Relation's need config too

[Tom Haddon]

On 23/07/12 23:58, Clint Byrum wrote:
> Excerpts from Robert Collins's message of 2012-07-23 12:37:33 -0700:
>> On Tue, Jul 24, 2012 at 5:14 AM, Clint Byrum <clint at ubuntu.com> wrote:
>>> This is comes up a lot, and relates to the need for juju to have simple
>>> leader election support:
>>
>> I can see how using elections would approximate the same
>> configuration.... However we don't do elections at all at the moment.
>> I suspect we'd be entirely happy just telling the two haproxies that
>> they are cooperating and that one is master.
>>
>> Tom, might help to attach a trimmed & anonymised
>> haproxy-{nutmeg,banana} config here - it would make it crystal clear
>> what we do :)
> 
> Yes something concrete would help. There's no mention of the word
> 'master' here:

Hopefully this helps:

http://paste.ubuntu.com/1107983/

Basically we have two haproxy instances, both send traffic to the
"lpnet-frontend" listen stanza locally, which then sends traffic to the
actual application servers via the "lpnet-app" listen stanza. The key
config word here is "backup" on the server line in the "lpnet-frontend"
listen stanza.

> http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
> 
> Nor is there a 'slave', or 'peer'. All the "High Availability with
> haproxy" tutorials I see suggest floating IPs for the HA in HAProxy,
> and even their logo does not have any lines between the H and the A. So
> its hard to understand how they can be informed of one another or work
> together at all.
>