[rdo-list] tripleo ha topology

[Dotan, Alon]

So if understood correctly HAproxy is basically a component in pcs?


-----Original Message-----
From: Raoul Scarazzini [mailto:rasca at redhat.com] 
Sent: Thursday, December 15, 2016 10:33 AM
To: Dotan, Alon <alon.dotan at hpe.com>; rdo-list at redhat.com
Subject: Re: [rdo-list] tripleo ha topology

On 14/12/2016 22:59, Dotan, Alon wrote:
> Hey,
> Some can provide link or explanation about the use of haproxy and 
> pacemaker together in tripleo?
> Why need pcs if there is galera and haproxy?

Galera is managed via a specific resource agent which takes care of all the stuff needed to start, stop and, most of all, recover. It automates a lot of tasks which otherwise will be manual.

Haproxy is managed by Pacemaker because of the Vips. There are specific constraints that ensures that whether a Vip change the host, haproxy service will follow.

Hope this helps,

--
Raoul Scarazzini
rasca at redhat.com