netdev - Re: Fwd: LVS on local node

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Date:	Thu, 22 Jul 2010 17:10:22 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Franchoze Eric <franchoze@...dex.ru>, wensong@...ux-vs.org,
	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: Fwd: LVS on local node

On Thu, Jul 22, 2010 at 2:56 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> lvs seems not very SMP friendly and a bit complex.
>
> I would use an iptables setup and a slighly modified REDIRECT target
> (and/or a nf_nat_setup_info() change)
>
> Say you have 8 daemons listening on different ports (1000 to 1007)
>
> iptables -t nat -A PREROUTING -p tcp --dport 1234 -j REDIRECT --rxhash-dist --to-port 1000-1007
>
> rxhash would be provided by RPS on recent kernels or locally computed if
> not already provided by core network (or old kernel)
>
> This rule would be triggered only at connection establishment.
> conntracking take care of following packets and is SMP friendly.
>
>

I think maybe REDIRECT is enough. If the public port is one of the
real ports, you need to append "random" option to iptables target
REDIRECT. If not, "REDIRECT --to-ports 1000-1007" is good enough, and
the destination port will be selected in the round-robin manner.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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