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You might like to look at keepalived which implements a sorry server.
Keepalived uses the LVS framework. http://www.keepalived.org
Shaun
-----Original Message-----
From: lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx
[mailto:lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Roberto
Nibali
Sent: Wednesday, November 22, 2006 4:21 PM
To: LinuxVirtualServer.org users mailing list.
Subject: Re: Limit
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)?
> 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.
> 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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