Re: New configuration subsystem for LTSP

On Thu, 2010-12-30 at 18:33 +0200, Alkis Georgopoulos wrote:
> I implemented a draft for a bash/inetd based daemon that accepts some
> variables from the clients, sources whatever shell scripts are
> in /etc/ltsp/config.d, and returns the resulting "lts.conf" to the
> clients, see the usage function inside the code:
> http://ltsp.pastebin.com/3ESzWF4f
> 
> And we also started implementing a GUI editor for that new system:
> http://imagebin.org/index.php?mode=image&id=130256
> 
> Some benefits of the new system:
>  * More powerful, e.g. can set lts.conf vars when "client ram < 500"
>  * It's based on bash scripts, so the sysadmin or packages can drop
>    configuration code in /etc/ltsp/config.d
>  * If desired, it can also substitude ldminfod to save ram + a port.
> 
> If there's interest in it, I can have a working version in a few days.
> Of course I'm not going to commit anything if someone thinks it's not a
> good idea.
> 
> Happy new year to all,
> Alkis

Hi Alkis,

We really should talk :)
I implemented the exact same thing for ltsp-cluster over the last few
weeks.

It's the first working module of the ltsp-agent that supports multiple
configuration source including fallback and caching.
Code is currently in:         
 - lp:~ltsp-cluster-team/ltsp-cluster/ltsp-cluster-agent
 - lp:~ltsp-cluster-team/ltsp-cluster/ltsp-cluster-agent-thinclient
 - lp:~ltsp-cluster-team/ltsp-cluster/ltsp-cluster-agent-appserv

I've got support for tftp, http, https and the ltsp-cluster
control-center protocol. Memory usage is very low, only uses 20kB once
python is loaded (it usually is because of jetpipe or other scripts).
It has a plugin infrastructure is I believe extremely simple and offers
pretty much everything you might want.

I plan on having ldm and ltsp scripts changed over the next two weeks to
use the daemon when present. That should save us from any call to
getltscfg, instead using a unix socket or simply sourcing a file from
disk.

There'll also soon be more plugins to re-implement all of ltsp-cluster
on top of it. All development is made so it's completely optional but my
hope is to have it used by upstream LTSP eventually so LTSP-Cluster will
essentially be completely merged.

If you're interested in using it and helping make it ready for everyone
to use, let me know and I'll find some time to explain it to you.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com

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