On 02/03/07, Helmut Lichtenberg <[EMAIL PROTECTED]> wrote:
> On Thu, Mar 01, 2007 at 08:28:25AM -0600, Peter Scheie wrote:
> > Martin Woolley wrote:
> > > On Tuesday 27 February 2007 13:39, Noel wrote:
> > >> Tadeu F. Oliveira wrote:
> > >>> Hi, Everybody
> > >>> does anyone have tried LTSP with some kind of load balance?
> > [...]
>
> We have some basic clustering with the following setup:
>
> All thin clients boot from one DHCP/tftp server and get their image from
> there.
>
> In their image, they run a startx script from /etc/init.d, where they get a
> list of available XDMCP servers in our LAN, which are currently 3 Xeon-SMP
> machines. These work as application servers for the thin clients.
>
> The script loops through this list with xdmping and gets these parameters from
> each machine:
>
> # xdmping ots-6 -v -t 1
> contacting 10.1.0.26...
> ots-6: 13 users, load: 0.49, 0.69, 0.50
>
> With some grep, awk, and sort magic the machine with the least load is chosen.
> The XWindow system of the client is then started with (e.g.):
>
> /usr/X11R6/bin/X -query ots-6
>
> This works fine for us and it must be easy to integrate it into standard LTSP.
>
> We currently run a non-LTSP solution from a german company Gonicus, where the
> above mentioned script originates from. But we are just in the process of
> coming back home into LTSP realm with some additional fiddeling to provide our
> centralized information about thin clients and application servers from LDAP
> for LTSP, maybe by dynamically creating ltsp.conf files. But this is another
> topic.
>
> > Martin-
> > Just curious: how are you handling user authentication and sharing the
> > /home directory
> > among your servers, such that it doesn't matter which server a user is
> > connected to?
>
> We have all /home dirs on a centralized file server (which is the
> DHCP/tftp server), connected to the application servers via Gigabit ethernet.
> Authentication is done with LDAP/Kerberos.
>
We have very much the same set up, except X is started on the clients
with a one line change to the ltsp setup (well its very nearly a one
line change)
In etc/screen.d/startx on the thin client image. The line
XF_ARGS="-query ${XDM_SERVER}"
now reads
if [ "${XDM_SERVER}" = "BROADCAST" ]; then
XF_ARGS="-broadcast"
else
XF_ARGS="-query ${XDM_SERVER}"
fi
As far as security we use pam_pgsql but really any pam/nss module will
do if it can handle a network based user database. This is mostly due
to my personal hatred of LDAP.
Peter.
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