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[K12OSN] need help scaling LTSP: setting up Winbind and LDAP

Hi all,

I really need advice on scaling our LTSP installation. I hope you'll bear with me as I ask this rather lengthy question. Your advice and comments will be invaluable to me!

Here's some background:

I've installed three LTSP test servers, at three different schools in our district. These schools are all located on a square mile campus and connected via a multi-mode fiber back-haul. Together the LTSP servers support 30 thin clients, which are available to the 1600 kids across our small school district. The response has been very positive. I've been given the go-ahead to scale the project up, replacing as many as 20or 30 additional aging fat clients per school.

Our authentication is provided via Active Directory on Windows 2003 and currently we provide storage for students on a windows based file-server.  My intention is to keep student account management on AD since we'll continue to support a certain segment of windows fat clients which need to authenticate to AD. Because we use group policies to manage our windows clients, it doesn't' seem feasible to create a new student domain on a linux box running samba.

My goal is to move our students away from windows based file storage completely and to centralize  the winbind.tdb so that it can handle linux to windows uid/gid mapping for all students in the district. I think these goals go hand in hand, since its my understanding that multiple linux file servers, require a single winbind database in order to keep the uid/gid mapping consistent.

I am pretty sure that I want to do this by storing my winbind user/pass data on a central ldap server since I see that winbind/SAMBA can use a LDAP backend. I am trying to figure out where and how to start thinking about this. I am not even sure if this is incredibly complex or really straight-forward.

1) Has anyone on this list done something similar

2) If so how successfully? Using what resources etc?

3) I DO need to migrate the current windows directory tree holding student work to a new linux file server. Perhaps it would be as easy as using xcopy or robocopy? But how would I automagically make my linux/samba users own the contents of their migrated directories?

4) I've seen http://wiki.ltsp.org/twiki/bin/view/Ltsp/LDAP
http://www.majen.net/smbldap/ and http://www.vcsvikings.org/docuwiki/cgi-bin/moin.cgi/
am I on the right track?

Many thanks in advance. I await your replies with bated breath!


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