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From: Phil Sutter <phil@nwl.cc>
To: "Serguei Bezverkhi (sbezverk)" <sbezverk@cisco.com>
Cc: "netfilter-devel@vger.kernel.org" <netfilter-devel@vger.kernel.org>
Subject: Re: Numen with reference to vmap
Date: Wed, 4 Dec 2019 18:00:32 +0100
Message-ID: <20191204170032.GV14469@orbyte.nwl.cc> (raw)
In-Reply-To: <BC928D69-611E-4F9E-A457-7C78F6D0779A@cisco.com>

Hi,

On Wed, Dec 04, 2019 at 04:13:45PM +0000, Serguei Bezverkhi (sbezverk) wrote:
> It is not static, SVC chain jump rules will be updated on every endpoint change,  the dynamic nature is  achieved by manipulating rules. It is doable with nftables, I understand that, but I was also looking for a more efficient way to do it, my concern is if we use 1 to 1 conversion, we will end up with the same iptables scalability/performance  limitations.
> 
> Here is how rules look after a third and forth endpoint gets dynamically added to the service.
> 
> -A KUBE-SVC-57XVOCFNTLTR3Q27 -m statistic --mode random --probability 0.25000000000 -j KUBE-SEP-FS3FUULGZPVD4VYB
> -A KUBE-SVC-57XVOCFNTLTR3Q27 -m statistic --mode random --probability 0.33332999982 -j KUBE-SEP-MMFZROQSLQ3DKOQA
> -A KUBE-SVC-57XVOCFNTLTR3Q27 -m statistic --mode random --probability 0.50000000000 -j KUBE-SEP-TEWRTAGT3CD3D47Z
> -A KUBE-SVC-57XVOCFNTLTR3Q27 -j KUBE-SEP-4WMWD734WJQW264U

Ah, that's nice. The rules are updated in a way that with a single added
rule probabilities are equalized again. This is something I fear we
can't do with a map in nftables yet, I guess it would need a new object
type (or maybe a special set/map type or something. All you can do for
now is copy the above in nftables.

Cheers, Phil

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04  0:54 Serguei Bezverkhi (sbezverk)
2019-12-04 10:18 ` Phil Sutter
2019-12-04 13:47   ` Serguei Bezverkhi (sbezverk)
2019-12-04 15:17     ` Phil Sutter
2019-12-04 15:42       ` Serguei Bezverkhi (sbezverk)
2019-12-04 15:56         ` Phil Sutter
2019-12-04 16:13           ` Serguei Bezverkhi (sbezverk)
2019-12-04 17:00             ` Phil Sutter [this message]
2019-12-04 17:31           ` Arturo Borrero Gonzalez
2019-12-04 17:49             ` Serguei Bezverkhi (sbezverk)
2019-12-04 21:05               ` Serguei Bezverkhi (sbezverk)
2019-12-04 22:32             ` Phil Sutter

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