Re: [lvs-users] Setting Weight to 0 and still accepting connections

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Setting Weight to 0 and still accepting connections
From: "Sebastian Krueger" <sebykrueger@xxxxxxxxx>
Date: Fri, 31 Oct 2008 11:43:11 +1300
Thanks Graeme.

That's exactly what I was looking for.

Regards, Sebatian.

On Thu, Oct 30, 2008 at 11:03 PM, Graeme Fowler <graeme@xxxxxxxxxxx> wrote:
> On Thu, 2008-10-30 at 15:56 +1300, Sebastian Krueger wrote:
>> So I read that if I set the weight of a real server to 0, then no new
>> connections will be accepted. And yet, I definitely am seeing new
>> connections being accepted. Is there anything that I have missed out?
>> Like if I set persistent, then the weighting is ignored?
> There's a whole chapter on this in the HOWTO:
> Essentially, with persistence any clients reconnecting within the
> persistence timeout will get directed to the same realserver they
> already spoke to *regardless of the weight*. Under persistence, the
> weight only affects completely new connections - that is, connections
> from clients which have no existing persistence template entry.
> You can view that by doing "ipvsadm -Lnc" and looking for the entries
> listed as "ERR!" like so:
> IP  00:58  ERR!
> That's from a running LVS (with the addresses changed) showing a
> persistent entry for a netfilter mark (fwmark) service with mark value 5
> being sent to realserver If the client doesn't return for 58
> seconds, then this template will expire.
> If you want to force the behaviour when the weight is set to 0, you need
> to set a sysctl:
> net.ipv4.vs.expire_nodest_conn =1
> net.ipv4.vs.expire_quiescent_template =1
> The first expires all existing persistent connections when the
> realserver is removed from the pool; the second removes them when the
> weight is set to 0.
> Graeme
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