[K12OSN] HA Clustering k12ltsp

James P. Kinney III jkinney at localnetsolutions.com
Mon Nov 10 23:43:35 UTC 2008

With DHCP load balancing and the new ldm load balancing, things work
pretty well now. The clustering issue I see is the user data stateful
aspect: if a system failure at the server level occurs, all users on
that server will loose access (and likely their working data as well)
until they restart their client and re-login. The fail-over is the next
area of deep work. Current efforts to mitigate this are very challenging
as it is a difficult problem. OpenSSI has much promise. There are other
clustering solutions but they all center around _stateless_ user
transactions. Think web servers and read mostly, write seldom databases
as the main HA clustering solutions.

OpenMosix has mostly stalled. Mosix is a rather expensive, proprietary
solution but is a very viable option. Kerrihged shows much promise as

On Sun, 2008-11-09 at 08:04 -0600, Barry R Cisna wrote:
> Hello List,
> Just wondering if anyone on the list here has ever done an actual HA
> clustering setup with k12ltsp? I attempted this about 5 years ago with
> the HS clustering module available in Webmin. Didn't have any luck,but
> at the time I didn't have a lot of time to scratch at it much. From that
> point We have always just set up three servers per subnet at school and
> have found that this simply "load balances" the servers within each
> subnet to were they end up with about equal number of clients logged
> into each. Not exactly RFC1234 compliant but haven't had any probs with
> this setup.
> Has anyone built a good mousetrap out of a good full fledged clustering
> setup via k12ltsp? I'm guessing , I just don't have enough geekiness to
> make this happen,:).
> Thanks,
> Barry Cisna
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James P. Kinney III          
CEO & Director of Engineering 
Local Net Solutions,LLC                           

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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