Help! 10.04 LTSP configuration using only one nic

[David Groos]

What hardware are your fat clients running on?  Is there a difference in RAM
between the good and poorly functioning clients?  I've seen these symptoms
before I upgraded the RAM on all my (Pentium 4's, 2.4-2.8 GHz) fat clients
to 1 gig.

Alkis insists that a regular PC (with sufficient RAM) works well as the LTSP
server IF you are using fat clients.  In his labs the teachers actually uses
the server as their classroom PC!  Makes the whole thing more affordable and
practical.

Do you mind sharing why you chose to use a single NIC setup?

Good luck,
David G

On Tue, Sep 6, 2011 at 3:45 PM, Jim Christiansen <
jim.c.christiansen at gmail.com> wrote:

> Hello,
>
> I've just had an aging server fail to start up and need to get to the
> bottom of another problem on another new server running Ubuntu 10.04 LTSP
> before attempting to do another install.  We lost one server in the Library
> late last June- rgreat timing and another one just today that served my
> classroom has failed to start up-  Both are 5 years or older.
>
> My old Centos LTSP server for our Library died near the end of June.  My
> students had been playing with a new 10.04 64 setup and had it serving 32
> bit fat clients, but really slowly.  One of the students altered something
> in iptables to make it function and I wonder if this could be the problem.
>  Grepping my history for iptables shows:
>
>  49  sudo iptables --table nat --append POSTROUTING --jump MASQUERADE
> --source 192.168.1.0/24
>  50  sudo sh -c 'iptables-save > /etc/ltsp/nat'
>
> This was done, apparently, to allow the system to function with one nic.
>
> The system is sitting on a 100 megabit network with 26 clients.  Only 1/3
> to 2/3 of the clients will boot right off.  The others will linger with 4
> four little streaming dots in the middle of the screen for minutes until the
> log in screen appears or they fail with errors:
>
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> INFO: task modprobe:436 blocked for more than 120 seconds.
> "echo 0 >... same as 1st line
> INFO: task udev-configure-:936 blocked for more than 120 seconds.
> "echo 0 > ...same as 1st line
> INO: taskhdparm:1020 blocked for more than 120 seconds.
> "echo 0 > ...same as 1st line
> INFO: task S32ltsp-client-:1027 blocked for more than 120 seconds.
>
> It doesn't seem any better it I boot fewer clients or more... They just
> don't all start up reliably.
>
> The clients run awesomely once students get logged on.
>
> Does anyone know what the problem could be?  I'm wondering if the natting
> is the problem or if I have other issues.
>
> Thanks everyone,
>
> Jim
>
>
> --
> edubuntu-users mailing list
> edubuntu-users at lists.ubuntu.com
> Modify settings or unsubscribe at:
> https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/edubuntu-users/attachments/20110907/5244e8e2/attachment.html>