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Emilien,

thanks for sharing this, which I reckong is going to be a very interesting
discussion at the next summit.
Of the two alternatives, I tend to prefer the latter as it is capable of
handling better failover; it would be good if you could more details about
the failover procedure; in the document you mention that failover for
internal and gateway interface should be synchronized; it would be great to
understand how you're planning to do that.

Another aspect to consider is how this relates to nova-network's multi-host
feature, which is, in my understanding, the only bit missing from making
nova-network features a complete subset of neutron's features. Other than
HA and failover, the multi host feature provides also a load distribution
capability. Is that something that can be incorporated in your proposal?

Regards,
Salvatore


On 11 September 2013 12:13, Emilien Macchi <emilien.macchi at enovance.com>wrote:

> Hi,
>
> The current implementation of Neutron L3 agent allows us to scale
> virtual routers on multiple agents but does not provide High
> Availability on :
> - namespaces, virtual interfaces (both in north and south)
> - established connections between external & internal network.
>
> The idea here is to start a discussion about a new design that we could
> implement in the next release.
> Since there exists some conversations on this topic, I want to share my
> ideas with a public document we wrote [1] with my team.
>
> Table of contents:
> - Abstract about current implementation
> - Current Architecture
> - Proposal #1: Health-check (which is not my final solution, but just an
> existing way).
> - Proposal #2: VRRP + conntrackd (new backends for improving L3 agent)
> - Design session proposal for next Summit
>
>
> Feel free to bring your thoughts.
> After the discussion, maybe could we write new blueprints.
>
> Note: the document is public and you are allowed to comment. If you need
> more access, I can of course grant you write rights.
>
> [1]
>
> https://docs.google.com/document/d/1DNAqRSOIZPqUxPVicbUMWWuRBJ90qJjVYe7Ox8rVtKE/edit?usp=sharing
>
>
> Regards,
>
> --
> Emilien Macchi
> ----------------------------------------------------
> # OpenStack Engineer
> // eNovance Inc.              http://enovance.com
> // ✉ emilien at enovance.com     ☎ +33 (0)1 49 70 99 80
> // 10 rue de la Victoire 75009 Paris
>
>
>
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