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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 16:56:19 +0100
Message-ID: <20191204155619.GU14469@orbyte.nwl.cc> (raw)
In-Reply-To: <5337E60B-E81D-46ED-912F-196E23C76701@cisco.com>

On Wed, Dec 04, 2019 at 03:42:00PM +0000, Serguei Bezverkhi (sbezverk) wrote:
> Hi Phil,
> 
> I can also minimize any impact by inserting a new rule in front of the old one, and then delete the old one. So in this case there should no any impact. Here is iptables rules I try to mimic:

Yes, that's more or less equivalent to doing it in a single transaction.

> // -A KUBE-SVC-57XVOCFNTLTR3Q27 -m statistic --mode random --probability 0.50000000000 -j KUBE-SEP-FS3FUULGZPVD4VYB
> // -A KUBE-SVC-57XVOCFNTLTR3Q27 -j KUBE-SEP-MMFZROQSLQ3DKOQA
> // !
> // ! Endpoint 1 for KUBE-SVC-57XVOCFNTLTR3Q27
> // !
> // -A KUBE-SEP-FS3FUULGZPVD4VYB -s 57.112.0.247/32 -j KUBE-MARK-MASQ
> // -A KUBE-SEP-FS3FUULGZPVD4VYB -p tcp -m tcp -j DNAT --to-destination 57.112.0.247:8080
> // !
> // ! Endpoint 2 for KUBE-SVC-57XVOCFNTLTR3Q27
> // !
> // -A KUBE-SEP-MMFZROQSLQ3DKOQA -s 57.112.0.248/32 -j KUBE-MARK-MASQ
> // -A KUBE-SEP-MMFZROQSLQ3DKOQA -p tcp -m tcp -j DNAT --to-destination 57.112.0.248:8080
> 
> As you can see SVC chain KUBE-SVC-57XVOCFNTLTR3Q27 load balance between 2 endpoints.

OK, static load-balancing between two services - no big deal. :)

What happens if config changes? I.e., if one of the endpoints goes down
or a third one is added? (That's the thing we're discussing right now,
aren't we?)

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 [this message]
2019-12-04 16:13           ` Serguei Bezverkhi (sbezverk)
2019-12-04 17:00             ` Phil Sutter
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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