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Roberto Nibali wrote:
Hi Roberto
Hello,
I'm trying to create a sorry server for clients that can't connect to
my real servers (limited by u-threshold)
ServerA - 100 conn
ServerB - 110 conn
when this limit is reached I want my clients to go to a lighttpd
served page saying "come back later"
I'm trying with wheights and thresholds... but it's not working the
way I thouth.
I suspect the clients scheduled for the sorry server never return back
to the cluster, right (only if you use persistency of course)?
That's right.
I'm working on a project for an airline companie.
Some times they post some promotional tickets for a small period of time
(only for passengers that buys on the website can have it) and the
servers go high.
I need to manually limit each server capacity and the remaining
connections need to go to this sorry server.
does anybody know how can I do that?
Yes, I've written a patch for the 2.4 kernel series extending IPVS to
support the concept of an atomically switching sorry server
environment. Unfortunately I didn't have the time to port the work to
2.6 kernels yet (the threshold stuff is already in but a bit broken
and the sorry server stuff needs some adjustments in the 2.6 kernel).
If you run 2.4 on your LB, you could try out the patches posted to
this list almost exactly one year ago:
http://marc.theaimsgroup.com/?l=linux-virtual-server&m=113225125532426&w=2
http://marc.theaimsgroup.com/?l=linux-virtual-server&m=113225142406014&w=2
The fix to the kernel patch above:
http://marc.theaimsgroup.com/?l=linux-virtual-server&m=113802828120122&w=2
And the 3/4 cut-off fix:
http://www.in-addr.de/pipermail/lvs-users/2005-December/015806.html
I personally believe that the sorry-server feature is a big missing
piece of framework in IPVS, one that is implemented in all commercial
HW load balancers.
We have tried F5 Big-IP for a while and it worked perfectly, but it is
very expensive for us :(
I don't know if this list is the right one for my question, if it's
not I'm sorry
It is correct. I might sit down and do the 2.6 port but I'll be
off-line soon, so chances are little that I get to it before Christmas.
Best regards,
Roberto Nibali, ratz
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