Upstream management
===================

`nginx_upstreams`: List of dict. An upstream has few keys. See bellow.

Note: Few params are unavailable on old Nginx version. But this role do _not_ put it if your version is too old!

Upstream params
---------------

- `name`: upstream name. Can be use in vhost with *proxy_pass http://upstream_name*
- `params`: list of param (hash, zone...)
- `servers`: each upstream MUST have at least 1 server

Server params
-------------

You must set a `path`. For example: *192.168.0.50:8080* or *unix:/tmp/my.sock*.

All this params are optional. You should see [Nginx upstream doc](http://nginx.org/en/docs/http/ngx_http_upstream_module.html).

- `weight`
- `max_fails`
- `fail_timeout`
- `backup`
- `down`
- `route`
- `slow`start`