[master] ab34ea9f2 update and (hopefully) improve the directors dev guide

[Dridi Boukelmoune]

On Wed, Sep 12, 2018 at 7:44 PM, Nils Goroll <nils.goroll at uplex.de> wrote:
>
> commit ab34ea9f24235952596fce211f9a9b05a9ddd77d
> Author: Nils Goroll <nils.goroll at uplex.de>
> Date:   Wed Sep 12 19:41:25 2018 +0200
>
>     update and (hopefully) improve the directors dev guide
>
>     Much more could be said, but I hope this helps understand the
>     overall concepts a bit better.
>
>     I've also taken the freedom to reword "cluster" in the director
>     concept to "load balancer" because at least in my experience, the
>     former is used more for some form of tighter binding between nodes,
>     while the latter is a common term for what directors usually do.

I chose not to use "load balancer" exactly for the opposite reason.
Usually the first reason to have clusters of backends is high
availability, and once we have a cluster in place then yes load
balancing may not be a bad idea. And as far as vmod_directors is
concerned, fallback does the opposite of balancing workloads.

Dridi