec /etc/X11/xdm/chooser $*

   make this file executable with the following command:

		chmod +x /etc/X11/xdm/pretty-chooser


   Next append the following lines to /etc/X11/xdm/Xresources


	    Chooser*geometry:            500x200+300+225
	    Chooser*allowShellResize:    false
	    Chooser*ShapeStyle:          Oval
	    Chooser*viewport.forceBars:  true
	    Chooser*label.label:         Application Servers
	    Chooser*label.font:          *-*-bold-i-normal-*-240-*
	    Chooser*list.font:           -misc-fixed-medium-r-semicondensed--13-120-75-75 -c-60-iso8859-1
	    Chooser*Command.font:        *-*-bold-r-normal-*-180-*
	    Chooser*Form.background:     gray80
	    Chooser*label.foreground:    white
	    Chooser*label.background:    midnightblue
	    Chooser*Command.background:  gray80
	    Chooser*internalBorderColor: black
	    Chooser*Command.font:        -adobe-helvetica-bold-r-*-*-12-*
	    Chooser*viewport.useRight:   false
	    Chooser*list.columnSpacning: 25
	    Chooser*list.defaultColumns: 1
	    Chooser*list.verticalList:   true

5) Limit the list in the chooser to just the servers you want listed.
   Edit /etc/X11/xdm/Xaccess, commenting out all of the existing lines, and
   then appending the following lines:

	    *       CHOOSER server1 server2 server3 sever4
	    *       CHOOSER BROADCAST   #any indirect host can get a chooser
	    *           # any host can get a login window

   be sure to replace "server1", "server2", etc with the real names of the
   servers.


6) In /etc/X11/xdm/kdmrc (this is the KDE specific part), uncomment the
   Resources= and Choosers= lines, setting them to the following values:

	    Resources=/etc/X11/xdm/Xresources
	    Chooser=/etc/X11/xdm/pretty-chooser

7) In /opt/ltsp/i386/etc/rc.local, change all occurances of "-query" to
   "-indirect", such as:

		echo "/usr/X11R6/bin/${XBINARY} ${XOPTS} ${ACC_CTRL} -indirect ${XDM_SERVER}" >/tmp/start_ws


8) Fire up a terminal an see if it works ;-)


-Eric



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