malcolm at loadbalancer
Apr 3, 2009, 1:26 AM
Post #2 of 3
(631 views)
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Re: [lvs-users] Fully disabling UDP "persistence"
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Christian,
We use the OPS one packet scheduling patch for this....for people
using UDP SIP gateways.
can't remember where it is off the top of my head though.
give me a shout if you can't find it.
2009/4/3 Christian Balzer <chibi [at] gol>
>
> Hello,
>
> LVS defines a UDP connection as packets coming from the same source IP
> within a 5 minute window. Which I guess for services like NTP would be a
> good thing[TM].
> One can tune that down to 1 second with "ipvsadmin --set" and while this
> will give a much better spread (or any spread at all, since with a packet
> every 2 seconds on average here it never changed realservers with the
> default) it still will stick with one realserver EXACTLY when you want it
> to balance things most, at the most busy times.
> This is for radius and if our last mile provider drops all of Tokyo in a
> maintenance we get greeted with several 10000 auth-requests at the same
> time. Precisely the time when sticking with one server is not what we
> want.
> So I presume the (in 2000) suggested UDP timeout=0 option never got
> implemented, right?
> And I guess using the NQ scheduler would not help in this situation either,
> since the persistence happens before it can decide to route this to an
> unused realserver, correct?
>
> I guess an idea for the future would be a scheduler that is not connection
> but packet oriented, this would provide me exactly with what I need for
> this (admittedly special) case.
>
> Oh and is there any other way than calling "ipvsadmin --set" to set those
> timeout values in a persistent way? Feels a bit silly to write an
> initscript just for this, but since these don't seem to be sysctl
> variables...
>
> Regards,
>
> Christian
> --
> Christian Balzer Network/Systems Engineer NOC
> chibi [at] gol Global OnLine Japan/Fusion Network Services
> http://www.gol.com/
> https://secure3.gol.com/mod-pl/ols/index.cgi/?intr_id=F-2ECXvzcr6656
>
> _______________________________________________
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--
Regards,
Malcolm Turnbull.
Loadbalancer.org Ltd.
Phone: +44 (0)870 443 8779
http://www.loadbalancer.org/
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