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List: freenx-knx
Subject: Re: [FreeNX-kNX] load balancing question(s)
From: Matthew Richardson <M.Richardson () ed ! ac ! uk>
Date: 2009-02-05 15:10:43
Message-ID: 498B0173.7070906 () ed ! ac ! uk
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Matt Nicholson wrote:
> Does any one have any experience with load balancing issues? I have
> forwarding working, but load balancing is what we really want, and
> I've basically hit a brick wall, and am not getting much in the way of
> useful output from anything? Any help? Please?
>
>
> I've got 3 systems; access01, access02, and access03.
>
> access01 will be my load balancer, so its node.conf has:
>
> LOAD_BALANCE_SERVERS="access01 access02 access03"
>
> # The following load_balance_algorithms are available at the moment:
> #
> # "load", "round-robin", "random"
> #
> # For "load" you need a script called nxcheckload in PATH_BIN.
> #
> # A sample script, which you can change to your needs it shipped with
> # FreeNX under the name nxcheckload.sample.
>
> LOAD_BALANCE_ALGORITHM="
> random"
>
> access02 and 03 have:
>
> ENABLE_SERVER_FORWARD="1"
> SERVER_FORWARD_HOST="access01"
> SERVER_FORWARD_PORT=22
> SERVER_FORWARD_KEY="/usr/NX/share/client.id_dsa.key"
>
>
I think this is the wrong way to go about it. you can't enable FORWARD
and LOAD_BALANCE on the same computer, or you'll potentially end up
going round and round in circles. Since a connection to access02 will
forward to 01, and 01 will load balance back to 02 again, you'll just
get horribly stuck.
the best approach is to do:
access01:
LOAD_BALANCE_SERVERS="access02 access 03"
LOAD_BALANCE_ALGORITHM="random"
And leave it at that. Always connect to access01. You can /probably/
put access01 in the SERVERS list as well, but I don't know if nx is
clever enough to not get stuck in a loop with this.
Once you've got the above working with no problems, try the more complex
options.
Matthew
--
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
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