Re: Location of lts.conf file

> > BUT, what do you all think about looking for a common file as:
> > /var/lib/tftpboot/ltsp/lts.conf,  without the arch ?

> Since in LTSP 6 we'll have to rewrite most of our code base,
> and all LDM_* variables won't be supported anymore due to libpam_sshauth
> / LightDM,
> so sysadmins will have to revisit their configuration anyway,
> (and it's a good chance to break backwards compatibility wrt
> configuration, removing ancient or undocumented stuff),
> 
> I'm pretty much in favor of not using TFTP as the basis of our
> configuration system anymore, but instead to switch to using a (probably
> python-based) daemon that reads configuration files from the server
> /etc/ltsp/config.d/, and exports them to the clients upon request.
> 
> E.g. a client could do from the initramfs:
> wget
> http://server:1234/config?phase=initramfs&arch=i386&ip=xxx&mac=xxx&hostname=xxx&...
> -O config
> . config

We wrote our own TFTP server to overcome some boottime problems in LTSP 
environments. We have some thin/fat clients that need special kernels and/or 
kernel parameters to work correctly. Since we have too many clients to so 
that it would be practical to modify pxelinux.cfg files manually, we have 
now a hook script for our TFTP server that fetches the kernel information 
from LDAP when the client requests the pxelinux.cfg during boot.

This same method can be used also for generating lts.conf during boot.

puavo-tftpd server is written in ruby and it can be used in two ways:
* send output of hook scripts called when a regex matches
* static files if regexes do not match

The code is available on Github: https://github.com/opinsys/puavo-tftp

Here's an example configuration file:

/etc/puavo-tftp.yml:
-------------------------------------------------------
hooks:
  - regexp: pxelinux.cfg\/01-(([0-9A-Fa-f]{2}[:-]){5}[0-9A-Fa-f]{2})
    command: puavo-ltspboot-config
  - regexp: lts.conf$
    command: puavo-lts-config
-------------------------------------------------------

This means that if regex

pxelinux.cfg\/01-(([0-9A-Fa-f]{2}[:-]){5}[0-9A-Fa-f]{2}) 

matches, it calls the script puavo-ltspboot-config and sends the 
output of the script to requesting client. Multiple regexes can call 
the same script.

pxelinux.cfg script:
https://github.com/opinsys/puavo-tftp/blob/master/hooks/puavo-ltspboot-config

lts.conf script:
https://github.com/opinsys/puavo-tftp/blob/master/hooks/puavo-lts-config

One could write easily a new script that would e.g. source other files 
from a directory under /etc/ltsp/config.d/ and return everything merged.

There are still some known caching issues for static files in puavo-tftpd, 
but we are currently working on those.

Veli-Matti

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